JP5171868B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus. In particular, the present invention relates to an apparatus capable of performing a chasing operation such as hot water in a bathtub using hot water in a hot water tank as a heat source.

  For example, in a hot water storage type hot water supply apparatus that stores hot water (hot water or water) boiled in advance by a heating means in a hot water storage tank and supplies hot water from the hot water storage tank, it is possible to carry out a chasing operation. Yes (see, for example, Patent Document 1). In the apparatus of Patent Document 1, when performing the chasing operation, the hot water in the upper part of the hot water supply tank and the bath water in the bathtub are heat-exchanged by the chasing heat exchanger to heat the bath water and heat exchange. Due to this, medium temperature water whose temperature has been lowered (water whose temperature is lower than the high temperature water in the upper part of the tank and higher in temperature than the low temperature water stored in the lower part of the tank by water supply or the like) is returned to the lower part of the hot water supply tank.

JP 2004-125306 A

  As described above, by flowing a large amount of medium temperature water whose temperature has decreased due to heat exchange into the hot water supply tank, for example, the temperature stratification formed by the difference in density between the high temperature water and the low temperature water in the hot water tank changes. Arise. Therefore, the temperature distribution of the hot water in the hot water supply tank changes, and the efficiency decreases, for example, the temperature of the hot water in the upper part of the hot water supply tank relating to the hot water decreases and the amount of ineffective heat increases.

In particular, when water is heated by a refrigeration cycle circuit to generate high-temperature water, in general, the lower the temperature of the water flowing into the heat exchanger, the greater the amount of heat related to heat exchange, so the higher the operating efficiency, the higher the operation. Efficiency is reduced. In particular, when carbon dioxide (CO ₂ ) is used as the refrigerant in the refrigeration cycle circuit, this feature becomes significant. In the conventional device, the medium temperature water whose temperature has decreased due to the heat exchange in the follow-up heat exchanger is returned to the lower part of the hot water supply tank, so it is mixed with the low temperature water present in the lower part of the hot water tank, The temperature of the water was rising during the follow-up operation. Therefore, when the boiling operation is performed in which the low temperature water in the lower part of the hot water tank is heated by the refrigeration cycle and the hot water flows from the upper part of the hot water tank, the operating efficiency of the refrigeration cycle circuit decreases as the temperature of the low temperature water at the lower part of the hot water tank increases. However, there has been a problem that the operating efficiency of the apparatus is lowered.

  The present invention has been made to solve the above-described problems, and can reduce the amount of medium-temperature water flowing into the central portion and the lower portion of the hot water supply tank during the follow-up operation, thereby enabling efficient operation. It aims at obtaining a hot water storage type hot water supply apparatus.

  A hot water storage type hot water supply apparatus according to the present invention includes a hot water supply tank for storing hot water, heating means for heating the hot water in the hot water supply tank, and a follow-up heat exchanger that heats the heated medium by exchanging heat with the hot water in the hot water tank. A chasing circuit is formed in which part or all of hot water in the hot water tank that has passed through the chasing heat exchanger is combined with hot water heated by the heating means and flows from the upper portion of the hot water tank.

  According to the present invention, the hot water whose temperature has been lowered by heating the medium to be heated in the follow-up heat exchanger is joined with the hot water heated by the heating means and flows from the upper part of the hot water tank. It is not necessary to flow a large amount of hot and cold water into the central part and the lower part of the water. Therefore, it is possible to maintain the efficiency without changing the temperature distribution of the hot water in the hot water tank and without lowering the temperature related to the hot water. In particular, when hot water is heated using a refrigeration cycle circuit, it is possible to avoid a decrease in operating efficiency by suppressing a rise in the temperature of the low-temperature water in the lower portion, thereby realizing a highly efficient operation.

The block diagram of the hot water storage type hot-water supply apparatus of Embodiment 1 of this invention. The figure showing the control processing of the chasing operation of the hot water storage type hot water supply apparatus concerning Embodiment 1. FIG. The block diagram of another hot water storage type hot-water supply apparatus of Embodiment 1 of this invention. It is a figure showing the operation | movement etc. of the apparatus in "heat pump hot water storage follow-up mode." It is a figure showing operation | movement etc. of the apparatus of "heat pump chasing + hot-water supply mode". It is a figure showing the operation | movement etc. of the apparatus in "chasing + hot-water supply mode". It is a figure showing the operation | movement etc. of the apparatus in "tracking mode". It is a figure which shows the relationship of operation mode transition, the presence or absence of hot water, and the chasing ability. It is a figure showing the structure of the hot water storage type hot water supply apparatus which concerns on Embodiment 5. FIG. It is a figure showing the structure of the hot water storage type hot water supply apparatus which concerns on Embodiment 6. FIG.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration centering on a hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. Based on FIG. 1, the structure of the hot water storage type hot water supply apparatus according to the present invention will be described. The hot water storage type hot water supply apparatus of FIG. 1 includes a heat pump unit 1 and a tank unit 2. In the heat pump unit 1, a compressor 3, a water refrigerant heat exchanger 4 as a radiator, an expansion valve 5, and an air heat exchanger 6 as an evaporator are mounted. And the compressor 3, the water refrigerant | coolant heat exchanger 4, the expansion valve 5, and the air heat exchanger 6 are pipe-connected annularly, and a refrigeration cycle circuit (refrigerant circuit) is comprised.

  The compressor 3 is a variable capacity compressor having an inverter circuit that can change the capacity (the amount of delivery per unit time) by arbitrarily changing the drive frequency, for example. The water-refrigerant heat exchanger 4 is a plate-type or double-tube type heat exchanger, and performs heat exchange between the refrigerant flowing in and water (low-temperature water). By heat exchange in the water-refrigerant heat exchanger 4, the refrigerant dissipates heat and the water absorbs heat. The expansion valve 5 is an electronic expansion valve whose opening degree is variable. The air heat exchanger 6 exchanges heat between the outside air flowing through the fan 6A and the refrigerant. The refrigerant absorbs heat and the outside air radiates heat by heat exchange in the air heat exchanger 6.

  On the other hand, a hot water supply tank 7 for storing hot water, pumps 8a, 8b and 8c, a follow-up heat exchanger 9 and a three-way valve (three-way flow control valve) 10 are mounted in the tank unit 2. In addition, a measurement control device 14b that performs measurement, control processing, and the like related to the tank unit 2 is mounted. In the present embodiment, the pumps 8a, 8b, and 8c have inverter circuits, and the capacity can be varied depending on the driving rotational speed.

  Here, in the tank unit 2, starting from the lower part of the hot water supply tank 7 and returning to the upper part of the hot water supply tank 7 through the boiling (heating) pump 8 a and the water / refrigerant heat exchanger 4, the heat pump unit 1, the tank A boiling circuit A is configured so that hot water circulates through the unit 2. Further, a tracking circuit B is configured. The chasing circuit B starts from the upper part of the hot water supply tank 7, reaches the chasing heat exchanger 9, the chasing pump 8 b, and the three-way valve 10, and is branched by the three-way valve 10. One of the branched hot water returns to the hot water supply tank 7 from the middle hot water inflow portion provided in the central portion of the hot water supply tank 7, and the other joins the high temperature water boiled in the boiling circuit A to supply hot water from the top. The configuration returns to the tank 7.

  A hot water supply pipe 20 and a water supply pipe 21 are connected to the hot water supply tank 7. Water is supplied from the lower part of the hot water supply tank 7 through the water supply pipe 21, and various hot water supply uses such as filling the bathtub 11 with the hot water supply pipe 20. The hot water is discharged from the hot water supply tank 7. In addition, in order to follow up the bathtub water (heated medium) of the bathtub 11, a bathtub circulation circuit C that circulates the bathtub water in the bathtub 11, the pump 8 c for the bathtub water (heated medium), and the follow-up heat exchanger 9 is provided. Composed.

