JP3345302B2 - Combustion heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a heat exchanger in which a plurality of heat exchanging portions which are heated while flowing a liquid to be heated supplied from an inlet and flow out to an outlet are integrally formed so as to conduct heat mutually. The present invention relates to a combustion-type heating device which is provided in a combustion gas flow path of a combustion burner in a state, and is configured such that supply of a liquid to be heated to each of the plurality of heat exchange units is intermittently separately performed.

[0002]

2. Description of the Related Art In such a combustion type heating apparatus, a liquid to be heated passing through a plurality of heat exchange sections is heated by a combustion gas of a combustion burner. Is used for various applications. Specifically, for example, there is a type in which hot water is used as a liquid to be heated and used for general hot water supply and reheating of a bath. As described above, in the configuration in which a plurality of heat exchange units are provided, and the liquid to be heated passing through each heat exchange unit is heated, the liquid to be heated is not always flowing in all the heat exchange units. Depending on the state of use, the liquid to be heated flows in a part of the heat exchange unit, but the flow may stop in the other.

[0003] In such a case, since the liquid to be heated is heated by the combustion gas even in the heat exchange section where the flow is stopped, the liquid to be heated may be too hot. If the temperature of the liquid to be heated is too high, for example, when the liquid to be heated is hot or cold, an adverse effect such as generation of scale in the flow path occurs. Therefore, conventionally, in order to prevent such an adverse effect from occurring, the temperature of the liquid to be heated in the heat exchange section where the flow is stopped is detected, and the combustion of the combustion burner is performed so that the temperature does not become excessively high. It is contemplated to control the amount. In order to detect the temperature of the liquid to be heated in the heat exchange section in which the flow is stopped, if a temperature sensor is installed inside the heat exchange section to detect the temperature of the liquid to be heated, the configuration becomes complicated. However, since such a configuration is difficult due to manufacturing costs and the like, the flow path of the liquid to be heated is exposed to the outside of the heat exchange unit, not to the inside of the heat exchange unit where the flow is stopped. The temperature of the liquid to be heated is detected at the portion where the heating is performed.

[0004]

However, in the above-mentioned conventional structure, the flow of the liquid to be heated is stopped, and the liquid to be heated in the heat exchange section and the liquid to be heated at the position where the above temperature is detected are detected. A large temperature difference occurs between the liquid and the liquid, and the temperature difference fluctuates depending on the surrounding environment of the temperature detection location. Therefore, it is difficult to accurately detect the temperature of the liquid to be heated in the heat exchange section in which the flow is stopped, and the control of the combustion amount of the combustion burner becomes inaccurate. The present invention has been made in view of the above circumstances, and an object of the present invention is to appropriately prevent a temperature of a liquid to be heated in a heat exchange unit in which flow is stopped from becoming too high.

[0005]

According to the first aspect of the present invention, the liquid to be heated flows to a part of the plurality of heat exchange units, and the liquid to be heated is supplied to the other part of the plurality of heat exchange units. in some operating conditions the flow is stopped, the combustion control means for controlling the amount of combustion combustion burner, the detected temperature of the heating target liquid in output path of the heat exchange portion in which the heating target fluid flows
The higher the detected temperature, the smaller the amount of combustion
Based on the predetermined set proportional to the engagement, seeking proper combustion amount the temperature of the heating target liquid flow is present in the heat exchange unit which is stopped is below the set temperature of the heating object liquid, the The combustion burner is burned at the obtained appropriate combustion amount.

That is, the inventor of the present invention has proposed that the heat exchanging section in which the liquid to be heated is flowing and the heat exchanging section in which the flow is stopped are integrally formed so as to conduct heat mutually. Therefore, the temperature of the liquid to be heated inside the heat exchange section that has stopped flowing and the temperature of the liquid to be heated on the side of the heat exchange section that are flowing are not completely independent, and a certain correlation exists. Based on the recognition that they can exist, the relationship between the two was examined. As a result, it was experimentally confirmed that there was a certain relationship using the combustion amount of the combustion burner as a parameter. This relationship is not limited to the case where the temperature of the liquid to be heated is measured at the entrance of the heat exchange section through which the liquid to be heated flows, or the case where the temperature of the liquid to be heated is measured at the exit. Even though the relationship itself is different, it still has a certain relationship.

