JP2015102312A - Heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source machine capable of improving heat efficiency by suppressing heat radiation of a heat medium.SOLUTION: A heat source machine includes a heat medium circulation circuit 1, primary and secondary heat exchangers 2, 3, a circulation pump 4, and a heat medium tank 5. The heat source machine has at least any of the following structures: a structure where a bypass circuit 1c is connected to the heat medium circulation circuit 1 provided on the upstream side with respect to the circulation pump 4 and on the downstream side with respect to the heat medium tank 5; and a structure where a heat medium inflow control device 30 capable of controlling heat medium inflow to the secondary heat exchanger 3 is included, and is connected to the secondary heat exchanger 3.

Description

  The present invention relates to a heat source device, and more particularly to a heat source device capable of exchanging heat between a heat medium circulating in a low temperature and high temperature terminal and a combustion gas.

  In recent years, since energy conservation is becoming more important, heating heat source machines are required to have further improved thermal efficiency. For example, Japanese Patent Laying-Open No. 2001-65981 (Patent Document 1) discloses a water heater with improved heat exchange efficiency in a heat exchanger. In this water heater, during normal operation, the temperature of water can be raised through the entire water conduit of the heat exchanger by setting the water supply state from the main water supply line to the heat exchanger by the water supply control means. That is, the heat exchanger can be used with high efficiency. On the other hand, when there is a possibility that the white smoke phenomenon may occur due to a low outside air temperature, heat exchange is suppressed by setting the water supply state from the bypass water supply pipe by the water supply control means. Thereby, the white smoke phenomenon is prevented.

JP 2001-65981 A

  However, in the water heater as disclosed in the above publication, there is a problem that heat dissipation of the heat medium circulating in the water heater hinders improvement in thermal efficiency.

  This invention is made | formed in view of the said subject, The objective is to provide the heat source machine which can improve thermal efficiency by suppressing the thermal radiation of a heat medium.

  The heat source machine of the present invention can exchange heat between the heat medium circulating in the low and high temperature terminals and the combustion gas. The heat source device includes a heat medium circulation circuit, primary and secondary heat exchangers, a circulation pump, and a heat medium tank. The heat medium circulation circuit is for circulating the heat medium. The primary and secondary heat exchangers are connected to the heat medium circulation circuit and are for exchanging heat between the heat medium and the combustion gas. The circulation pump is arranged upstream of the heat medium circulation circuit with respect to the primary heat exchanger. The heat medium tank is arranged on the upstream side of the heat medium circuit than the circulation pump. The heat medium circulation circuit includes a low-temperature forward circuit, a high-temperature forward circuit, and a bypass circuit. The low temperature going circuit heats the heat medium returned from the low temperature and high temperature terminals by the secondary heat exchanger and supplies the heat medium to the low temperature terminals. In the high-temperature forward circuit, the heat medium returned from the low-temperature and high-temperature terminals is heated by the secondary heat exchanger and then heated by the primary heat exchanger and supplied to the high-temperature terminals. The bypass circuit branches the high-temperature forward circuit and joins a part of the heat medium supplied to the high-temperature terminal to the heat medium circulation circuit upstream of the circulation pump. The heat source device has a configuration in which the bypass circuit is connected to the heat medium circulation circuit upstream of the circulation pump and downstream of the heat medium tank, and heat that can control the amount of heat medium flowing into the secondary heat exchanger. It has at least one of the configurations of including a medium inflow control device and connecting the heat medium inflow control device to the secondary heat exchanger.