  In the heat pump unit 1, pressure sensors 12a and 12b are arranged on the discharge side and the suction side of the compressor 3, and signals that detect the refrigerant pressure at the arrangement location are transmitted to the measurement control device 14a. Further, temperature sensors 13a and 13b are arranged on the discharge side and the suction side of the compressor 3, and signals that detect the refrigerant temperature at the arrangement location are transmitted to the measurement control device 14a.

  Further, the tank unit 2 includes a temperature sensor 13c on the outlet side of the water refrigerant heat exchanger of the boiling circuit A, a temperature sensor 13d on the downstream side of the junction of the boiling circuit A and the follower circuit B, and a temperature sensor 13k on the bathtub. 11 is provided on the downstream side of the follow-up heat exchanger 9 in the hot water circulation circuit. Each detects the water temperature of an arrangement place, and transmits a signal to measurement control device 14b. Further, temperature sensors 13e to 13j are provided from the upper part to the lower part in the height direction of the hot water supply tank 7, and transmit a signal that detects the water temperature at each installed position (height) to the measurement control device 14b.

  The measurement control device 14a in the heat pump unit 1 includes data relating to detection (measurement) of the pressure sensors 12a and 12b and the temperature sensors 13a and 13b, and the operation content instructed from the device user via an input means (not shown). Based on the above, the control processing of each means (actuator) of the heat pump unit 1 (refrigeration cycle circuit) such as the operation of the compressor 3, the opening degree of the expansion valve 5 and the fan air blowing amount of the air heat exchanger 6 is performed.

  In addition, the measurement control device 14b in the tank unit 2 operates the pumps 8a, 8b, and 8c based on the data related to the measurement (detection) of the temperature sensors 13c to 13k, the operation content instructed by the device user, Each means in the tank unit 2 such as the opening degree of the three-way valve 10 is controlled. Here, it is assumed that the measurement control device 14a and the measurement control device 14b can communicate signals including data and the like. Here, the measurement control device 14a and the measurement control device 14b are configured separately, but the measurement control in the heat pump unit 1 and the tank unit 2 may be performed by a single device.

  Next, the operation | movement operation | movement of the hot water storage type hot-water supply apparatus in this Embodiment is demonstrated. In this apparatus, a boiling operation for storing hot water in the hot water tank 7, a hot water operation for discharging hot water in the hot water tank 7 as a load, hot water in the hot water tank 7 as a heat source, and a heated medium. The chasing operation for heating the bathtub water in a certain bathtub 11 can be performed.

  First, the operation of the boiling operation will be described. In the refrigeration cycle circuit during the boiling operation, the measurement control device 14a in the heat pump unit 1 drives the compressor 3 and the fan 6A of the air heat exchanger 6. The high-temperature and high-pressure gas refrigerant boosted by the compressor 3 flows into the water-refrigerant heat exchanger 4. The refrigerant flowing into the water-refrigerant heat exchanger 4 is cooled by heat dissipation while heating the low-temperature water by heat exchange, and becomes a high-pressure and low-temperature refrigerant. Thereafter, the refrigerant is depressurized by the expansion valve 5 to become a low-pressure gas-liquid two-phase refrigerant, exchanges heat with the outside air in the air heat exchanger 6, absorbs heat, evaporates, becomes low-pressure low-temperature gas, and again becomes the compressor 3 Inhaled.

  On the other hand, the measurement control device 14 b in the tank unit 2 drives the pump 8 a to convey the low-temperature water in the lower part of the hot water supply tank 7 to the water-refrigerant heat exchanger 4. In the water / refrigerant heat exchanger 4, the low-temperature water is heated by heat exchange with the refrigerant, is generated as high-temperature water, and is returned to the upper part of the hot water supply tank 7. Here, in the hot water supply tank 7, high temperature water stays in the upper portion and low temperature water stays in the lower portion to form a temperature stratification, and a temperature boundary layer is generated between the high temperature water and the low temperature water. As the boiling operation proceeds, the ratio of the low-temperature water decreases and the ratio of the high-temperature water increases, so that the temperature boundary layer moves to the lower part of the hot water supply tank 7.

  When the boiling operation is performed, a target value of the hot water storage temperature in the hot water supply tank 7 is set by the apparatus user. The measurement control devices 14a and 14b perform operation control according to the target value of the hot water storage temperature. Here, the hot water storage temperature is set in a range in which 65 ° C. is the lower limit and 90 ° C. is the upper limit in order to avoid the propagation of Legionella, taking into account the amount of hot water discharged from the hot water pipe 20. In the measurement control device 14b in the tank unit 2, the temperature of the hot water at the outlet of the water / refrigerant heat exchanger 4 detected by the temperature sensor 13c (or 13d) becomes the target value of the hot water storage temperature for the flow rate of water conveyed by the pump 8a. Control the flow rate as follows. For example, when the temperature of the hot water at the outlet of the water-refrigerant heat exchanger 4 is lower than the target value, the capacity of the pump 8a is controlled to be low so that the flow rate of water conveyed by the pump 8a is reduced. On the contrary, when the temperature of the hot water at the outlet of the water refrigerant heat exchanger 4 is higher than the target value of the hot water storage temperature, the capacity of the pump 8a is controlled to be high so that the flow rate of water conveyed by the pump 8a is increased.

  In the heat pump unit 1, the measurement control device 14a controls the capacity of the compressor 3 and the opening degree of the expansion valve 5 in accordance with the target value of the hot water storage temperature. The capacity control of the compressor 3 is controlled such that the pressure on the discharge side of the compressor 3 which is the high pressure side in the refrigerant circuit becomes a pressure target value set according to the target value of the hot water storage temperature. For this reason, when the pressure detected by the pressure sensor 12a is lower than the pressure target value, the capacity of the compressor 3 is controlled to be high. When the pressure detected by the pressure sensor 12a is higher than the pressure target value, the capacity of the compressor 3 is controlled to be low. Moreover, the opening degree control of the expansion valve 5 is controlled so that the temperature on the discharge side of the compressor 3, which is the high temperature side in the refrigerant circuit, becomes a temperature target value set according to the target value of the hot water storage temperature. For this reason, when the temperature which the temperature sensor 13a detects is lower than the temperature target value, control is performed to reduce the opening degree of the expansion valve 5. When the temperature related to detection by the temperature sensor 13a is higher than the temperature target value, control is performed to increase the opening of the expansion valve 5.

  Next, the operation of the hot water operation will be described. In the hot water operation, hot water stored in the hot water supply tank 7 is supplied from the hot water pipe 20. At this time, low-temperature water such as tap water flows from the water supply pipe 21 so that the amount of water stored in the hot water supply tank 7 is kept constant. Thus, when the hot water operation is performed, the temperature boundary layer formed between the low temperature water and the high temperature water in the hot water tank 7 moves to the upper part of the hot water tank 7 according to the amount of hot water.

  Next, the operation of the chasing operation will be described. In the chasing operation, the pumps 8b and 8c are driven, and the hot water in the hot water supply tank 7 is used as a heat source to heat the bath water in the bathtub 11 that is a medium to be heated. Further, during the follow-up operation, the pump 8a and the compressor 3 are also driven to perform the above-described boiling operation.

