JP2002098411A - Hot water feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize a hot water feeding device as a heat source for a feed of hot water and reheating of bathtub water and heating as hot water stored in a hot water storage tank is always maintained in a layer-form manner. SOLUTION: A hot water feeding device comprises the hot water storage tank 20 to store hot water; a first circulating means 21 to take out hot water in the hot water storage tank 20 from the hot water storage tank and cause feedback of it again; a hot water storage heat exchanger 22 situated above the first circulating means 21 and heating hot water passing through the first circulating means; and hot water feed piping 23 to feed hot water in the hot water storage tank 20 to the outside of the hot water storage tank 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage tank for storing hot water and an apparatus for using the hot water stored in the hot water storage tank as a heat source for hot water supply, reheating of a bath, and heating.

[0002]

2. Description of the Related Art Conventionally, this type of hot water supply and heat utilization apparatus has been generally used in a cogeneration system disclosed in Japanese Patent Application Laid-Open No. 08-28955.

FIG. 3 is a configuration diagram schematically showing a conventional cogeneration system. As shown in FIG. 3, the hot water storage tank 3 for supplying water from the pipe 8 is provided with the pipes 2 and 1 from the cogeneration means 1 and 14.
An exhaust heat recovery heat exchanger 4 which receives heat supply via the heat exchanger 3 is incorporated so that the temperature difference between the exhaust heat and the stored hot water temperature is increased from the cogeneration side.

Further, a heater 15 is attached to the hot water supply line 9 leading to the hot water tap 10, and only when the hot water demand setting water temperature is lower than the stored hot water temperature, the heater 15 is driven to raise the temperature to the desired water temperature. When hot water is supplied and the stored hot water temperature is equal to or higher than the set hot water demand water temperature, the hot water is bypassed by a bypass line 17 and directly supplied to the hot water tap 10 via a valve 18.
I was trying to get hot water.

[0005]

However, in the conventional apparatus, the configuration in which the waste heat from the cogeneration means 1 and 14 is recovered in the hot water tank 3 is as follows.
The heat exchanger 4 for waste heat recovery is simply incorporated in the hot water storage tank 3, and the entire amount of water in the hot water tank 3 is removed by the heat exchanger 4 for waste heat recovery.
To heat and boil the entire hot water storage tank 3
When the hot water in the hot water storage tank 3 is lower than the hot water supply demand set water temperature (for example, in the case of the total amount of water), the heating by the exhaust heat recovery is continued for a long time until the water in the hot water storage tank 3 all the time becomes higher than the hot water demand set water temperature. I had to.

In addition, since the heat exchange time of the entire amount of the hot water storage tank 3 is required for a long time, the temperature of the hot water supply demand is not higher than the set water temperature at the time of hot water supply.
To increase the temperature of the water to a desired temperature by driving the heater, the heating energy of the heater 15 is required, and
There is a problem that the efficiency is reduced only by the hot water supply efficiency of the heater 15 with the use of the heater.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to reduce the frequency with which the temperature of hot water in a hot water tank becomes equal to or lower than a set hot water supply demand water temperature, and to provide a hot water supply that can be operated with high efficiency. It is intended to provide a device.

[0008]

In order to achieve the above object, a first aspect of the present invention (corresponding to claim 1) is to provide a hot water storage tank for storing hot water and a hot water storage tank for storing hot water in the hot water storage tank. A first circulating means that is taken out of the first circulating means, is returned on the first circulating means, and a first heating means is provided on the first circulating means and heats hot water passing through the first circulating means; A hot water supply pipe for supplying hot water to the outside of the hot water storage tank, the hot water storage tank holds the hot water so that the hot water to be stored has a predetermined temperature gradient, and the first circulating means includes: When circulating hot and cold water in the hot water storage tank, in the predetermined temperature gradient, take out hot and cold water from the coldest part, and to the hottest part,
Returning the hot water heated by the first heating means,
The hot water supply pipe is a hot water supply device, wherein the hot water is supplied to the outside of the hot water storage tank from a portion having the highest temperature in the predetermined temperature gradient.

