JP3731942B2 - Hot water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a heating heater for heating a heating heat exchanger, a hot water heater for heating a hot water heat exchanger, and a common control unit for controlling the heating value of the heating heater and the hot water heater. A heat generation amount control means, and circulation means for circulating the heating heat medium in a circulation path extending between the heating heat exchanger and the heating terminal, and the heat generation amount control means includes the heat exchange for heating. When heating the water heater and the hot water supply heat exchanger at the same time, the heating amount of the heating heater and the hot water supply heating device are controlled so that the hot water supply temperature by the hot water supply heat exchanger becomes the target hot water supply temperature. It is related with the hot-water supply heating apparatus comprised as follows.
[0002]
[Prior art]
The hot water heater / heater described above has an advantage that the control structure can be simplified because the heating value of the heating device for heating and the heating device for hot water supply are controlled by a common heating value control means. When heating the heat exchanger for heating at the same time, the heating value of the heating device for heating and the heating device for hot water supply is controlled so that the hot water supply temperature by the hot water supply heat exchanger becomes the target hot water supply temperature. As a result, the heating medium with the expected temperature corresponding to the target hot water supply temperature circulates between the heating heat exchanger and the heating terminal.
[0003]
[Problems to be solved by the invention]
For this reason, when the heat exchanger for heating and the heat exchanger for hot water supply are heated at the same time, there is a possibility that the heating medium having a temperature outside the predetermined temperature at which the circulation path and the heating terminal can be properly used circulates. If the temperature of the heating heat medium is lower than the predetermined temperature, the heat dissipation efficiency of the heating terminal is likely to decrease.If the temperature of the heating heat medium is higher than the predetermined temperature, the circulation path and The heating terminal is liable to be damaged, and for example, when the heating terminal is a floor heating device, there is a drawback that the temperature of the floor surface becomes too high.
In addition, when the heating medium circulating through the circulation path is configured to stop the operation of the heating apparatus when the temperature exceeds a predetermined temperature, the heating medium having a high temperature with a small heating load is provided. When it circulates, since there is little temperature fall of the heating heat medium in a heating terminal, there exists a possibility that the operation stop operation and operation start operation of a heating apparatus for heating may be repeated frequently.
The present invention has been made in view of the above circumstances, and by devising the circulation structure of the heating medium for heating, even when the heating heat exchanger and the hot water supply heat exchanger are heated at the same time, the present invention is appropriate. It aims at making it easy to circulate the heating medium for temperature heating.
[0004]
[Means for Solving the Problems]
The hot water supply and heating device according to claim 1 is:
When the heating heat exchanger and the hot water supply heat exchanger are heated at the same time, and the temperature of the heating medium is higher than a predetermined temperature, the amount of heat released per unit time in the heating terminal of the heating medium When the temperature of the heating medium is higher than the predetermined temperature and the temperature of the heating medium is lower than the predetermined temperature, the amount of heat radiation per unit time in the heating terminal of the heating medium is used for heating. An adjusting means is provided for adjusting the supply state of the heating medium to the heating terminal so that the temperature of the heating medium is lower than the predetermined temperature, so that the temperature of the heating medium is lower than the predetermined temperature. Is higher, it is easy to lower the temperature of the heating medium returning to the heating heat exchanger. When the temperature of the heating medium is lower than the predetermined temperature, the heating medium returning to the heating heat exchanger Temperature drop can be suppressed.
Therefore, by adjusting the amount of heat radiation per unit time of the heating medium in the heating terminal, it is possible to suppress an increase in temperature exceeding the predetermined temperature of the heating medium or a decrease in temperature below the predetermined temperature of the heating medium. Even when the heat exchanger for heating and the heat exchanger for hot water supply are heated at the same time, it is easy to circulate a heating medium having a proper temperature.
[0005]
The hot water supply and heating device according to claim 2 is:
The adjustment means
When the temperature of the heating medium is higher than the predetermined temperature, the amount of circulating heating medium per unit time in the circulation path is increased more than when the temperature of the heating medium is the predetermined temperature, and the heating heat exchanger The heating medium in the heating terminal is kept at a high temperature state that facilitates heat radiation while reducing the temperature rise of the heating medium before and after passing through the heating terminal, and the temperature of the heating medium is higher than a predetermined temperature. When the temperature of the heating medium is low, the heating medium circulation rate per unit time in the circulation path is decreased as compared with the case where the temperature of the heating medium is a predetermined temperature, and the temperature of the heating medium before and after passing through the heating heat exchanger. While increasing the rise, the heating medium in the heating terminal is maintained in a low temperature state in which heat dissipation is easily suppressed, and the supply state of the heating medium to the heating terminal is adjusted. Therefore, the arrangement of the circulation path of the heating medium is specially changed. In Rukoto no simple, a drop below a predetermined temperature rise and the thermal heating medium exceeds a predetermined temperature of the heating heat medium can be suppressed.