  Here, the heating operation of hot water in the bathtub 11 that is a medium to be heated will be described focusing on the flow of hot water in the chase circuit B and the bathtub circulation circuit C. The measurement control device 14b drives the pump 8b. When the pump 8b is driven, the high-temperature water at the upper part of the hot water supply tank 7 is driven and flows into the heat exchanger 9. Further, the measurement control device 14b drives the pump 8c. By driving the pump 8c, the bathtub water also flows and flows into the heat exchanger 9. The high-temperature water that has flowed from the upper part of the hot water supply tank 7 into the follow-up heat exchanger 9 exchanges heat with the bath water and dissipates heat, and the temperature drops to medium-temperature water. On the other hand, the bath water absorbs heat and rises in temperature. For example, when the temperature of the hot water from the hot water tank 7 is 65 ° C. and the temperature of the bathtub water from the bathtub 11 is 30 ° C., the temperature of the hot water from the hot water tank 7 drops from 65 ° C. to 45 ° C. Water rises from 30 ° C to 40 ° C.

  The medium-temperature water whose temperature has decreased in the follow-up heat exchanger 9 is bifurcated by the three-way valve 10 via the pump 8b. One of the branched warm water is returned to the hot water supply tank 7 from the warm water inflow portion. The other medium temperature water merges with the high temperature water generated in the boiling operation, and is returned to the upper part of the hot water supply tank 7.

  FIG. 2 is a diagram illustrating the control performed by the measurement control devices 14a and 14b during the follow-up operation. A control process performed during the follow-up operation will be described with reference to FIG. First, the measurement control devices 14a and 14b set a target temperature (step S1). Here, for example, in the above-described boiling operation, the apparatus user has set, but in the follow-up operation, the target value of the hot water storage temperature is determined by the hot water in the upper part of the hot water supply tank 7 according to the detection of the temperature sensor 13e. The measurement control device 14b sets so as to be higher than the temperature. Basically, the maximum temperature at which the heat pump unit 1 can boil, for example, 90 ° C. is set. Moreover, about the target value of tracking temperature (temperature of bathtub water), it sets based on the temperature which the apparatus user determined. Here, the temperature determined by the user of the apparatus is set as the target value of the tracking temperature.

  Next, the measurement control devices 14a and 14b perform initial setting of each unit that is operated during the follow-up operation (step S2). For example, the measurement control device 14a initializes the capacity of the compressor 3 and the opening degree of the expansion valve 5 based on the target value of the hot water storage temperature. Further, the measurement control device 14b sets the capacities of the pumps 8a, 8b and 8c and the opening degree of the three-way valve 10 based on the target value of the hot water storage temperature and the target value of the follow-up temperature. Then, each means is caused to perform the chasing operation described above (step S3).

  When it is determined that the predetermined time has elapsed (step S4), the boiling operation control by the measurement control devices 14a and 14b is set to the set hot water storage temperature target value as in the case of the above-described boiling operation alone. Based on this, processing is performed (step S5). At this time, the measurement control device 14a controls the capacity of the compressor 3 so that the pressure on the discharge side of the compressor 3 becomes a pressure target value corresponding to the target value of the hot water storage temperature. And the opening degree of the expansion valve 5 is controlled so that the temperature on the discharge side of the compressor 3 which is the high temperature side in the refrigeration cycle circuit becomes the temperature target value corresponding to the target value of the hot water storage temperature. Further, the measurement control device 14b controls the flow rate so that the temperature of the hot water at the outlet of the water refrigerant heat exchanger 4 detected by the temperature sensor 13c becomes the target value of the hot water storage temperature with respect to the flow rate of water conveyed by the pump 8a. The pump 8b controls the capacity so that a predetermined transfer flow rate can be obtained.

  Further, for the pump 8c, the measurement control device 14b compares the temperature of the bathtub water heated by the tracking heat exchanger 9 detected by the temperature sensor 13k with the target value of the tracking temperature, so that the temperature of the bathtub water is It is determined whether or not the target temperature of the tracking temperature is the same (step S6). If the temperature of the bath water is the target value of the follow-up temperature, the capacity of the pump 8c is left as it is. On the other hand, if it is determined that the temperature of the bath water is higher than the target value (step S7), the capacity of the pump 8c is increased (step S8), and the temperature of the bath water is lower than the target value (the temperature of the bath water is lower). If it is determined that it is not higher than the target value), the capacity of the pump 8c is decreased (step S9).

  Further, the measurement control device 14b controls the opening degree of the three-way valve 10 and the temperature of the hot water returned to the upper part of the hot water tank 7 related to the detection of the temperature sensor 13d and the high temperature of the upper part of the hot water tank 7 detected by the temperature sensor 13e. The temperature of the water is compared, and it is determined whether or not the temperature of the joined hot water is the same as the temperature of the hot water in the upper part of the hot water supply tank 7 (step S10). If the temperature of the joined hot water is the temperature of the hot water in the upper part of the hot water supply tank 7, the opening degree of the three-way valve 10 is left as it is. On the other hand, when it is determined that the temperature of the combined hot water is higher than the temperature of the hot water in the upper part of the hot water tank 7 (step S11), the amount of medium hot water returned from the upper part of the hot water tank 7 is increased, so Allow the temperature to drop. Therefore, the opening degree of the three-way valve 10 is controlled so that the opening degree of the flow path returning to the upper part of the hot water supply tank 7 is increased (the opening degree of the flow path returning to the hot water inflow portion in the hot water supply tank 7 is reduced). (Step S12). Conversely, when the temperature of the joined hot water is lower than the temperature of the hot water at the upper part of the hot water tank 7 (determined that the temperature of the joined hot water is not higher than the temperature of the hot water), the amount returned from the upper part of the hot water tank 7 Reduce the temperature of the medium temperature water so that the temperature of the combined hot water will rise. Therefore, the opening degree of the three-way valve 10 is controlled so that the opening degree of the flow path returning to the upper part of the hot water supply tank 7 is reduced (the opening degree of the flow path returning to the hot water inflow portion in the hot water supply tank 7 is increased). (Step S13). Then, returning to step S4, the above operation is repeated every time a predetermined time elapses. Here, in the present embodiment, in step S10, it is determined whether or not the temperature of the joined hot water is the same as the temperature of the hot water in the upper part of the hot water supply tank 7, thereby returning from the upper part of the hot water supply tank 7. Although the amount of medium temperature water is increased, it is not limited to this. For example, in order to avoid the temperature of the joined hot water from lowering the temperature of the hot water, it may be determined whether the temperature of the joined hot water is equal to or higher than the temperature of the hot water in the upper part of the hot water supply tank 7.

  Next, the temperature situation related to the hot water supply tank 7 during the chasing operation will be described. As described above, the hot water in the upper part of the hot water supply tank 7 dissipates heat in the follow-up heat exchanger 9 and the temperature is lowered to become medium hot water. At this time, the temperature of the intermediate temperature water is close to the temperature of the bath water, so that the temperature is lower than the high temperature water stored in the upper part of the hot water supply tank 7 and higher than the low temperature water in the lower part of the hot water supply tank 7. When this medium-temperature water flows in from the medium-temperature water inflow portion of the hot water supply tank 7 as it is, the following effects are brought about.

  First, when there is high-temperature water in the intermediate temperature water inflow portion of the hot water supply tank 7, the temperature of the hot water at that location is lowered by mixing with the inflowing intermediate temperature water. Here, the temperature of the hot water in the hot water supply tank 7 decreases as the time for storing the hot water increases, but when the temperature falls below the temperature of high temperature water used for hot water supply, for example, 42 ° C., the heat of the hot water is used for hot water supply. It becomes the amount of ineffective heat that cannot be done. For this reason, lowering the temperature of the hot water in the hot water supply tank 7 causes an increase in the amount of hot water that becomes ineffective, and an extra operation is performed during the boiling operation, thereby reducing the operating efficiency of the apparatus. End up.