  According to the heat source apparatus of the present invention, the heat source apparatus is configured to connect the bypass circuit to the heat medium circulation circuit upstream of the circulation pump and downstream of the heat medium tank, and to the secondary heat exchanger. It has at least one of the structures which connect the heat-medium inflow amount control apparatus which can control a heat-medium inflow amount to a secondary heat exchanger. By connecting the bypass circuit to the heat medium circuit upstream of the circulation pump and downstream of the heat medium tank, the heat medium does not flow into the heat medium tank from the bypass circuit. The temperature can be lowered. For this reason, heat dissipation of the heat medium in the heat medium tank can be suppressed. Thereby, the thermal efficiency of a heat source machine can be improved. Further, the flow rate of the heat medium flowing through the secondary heat exchanger can be controlled by connecting the heat medium inflow amount control device to the secondary heat exchanger. Therefore, the temperature of the heat medium in the secondary heat exchanger can be lowered by suppressing the flow rate of the heat medium. For this reason, heat dissipation of the heat medium in the secondary heat exchanger can be suppressed. Thereby, the thermal efficiency of a heat source machine can be improved.

  In the above heat source machine, the heat medium tank includes an outlet communicating with the heat medium circulation circuit. The bypass circuit is connected to a heat medium circulation circuit downstream of the outlet. For this reason, a bypass circuit can be connected to the heat medium circulation circuit on the downstream side of the outlet of the heat medium tank.

  In the above heat source machine, the heat medium inflow control device includes a valve. For this reason, the inflow amount of the heat medium to the secondary heat exchanger can be easily controlled.

  As described above, according to the present invention, the thermal efficiency of the heat source machine can be improved.

It is the schematic which shows the structure of the heat source machine in Embodiment 1 of this invention, and the operation | movement at the time of high temperature heating. It is a functional block diagram for demonstrating the structure of the control apparatus shown in FIG. It is the schematic for demonstrating the connection of the heat-medium tank of the heat-source apparatus shown in FIG. 1, and a bypass circuit. It is the schematic which shows the operation | movement at the time of the low temperature heating of the heat-source equipment in Embodiment 1 of this invention. It is the schematic which shows the operation | movement at the time of the high temperature heating of the heat source machine of a comparative example. It is the schematic which shows the operation | movement at the time of the low temperature heating of the heat source machine of a comparative example. It is the schematic which shows the structure of the heat source machine in Embodiment 2 of this invention. It is a functional block diagram for demonstrating the structure of the control apparatus shown in FIG. It is the schematic which shows the operation | movement of the secondary heat exchanger shown in FIG. It is the schematic which shows operation | movement of the heat-source equipment of the modification 1 in Embodiment 2 of this invention. It is the schematic which shows operation | movement of the heat-source equipment of the modification 2 in Embodiment 2 of this invention. It is the schematic which shows the structure of the heat source machine in Embodiment 3 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, the configuration of the heat source apparatus according to Embodiment 1 of the present invention will be described.

  With reference to FIG. 1, heat exchange is possible between the heat medium (water) circulating in the hot water terminal 20 and the combustion gas. The hot water terminal 20 includes a low temperature terminal 21 and a high temperature terminal 22. The low temperature terminal 21 is, for example, a floor heating device, and the high temperature terminal 22 is, for example, a bathroom heating device.

  The heat source device of the present embodiment includes a heat medium circulation circuit 1, a primary heat exchanger 2, a secondary heat exchanger 3, a circulation pump 4, a heat medium tank 5, a combustion device (burner) 6, A blower (fan) 7, valves 8 and 9, a control device 10, a low temperature thermistor 11, and a high temperature thermistor 12 are mainly provided.

  The heat medium circulation circuit 1 is for circulating the heat medium. The primary heat exchanger 2 and the secondary heat exchanger 3 are connected to the heat medium circulation circuit 1. The primary heat exchanger 2 and the secondary heat exchanger 3 are for exchanging heat between the heat medium and the combustion gas. The primary heat exchanger 2 is configured to recover sensible heat of the combustion gas, and the secondary heat exchanger 3 is configured to recover latent heat of the combustion gas. The primary heat exchanger 2 and the secondary heat exchanger 3 are connected to each other. The primary heat exchanger 2 is located above the combustion device 6, and the secondary heat exchanger 3 is located above the primary heat exchanger 2.