[0006]
The hot water supply / room heating device according to claim 3 is:
The adjusting means branches the circulation path from the heating heat exchanger to the heating terminal, and provides a reflux path for returning a part of the heating medium to the heating heat exchanger without passing through the heating terminal. When the temperature of the heating medium is higher than the predetermined temperature, the flow rate of the heating medium flowing into the reflux path is decreased as compared with the case where the temperature of the heating medium is the predetermined temperature. Is lower than the predetermined temperature, the flow rate of the heating medium flowing into the reflux path is increased more than when the heating medium is at the predetermined temperature, so that the heating medium is supplied to the heating terminal. Therefore, when the temperature of the heating medium is higher than the predetermined temperature, the flow rate of the heating medium supplied to the heating terminal is the same as the temperature of the heating medium. The amount of heat dissipated by the heating medium in the heating terminal increases and the temperature of the heating medium increases. When the temperature is lower than the constant temperature, the flow rate of the heating medium supplied to the heating terminal is less than the temperature of the heating medium when the heating medium is at a predetermined temperature. Decrease.
Therefore, it is possible to easily suppress a rise in temperature exceeding the predetermined temperature of the heating medium or a decrease below the predetermined temperature in the heating medium without changing the heating medium circulation amount per unit time in the circulation path. .
[0007]
The hot water supply and heating device according to claim 4 is:
When the adjusting means decreases the flow rate of the heating medium flowing into the reflux path as compared with the case where the temperature of the heating medium is a predetermined temperature, the flow rate of the heating medium passing through the heating heat exchanger is decreased to the predetermined temperature. Therefore, when the temperature of the heating medium is higher than a predetermined temperature, the flow rate of the heating medium supplied to the heating terminal is further increased. The amount of heat released from the heating heat medium in the heating terminal is further increased, and the temperature rise of the heating heat medium before and after passing through the heating heat exchanger is reduced.
Further, if the flow rate of the heating medium flowing into the reflux path is increased as compared with the case where the temperature of the heating medium is a predetermined temperature, the flow rate of the heating medium passing through the heating heat exchanger is increased to a predetermined temperature. Therefore, when the temperature of the heating medium is lower than a predetermined temperature, the flow rate of the heating medium supplied to the heating terminal is further reduced, and the heating terminal The amount of heat released from the heating medium in the machine is further reduced, and the temperature of the heating medium before and after passing through the heating heat exchanger increases.
Therefore, the rise exceeding the predetermined temperature of the heating medium or the decrease below the predetermined temperature of the heating medium can be effectively suppressed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
FIG. 1 shows a system configuration of a hot water supply and heating device, a heat exchanger 1 for heating, a gas combustion type heating burner 2 as a heating device for heating the heating heat exchanger 1, and heat exchange for hot water supply. A gas-fired hot-water supply burner 4 as a hot-water supply heating device for heating the hot-water supply heat exchanger 3, a heating-heat exchanger 1, a bathroom heater and a floor A hot water circulation path 8 that circulates over a heating terminal 7 such as a heater, a controller 5 that controls the operation of the hot water heater and a remote controller 6 that operates the controller 5 are provided.
[0009]
The hot water supply heat exchanger 3 is connected to a water supply passage 9 that is connected to a general household water pipe and supplies water for heating, and a hot water supply passage 10 that supplies hot water after heating. And the hot water supply passage 10 are connected via a bypass passage 11 in a state of bypassing the hot water supply heat exchanger 3, and the water of the water supply passage 9 is supplied to the hot water from the hot water supply heat exchanger 3 in the bypass passage 11. A bypass valve 11a for mixing is provided.