  Moreover, when there is low-temperature water in the hot water inflow section of the hot water supply tank 7, the hot water temperature at that location rises by mixing with the inflowing warm water. The temperature of the low-temperature water at the bottom of the hot water tank 7 is later raised by the boiling operation. At this time, the lower the temperature of the low-temperature water flowing into the water-refrigerant heat exchanger 4 is, the easier it is to heat. Driving efficiency increases. On the other hand, raising the temperature of the low temperature water in the lower part of the hot water supply tank 7 by mixing with the medium temperature water brings about a reduction in the operating efficiency of the refrigeration cycle circuit, thereby reducing the operating efficiency of the apparatus.

  In addition, it is possible to maintain the temperature stratification formed so that the high temperature water stays in the upper part of the hot water tank 7 and the low temperature water stays in the lower part as much as possible. This is desirable in order to avoid an increase in temperature. Thermal stratification has a large difference in water temperature between the upper and lower sides, and the density of hot water is low, and it becomes easier to maintain when the density of low-temperature water is high, but when medium-temperature water is mixed as described above, the difference in density between the upper and lower sides is reduced. Therefore, mixing of high temperature water and low temperature water is promoted. Therefore, temperature mixing in the hot water supply tank 7 is promoted, the amount of ineffective heat is increased, and the efficiency during the boiling operation is reduced, so that the operation efficiency of the apparatus is lowered.

  Therefore, in the present invention, the tracking circuit B is configured so that a part of the medium-temperature water generated by the tracking heat exchanger 9 is returned from the upper part of the hot water supply tank 7 in which the hottest water is stored. When returning the medium temperature water to the upper part of the hot water tank 7, a part of the medium temperature water branched by the three-way valve 10 and the hot water heated in the boiling operation are merged, and the temperature of the merged hot water is at the upper part of the hot water tank 7. It is made to return to the upper part of the hot water supply tank 7 in a state higher than the temperature of the hot water. Since the temperature of the medium temperature water is lower than the temperature of the hot water in the upper part of the hot water tank 7, the target value of the temperature of the hot water generated in the boiling operation is higher than the temperature of the hot water in the upper part of the hot water tank 7 as described above. Set to be higher. For example, when the temperature of the high temperature water related to detection by the temperature sensor 13e is 65 ° C. and the temperature of the medium temperature water is 45 ° C., the temperature of the high temperature water generated in the boiling operation is set to 90 ° C. And hot water generated by boiling operation are combined so that the temperature of the hot water is 65 ° C. or higher.

  As described above, according to the hot water storage type hot water supply apparatus of the first embodiment, in the follow-up operation, in the follow-up heat exchanger 9, the medium-temperature water generated by heat exchange with the aquarium water that is the heating medium is Since the hot water merged from the upper part of the hot water supply tank 7 is made to flow by being branched by the three-way valve 10 and joined with the boiled high temperature water, it is possible to avoid a large amount of medium temperature water from flowing in from the intermediate temperature water inflow portion. Accordingly, temperature stratification in the hot water supply tank 7 can be maintained, and a decrease in the temperature of the hot water in the hot water supply tank 7 can be avoided, so that the operating efficiency of the apparatus can be maintained high. In addition, since the amount of medium temperature water flowing into the hot water supply tank 7 from the intermediate temperature water inflow portion can be suppressed, mixing of the medium temperature water and the hot water in the hot water supply tank 7 can be suppressed. For this reason, an increase in the amount of reactive heat and a decrease in efficiency during the boiling operation can be avoided, and the operating efficiency of the apparatus can be maintained higher. In particular, in the apparatus of the present embodiment, boiling is performed by the refrigeration cycle circuit, but heat exchange can be efficiently performed by keeping the lower part of the hot water tank 7 at low temperature water, so that the operation efficiency is further improved. be able to.

  In addition, the smaller the amount of intermediate warm water returned from the intermediate warm water inflow portion to the hot water supply tank 7, the lower the efficiency reduction due to the above-described intermediate warm water mixing in the hot water supply tank 7. In addition, the larger the temperature difference between the temperature of the hot water generated in the boiling operation and the temperature of the hot water in the upper part of the hot water tank 7, the higher the temperature of the hot water that has been joined, The temperature of the upper hot water can be prevented from becoming lower. Therefore, in this embodiment, the target value of the hot water storage temperature in the boiling operation is set as high as possible, for example, as described above, such as 90 ° C., which is the maximum temperature that can be heated by the heat pump unit 1. As a result, it can be returned to the upper part of the hot water supply tank 7 by joining with more medium temperature water.

  The temperature of the joined hot water is not lowered below the temperature of the hot water in the upper part of the hot water tank 7, and the amount of intermediate hot water returned to the upper part of the hot water tank 7 is returned as much as possible. It is possible to avoid a decrease in efficiency during the boiling operation. At this time, as in the present embodiment, the three-way valve 10 is provided, and the measurement control device 14b performs opening degree control, so that an appropriate amount of medium-temperature water can be always distributed, and the operation efficiency of the device is increased. Can be maintained.

Embodiment 2. FIG.
FIG. 3 is a diagram showing a configuration of a hot water storage type hot water supply apparatus according to Embodiment 2 of the present invention. In FIG. 3, means and the like having the same reference numerals as those in FIG. 1 perform the same operations as those described in the first embodiment. In FIG. 1, the hot water circulating through the tracking circuit B and the boiling circuit A is joined and returned from the upper part of the hot water supply tank 7. In FIG. 3, the inlets 30 and 31 may be provided independently in the vicinity of the upper part of the hot water tank 7, and each may flow independently into the hot water tank 7. In this case, since the hot water generated in the boiling operation is mixed with the hot water immediately after flowing into the hot water supply tank 7, the same effect as in the case of FIG. 1 can be obtained, and a highly efficient apparatus can be obtained. Can do.

Embodiment 3 FIG.
In the above-described embodiment, the three-way valve 10 is provided, the opening degree is controlled, and the medium temperature water returned from the upper part of the hot water tank 7 and the medium temperature water city returned from the intermediate temperature water inflow portion are branched. Here, for example, when the boiling capacity in the heat pump unit 1 is larger than the hot water supply load required for the follow-up operation, the temperature of the hot water that has been merged and the like is maintained even if the entire amount of the medium-temperature water is returned from the upper part of the hot water supply tank 7. The temperature of the hot water in the upper part of the tank 7 can be set. In such a case, the intermediate warm water may be entirely returned from the upper part of the hot water supply tank 7 without providing the three-way valve 10.

  Further, in the above-described first embodiment, etc., it has been described that the target value of the hot water storage temperature is set high so that the temperature of the hot water in the upper part of the hot water supply tank 7 can be maintained even when combined with the medium temperature water. . Here, for example, even if the entire amount of medium-temperature water is returned to the upper part of the hot water supply tank 7, the temperature of the combined hot water may be higher than the temperature of the hot water in the upper part of the hot water tank 7. In such a case, the target value of the hot water storage temperature is set too high. Therefore, even if the hot water storage temperature target value is set high, in the case described above, for example, the measurement control device 14b may perform control processing to lower the hot water storage temperature target value. By performing such operation control, the operation efficiency of the boiling operation during the follow-up operation can be increased, and a device with higher operation efficiency can be obtained.

Embodiment 4 FIG.
4-7 is a figure showing the structure of the hot water storage type hot water supply apparatus which concerns on Embodiment 4 of this invention. 4 to 7, the same reference numerals as those in FIG. 1 and the like perform the same operations as those described in the first embodiment.