  The circulation pump 4 is for circulating the heat medium in the heat medium circuit 1. The circulation pump 4 is disposed upstream of the heat medium circulation circuit 1 with respect to the primary heat exchanger 2. The heat medium tank 5 is for suppressing the pressure increase accompanying the expansion or contraction of the volume due to the temperature change of the heat medium. Further, the heat medium tank is configured to be able to replenish the heat medium. The heat medium tank 5 is disposed upstream of the circulation pump 4 in the heat medium circuit 1.

  The combustion device (burner) 6 is for supplying combustion gas. The blower (fan) 7 is for supplying combustion air to the combustion device 6. The blower device 7 is disposed below the combustion device 6. The valve 8 is configured to allow the flow of the heat medium from the low temperature forward circuit 1a to the low temperature terminal 21, and the valve 9 is configured to allow the flow of the heat medium from the high temperature forward circuit 1b to the high temperature terminal 22. Has been. The valve 8 is configured to be closed when a heat medium is flowing from the high-temperature forward circuit 1b to the high-temperature terminal 22, and the valve 9 is capable of being closed when a heat medium is flowing from the low-temperature forward circuit 1a to the low-temperature terminal 21. It is configured.

  Referring to FIGS. 1 and 2, control device 10 is electrically connected to circulation pump 4, blower device 7, valves 8 and 9, and low temperature and high temperature thermistors 11 and 12. The control device 10 mainly includes a control unit 10a and a temperature determination unit 10b. The control means 10a is for controlling each of the circulation pump 4, the blower 7, and the valves 8 and 9. The temperature determination means 10b is for receiving the temperature of the low temperature and high temperature thermistors 11 and 12 and determining the temperature of the low temperature forward circuit 1a and the high temperature forward circuit 1b.

  The low temperature thermistor 11 is for measuring the temperature of the low temperature going circuit 1a. The low temperature thermistor 11 is connected to the circulation pump 4. The high temperature thermistor 12 is for measuring the temperature of the high temperature going circuit 1b. The high temperature thermistor 12 is connected to the heat medium circulation circuit 1 on the downstream side of the secondary heat exchanger 2.

  The heat medium circulation circuit 1 includes a low-temperature forward circuit 1a, a high-temperature forward circuit 1b, and a bypass circuit 1c. The low-temperature going-out circuit 1 a is configured to heat the heat medium returned from the hot water terminal 20 (the low temperature terminal 21 and the high temperature terminal 22) with the secondary heat exchanger 3 and supply the heat medium to the low temperature terminal 21. The high-temperature forward circuit 1b heats the heat medium returned from the hot water terminal 20 (the low temperature terminal 21 and the high temperature terminal 22) with the secondary heat exchanger 3 and then heats it with the primary heat exchanger 2 so as to supply it to the high temperature terminal 21. It is configured. The bypass circuit 1 c is configured to branch the high-temperature forward circuit 1 b and join a part of the heat medium supplied to the high-temperature terminal 21 to the heat medium circulation circuit 1 on the upstream side of the circulation pump 4.

  The heat source apparatus of the present embodiment has a configuration in which the bypass circuit 1 c is connected to the heat medium circulation circuit 1 on the upstream side of the circulation pump 4 and on the downstream side of the heat medium tank 5.

  Referring to FIG. 3, the heat medium tank 5 includes an outlet 5a communicating with the heat medium circulation circuit. The bypass circuit 1c is connected to the heat medium circulation circuit 1 on the downstream side of the outlet 5a. Specifically, the bypass circuit 1 c is connected to a connection member CP for connecting to the bypass circuit 1 c on the downstream side of the outlet 5 a of the heat medium tank 5. When this connection member CP is integrated with the circulation pump 4 that is a vibration source, vibration propagates. Therefore, the circulation pump 4 and the connection member CP are separately connected by a cushioning material such as a rubber hose. Is preferred. Moreover, although the heat medium tank 5 and the connection member CP may be integrated or separated, the integrated one can reduce the cost. Further, it is more preferable that the connection member CP and the bypass circuit 1c are also connected by a buffer material such as a rubber hose. Moreover, it is good also considering the connection member CP as rubber-made cheese (T-shaped connection tool). In this case, since the propagation of vibration is blocked by the connecting member CP, the propagation of vibration can be prevented even if a copper pipe (rigid body) is connected to the connecting member CP instead of a buffer material such as a rubber hose.