Further, the second invention (corresponding to claim 2)
A second circulating means for taking out hot water in the hot water storage tank from the hot water storage tank and returning the hot water to the hot water storage tank, and temporarily disposing hot water and water provided on the second circulating means and passing through the second circulating means. Hot water accumulating means for accumulating water, a second heating means for heating at least the hot water accumulating means, a circulating water temperature detecting means for detecting a temperature of hot water returning from the second circulating means to the hot water storage tank, A hot water storage tank circulating water temperature control means for controlling a circulating water flow rate of the second circulating means and a combustion amount of the second heating means in accordance with a temperature detected by the circulating water temperature detecting means; In the present invention, when the hot water in the hot water storage tank is circulated, the hot water is taken out and returned from a portion having the highest temperature in the predetermined temperature gradient.

Further, the third invention (corresponding to claim 3)
Is the first aspect of the present invention, further comprising first heat exchange means for exchanging heat with hot water in the hot water storage means.

A fourth aspect of the present invention (corresponding to claim 4)
A third circulating means for taking out hot water in the hot water storage tank from the hot water storage tank and returning it again, a second heat exchange means for at least exchanging heat with hot water circulating in the third circulating means, Third heating means for heating at least the second heat exchange means, circulating water temperature detecting means for detecting a temperature of hot water returning from the third circulating means to the hot water storage tank, and detection of the circulating water temperature detecting means A hot-water storage tank circulating-water temperature control means for controlling a circulating water flow rate of the third circulating means and a combustion amount of the third heating means in accordance with a temperature, wherein the third circulating means comprises: The present invention is characterized in that when circulating hot and cold water, hot water is taken out and returned from a portion having the highest temperature in the predetermined temperature gradient.

Further, the fifth invention (corresponding to claim 5)
A branch pipe that branches from a part of the hot water supply pipe and is provided so as to merge with the hot water supply pipe again; and a hot water supply side that is provided on the branch pipe and heats hot water passing through the branch pipe. A heat exchanger, wherein the second heating means or the third heating means also heats the hot water supply side heat exchanger.

The present invention described above comprises, for example, a first circulating means for controlling the flow rate of hot water stored in a hot water storage tank, a hot water storage tank for storing hot water in a stacked manner from above, and a hot water supply pipe for supplying hot water from the hot water storage tank. It branches into a circulation pipe to be used as a heat source for heat utilization means such as post-bath heating and heating, and when the hot water in the hot water storage tank is insufficient, the hot water from the hot water storage tank is located in the hot water supply side heat exchanger and circulation pipe route. The heat exchange tank is connected to the heat exchange tank that exchanges heat with a burner that heats the tank, so that the hot water temperature and the hot water flow rate of the return pipe to the hot water storage tank side of the circulation pipe are stored in the hot water storage tank in a stacked manner. And a temperature control means for controlling the circulation flow rate of the second circulation means and the combustion amount of the burner so as to maintain the temperature gradient of the hot water storage tank. The hot water storage to always performed so than the setting and the top at a water temperature above such as hot water demand and heating demand in layers. Then, even if the total amount of hot water storage tank does not exceed the set water temperature such as hot water supply demand or heating demand, the required amount of hot water can be used for hot water supply and heating when the hot water storage tank can store the hot water.

Further, in order to meet the demand for heating, etc., the hot water is circulated from the upper part of the hot water storage tank, heat is exchanged by the heat exchange tank, and the heat is returned to the upper part of the hot water storage tank again with only a slight temperature drop. The hot and cold water stored in the stack can be stirred and maintained without breaking the temperature gradient.