[0010]
The water supply passage 9 is provided with a water thermistor 9a for detecting the temperature of water entering the hot water supply heat exchanger 3 and a water amount sensor 9b for detecting the amount of water flow. The water supply passage 10 is provided with a heat exchanger 3 for hot water supply. And a hot water supply thermistor 10b for detecting the temperature of the hot water after the water is mixed by the operation of the bypass valve 11a on the downstream side of the connection place with the bypass passage 11 are provided. It has been.
[0011]
The heating heat exchanger 1, the heating burner 2, the hot water supply heat exchanger 3, and the hot water supply burner 4 are provided in one common combustion chamber 13 having a combustion fan 12 for supplying combustion air, The original gas supply path 14 is branched into a heating gas supply path 2a and a hot water supply gas supply path 4a, and is connected to the heating burner 2 and the hot water supply burner 4, and the original gas supply path 14 includes fuel. An original gas solenoid valve 14a and an original gas proportional valve 14b for intermittently supplying gas are provided, and a heating gas electromagnetic valve 2b for intermittently supplying fuel gas to the heating burner 2 is provided in the heating gas supply path 2a. The hot water supply gas supply passage 4a is provided with a hot water supply solenoid valve 4b for intermittently supplying fuel gas to the hot water supply burner 4. Each of the heating burner 2 and the hot water supply burner 4 has an igniter for ignition. And frame rod to detect ignition Etc. is provided [0012]
The hot water circulation path 8 includes a heating forward pipe 8a that supplies warm water from the heating heat exchanger 1 to the heating terminal 7, and a heating return pipe 8b that returns the hot water that has passed through the heating terminal 7 to the heating heat exchanger 1. In addition, the middle part of the heating return pipe 8a and the middle part of the heating return pipe 8b are connected by a bypass pipe 8c.
[0013]
A heating thermistor 8d that detects the temperature A discharged from the hot water that has passed through the heating heat exchanger 1 is provided upstream of the connection point of the heating forward pipe 8a with the bypass pipe 8c. A water distribution valve 8e capable of adjusting the distribution ratio of the hot water supplied from the heating heat exchanger 1 to the bypass pipe 8c side by the electric motor M is provided at the connection point with the pipe 8c, and the heating return pipe 8b An expansion tank 8f and a circulation pump P as a circulation means for circulating hot water are provided on the downstream side of the connection point with the bypass pipe 8c.
[0014]
Therefore, the bypass pipe 8c is provided by branching the hot water circulation path 8 from the heating heat exchanger 1 to the heating terminal 7, so that a part of the circulating hot water does not pass through the heating terminal 7 for heating. A reflux path for refluxing the heat exchanger 1 is configured.
[0015]
FIG. 2 shows the operation characteristics of the water amount distribution valve 8e. At one end L of the adjustment range, the amount of water flow per unit time (total hot water circulation amount) of the heating heat exchanger 1 is the smallest and the bypass piping 8c side is reached. Is set so that the flow rate per unit time (total hot water circulation rate) increases and the distribution rate to the bypass pipe 8c side decreases as the other end R of the adjustment range approaches the other end R. Has been.
[0016]
FIG. 3 shows a control block diagram of the hot water supply and heating device. The controller 5 receives input information from the remote control 6, the heating terminal 7, the incoming water thermistor 9a, the potted thermistor 10a, the hot water thermistor 10b, the heating thermistor 8d, and the water amount sensor 9b. The control unit 5a that calculates necessary control data based on the above, the hot water supply combustion control unit 5b that controls the combustion operation of the hot water supply burner 4, and the operation of the original gas proportional valve 14b are controlled to adjust the supply gas amount. Gas amount control unit 5c, heating combustion control unit 5d for controlling the combustion operation of the heating burner 2, and water amount for adjusting the distribution ratio of the circulating hot water to the bypass pipe 8c side by controlling the operation of the water amount distribution valve 8e A distribution control unit 5e is provided.
[0017]
The hot water supply combustion control unit 5b operates the hot water supply burner 4 when a hot water supply command is input from the remote controller 6, and stops the combustion operation of the hot water burner 4 when a hot water stop command is input from the remote control 6. To control.
Further, when a heating command from the heating terminal 7 or a heating burner combustion command from the liquid heat exchanger control unit 5e is input, the heating combustion control unit 5d causes the heating burner 2 to perform a combustion operation, thereby heating When a heating stop command from the terminal 7 or a heating burner combustion stop command from the liquid heat exchanger controller 5e is input, control is performed to stop the combustion operation of the heating burner 2 and the combustion operation is in progress. When the discharge temperature A of the circulating hot water input from the heating thermistor 8c exceeds the predetermined temperature range B, the combustion operation is controlled to stop until the discharge temperature A reaches the predetermined temperature range B.