Therefore, the flow of the liquid to be heated is stopped by limiting the amount of combustion of the combustion burner in accordance with the temperature of the liquid to be heated at the entrance or exit of the heat exchange section through which the liquid to be heated flows. If the appropriate amount of combustion of the combustion burner is set so that the temperature of the liquid to be heated inside the heat exchange section can be reduced to the set temperature or less, the object to be heated at the entrance or exit of the heat exchange section through which the liquid to be heated flows is set. The appropriate amount of combustion of the combustion burner is determined based on the temperature of the liquid, and the combustion burner is burned with the appropriate amount of combustion, thereby causing the liquid to be heated existing inside the heat exchange unit where the flow of the liquid to be heated is stopped. Can be suppressed below the set temperature.

[0008] The temperature information of the liquid to be heated, which is the basis of the combustion control as described above, is obtained by measuring the temperature on the side where the liquid to be heated is flowing. Correspondence between the temperature of the liquid to be heated at the entrance or exit of the heat exchange section through which the liquid to be heated flows and the temperature of the liquid to be heated inside the heat exchange section where the flow is stopped Since the relationship is stabilized, it is possible to appropriately prevent the temperature of the liquid to be heated in the heat exchange unit where the flow is stopped from becoming too high.

However, the relationship between the temperature of the liquid to be heated at the entrance of the heat exchange section through which the liquid to be heated flows and the temperature of the liquid to be heated existing inside the heat exchange section where the flow is stopped is determined by It has been experimentally confirmed that the flow rate largely depends on the flow rate on the heat exchange section side where the liquid flows.Specifically, as the flow rate increases, the heating existing inside the heat exchange section where the flow is stopped The rise in the temperature of the target liquid is reduced. Therefore, it is of course possible to make the temperature of the liquid to be heated existing inside the heat exchange part where the flow is stopped be equal to or lower than the set value, but if the combustion amount is set based on the low flow side, In some cases, the combustion amount of the combustion burner may be reduced more than necessary.

[0010] On the other hand, the temperature of the liquid to be heated at the outlet of the heat exchange section through which the liquid to be heated flows becomes smaller as the flow rate increases, from the temperature of the liquid to be heated at the inlet. That is, it has the same tendency as the rise in the temperature of the liquid to be heated existing inside the heat exchange unit where the flow is stopped. For this reason, the relationship between the temperature of the liquid to be heated at the outlet of the heat exchange section through which the liquid to be heated flows and the temperature of the liquid to be heated existing inside the heat exchange section where the flow has been stopped is expressed as follows. It can be made not so dependent on the flow rate of the flowing heat exchange section .

Therefore, the heat exchange section through which the liquid to be heated flows.
Based on the detection information of the temperature of the liquid to be heated on the way out,
Execute the combustion control of the combustion burner by finding the appropriate combustion amount.
This ensures that even when the flow rate of the liquid to be heated changes,
The combustion control can be performed more efficiently. So, as above
In addition, the combustion control control means performs heat exchange in which the liquid to be heated flows.
Detection that detects the temperature of the liquid to be heated at the outlet of the section
The detected temperature of the means and the higher the detected temperature, the more the combustion burner
And a predetermined proportional relationship to reduce the amount of combustion
The appropriate combustion amount is calculated based on the
Executing baking control changes the flow rate of the liquid to be heated
In this case, accurate combustion control can be performed, and
For obtaining the appropriate combustion amount from the detection information of the temperature detection means.
Simplifies the combustion control of the combustion burner.
And can. In other words, when the flow rate of the liquid to be heated changes
However, in the detection information of the temperature of the liquid to be heated in the above-mentioned outlet,
By performing combustion control based on
And control is accurate
It is.

[0012]

[0013] Also, by providing the configuration of the second aspect, the temperature of the heating target liquid in the forward path of the heat exchange portion for circulating fluid heated detected by the temperature detecting means, based on the detection information, hot water An appropriate combustion amount at which the temperature of the hot water present inside the hot water supply heat exchanging section in which the flow of water stops is equal to or lower than the set temperature is determined, and the combustion burner is burned at the determined appropriate combustion amount. The heat exchange unit for heating the circulating fluid is a device in which the circulating fluid is circulated and heated in order to increase the temperature of the heating target unit to which the outward and return paths are connected. Generally, not so high accuracy is required for the accuracy of temperature. Therefore, there is no particular problem even if the combustion control is performed with priority given to the temperature of the hot water present inside the hot water supply heat exchange unit in which the flow of the hot water is stopped being equal to or lower than the set temperature. On the other hand, in the heat exchange unit for hot water supply, since the hot water temperature after heating needs to be stabilized to some extent because the hot water temperature is usually set and the hot water is supplied,
It is not appropriate to perform combustion control that can cause temperature change,
In addition, it is necessary to prevent the generation of scale, in particular, due to the nature of hot water supply. Therefore, when the heat exchange part for circulating fluid heating and the heat exchange part for hot water supply are integrally formed so as to conduct heat to each other, as described above, the hot water inside the heat exchange part for hot water supply It is particularly effective to control the combustion so that the temperature is equal to or lower than the set temperature.