Further, if the present invention is applied to an exhaust heat recovery device such as a combined heat and power supply device, if the amount of heat recovered to the hot water storage tank is larger than the demand for hot water supply or the demand for heating, the set water temperature for the hot water storage tank for the entire amount of hot water supply or the demand for heating. Convenient because the required amount of hot water can be stored at the stage where the required amount of hot water can be stored without additional reheating by the auxiliary heat source for a long time until the hot water is stored. Performance and responsiveness are improved, and the opportunity to operate an auxiliary heat source such as reheating is reduced, so that the exhaust heat recovery efficiency is extremely improved.

Further, hot water is always stored in the hot water storage tank at a temperature higher than a set water temperature such as a hot water supply demand or a heating demand, and is stacked from the top. Then, even if the total amount of hot water storage tank does not exceed the set water temperature such as hot water supply demand or heating demand, the required amount of hot water can be used for hot water supply and heating when the hot water storage tank can store the hot water.

In order to meet the demand for heating, etc., hot water is circulated from the upper part of the hot water storage tank, heat is exchanged by the heat exchange tank, and returned to the upper part of the hot water storage tank with only a slight temperature drop. Hot water stored in a stacked state can be maintained without stirring.

Furthermore, since the hot water supply side heat exchanger and the heat exchange tank for additional heating and heating of the bath are integrated into a burner, the configuration of the auxiliary heat source can be made simple and compact.

Further, the hot water is always stored in the hot water storage tank so that the temperature of the hot water is equal to or higher than a set water temperature such as a hot water supply demand or a heating demand, and the hot water is stacked from the upper portion. Then, even if the total amount of hot water storage tank does not exceed the set water temperature such as hot water supply demand or heating demand, the required amount of hot water can be used for hot water supply and heating when the hot water storage tank can store the hot water.

In order to meet the demand for heating, etc., hot water is circulated from the upper part of the hot water storage tank, heat is exchanged by the heat exchange tank, and returned to the upper part of the hot water storage tank with only a slight temperature drop. The hot water stored in the shape can be maintained without stirring.

Further, in the burner configuration for heating the first heat exchanger and the third heat exchanger, the first and third heat exchangers are provided side by side in the same heat exchanger. The vessel can be made more compact.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram of a hot water supply apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 20 denotes a hot water storage tank for storing hot water in a stacked manner from the top. ) And a hot water storage heat exchanger 22 for exchanging heat from a heating means such as a heater (not shown) or an exhaust heat recovery means such as a cogeneration unit.
A hot water supply pipe 23 for supplying hot water in the hot water storage tank 20 branches from an upper portion of the hot water storage tank 20, and a hot water supply thermistor 24 is provided in the hot water supply pipe 23 to detect an outlet temperature of the hot water storage tank.

Further, at the upper part of the hot water storage tank 20, a second circulating means (hereinafter referred to as an inter-tank circulation pump 25) for circulating the stored hot water and a circulating water temperature detection for detecting the hot water temperature of the return pipe to the hot water storage tank side. A circulation pipe 27 having means 26 (hereinafter referred to as a circulation pipe thermistor 26) is connected, and a heat exchange tank 28 for exchanging heat with hot water from the hot water storage tank 20 is provided at the other end of the path of the circulation pipe 27. On the downstream side from the hot water supply pipe 23, a branch pipe 29 branched for additional heating when the hot water temperature of the hot water storage tank 20 is low, a flow path switching valve 30 for branching hot water of the hot water storage tank 20 to the branch pipe, and a branch pipe. A hot water supply side heat exchanger 31 for reheating and heating the hot water 29, a reheating outlet thermistor 32 for detecting the temperature of the hot water after reheating, and a hot water tap 33 for using hot water are connected.