[0018]
When only the heating heat exchanger 1 is heated, the gas amount control unit 5c adjusts the opening degree of the original gas proportional valve 14b so that the temperature of the circulating hot water is within the predetermined temperature range B, thereby exchanging heat for hot water supply. When only the heater 3 is heated, the opening degree of the original gas proportional valve 14b is adjusted so that the hot water supply temperature becomes the target hot water supply temperature, the combustion command of the heating burner 2 from the heating terminal 7 and the hot water supply from the remote control 6 When the combustion command of the burner 4 is input simultaneously and both the heating heat exchanger 1 and the hot water supply heat exchanger 3 are heated simultaneously, the hot water supply temperature by the hot water supply heat exchanger 3 becomes the target hot water supply temperature. In this way, the amount of heat generated by the hot water supply burner 4 and the heating burner 2 is controlled by adjusting the opening of the original gas proportional valve 14b.
Therefore, the gas amount control unit 5 c is configured as a common heat generation amount control means for controlling the heat generation amounts of the heating burner 2 and the hot water supply burner 4.
[0019]
Next, the control operation by the water amount distribution control unit 5e will be described with reference to the flowchart of FIG.
Whether there is a hot water supply command input from the remote controller 6 in a state where a heating command is input from the heating terminal 7 or whether there is a heating command from the heating terminal device 7 in a state where a hot water supply command is input from the remote control 6 Based on this, it is determined whether or not both of the heating heat exchanger 1 and the hot water supply heat exchanger 3 are heated at the same time (# 1), and when they are heated at the same time, the detection information of the heating thermistor 8d is detected. It is determined whether or not the hot water discharge temperature A exceeds a predetermined temperature range B (# 2), and if it does not exceed the predetermined temperature range B, it is determined whether it is below the predetermined temperature range B or not. (# 4).
[0020]
When the discharge temperature A exceeds the predetermined temperature range B, the water flow distribution valve 8e is increased in the water flow rate (total hot water circulation rate) of the heating heat exchanger 1 from the present, and the bypass pipe 2c is adjusted to the R side of the distribution ratio adjustment range shown in FIG. 2 so that the distribution ratio to the 8c side is lower than the present (# 3), and the total amount of hot water circulating through the heating heat exchanger 1 is increased. At the same time, the amount of warm water distributed to the heating terminal 7 is increased, so that the temperature of warm water returning to the heating heat exchanger 7 is lowered to lower the temperature A of the warm water.
[0021]
In addition, when the discharge temperature A is lower than the predetermined temperature range B, the water flow distribution valve 8e has a reduced water flow rate (total hot water circulation rate) of the heating heat exchanger 1 than the present, and bypass piping. The distribution ratio to the 8c side is adjusted to the L side of the distribution ratio adjustment range shown in FIG. 2 (# 5) so that the distribution ratio to the current side becomes higher (# 5), thereby reducing the total amount of hot water circulating through the heating heat exchanger 1 At the same time, the amount of warm water distributed to the heating terminal 7 is reduced, so that the temperature of warm water returning to the heat exchanger 7 for heating is increased to raise the temperature A of the warm water.
[0022]
Accordingly, when the water amount distribution control unit 5e is in a state where the heating heat exchanger 1 and the hot water supply heat exchanger 3 are heated at the same time, the temperature of the hot water as the heating heat medium is higher than a predetermined temperature. The flow rate of the warm water flowing into the bypass pipe 8c is decreased as compared with the case where the temperature of the warm water is a predetermined temperature, and the heat radiation amount per unit time in the heating terminal 7 is compared with the case where the temperature of the warm water is a predetermined temperature. When the temperature of the hot water as the heating heat medium is lower than the predetermined temperature, the flow rate of the hot water flowing into the bypass pipe 8c is increased more than that when the temperature of the hot water is the predetermined temperature, and the hot water heating terminal It is comprised by the adjustment means 15 which adjusts the supply state of the warm water to the heating terminal 7 so that the heat dissipation amount per unit time in the machine 7 may be reduced as compared with the temperature of the warm water being a predetermined temperature.