[0014] Further, by providing the configuration of the third aspect, a plurality of heat exchanging portion are integrally formed as a heat exchanger of the fin tube type which share the heat transfer fins. Therefore, when a plurality of heat exchange units are provided, not only can the parts be shared to simplify the configuration as a whole, but also heat conduction between the plurality of heat exchange units can be performed smoothly, and the above-described combustion control can be accurately performed. Can be done.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hot water supply device with a bath reheating function as an example of a combustion type heating device according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, a combustion burner 2 in which a supplied fuel gas burns is provided in a combustion chamber 1.
And a fin tube type heat exchanger 3 for heating water as a liquid to be heated by heating the burner 2, and a lower part of the combustion chamber 1 for passing combustion air to the burner 2. A motor-driven fan 4 is provided.
An ignition igniter 5 for igniting the burner 2 and a frame rod 6 for detecting whether or not the ignition has occurred are provided near the burner 2.

In the heat exchanger 3, the water supplied from the water supply passage 7 as the entrance Li is heated to the target set temperature and the exit Lo is supplied.
A hot water supply heat exchange section N1 flowing out of the hot water supply path 8 as
The return path 9 is connected to the bathtub 18 (an example of a heating target portion) by the return path 9 as the entrance Li and the outward path 10 as the exit path Lo.
The hot water as the circulating fluid supplied from the
The additional heat exchange unit N2 as a heat exchange unit for heating the circulating liquid flowing out of the burner 2 is provided in the combustion gas passage S of the burner 2 in the longitudinal direction of the passage. In detail, FIG.
As shown in FIG. 2B, which is a cross-sectional view in the same direction as FIG. 2A and FIG. 2A, the hot-water supply heat exchange portion N1 has a U-shaped pipe 11 on both lateral sides. , And the additional heat exchange section N2 is similarly constituted by five heat absorbing pipes 13. The same heat-transfer fins 14 (hereinafter, simply referred to as “fins 14”) are attached to these heat-absorbing pipes 12 and 13, respectively, and a hot-water supply heat exchange section N 1 and a reheating heat exchange section N 2 are provided. And the fins 14 are commonly used, and each of the heat-absorbing pipes 13 constituting the additional heat exchange section N2 is one of the nine heat-absorbing pipes 12 constituting the hot-water supply heat exchange section N1. Of 5
The book and the pipes are arranged so as to contact each other along the longitudinal direction. Thus, the hot water supply heat exchange section N
The configuration is such that the hot water and the hot water in the additional heat exchange section N2 easily conduct heat to each other.

A ratio of a bypass 15 for supplying water from the water supply channel 7 to the hot water supply channel 8 by bypass, a hot water supply amount from the hot water supply heat exchange section N1, and a bypass amount from the bypass 15 to the hot water supply passage 8 And a mixing valve 16 as mixing ratio adjusting means capable of changing and changing the temperature of the hot water. The hot water mixed by the mixing valve 16 is supplied to a hot water tap (not shown) through a hot water supply path 17 or Alternatively, the hot water is supplied to the bath 18 as a heating target. The water supply channel 7 is provided with an incoming water temperature thermistor 19 for detecting the incoming water temperature and a water amount sensor 20 for detecting the amount of water flow. An outlet hot water thermistor 21 for detecting the temperature of hot water discharged from the hot water supply heat exchange unit N1 is provided. The hot water supply path 17 is provided with a hot water supply temperature thermistor 22 for detecting the temperature of the mixed hot and cold water,
And a water proportional valve 23 for suppressing the amount of water when the heating capacity is exceeded, and the amount of water flowing through the hot water tap to detect that the hot water tap has been opened during hot water supply to the bathtub 18 is equal to or more than a set amount. Interrupt sensor 24 for detecting whether or not
Are provided respectively. Also, the fuel supply path G to the burner 2
Is provided with a source gas solenoid valve 25, a gas proportional valve 26 for changing and adjusting the fuel supply amount, and three switching valves 27 for switching the fuel supply state to the burner 2.