Numeral 34 denotes a burner for heating the heat exchange tank 28 for exchanging heat with hot water from the hot water storage tank 20 and the hot water supply side heat exchanger 31. The heat exchange tank 28 is connected to a heat utilization means 35. A part of the heat utilization circulation pipe 38 is disposed, and a third path for circulating a circulating liquid such as an antifreeze as a heat source of the heat utilization means 35 such as additional cooking of a bath or heating is provided in a path of the heat utilization circulation pipe 38. A circulating means 36 (hereinafter, referred to as a heat utilization circulating pump 36) and a circulating fluid thermistor 37 for detecting a temperature at which the circulating fluid is heated in the heat exchange tank 28 are connected. Further, a hot water storage tank circulating water temperature control means 39 for controlling the circulating water flow rate of the inter-tank circulating pump 25 and the combustion amount of the burner 34 in accordance with the temperature detected by the circulating pipe thermistor 26 is connected.

The operation and operation of the hot and cold water supply apparatus according to Embodiment 1 of the present invention having the above configuration will be described below.

First, at the time of hot water storage operation of the hot water storage tank 20,
A hot-water storage heat exchanger 22 that obtains heat from a heating means (not shown) such as a heating heater or an exhaust heat recovery means such as a cogeneration unit.
The amount of heat exchange from the hot water is adjusted by controlling the flow rate of hot water stored in the hot water circulation pump 21, and the hot water heated in the hot water storage heat exchanger 22 is stored in the hot water storage tank 20 at a predetermined temperature (for example, 70 to 80 ° C.). ) To store hot water. At this time, the first circulating means 21 takes out hot water from the lower part of the hot water storage tank 20 in which the coldest hot water is located, heats the hot water in the hot water storage heat exchanger 22, and then stores the heated hot water in the hot water storage heat exchanger 22. The water is poured into the upper part of the tank where the hottest water in the tank 20 is located.

When the hot water storage tank 20 is full, the hot water circulation pump 21 is stopped, and the heating by the hot water storage heat exchange is completed.

Next, when the amount of hot water stored in the hot water storage tank 20 is sufficient, the hot water supply temperature detected by the hot water supply thermistor 24 is higher than the hot water supply demand set water temperature when the hot water is used by the hot water supply tap 33. The reheating operation by the side heat exchanger 31 is unnecessary, and the hot water stored in the hot water storage tank 20 is directly supplied to the hot water tap 33 from the hot water supply pipe provided at the uppermost part of the hot water storage tank 20. That is, hot water that is sufficiently higher than the hot water supply demand set water temperature is supplied to the hot water tap 33 from the upper part of the tank where the hottest hot water in the hot water storage tank 20 is located.

When the amount of hot water stored in the hot water storage tank 20 is sufficient, if heat is used for additional heating of a bath or heating using the heat utilization means 35, the heat utilization means 35 is supplied by the heat utilization circulation pump 36. And the hot and cold water on the circulation pipe 27 side is circulated through the heat exchange tank 28 by the inter-tank circulation pump 25.

When the temperature of the circulating fluid thermistor 37 and the temperature of the circulating pipe thermistor 26 are input, the hot water storage tank circulating water temperature control means 39 determines the amount of circulation of the heat utilization circulation pump 36 and the inter-tank circulation pump 25 based on the detected temperatures. The temperature of the return pipe of the circulation pipe 27, that is, the hot water storage tank 20 is controlled.
The return temperature is set to be within a predetermined temperature range with respect to the hot water temperature in the hot water storage tank 20. For example, when the temperature of the hot water stored in the hot water storage tank 20 is 70 to 80 ° C., if the return temperature of the circulation pipe 27 is controlled to be within about 10 ° C. from the temperature of the hot water hot water, convection in the hot water storage tank 20 hardly occurs. It does not occur and does not break the laminated temperature gradient of the stored hot water.

If the heat utilization means 35 is, for example, a hot water circulation type floor heating or radiator heating, the demand setting temperature is about 60 ° C., and the circulation pipe 27 and the heat exchange tank 28
This required temperature can be maintained by the heat exchange between the heat-utilizing circulation pipe 38 and the heat-utilizing circulation pipe 38. The temperature of the return pipe of the circulation pipe 27, that is, the return temperature to the hot water storage tank 20, fluctuates depending on the amount of heat used by the heat utilization means 35, but when the amount of heat used increases and exceeds a predetermined temperature range than the temperature of the hot water storage water, That is, when the temperature becomes lower than the predetermined temperature range, the burner 34
By controlling the amount of additional heating by heating and the amount of combustion, the temperature of the hot water in the hot water storage tank 20 is controlled to be within a predetermined temperature range.