  The hot water storage type hot water supply apparatus shown in FIGS. 4 to 7 is cooled by heat dissipation by exchanging the hot water boiled by the heat pump unit 1 with the bath water in the follow-up heat exchanger 9 and then returned to the hot water tank 7. It has a simple water circuit configuration. Here, if the return temperature of the hot water returning to the hot water supply tank 7 is set to about the temperature of the hot water in the upper part of the hot water supply tank 7, it is possible to simultaneously perform the chasing and the hot water storage without cooling the hot water in the upper part of the hot water supply tank 7. It becomes. Further, if the operation is performed so that the temperature of the hot water returning to the upper part of the hot water supply tank 7 is lowered to the vicinity of the lower temperature limit effective as hot water (for example, 45 ° C. or the like), the chasing ability can be further increased. In this case, in addition to the hot water boiled by the heat pump unit 1, the hot water in the upper part of the hot water supply tank 7 is also used, so that more high-temperature water can be chased and supplied to the heat exchanger 9. It becomes possible and can increase the chasing ability.

"Equipment configuration"
Next, a detailed configuration of the hot water storage type hot water supply apparatus of the present embodiment will be described. In the present embodiment, the tapping pipe 20 is connected to the piping on the chase circuit B. Then, a part of the follow-up circuit B is used as a hot water flow path when hot water is supplied from the boiling circuit A to the hot water discharge pipe 20. As a result, for example, the hot water after heat exchange in the follow-up heat exchanger 9 for performing follow-up on the bathtub water in the bathtub 11 can be discharged from the hot water discharge pipe 20. Further, an electromagnetic valve 33a serving as a switching means (open / close valve) for controlling whether or not the hot water flowing through the chase circuit B flows to the hot water supply tank 7 side is provided in the pipe E serving as a flow path on the hot water supply tank 7 side. . Further, the mixing valves 32a and 32b are configured to supply hot water that has passed through the hot water pipe 20 and hot water from the water supply pipe 21 based on a hot water set temperature (for example, 42 ° C., a temperature set by a user using a remote controller (not shown), etc.). It is a valve for mixing. The mixed hot and cold water is supplied to the bathtub 11 and the mixing plug 34 (connected to a shower, a faucet, etc.) according to the user's request. By opening the solenoid valve 33b to the bathtub 11, the hot water is finally discharged from the mixing plug 34 by the user's faucet opening operation.

  Here, in FIG. 4, the description of the heat pump components in the heat pump unit 1 described in FIG. 1 is omitted, but the hot water storage type hot water supply apparatus in FIG. The same operation as described in 1 etc. can be realized. Further, in the hot water storage type hot water supply apparatus of the present embodiment, the hot water passing through the follow-up heat exchanger 9 returns to the upper part of the hot water supply tank 7 via the pipe E. For this reason, a baffle plate (not shown) for diffusing the hot water jet flowing into the hot water tank 7 in the horizontal direction is provided on the upper side of the hot water tank 7 to which the pipe E is connected. Thereby, even when a temperature boundary layer (boundary portion of high temperature water and low temperature water) exists in the upper portion of the hot water supply tank 7, the temperature boundary layer is stirred by the jet of hot water and the high temperature water portion is mixed with the low temperature water portion. The inconvenience that the hot water portion disappears can be avoided. Moreover, in this Embodiment, it has the temperature sensors 13m-13p further. Furthermore, it has flow sensor 40a-40c, and has detected the flow volume of water.

<Operation "Heat pump hot water storage mode">>
FIG. 4 is a diagram illustrating the operation of the apparatus in the “heat pump hot water storage and pouring mode” and the flow of water in the hot water storage type hot water supply apparatus that can simultaneously perform the operation for chasing and hot water storage. The operation control of the present embodiment is performed by the measurement control device 14b and the like (hereinafter the same) as in the above embodiment. Hot water (high temperature water) generated by the boiling operation in the heat pump unit 1 and hot water (high temperature water) in the upper part of the hot water supply tank 7 are mixed and flow into the follow-up heat exchanger 9. In the follow-up heat exchanger 9, heat exchange between the hot water that has flowed in and the bathtub water in the bathtub 11 related to the circulation of the pump 8 c is performed. As a result, the temperature of the bath water rises and the chasing is performed. On the other hand, the hot water radiated (cooled) by heat exchange of the follow-up heat exchanger 9 flows into the upper part of the hot water supply tank 7 through the pump 8b and the open electromagnetic valve 33a. Here, the flow rate of hot water flowing through the boiling circuit A is adjusted by the pump 8a, and the flow rate of the follow-up circuit B is adjusted by the pump 8b. At this time, the pump 8a is driven and controlled so that the boiling temperature of the heat pump unit 1 (temperature related to detection by the temperature sensor 13c) matches the target value. Further, the pump 8b is driven and controlled so that the temperature of hot water returning to the hot water supply tank 7 (the temperature related to the detection of the temperature sensor 13m) matches the target value.

《Effect `` Heat pump hot water storage mode ''》
For example, when the temperature of the hot water in the upper part of the hot water supply tank 7 is 65 ° C., the temperature of the hot water related to the boiling of the heat pump unit 1 is set to 75 ° C. Then, by setting the temperature of hot water returning to the hot water supply tank 7 (temperature related to detection by the temperature sensor 13m) to 65 ° C., the heat of 10 ° C. that is the difference between 75 ° C. and 65 ° C. Hot water is supplied to the hot water supply tank 7 at a temperature of 65 ° C., which is the same as the hot water storage temperature. As a result, it is possible to carry out the operation simultaneously with the hot water storage that returns the hot water to the hot water supply tank 7 while keeping the temperature without generating the intermediate hot water. Here, since the temperature difference is 10 ° C. as described above, the follow-up ability is not large, but the temperature is automatically raised when the temperature of the bathtub 11 is lowered, and the heat retention at a predetermined temperature is maintained. Suitable for automatic heat insulation operation that does not require large chasing ability. As described above, in the operation mode as shown in FIG. 4, since intermediate temperature water is not generated in the hot water tank 7, it is possible to prevent the heat pump operation efficiency from being lowered due to boiling of the intermediate temperature water. It is possible to improve the operating efficiency of the hot water supply system such as Idaki.

<< Operation "Heat pump chasing + Hot water supply mode">>
FIG. 5 is a diagram showing the operation of the apparatus and the flow of water in the hot water storage type hot water supply apparatus in the “heat pump follow-up + hot water supply mode” that can simultaneously perform the operation using the heat pump and the hot water supply. It is. Hot water (high temperature water) generated by the boiling operation in the heat pump unit 1 and hot water (high temperature water) in the upper part of the hot water supply tank 7 are mixed and flow into the follow-up heat exchanger 9. In the follow-up heat exchanger 9, heat exchange between hot water on the follow-up circuit B side and bathtub water which is hot water on the bathtub circulation circuit C side by the pump 8c is performed. As a result, the temperature of the bath water rises and the chasing is performed. On the other hand, the hot water on the side of the follower circuit B radiated (cooled) by the heat exchange of the follower heat exchanger 9 is discharged to the hot water terminal via the pump 8b and the mixing valve 32. In FIG. 5, the hot water is discharged to the mixing plug 34 side through the mixing valve 32a. Further, the hot water can be discharged to the bathtub 11 side through the mixing valve 32b. At this time, the electromagnetic valve 33a is closed.

  Here, the flow rate of the hot water flowing through the boiling circuit A is adjusted by the pump 8a, and the flow rate of the hot water flowing through the chase circuit B (the hot water flowing through the hot water discharge pipe 20) depends on the flow rate discharged at the hot water outlet terminal. The pump 8b may be stopped as long as it is a pump that can flow in the forward direction even when stopped, or may be operated to increase the pressure. When the pressure is increased, the pressure of the hot water at the hot water terminal increases, so that the hot water flow rate can be increased and the hot water can be discharged to a high place.