[0023]
Further, as shown in the operation characteristic of the water amount distribution valve 8e, the water amount distribution control unit 5e reduces the flow rate of the hot water flowing into the bypass pipe 8c when the temperature of the hot water is lower than the predetermined temperature. The flow rate of the warm water passing through the exchanger 1, that is, the total circulating amount of warm water is increased as compared with the case where the warm water having a predetermined temperature is supplied, and the flow rate of the warm water flowing into the bypass pipe 8c is set within the predetermined temperature range B. When the temperature is increased as compared with the above, the flow rate of the hot water passing through the heating heat exchanger 1 is reduced as compared with the case where the hot water having a predetermined temperature is supplied.
[0024]
[Second Embodiment]
Instead of the water amount distribution valve 8e shown in the first embodiment, as shown in FIG. 5, the water flow rate (total hot water circulation amount) per unit time of the heating heat exchanger 1 is constant over the entire adjustment range. The distribution ratio to the bypass pipe 8c side is the highest at one end L of the adjustment range, and the distribution ratio to the bypass pipe 8c side becomes lower as it approaches the other end R of the adjustment range. May be provided.
[0025]
In this case, when the discharge temperature A exceeds the predetermined temperature range B, the water amount distribution control unit 5e is configured so that the distribution ratio of the water amount distribution valve 8e to the bypass pipe 8c side becomes lower than the present. The distribution ratio adjustment range shown in FIG. 5 is adjusted to the R side, the amount of hot water distributed to the heating terminal 7 is increased, and the temperature of the warm water returning to the heating heat exchanger 7 is lowered to reduce the temperature of the warm water. When A is lowered and the discharge temperature A is lower than the predetermined temperature range B, the distribution ratio shown in FIG. 5 is set so that the distribution ratio of the water distribution valve 8e to the bypass pipe 8c is higher than the present ratio. By adjusting to the L side of the adjustment range, the amount of hot water distributed to the heating terminal 7 side is reduced, so that the temperature of the hot water returning to the heating heat exchanger 7 is increased to raise the hot water discharge temperature A. It is constituted as follows.
Other configurations are the same as those of the first embodiment.
[0026]
[Third Embodiment]
FIG. 6 shows another embodiment of the hot water supply and heating device. Instead of the bypass pipe 8c and the water amount distribution valve 8e shown in the first embodiment, a flow rate adjustment valve 8g that can be adjusted by the electric motor M is provided in the heating forward pipe 8a. At the same time, as shown in the block diagram of FIG. 7, instead of the water amount distribution control unit 5e shown in the first embodiment, a flow rate control unit 5f for controlling the adjustment operation of the flow rate adjustment valve 8g is provided. .
[0027]
The control operation by the flow rate control unit 5f will be described with reference to the flowchart of FIG.
As in the first embodiment, it is determined whether or not the heating heat exchanger 1 and the hot water supply heat exchanger 3 are heated at the same time (# 11). It is determined from the detection information of the thermistor 8d whether or not the temperature A of the hot water exceeds the predetermined temperature range B (# 12). If the temperature does not exceed the predetermined temperature range B, is it below the predetermined temperature range B? It is determined whether or not (# 14).
[0028]
Then, when the discharge temperature A exceeds the predetermined temperature range B, the flow rate control valve 8g is operated so that the water flow amount (warm water circulation amount) of the heating heat exchanger 1 is increased more than the present (# 13). ) If the temperature at the outlet A is below the predetermined temperature range B, the flow rate control valve 8g is operated so that the amount of water flow (warm water circulation amount) of the heating heat exchanger 1 is smaller than the present (# 15). ).
Other configurations are the same as those of the first embodiment.
[0029]
Therefore, when the flow rate control unit 5f is heating the heating heat exchanger 1 and the hot water supply heat exchanger 3 at the same time and the temperature of the hot water as the heating heat medium is higher than a predetermined temperature, When the temperature of the hot water is increased to be higher than that when the temperature of the hot water is lower than the predetermined temperature and the temperature of the hot water is lower than the predetermined temperature, the amount of hot water circulated per unit time in the hot water circulation path 8 is increased. It is comprised in the adjustment means 15 which adjusts the supply state of the warm water to the heating terminal 7 by reducing the temperature of the warm water from the predetermined temperature.
[0030]
[Other Embodiments]
1. The hot water supply and heating apparatus provided in the combustion chamber from which the heating burner as a heating apparatus for heating and the hot water supply burner as a heating apparatus for hot water supply are mutually different may be sufficient.