Therefore, the temperature of the return pipe of the circulation pipe 27 is always controlled so as to be within a predetermined temperature range with respect to the temperature of the hot water at a predetermined location in the hot water storage tank 20, so that the hot water storage tank 20
The temperature gradient of the hot water stored in the hot water is maintained without collapse.

Therefore, the amount of hot water stored in the hot water storage tank 20 decreases due to the use of hot water, and city water is supplied from the lower portion of the hot water storage tank 20 by the amount of hot water used, and hot water is accumulated in the upper portion of the hot water storage tank 20 and water is accumulated in the lower portion. Even in the state where the heat is utilized by the heat utilization means 35, the laminated state is maintained by the hot water storage tank circulating water temperature control means 39 which controls the circulating water flow rate of the inter-tank circulation pump 25 and the combustion amount of the burner 34. The heating operation to the heat utilization means can be realized as it is.

Next, when the amount of hot water stored in the hot water storage tank 20 is small and insufficient and the hot water supply temperature detected by the hot water supply thermistor 24 becomes lower than the hot water supply demand set water temperature when using the hot water supply by the hot water supply tap 33, A reheating operation in the branch pipe 29 path is required, and the hot water supply from the hot water storage tank 20 is switched from the side through which the hot water supply pipe 23 is directly passed to the side through the branch pipe 29 by using the flow path switching valve 30, and The operation is performed so as to compensate for the insufficient amount of heat by reheating of the hot water supply side heat exchanger 31.

Similarly, when the amount of hot water stored in the hot water storage tank 20 is insufficient and insufficient, and there is heat utilization such as additional cooking of a bath or heating, the hot water in the circulation pipe 27 is circulated by the inter-tank circulation pump 25. And the circulation piping thermistor 26
When the shortage of hot water in the hot water storage tank 20 is detected, the hot water storage tank circulating water temperature control means 39 stops the inter-tank circulation pump 25, heats and heats the heat exchange tank 28 with the burner 34, and performs the circulating liquid thermistor 37. Is detected, and the output of the heat utilization circulation pump 36 is controlled so as to maintain the demand set temperature for the heat utilization means 35.

Therefore, even if the amount of hot water stored in the hot water storage tank 20 decreases due to the use of hot water, and the hot water in the hot water storage tank 20 cannot be used for hot water use, hot water reheating or heating, etc. Vessel 31 and burner 3 of heat exchange tank 28
The heating operation at the required set temperature of the hot water supply and the heat utilization means can be realized by the heating control by the four heating.

(Embodiment 2) FIG. 2 is a block diagram showing a hot water supply apparatus according to Embodiment 2 of the present invention. In the figure, reference numeral 40 denotes a second heat exchanger, and reference numeral 41 denotes a third heat exchanger.

This embodiment has basically the same structure as that of the first embodiment, but differs from the first embodiment in that a circulation pipe 2 for exchanging heat with hot water from hot water storage tank 20 is provided.
7, a second heat exchanger 4 for exchanging heat of hot water from the hot water storage tank 20 with the circulating fluid of the external heat utilization means 35.
0 (hereinafter, referred to as a heat-utilizing heat exchanger 40), and a third heat exchanger 41 for further heating the circulating fluid heat-exchanged in the heat-utilizing heat exchanger 40 to a predetermined temperature.
(Hereinafter referred to as reheating heat exchanger 41) is the first heat exchanger 31
(Hereinafter, the hot water supply side heat exchanger 31) is provided in the same heat exchanger. In FIG. 2, components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

The operation and operation of the hot and cold water supply apparatus according to Embodiment 2 of the present invention having the above-described configuration will be described below.