  In this operation mode, the hot water on the follow-up circuit B side in the follow-up heat exchanger 9 flows to the mixing valve 32a or the mix valve 32b, so that it does not return to the hot water supply tank 7 even if the temperature drops due to heat exchange. Therefore, heat is exchanged in the follow-up heat exchanger 9 so that the temperature of the hot water on the follow-up circuit B side after passing becomes the minimum temperature (for example, about 45 ° C.) necessary for hot water supply. Thereby, the heat radiation temperature difference in the follow-up heat exchanger 9 can be increased (for example, 20 ° C. difference of 65 ° C. → 45 ° C.), and the follow-up ability can be increased. A method for controlling the temperature of hot water passing through the follow-up heat exchanger 9 (temperature related to detection by the temperature sensor 13m) is performed by controlling the flow rate of the bathtub water circulating in the bathtub circulation circuit C by the pump 8c. If the flow rate of the bathtub water circulating through the bathtub circulation circuit C is increased, the temperature of the hot water flowing through the tracking circuit B is lowered. On the other hand, if the flow rate of the bathtub water is reduced, the temperature of the hot water flowing through the tracking circuit B rises. Thereby, the temperature of the hot water flowing through the tracking circuit B can be controlled to a target temperature.

  Moreover, about the boiling temperature (temperature which concerns on the detection of the temperature sensor 13c) of the heat pump unit 1, it pumps so that the temperature which the temperature sensor 13m detects may become more than the minimum temperature (for example, about 45 degreeC) required for hot water supply. 8a is driven and controlled. In the heat pump unit 1, the efficiency increases as the temperature of hot water to be heated is lower. Therefore, in the case of the main operation mode, the operation is performed such that the boiling temperature is lower than the boiling temperature when hot water is stored (for example, 65 ℃ → 45 ℃). As a result, a high-efficiency follow-up operation is possible in which high-efficiency heat pump heat with low boiling is added to the hot water stored in the hot water supply tank 7. Here, when the hot water discharge or the hot water supply stop is frequently performed from the hot water discharge pipe 20, the heat pump unit 1 may not be able to follow the boiling temperature change control. In such a case, the operation of the heat pump unit 1 may be stabilized by fixing the boiling temperature to a normal hot water storage temperature.

<Effect “Heat pump chasing + Hot water supply mode” >>
In the operation mode shown in FIG. 5, the hot water (medium temperature water) that has passed through the follow-up heat exchanger 9 is directly discharged from the hot water discharge pipe 20 to the outlet terminal side, so that the intermediate temperature water does not return to the hot water supply tank 7. . For this reason, it is possible to prevent a decrease in the operation efficiency of the heat pump unit 1 due to boiling of the medium temperature water in the hot water supply tank 7 and to improve the hot water storage system efficiency (the operation efficiency of the entire hot water supply system such as hot water supply and chasing). Further, in the follow-up heat exchanger 9, a large amount of heat can be given to the bathtub water circulating in the bathtub circulation circuit C, and the temperature of the hot water flowing through the follow-up circuit B is set to “heat pump hot water storage follow-up” described in FIG. The mode can be lowered (for example, 65 → 45 ° C.). For this reason, it becomes possible to increase the chasing capability as compared with the “heat pump hot water chasing mode”. Further, the temperature of hot water (temperature related to detection by the temperature sensor 13m) on the side of the tracking circuit B after passing through the tracking heat exchanger 9 is controlled by controlling the flow rate of the bathtub water with the pump 8c. Therefore, for example, even when the boiling temperature change control cannot be followed in the heat pump unit 1 in a transient state, the temperature of the hot water supplied from the hot water discharge pipe 20 to the mixing valves 32a and 32b can be stabilized. Furthermore, since the boiling temperature of the hot water in the heat pump unit 1 can be suppressed lower than the boiling operation for storing hot water, the heat pump can be operated with high efficiency. In addition, in this operation mode, the hot water heated by the heat pump unit 1 can be directly discharged, so that there is no heat loss characteristic of the hot water storage hot water supply device that occurs once in the hot water supply tank 7. For this reason, it can utilize, without losing the calorie | heat amount which concerns on the boiling of the heat pump unit 1. FIG.

《Operation “Catch-up + Hot-water supply mode”》
FIG. 6 is a diagram showing the operation of the apparatus and the flow of water in the hot water storage type hot water supply apparatus in the “chasing + hot water supply mode” that can simultaneously perform the operation for chasing and hot water supply. The difference from the “heat pump chasing + hot water supply mode” shown in FIG. 5 is that the heat pump unit 1 is turned off and the pump 8a is stopped so that hot water does not flow into the boiling circuit A. Other basic operations are the same as those in the “heat pump chase + hot water supply mode” described above. For this reason, the temperature of the hot water (temperature related to detection by the temperature sensor 13m) on the side of the tracking circuit B after passing through the tracking heat exchanger 9 is controlled by controlling the flow rate of the bath water using the pump 8c.

《Effect `` Driving + Hot water supply mode ''》
In this operation mode, hot water (medium temperature water) that has passed through the follow-up heat exchanger 9 is directly discharged from the hot-water pipe 20 to the hot-water terminal side, as in the “heat pump chase + hot-water supply mode” shown in FIG. Therefore, the medium temperature water does not return to the hot water supply tank 7. For this reason, it is possible to prevent a decrease in the operation efficiency of the heat pump unit 1 due to boiling of the medium temperature water in the hot water supply tank 7 and to improve the hot water storage system efficiency (the operation efficiency of the entire hot water supply system such as hot water supply and chasing). In this operation mode, since the heat pump unit 1 is operated without being operated, the follow-up and hot water supply can be performed without worrying about the delay in the start-up of the heat pump unit 1 (transient state until the boiling temperature is stabilized). Can be performed simultaneously. For this reason, it is easy to cope even when the hot water from the hot water pipe 20 or the hot water stop by the user operation is frequently performed.

《Operation `` Catch mode ''》
FIG. 7 is a diagram illustrating the operation of the apparatus and the flow of water in the hot water storage type hot water supply apparatus in the “chasing mode” in which hot water supply is not performed in the mode shown in FIG. 6. The difference from the “chasing / hot water supply mode” shown in FIG. 6 is that there is no flow of hot water from the tapping pipe 20 and the solenoid valve 33a is opened, so that hot water passing through the chasing heat exchanger 9 is supplied. It is to return to the upper part of the tank 7. In this operation mode, hot water (high temperature water) from the upper part of the hot water supply tank 7 is led to the follow-up heat exchanger 9 by the follow-up circuit B, and is cooled by exchanging heat with the bath water in the bathtub circulation circuit C and then cooled. Return to the top. For this reason, the temperature of hot water (temperature of hot water returning to the hot water supply tank 7) on the side of the follower circuit B after passing the follower heat exchanger 9 becomes lower than the temperature of hot water in the upper part of the hot water supply tank 7. By setting the temperature of the hot water returning to the hot water supply tank 7 to 45 ° C. or higher that can be used for the purpose of hot water supply, it becomes possible to perform a chasing operation without greatly reducing the amount of effective hot water stored in the hot water supply tank 7. For example, when water of 45 ° C. or lower is returned to the hot water supply tank 7, the temperature after mixing in the hot water supply tank 7 becomes lower than the hot water supply effective temperature, which may greatly reduce the effective hot water storage amount (30 ° C. hot water and 65 ° C. If hot water is mixed, depending on the amount of hot water remaining in the hot water tank 7, the temperature of the hot water in the upper part of the hot water tank 7 may be 45 ° C. or less). On the other hand, if the temperature is 45 ° C or higher, the temperature of the hot water becomes equal to or higher than the hot water supply effective temperature even if mixing is performed, so the mixing does not significantly reduce the effective amount of stored hot water supply. Even if it does not become 45 degrees C or less).