2. It may be a hot water heater / heater configured so that the heating device for heating and the heating device for hot water supply are shared by a single heating device.
3. The heating device for heating and the heating device for hot water supply may be electrically heated, and the type of the heating heat source is not particularly limited.
4). The heat exchanger for heating and the heat exchanger for hot water supply may be integrally fixed to each other through a large number of fins, for example.
5. The heating medium may be brine.
6). The kind of heating terminal is not limited.
[Brief description of the drawings]
FIG. 1 is a block diagram of a hot water supply and heating device. FIG. 2 is a graph showing a relationship between a distribution ratio adjustment range and a circulating amount of hot water. FIG. 3 is a block diagram. FIG. 4 is a flowchart. Graph showing the relationship between the adjustment range and the amount of hot water circulated [FIG. 6] FIG. 7 is a block diagram of the hot water supply and heating device of the third embodiment. FIG. 7 is a block diagram of the third embodiment. Explanation of]
DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 for heating Heating device 3 for heating Hot water exchanger 4 for hot water supply Heating device 5c for hot water supply Heat generation amount control means 7 Heating terminal 8 Circulation path 8c Recirculation path 15 Control means A Heating medium temperature B Predetermined temperature P Circulation means

Claims (4)

A heating device for heating a heating heat exchanger;
A hot water supply heating device for heating the hot water supply heat exchanger;
A common calorific value control means for controlling the calorific value of the heating device for heating and the heating device for hot water supply;
Circulation means for circulating a heating medium in a circulation path extending between the heating heat exchanger and the heating terminal is provided,
When the heating heat exchanger and the hot water supply heat exchanger are heated at the same time, the heating value control means is configured so that the hot water supply temperature by the hot water supply heat exchanger becomes a target hot water supply temperature. And a hot water supply and heating device configured to control the amount of heat generated by the heating device for hot water supply,
When the heating heat exchanger and the hot water supply heat exchanger are heated at the same time, and the temperature of the heating heat medium is higher than a predetermined temperature, the heating heat medium per unit time in the heating terminal When the temperature of the heating medium is increased than when the temperature of the heating medium is lower than the predetermined temperature, and the temperature of the heating medium is lower than the predetermined temperature, the amount of heat released per unit time in the heating terminal of the heating medium is increased. A hot water supply and heating apparatus provided with an adjusting means for adjusting a supply state of the heating heat medium to the heating terminal so that the temperature of the heating heat medium is decreased as compared with a predetermined temperature. The adjusting means comprises:
When the temperature of the heating heat medium is higher than a predetermined temperature, the heating medium circulation amount per unit time in the circulation path is increased more than when the temperature of the heating heat medium is the predetermined temperature, When the temperature is lower than a predetermined temperature, the heating medium circulating amount for heating in the circulation path per unit time is decreased as compared with the case where the temperature of the heating medium is a predetermined temperature, and the heating heat to the heating terminal is reduced. The hot water supply and heating device according to claim 1, wherein the hot water supply and heating device is configured to adjust a supply state of the medium. The adjusting means comprises:
A reflux path for branching the circulation path from the heating heat exchanger to the heating terminal and for refluxing a part of the heating medium to the heating heat exchanger without passing through the heating terminal; Provided,
When the temperature of the heating medium is higher than a predetermined temperature, the flow rate of the heating medium flowing into the reflux path is decreased as compared with the case where the temperature of the heating medium is a predetermined temperature, and the temperature of the heating medium is Is lower than a predetermined temperature, the flow rate of the heating medium flowing into the reflux path is increased more than when the temperature of the heating medium is a predetermined temperature, and the heating medium to the heating terminal is The hot water supply and heating device according to claim 1, which is configured to adjust a supply state. The adjusting means comprises:
If the flow rate of the heating medium flowing into the reflux path is decreased as compared with the case where the temperature of the heating medium is a predetermined temperature, the flow rate of the heating medium passing through the heating heat exchanger is reduced to a predetermined temperature. More than when the heating medium is supplied,
When the flow rate of the heating medium flowing into the reflux path is increased more than when the temperature of the heating medium is a predetermined temperature, the flow rate of the heating medium passing through the heating heat exchanger is increased to a predetermined temperature. The heating medium temperature control device for a heating device according to claim 3, wherein the heating medium temperature control device is configured to be smaller than when the heating medium is supplied.

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