First, at the time of hot water storage operation of hot water storage tank 20,
A hot-water storage heat exchanger 22 that obtains heat from a heating means (not shown) such as a heating heater or an exhaust heat recovery means such as a cogeneration unit.
The amount of heat exchange from the hot water is adjusted by controlling the flow rate of hot water stored in the hot water circulation pump 21, and the hot water heated in the hot water storage heat exchanger 22 is stored in the hot water storage tank 20 at a predetermined temperature (for example, 70 to 80 ° C.). ) To store hot water. At this time, as in the first embodiment, the first circulation means 21 takes out hot water from the lower part of the hot water storage tank 20 where hottest water is located, and heats the hot water in the hot water storage heat exchanger 22. ,
The heated hot water is poured into the upper part of the hot water storage tank 20 where the hottest hot water is located.

When the hot water storage tank 20 is full, the hot water circulation pump 21 is stopped, and the heating by the hot water storage heat exchange is completed.

Next, when the amount of hot water stored in the hot water storage tank 20 is sufficient, since the detected value of the hot water temperature in the hot water thermistor 24 is higher than the hot water demand set water temperature when hot water is used by the hot water tap 33, the hot water is supplied through the branch pipe 29. The reheating operation by the heat exchanger 31 is unnecessary, and the hot water stored in the hot water storage tank 20 is supplied directly to the hot water tap 33 from a hot water supply pipe provided at the top of the hot water storage tank 20. That is, hot water that is sufficiently higher than the hot water supply demand set water temperature is supplied to the hot water tap 33 from the upper part of the tank where the hottest hot water in the hot water storage tank 20 is located.

When the amount of hot water stored in the hot water storage tank 20 is sufficient, when heat is used for additional heating or heating of the bath using the heat utilization means 35, the heat utilization means 35 And the hot and cold water in the circulation pipe 27 is also circulated by the inter-tank circulation pump 25. At this time, the heat utilization circulation pipe 38 through which the circulating liquid on the heat utilization means 35 circulates, and the circulation pipe 27 exchange heat with each other via the heat utilization heat exchanger 40.

When the temperature of the circulating fluid thermistor 37 and the temperature of the circulating pipe thermistor 26 are input, the hot water storage tank circulating water temperature control means 39 determines the amount of circulation of the heat utilization circulation pump 36 and the inter-tank circulation pump 25 based on these inputs. The temperature of the return pipe of the circulation pipe 27, that is, the hot water storage tank 20 is controlled.
The return temperature is controlled so that the temperature of the hot water in the hot water storage tank 20 falls within a predetermined temperature range.

When the heat utilization means 35 is, for example, a hot water circulation type floor heating or radiator heating, the demand set temperature is about 6
The required temperature is about 0 ° C., and the required temperature can be maintained by heat exchange between the circulation pipe 27 and the heat utilization circulation pipe 38 via the heat utilization heat exchanger 40. The temperature of the return pipe of the circulation pipe, that is, the return temperature to the hot water storage tank 20 fluctuates depending on the amount of heat used by the heat utilization means 35. If the temperature falls below the predetermined temperature range, the burner 34
By controlling the amount of combustion by heating and reheating through the reheating heat exchanger 41, the temperature of the hot water in the hot water storage tank 20 is controlled to be within a predetermined temperature range.

Therefore, the temperature of the return pipe of the circulation pipe 27 is always controlled so as to be within a predetermined temperature range with respect to the temperature of the hot water at a predetermined position in the hot water storage tank 20.
The temperature gradient of the hot water stored in is maintained without collapse.