<< Operation "Mode Transition">>
Each mode described above can be easily switched depending on the presence or absence of hot water supply. For example, in the case of chasing by the heat pump unit 1, if there is no hot water supply, the "heat pump hot water chasing mode" shown in FIG. 4 is performed, and if there is hot water, the "heat pump chasing + hot water supply mode" shown in FIG. Do. Further, in the case where the heat pump unit 1 does not perform chasing, if there is no hot water supply, the “chasing mode” shown in FIG. 7 is performed, and if there is hot water, the “chasing + hot water supply mode” shown in FIG. 6 is performed.

  Next, the relationship between the “heat pump chasing mode” and the “heat pump chasing + hot water supply mode” will be described. For example, when the hot water in the hot water storage tank 7 needs to be additionally boiled by supplying water from the water supply pipe 21 and the bathtub 11 is driven (for example, when the temperature of the bathtub water in the bathtub 11 is lowered even slightly from the target value). In addition, when an offset such as ± 1 ° C. is taken into account, the chasing operation may be started earlier even if the temperature is higher than the target temperature), and the operation in the “heat pump hot water chasing mode” is performed. In this operation mode, as described above, the hot water in the upper part of the hot water storage tank 7 is kept at a high temperature, so that the temperature difference between the hot water returning from the follow-up heat exchanger 9 to the hot water supply tank 7 and the upper temperature of the hot water supply tank 7 is reduced. It is possible to drive. In this case, since the chasing ability is not large, the heating speed of the bathtub water by chasing becomes slow. The automatic heat-retaining operation for keeping the temperature of the bathtub 11 constant does not require a large capacity, and is therefore suitable for an operation for keeping the temperature of the hot water in the bathtub 11. Here, when there is hot water from the hot water pipe 20 due to a request from the user, the mode is changed to “heat pump chasing + hot water supply mode”. In this mode, since the hot water is discharged without returning to the hot water supply tank 7, the temperature of the hot water on the side of the follower circuit B after passing through the follower heat exchanger 9 can be lowered to perform operation with a large follower capability. .

《Effect `` Mode transition ''》
For example, by combining “heat pump chasing mode” and “heat pump chasing + hot water supply mode”, even when chasing the same amount of heat, it is possible to increase the ratio of high-efficiency operation linked to hot water supply and improve system efficiency. It becomes possible. Such an operation method is suitable for an automatic heat insulation operation in which the on / off of the tracking can be controlled on the equipment (tub 11) side.

  FIG. 8 is a diagram showing an example of a time-series change of the operation pattern in each mode, the relationship between hot water supply load presence / absence, operation mode transition, and tracking ability. In FIG. 8, it is assumed that the boiling operation by the heat pump unit 1 is always performed. In FIG. 8, only hot water is stored in the hot water storage tank 7 by the boiling operation of the heat pump unit 1 at first. By starting the chasing (heat insulation) operation at time α, the “heat pump hot water chasing mode” is set. At time β, γ, and θ, hot water is discharged to the hot water terminal via the hot water supply pipe 20, so that the mode transitions to “heat pump follow-up + hot water supply mode” at this timing. Here, the hot water at the last time θ assumes a load in the shower. When transitioning to “heat pump chasing + hot water supply mode”, chasing ability increases. When the hot water is finished, the mode transitions to the “heat pump hot water storage follow-up mode” again. As in the “heat pump chasing + hot water supply mode”, when there is a hot water discharge load, high-efficiency operation without returning the medium-temperature water to the hot water supply tank 7 becomes possible. After the time θ, in the chasing (warming) operation, when the temperature of the bathtub water in the bathtub 11 reaches the target value, the “heat pump hot water chasing mode” ends. Thereafter, the boiling operation for performing only hot water storage in the hot water storage tank 7 is performed again.

  As described above, when the bath water of the bathtub 11 is chased, in the “heat pump chasing + hot-water supply mode”, chasing (heat insulation) with increased system efficiency is performed. On the other hand, when there is no hot water from the hot water pipe 20, it is possible to increase the ratio of highly efficient operation at the time of chasing by reducing the capacity as “heat pump hot water chasing mode” and preparing for the next hot water. As a result, the efficiency of the entire system can be improved. Here, in the description of the operation pattern based on FIG. 8, the case where the heat pump unit 1 performs the boiling operation has been described. Especially when boiling operation is not necessary (when there is a sufficient amount of heat storage in the hot water supply tank 7), a mode is set between the “chasing + hot water supply mode” shown in FIG. 6 and the “chasing mode” shown in FIG. By making the transition, it is possible to cope with the effective use of high-efficiency operation at the time of hot water. In this case, the boiling operation using the heat pump unit 1 is unnecessary, and only the follow-up operation needs to be performed. When there is no hot water to the hot water terminal via the hot water supply pipe 20, the operation in the “chasing mode” shown in FIG. 7 is performed. When there is hot water, operation is performed in the “chasing + hot water supply mode” shown in FIG. As a result, even when the boiling operation is unnecessary, the hot water (medium hot water) on the side of the follower circuit B that has passed through the follower heat exchanger 9 is directly discharged from the hot water discharge pipe 20 so as to improve the system efficiency. Is possible.

Embodiment 5 FIG.
FIG. 9 is a diagram illustrating a configuration of a hot water storage type hot water supply apparatus according to Embodiment 5 of the present invention. In FIG. 9, means and the like having the same reference numerals as in FIGS. 4 to 7 perform the same operations as those described in the first and fourth embodiments.

  The hot water storage type hot water supply apparatus of the present embodiment shown in FIG. 9 realizes the same function as the hot water storage type hot water supply apparatus described in the fourth embodiment. The difference from the hot water storage type hot water supply apparatus of the fourth embodiment is that the pump 8a is not provided and a three-way valve 50a is provided instead. The three-way valve 50a mixes water flowing in from two directions at a predetermined ratio by opening degree control. In the present embodiment, the hot water flowing through the boiling circuit A and the hot water flowing through the pipe D are merged and flowed out to the follow-up heat exchanger 9 side. Here, in the present embodiment, by controlling the mixing ratio of the three-way valve 50a, it is possible to control the amount of heat exchange in the follow-up heat exchanger 9, so even if the flow rate of the pump 8b is fixed. Good. The basic operation of the hot water storage type hot water supply apparatus of the present embodiment is the same as the operation in each mode of the fourth embodiment. Here, the operation of the three-way valve 50a, which is a feature of the apparatus according to the present embodiment, will be described.

  In the hot water storage type hot water supply apparatus of the fourth embodiment, the flow rate of hot water flowing through the boiling circuit A is controlled by the pump 8a. In the present embodiment, the ratio of the flow rate of hot water flowing through the boiling circuit A and the flow rate of hot water flowing through the pipe D is performed by controlling the opening of the three-way valve 50a. By opening the opening of the three-way valve 50a to the boiling circuit A, the flow rate of the boiling circuit A can be increased, and by decreasing the flow rate of the boiling circuit A, the flow rate of the boiling circuit A can be decreased. The opening degree control is performed by, for example, the measurement control device 14b. Thereby, since the expensive pump 8a can be reduced, the cost of the apparatus can be reduced. Further, as in the fourth embodiment, since no warm water is generated in the hot water tank 7, it is possible to prevent a decrease in heat pump operation efficiency due to boiling of warm water, and hot water storage system efficiency (hot water supply system such as hot water supply and chasing) Overall operation efficiency) can be improved.

Embodiment 6 FIG.
FIG. 10 is a diagram showing a configuration of a hot water storage type hot water supply apparatus according to Embodiment 6 of the present invention. In FIG. 10, means and the like having the same reference numerals as in FIGS. 4 to 7 perform the same operations as those described in the first and fourth embodiments.