In the return path 9 in the additional heating circulation path, a constant discharge type circulation pump 28 for circulating and flowing hot and cold water, a water flow switch 29 which is turned on when it detects that there is more water than a set amount, A hot water thermistor 30 for detecting the temperature of hot and cold water, a two-way bath valve 31, a water level sensor 32 for detecting the water level in the bathtub 18, a water flow control valve 33 capable of changing and adjusting the circulating flow amount, and the like. Further, the outbound path 10 is provided with an outbound path temperature thermistor 34 as temperature detecting means TS for detecting the temperature of the hot water in the outbound path 10 after being heated in the additional heat exchange unit N2. This outbound hot water temperature thermistor 3
4 is a heat absorption pipe 1 in the outward path 10 as shown in FIG.
It is installed in three places. In FIG. 3, a part of the hot water supply heat exchange unit N1 is schematically illustrated with a part omitted to make it easier to see the additional heat exchange unit N2. An intermediate position between the bath two-way valve 31 and the water flow control valve 33 on the outward path 10 and an intermediate position on the return path 9 are connected via a reheating bypass path 40 having a bypass two-way valve 35, and each of the outward path 10 and the return path 9. Is connected to the inside of the bathtub 18 via a bath adapter. In other words, with the bypass two-way valve 35 closed, each of the forward path 10, the return path 9, and the additional heat exchange unit N2 forms a circulation path for additional heating that allows the hot and cold water in the bathtub 18 to circulate and flow. become.

The hot water supply path 17 is branched into a general hot water supply path 17a from a middle part thereof to a hot water tap and a hot water supply path 17b for a bath. The hot water supply path 17b is provided with a hot water filling electromagnetic valve 36 and a backflow prevention valve. The hopper 37 and the check valve 38 are connected to the additional heating circulation path. Reference numeral 39 in the figure denotes a drain solenoid valve for discharging the remaining hot water in the hopper 37.

The hot water supply apparatus operates on the basis of a manual operation command, such as an operation command such as a general hot water supply operation, a bath hot water supply (filling the bath tub 18), a bath reheating operation, and a target hot water supply temperature. A remote control operation unit R for giving a temperature command and a control unit H for controlling the operation of each unit of the water heater in accordance with the command information of the remote control operation unit R are provided. The control unit H includes a microcomputer, and receives detection information of the thermistors and sensors, and based on the detection information, controls the combustion state of the burner 2, the valves for water flow control, and the like. The operation state of the mixing valve 16 and the like is controlled. Therefore, the control unit H
It functions as combustion control means BC for controlling the combustion amount of the burner 2. In addition, when the interrupt sensor 24 detects that the hot water tap is opened during the hot water filling operation,
The hot water filling operation is temporarily suspended, and the hot water supply operation is preferentially executed. In addition, when either the hot water filling operation or the hot water supply operation and the reheating operation are instructed, they are simultaneously executed in parallel.

Next, the hot water flows into a part of the heat exchange unit N1 for hot water supply and the heat exchange unit N2 for the additional heating, and the other one is in a partial operation state in which the flow of the hot water is stopped. The control operation of the control unit H when performing independent operation of hot water supply, hot water filling, or additional heating will be schematically described.

[Hot Water Supply Operation] When the water flow is detected by the water amount sensor 20 after the water supply operation is commanded in the remote control operation section R and the control is started, the ignition operation of the burner 2 is executed. That is, the ventilation by the fan 4 is started, the source gas solenoid valve 25, the switching valve 27, and the gas proportional valve 26 are each opened to supply the fuel gas to the burner 2, and the igniter 5 starts the ignition operation. To ignite burner 2. When ignition is confirmed by the flame rod 6, the ignition operation of the igniter 5 is stopped. After the ignition, the combustion control by the burner 2 is executed so that the detected value of the outlet hot water temperature thermistor 21 becomes a preset temperature (for example, 60 ° C.). Along with the combustion control of the burner 2, the mixing valve 16 is controlled such that the detected value of the hot water supply temperature thermistor 22 becomes the hot water mixing ratio that becomes the target hot water supply temperature instructed by the remote control operation unit R.