Therefore, the amount of hot water stored in the hot water storage tank 20 decreases due to the use of hot water, and city water is supplied from the lower portion of the hot water storage tank 20 for the amount of hot water used. Even in the state where the heat is utilized by the heat utilization means 35, the laminated state is maintained by the hot water storage tank circulating water temperature control means 39 which controls the circulating water flow rate of the inter-tank circulating pump 25 and the combustion amount of the burner 34 even when the heat utilization means 35 is in use. The heating operation to the heat utilization means can be realized.

Next, when the amount of hot water stored in the hot water storage tank 20 is small and insufficient, when the hot water supply temperature detected by the hot water supply thermistor 24 becomes lower than the set hot water supply demand water temperature when the hot water is supplied by the hot water tap 33, the branch pipe 29 A reheating operation in the path is necessary, and the hot water supply from the hot water storage tank 20 is switched from the side through which the hot water supply pipe 23 is directly passed to the branch pipe 29 side by using the flow path switching valve 30 to reduce the insufficient heat quantity of the stored hot water. The heat exchanger 31 operates so as to compensate for the additional heating.

Similarly, when the amount of hot water stored in the hot water storage tank 20 is insufficient and insufficient, and there is heat utilization such as additional cooking in a bath or heating, the hot water in the circulation pipe 27 is circulated by the inter-tank circulation pump 25. When the circulation piping thermistor 26 detects that the amount of hot water in the hot water storage tank 20 is insufficient, the hot water storage tank circulating water temperature control means 39 controls the inter-tank circulation pump 2.
5, the reheater 41 is heated and reheated by the burner 34, the temperature detected by the circulating fluid thermistor 37 is input, and the output of the heat utilization circulation pump 36 is set to the demand setting temperature for the heat utilization means 35. Control to maintain.

Therefore, even if the amount of hot water stored in the hot water storage tank 20 decreases due to the use of hot water, and the hot water in the hot water storage tank 20 cannot be used for hot water use, hot water reheating, heating, etc. The heating operation at the required set temperature of the hot water supply and the heat utilization means can be realized by heating control by heating the burner 34 of the heat exchanger 31 and the reheating heat exchanger 41.

In Embodiments 1 and 2 described above, only one system is shown as the heat exchange structure on the side of the heat utilization means 35 for performing additional cooking and heating of the bath. It goes without saying that a similar effect can be obtained even in a configuration in which a plurality of systems are separately connected to the bath reheating system and the heating system as the use unit 35. That is, the heat utilization means 35 may have a plurality of systems. In the first and second embodiments, the heat utilization means 3
Although the configuration has been described as including the fifth and third circulation means 38 and the like, the present invention may be realized with a configuration in which the heat utilization means 35 is omitted.

In each embodiment of the present invention, the hot water storage heat exchanger 22 is an example of the first heating means of the present invention, and the first circulating means 21 is an example of the first circulating means of the present invention. The second circulating means 25 and the circulating pipe 27 are an example of the second circulating means or the third circulating means of the present invention, and the heat exchange tank 28 is an example of the hot and cold water storing means of the present invention. The utilization means 35, the third circulation means 36, and the heat utilization circulation pipe 38 are the first heat exchange means or the second heat exchange means of the present invention.
The burner 34 is a second example of the present invention.
It is an example of the heating means or the third heating means.

[0054]

As is apparent from the above description, the hot water supply apparatus of the present invention has the following effects.

(1) Hot water is always stored in the hot water storage tank at a temperature higher than a set water temperature such as a hot water supply demand or a heating demand and is stacked from the upper portion to maintain a predetermined temperature gradient in the hot water storage tank. Can be used for hot water supply and heating when the required amount of hot water has been stored in the hot water storage tank even if the temperature does not exceed the set water temperature such as hot water demand or heating demand.

(2) In order to respond to the demand for heating, etc., the hot water storage tank is circulated from the upper part of the hot water storage tank, heat exchanged by the heat exchange means, and returned to the upper part of the hot water storage tank again with only a slight temperature drop. The hot and cold water stored in a stack can be stirred and maintained without breaking the temperature gradient.