  The hot water storage type hot water supply apparatus of the present embodiment shown in FIG. 10 realizes the same function as the hot water storage type hot water supply apparatus described in the fourth embodiment. The difference from the hot water storage type hot water supply apparatus of the fourth embodiment is that it has a three-way valve 50b serving as switching means. The three-way valve 50b returns the hot water on the side of the follower circuit B that has passed through the follower heat exchanger 9 to the upper part of the hot water supply tank 7 via the pipe E, or flows to the heat pump unit 1 via the pipe G, or closes the three sides. Therefore, it is possible to switch between three patterns that do not flow in either direction (pass the hot water pipe 20). For this reason, in the present embodiment, the hot water on the side of the follower circuit B that has passed through the follower heat exchanger 9 can be flowed to the heat pump unit 1. Accordingly, it is possible to form a closed circuit in which the hot water (high-temperature water) boiled by the heat pump unit 1 is guided to the follow-up heat exchanger 9 and used for follow-up, and then flows again to the heat pump unit 1. Accordingly, it is possible to perform a chasing operation using the heat pump unit 1 without flowing in and out of the hot water in the hot water storage tank 7. For this reason, for example, hot water (medium temperature water) on the side of the follower circuit B that has passed through the follower heat exchanger 9 does not flow into the hot water supply tank 7. Accordingly, since no warm water is generated in the hot water tank 7, it is possible to prevent a decrease in heat pump operation efficiency due to boiling of the warm water, and improvement of hot water storage system efficiency (operating efficiency of the entire hot water system such as hot water supply and chasing). Is possible.

  1 heat pump unit, 2 tank unit, 3 compressor, 4 water refrigerant heat exchanger, 5 expansion valve, 6 air heat exchanger, 6A fan, 7 hot water tank, 8a, 8b, 8c pump, 9 follow-up heat exchanger, 10 Three-way valve, 11 Bath, 12a, 12b Pressure sensor, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h, 13i, 13j, 13k, 13L, 13m, 13n, 13o, 13p Temperature sensor, 14a, 14b Measurement control device, 20 tap pipe, 21 water supply pipe, 30, 31 inlet, 32a, 32b mixing valve, 33a, 33b solenoid valve, 34 mixing plug, 40a, 40b, 40c flow sensor, 50a, 50b three-way valve, A boiling Raising circuit, B tracking circuit, C bathtub circulation circuit.

Claims (17)

A hot water tank for storing hot water,
Heating means for heating the hot water in the hot water tank;
A follow-up heat exchanger that heats the medium to be heated by exchanging heat with hot water in the hot water tank;
Forming a chasing circuit for causing a part or all of the hot water in the hot water tank that has passed through the chasing heat exchanger to flow from the upper part of the hot water tank into which hot water merged with hot water heated by the heating means is introduced. Hot water storage type hot water supply device.   The heating means, together with a compressor, an expansion valve, and an evaporator, constitutes a refrigeration cycle circuit that circulates refrigerant, and is a water-refrigerant heat exchanger that exchanges heat between hot water in the hot water supply tank and the refrigerant. The hot water storage type hot water supply apparatus according to claim 1.   The measurement control apparatus which performs heating control of the said heating means is further provided so that the temperature of the hot water heated by the said heating means may become higher than the temperature of the hot water in the hot water supply tank upper part. Hot water storage water heater.   Three-way for branching the hot water that has passed through the follow-up heat exchanger into a flow path for joining the hot water heated by the heating means and a flow path that flows from the central portion of the hot water supply tank or from below the central portion. The hot water storage type hot water supply apparatus according to any one of claims 1 to 3, further comprising a valve.   The hot water storage apparatus according to claim 4, further comprising a measurement control device that controls an opening degree of the three-way valve so that a temperature of the joined hot water is the same as a temperature of hot water in an upper portion of the hot water tank. Water heater. A hot water tank for storing hot water,
A water refrigerant heat exchanger that, together with the compressor, the expansion valve, and the evaporator, constitutes a refrigeration cycle circuit that circulates the refrigerant, heats the hot water in the hot water tank and the refrigerant to heat them, and
A follow-up heat exchanger that heats the heated medium by exchanging heat with hot water in the hot water tank, and hot water that has passed through the follow-up heat exchanger is joined with hot water heated by the water-refrigerant heat exchanger. A hot water storage type hot water supply apparatus comprising: a flow path for flowing in from an upper part of the tank; and a three-way valve for branching into a central portion of the hot water supply tank or a flow path for flowing in from below the central portion. A hot water tank for storing hot water,
Heating means for heating the hot water in the hot water tank;
A follow-up heat exchanger that heats the medium to be heated by heat exchange with hot water in the hot water supply tank;
Flow rate ratio control means for changing a ratio of the flow rate of the hot water passing through the heating means and the flow rate of the hot water passing through the follow-up heat exchanger;
Hot water that has been heated by passing through the heating means from the lower part of the hot water tank and hot water that has been introduced from the upper part of the hot water tank, passed through the follow-up heat exchanger, and fed from the upper part of the hot water tank A hot water storage type hot water supply apparatus characterized by forming a circuit. The flow rate control means includes:
A pump for driving to control the flow rate of hot water passing through the heating heat exchanger;
The hot water storage type hot water supply apparatus according to claim 7 , further comprising a heating pump for controlling a flow rate of hot water passing through the heating means. The flow rate control means includes:
A pump for passing hot water through the follow-up heat exchanger;
According to claim 7, characterized in that it comprises a mixing valve for mixing while controlling the ratio of the hot water which led hot water heated by passing through the heating means from the lower portion of the hot water tank from the hot water supply tank top Hot water storage system. Hot water storage type hot water supply apparatus according to claim 7-9, wherein further comprising a measurement control device for controlling the hot water temperature which flows into the hot water supply tank by controlling the flow ratio control means. At least a temperature based on the temperature of the upper part of the hot water supply tank and a hot water set temperature set for hot water sent to the hot water terminal can be set to be switchable as a target temperature of the hot water flowing into the hot water tank. Item 11. A hot water storage type hot water supply apparatus according to Item 10 . The measurement control device
The hot water storage type hot water supply apparatus according to claim 11 , wherein a target temperature of hot water flowing into the hot water supply tank is determined based on whether or not the hot water is sent to the hot water terminal. A hot water pipe for branching from a flow path between the hot water outlet of the follow-up heat exchanger and the upper part of the hot water storage tank, and for sending hot water to a hot water terminal;
The switch according to any one of claims 8 to 12 , further comprising switching means for switching whether the hot water passing through the follow-up heat exchanger flows into a hot water discharge pipe or flows into the hot water supply tank. Hot water storage water heater. A hot water pipe for branching from a flow path between the hot water outlet of the follow-up heat exchanger and the upper part of the hot water storage tank, and for sending hot water to a hot water terminal;
Or allowed to flow into the hot water supply tank, according to claim 8, characterized in, further comprising a switching means for switching between the flow of hot water that has passed through or the chase fired heat exchanger flowing through said heating means tapping tube - The hot water storage type hot water supply apparatus according to any one of 12 . The switching means is a three-way valve, and is connected to the hot water outlet side of the follow-up heat exchanger and the flow path to the upper part of the hot water storage tank, to the hot water outlet side of the follow-up heat exchanger and to the heating means. 15. The hot water storage type hot water supply apparatus according to claim 14, wherein the flow path or three sides are closed so that the flow path to the hot water outlet of the follow-up heat exchanger and the flow path to the outlet pipe can be selectively selected. The hot water storage type hot water supply apparatus according to any one of claims 13 to 15 , further comprising a measurement control device that performs switching control of the switching means based on whether or not to send the hot water to the hot water terminal. A medium pump for passing the heated medium through the follow-up heat exchanger;
To send to the tapping tube hot water at the top and a predetermined temperature of the hot water tank, further comprising a measurement control unit for controlling the flow rate of the heated medium passing through the chase fired heat exchanger by the medium pump The hot water storage type hot water supply apparatus according to any one of claims 13 to 16 .

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