When the filling operation is instructed, the filling water solenoid valve 36, the bath two-way valve 31 and the bypass two-way valve 35 are opened, and the water flow control valve 33 is fully opened. The water flow is started by adjusting
When the detected value exceeds the set amount, the combustion control of the burner 2 similar to the hot water supply operation is executed, and the detected value of the hot water supply temperature thermistor 22 becomes the target filling temperature separately instructed by the remote controller R. The mixing valve 16 is controlled so as to achieve the ratio. Hot water supplied from the bath hot water supply path 17 passes through a hopper 37, a check valve 38, and a circulation pump 28, and passes from the outward path 10 where the bath two-way valve 31 is provided to the bathtub 18.
, And also supplied from the return path 9 through the additional heating bypass path 40 provided with the bypass two-way valve 35,
Hot water can be efficiently supplied from two routes. When the water level of the bathtub 18 detected by the water level sensor 32 reaches the target water level, the hot water supply is stopped.

[Reheating Operation] When the reheating operation is commanded in a state where the flow of water to the hot water supply heat exchange unit N1 is stopped, a partial operation state is established, as shown in the flowchart of FIG.
The bath two-way valve 31 is opened, the bypass two-way valve 35 is closed, and the water flow control valve 33 is controlled to fully open (a maximum opening degree or a large opening degree close thereto) (step #).
1). Then, when the circulation pump 28 is operated and the water flow switch 29 is turned on in accordance with the start of the circulation flow, the combustion operation of the burner 2 as described above is started, and the reheating heat exchange unit N2 starts the forward passage 10. Is heated (steps # 3, 4, 5).

In the combustion control at this time, the control unit H
Takes in the detected temperature of the outgoing hot water temperature thermistor 34, determines the appropriate combustion amount of the burner 2 from the relationship between the combustion amount and the temperature shown in FIG. Set the amount of combustion (Step # 6,
7). The relationship shown in FIG. 5 is a preset proportional relationship in which the combustion amount decreases as the detected temperature increases. Therefore, the relationship of FIG. 5 can be stored not as a large number of sets of data of the detected temperature and the combustion amount but as a linear function formula, so that the required storage capacity can be saved and the control configuration can be reduced. This can contribute to simplification. When the detected temperature of the return path hot water thermistor 30 reaches the target set temperature,
Until the bath temperature reaches the desired temperature (Step # 8)
The above combustion amount setting is repeated (steps # 6 and # 7),
When the target temperature is reached, the reheating is completed.

Next, the basis for determining the relationship shown in FIG. 5, which is used for obtaining the appropriate combustion amount of the burner 2 as described above, will be described. When the temperature of the hot water existing inside the hot water supply heat exchange unit N1 in which the flow of the hot water is stopped is 95 ° C. by the heat exchanger 3 of the present embodiment, the burner 2
FIG. 6 shows data obtained by measuring the relationship between the amount of combustion of the hot water and the temperature detected by the outward hot-water temperature thermistor 34 using the flow rate of the additional heating circulation path as a parameter. As is clear from FIG. 6, the relationship between the detected temperature of the outbound hot-water temperature thermistor 34 and the amount of combustion does not depend so much on the flow rate of the circulation path for additional heating. Therefore, based on the data in FIG. 6, the temperature of the water existing inside the hot water supply heat exchange unit N1 in which the flow of the hot water is stopped is 95 ° C. as the set temperature (strictly, the set temperature is 9 ° C.).
(A temperature slightly higher than 5 ° C.) or less, and the relationship shown in FIG. 5 which does not depend on the flow rate of the circulation path for reheating is determined as a value for obtaining an appropriate combustion amount so as not to excessively decrease the combustion amount. It is set. Even if the shape and the like of the heat exchanger 3 are changed, the relationship of FIG. 5 corresponding to the heat exchanger 3 can be set in advance in the same manner as described above.

When the appropriate combustion amount is obtained based on the relationship shown in FIG. 5 and the combustion amount of the combustion burner is controlled, the time change of the temperature of the hot water present inside the hot water supply heat exchange section N1 is as follows.
As shown in FIG. 7, it is confirmed that the temperature is controlled stably below the set temperature. Incidentally, FIG. 7 illustrates an example in which the reheating operation is performed with the flow rate of the reheating circuit being fixed at 6 liters / minute, but the flow rate of the reheating circuit is optionally set by the user. Even when control is performed to change the flow rate of the additional heating circulation path in accordance with the deviation between the detected temperature of the return water temperature thermistor 30 and the target set temperature, the forward water temperature thermistor The temperature of the hot water present inside the hot water supply heat exchange unit N1 is accurately controlled to be equal to or lower than the set temperature by obtaining the appropriate combustion amount from the relationship shown in FIG.