(3) If applied to a waste heat recovery device such as a combined heat and power supply device, when the amount of heat recovered to the hot water storage tank is larger than the demand for hot water supply or the demand for heating, the demand for the total amount of hot water supply or heating demand for the hot water storage tank is set. Since the required amount of hot water can be stored at the stage where the required amount of hot water can be stored without the need for additional heating by the auxiliary heat source for a long time until the hot water above the hot water is stored, the hot water above the set water temperature such as hot water supply demand or heating demand can be supplied. Convenience and responsiveness are improved, and the opportunity to operate an auxiliary heat source such as reheating heating is reduced, so that the exhaust heat recovery efficiency is extremely improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a hot water supply device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a hot water supply apparatus according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional exhaust heat recovery device.

[Explanation of symbols]

 Reference Signs List 20 hot water storage tank 21 first circulation means 23 hot water supply pipe 25 second circulation means 26 circulating water temperature detection means 27 circulation pipe 28 heat exchange tank 31 hot water supply side heat exchanger 34 burner 35 heat utilization means 36 third circulation means 39 hot water storage Tank circulating water temperature control means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akinari Nakamura 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 3L025 AA06 AA08 AA13 AA14 AA37

Claims (5)

[Claims] 1. A hot water storage tank for storing hot water, a first circulating means for taking out hot water in the hot water storage tank from the hot water storage tank and returning it again, and a first circulating means provided on the first circulating means, A first heating means for heating hot water passing through the circulation means, and a hot water supply pipe for supplying hot water in the hot water storage tank to the outside of the hot water storage tank; Holding the hot water so as to have a predetermined temperature gradient, when circulating the hot water in the hot water storage tank, the first circulation means takes out the hot water from the lowest temperature portion in the predetermined temperature gradient, The hot and cold water heated by the first heating means is returned to the hottest area, and the hot water supply pipe stores the hot and cold water from the hottest area in the predetermined temperature gradient in the hot water storage tank. A hot and cold water supply device, which supplies the water outside. 2. A second circulating means for taking out hot water in the hot water storage tank from the hot water storage tank and returning the hot water to the hot water storage tank again, and a hot and cold water provided on the second circulating means and passing through the second circulating means. Water storage means for temporarily storing water, second heating means for heating at least the hot water storage means, and circulating water temperature detection means for detecting the temperature of the hot water returning from the second circulation means to the hot water storage tank. And a hot water storage tank circulating water temperature control means for controlling a circulating water flow rate of the second circulating means and a combustion amount of the second heating means in accordance with a temperature detected by the circulating water temperature detecting means, 2. The circulation means according to claim 1, wherein when circulating the hot water in the hot water storage tank, the hot water is taken out and returned from a portion having the highest temperature in the predetermined temperature gradient. Water supply apparatus. 3. The hot and cold water supply device according to claim 2, further comprising first heat exchange means for exchanging heat with hot and cold water in the hot and cold water storage means. 4. A third circulating means for taking out hot water from the hot water storage tank from the hot water storage tank and returning it again, and a second heat exchange for at least exchanging heat with hot water circulating in the third circulating means. Means, at least a third heating means for heating the second heat exchange means, a circulating water temperature detecting means for detecting a temperature of hot water returning from the third circulating means to the hot water storage tank, and a circulating water temperature detection A hot water storage tank circulating water temperature control means for controlling a circulating water flow rate of the third circulating means and a combustion amount of the third heating means in accordance with a detected temperature of the means; The hot water supply device according to claim 1, wherein when the hot water in the hot water storage tank is circulated, the hot water is taken out and returned from a portion having the highest temperature in the predetermined temperature gradient. 5. A branch pipe provided to branch off from a part of the hot water supply pipe and join again with the hot water supply pipe, and hot water passing through the branch pipe provided on the branch pipe is provided. 5. The hot water supply side heat exchanger further comprising: the second heating unit or the third heating unit also heats the hot water supply side heat exchanger. 6. Hot water supply device.