Next, the operation at the time of high-temperature heating of the heat source machine according to the present embodiment will be described.
With reference to FIG. 1, the heat medium returned from the hot water terminal 20 (low temperature terminal 21 and high temperature terminal 22) flows into the secondary heat exchanger 3 through the heat medium circulation circuit 1, and the secondary heat exchanger 3. Is heated. The temperature of the heat medium returned from the hot water terminal 20 is, for example, 60 ° C., and the temperature of the heat medium after being heated by the secondary heat exchanger 3 is, for example, about 62 ° C. The heat medium heated in the secondary heat exchanger 3 flows into the heat medium tank 5 and then flows into the circulation pump 4 from the heat medium tank 5. Then, the circulation medium 4 flows out the heat medium, so that the heat medium flows into the primary heat exchanger 2. The heat medium heated by the primary heat exchanger 2 is supplied to the high temperature terminal 22 through the high temperature forward circuit 1b. The temperature of the heat medium supplied to the high temperature terminal 22 is 80 ° C., for example. In this case, the temperature of the heat medium flowing into the bypass circuit 1c connected to the high-temperature going circuit 1b is also 80 ° C.

Then, the operation | movement at the time of the low temperature heating of the heat-source equipment of this Embodiment is demonstrated.
Referring to FIG. 4, the heat medium returned from hot water terminal 20 (low temperature terminal 21 and high temperature terminal 22) passes through heat medium circulation circuit 1 to secondary heat exchanger 3 as in the case of the high temperature heating described above. It flows in and is heated by the secondary heat exchanger 3. At the time of low temperature heating, the temperature of the heat medium returned from the hot water terminal 20 is, for example, 40 ° C., and the temperature of the heat medium after being heated by the secondary heat exchanger 3 is, for example, about 42 ° C. The heat medium heated in the secondary heat exchanger 3 flows into the heat medium tank 5 and then flows into the circulation pump 4 from the heat medium tank 5. The heat medium that has flowed from the bypass circuit 1 c into the heat medium circuit 1 that is upstream from the circulation pump 4 and downstream from the heat medium tank 5 also flows into the circulation pump 4. The temperature of the heat medium flowing through the bypass circuit 1c is about 75 ° C., for example. Then, the circulating pump 4 sends out the heat medium, so that the heat medium is supplied to the low temperature terminal 21 through the low temperature going circuit 1a. The temperature of the heat medium supplied to the low temperature terminal 21 is 60 ° C., for example.

  Next, the effect of the heat source machine of this embodiment will be described in comparison with Comparative Examples 1 and 2. First, with reference to FIG. 5, the operation at the time of high-temperature heating of the heat source machine of the comparative example will be described. Unless otherwise specified, the same components as those in the present embodiment are denoted by the same reference numerals and description thereof will not be repeated. In the heat source machine of the comparative example, since the bypass circuit 1 c is connected to the heat medium tank 5, the high-temperature heat medium heated by the primary heat exchanger 2 flows into the heat medium tank 5. As a result, the temperature of the heat medium in the heat medium tank 5 is about 70 ° C.

  Then, with reference to FIG. 6, the operation | movement at the time of the low temperature heating of the heat source machine of a comparative example is demonstrated. Similarly to the high temperature heating described above, since the bypass circuit 1c is connected to the heat medium tank 5 also during the low temperature heating, the high temperature heat medium heated by the primary heat exchanger 2 flows into the heat medium tank 5. . As a result, the temperature of the heat medium in the heat medium tank 5 is 60 ° C., for example.