[Other Embodiments] Other embodiments will be listed below. In the above embodiment , the tank 18 is a heating object as a heat exchange unit for heating the circulating liquid.
The example of the heat exchange section for reheating the bath as a section was
For example, a heat exchanger for heating is set
As a configuration to circulate heated water to the target part
Is also good. In such a case, the liquid to be heated must be hot water.
It is not necessary, use a special liquid catalyst instead of hot water
You may.

In the above embodiment,Heat exchange unit for hot water supply
The heat transfer fin 14 is shared by the heat exchange portion N2 and the additional heat exchange portion N2.
As a fin tube type heat exchanger 3 used
However, the heat exchange unit N1 for hot water supply and the heat exchange unit N2 for additional heating
Are provided with fins for heat absorption separately, and each heat exchange portion N1,
Heat exchange only by contact of the heat absorbing pipes 12 and 13 of N2
The parts N1 and N2 may conduct heat with each other.
Use other types of heat exchangers other than fin tubes.
May be.

[0030]

[0031]

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a water heater according to an embodiment of the present invention.

FIG. 2 is a side view showing the heat exchanger according to the embodiment of the present invention.

FIG. 3 is a front view showing the heat exchanger according to the embodiment of the present invention;

FIG. 4 is a flowchart according to the embodiment of the present invention.

FIG. 5 is a diagram showing control information at the time of reheating operation according to the embodiment of the present invention.

FIG. 6 is a view showing measurement data according to the embodiment of the present invention;

FIG. 7 is an explanatory diagram of a control result according to the embodiment of the present invention.

[Explanation of symbols]

 2 Combustion burner BC Combustion control means N1, N2 Heat exchange section TS Temperature detection means

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tetsuji Morita 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Shigenobu Okuda 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2-2 Inside Osaka Gas Co., Ltd. (72) Inventor Yu Enomoto 1-152 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Prefecture In-house Herman Co., Ltd. (72) Hirosho Imaida 1-1-Oka, Minami-shi, Minato-ku, Osaka, Osaka No.1-252 Harman Co., Ltd. (72) Shingo Yonezawa, Inventor Shingo Yonezawa 1-1-1 Oka, Minami-shi, Minato-ku, Osaka City, Osaka Prefecture 1-52 Harmony Co., Ltd. No. 52 Harman Co., Ltd. (72) Inventor Daisuke Konishi 1-152 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Harman Co., Ltd. (56) References -98151 (JP, A) JP flat 4-295542 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) F24H 1/10 F23N 5/02

Claims (3)

(57) [Claims] 1. A combustion burner in which a plurality of heat exchanging portions which are heated while flowing a liquid to be heated supplied from an inlet and flow out to an outlet are integrally formed so as to conduct heat mutually. A combustion-type heating device provided in a combustion gas flow path, wherein supply of a liquid to be heated to each of the plurality of heat exchange units is configured to be intermittently separately performed, and a combustion amount of the combustion burner. The combustion control means for controlling the flow of the liquid to be heated flows to a part of the plurality of heat exchange units, and in some other operating states in which the flow of the liquid to be heated is stopped in other parts, and the temperature detected by the temperature detection means for heating the target fluid to detect the temperature of the heating target liquid in output path of the heat exchange section to flow, the test
It is predetermined that the higher the outlet temperature, the smaller the combustion amount.
Based on the set proportional relationship obtained above, a proper combustion amount at which the temperature of the liquid to be heated existing inside the heat exchange section where the flow of the liquid to be heated is stopped becomes equal to or lower than the set temperature is determined. A combustion type heating device configured to burn the burner. 2. The method according to claim 1, wherein one of the plurality of heat exchanging sections is an input section.
The part to be heated by the return path as the road and the outward path as the departure path
Connected to the circulating fluid supplied from the return
A heat exchange section for heating the circulating fluid flowing out
However, it heats the water from the irrigation canal as an ingress
A heat exchange section for supplying hot water to all of the hot water supply paths, wherein the combustion control means circulates through the heat exchange section for heating the circulating fluid.
A state in which the recirculation fluid flows and does not pass through the heat exchange unit for hot water supply
Is set to the partial operation state and the heat exchange section for hot water supply is
The appropriate combustion amount at which the temperature of the hot and cold water falls below the set temperature
Seeking to control the combustion of said combustion burner.
Combustion type heating device according to claim 1 being. 3. The heat exchange section includes a plurality of heat transfer fins.
The combustion-type heating device according to claim 1 or 2 , comprising a fin tube type heat exchanger used.