  That is, in the heat source machine of the comparative example, the temperature of the heat medium in the heat medium tank 5 is higher than that of the heat source machine of the present embodiment both during high temperature heating and during low temperature heating. As a result, in the heat source device of the comparative example, the heat dissipation amount of the heat medium in the heat medium tank 5 is larger than that of the heat source device of the present embodiment.

  On the other hand, according to the heat source device of the present embodiment, the heat source device connects the bypass circuit 1c to the heat medium circulation circuit 1 on the upstream side of the circulation pump 4 and on the downstream side of the heat medium tank 5. It has the composition to do. For this reason, since the heat medium does not flow into the heat medium tank 5 from the bypass circuit 1c, the temperature of the heat medium in the heat medium tank 5 can be lowered. For this reason, heat dissipation of the heat medium in the heat medium tank 5 can be suppressed. Thereby, the thermal efficiency of a heat source machine can be improved.

  Further, in the heat source apparatus of the present embodiment, the bypass circuit 1 c is connected to the heat medium circulation circuit 1 on the downstream side of the outlet 5 a of the heat medium tank 5. For this reason, the bypass circuit 1 c can be connected to the heat medium circulation circuit 1 on the downstream side of the outlet 5 a of the heat medium tank 5.

(Embodiment 2)
With reference to FIG. 7, the structure of the heat-source equipment in Embodiment 2 of this invention is demonstrated. Unless otherwise specified, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof will not be repeated. In the present embodiment, the bypass circuit 1 c is connected to the heat medium tank 5. A low temperature thermistor 11 is connected to the heat medium tank 5.

  As in the first embodiment, the heat source device of the present embodiment includes a heat medium circulation circuit 1, a primary heat exchanger 2, a secondary heat exchanger 3, a circulation pump 4, and a heat medium tank 5. And a combustion device (burner) 6, a blower device (fan) 7, valves 8 and 9, a control device 10, a low temperature thermistor 11, and a high temperature thermistor 12. Furthermore, an atmosphere thermistor 13 is provided. Moreover, although not shown in figure, the system number sensor which can detect the number of systems which the circuit of the low temperature and high temperature terminals 21 and 22 is open is provided.

  The heat source machine according to the present embodiment further includes a heat medium inflow amount control device 30. The heat medium inflow amount control device 30 is connected to the secondary heat exchanger 3 and is configured to be able to control the heat medium inflow amount to the secondary heat exchanger 3. Referring to FIGS. 7 and 8, the control means 10 a is configured to be able to control the heat medium inflow amount control device 30. Further, the control device 10 stores a system number determination means 10c for determining the number of systems in which the circuits of the low temperature and high temperature terminals 21 and 22 connected to the system number sensor are open, and the following correction value. Storage means 10d.

  7 and 9, the heat medium inflow control device 30 includes a valve (open / close valve) 30a. Further, a bypass 31 that connects the upstream side and the downstream side of the secondary heat exchanger 3 is provided. A valve 30 a is disposed between the branch of the bypass 31 and the secondary heat exchanger 3. The valve 30a is normally open. On the other hand, when the controller 10 determines that the secondary heat exchanger 3 can generate heat, the valve 30a is completely closed or partially closed. Thereby, the flow volume of the heat medium which flows into the secondary heat exchanger 3 is suppressed. Therefore, heat dissipation of the heat medium in the secondary heat exchanger 3 can be suppressed.

  When the calculated value of the heat medium temperature of the secondary heat exchanger 3 is higher than the calculated value of the exhaust temperature of the primary heat exchanger 2, the control device 10 can generate heat radiation in the secondary heat exchanger 3. to decide. Specifically, the calculated value of the heat medium temperature of the secondary heat exchanger 3 includes the measured temperature of the low temperature and high temperature thermistors 11 and 12, the number of systems in which the circuits of the low temperature and high temperature terminals 21 and 22 are open, and experiments in advance. It is calculated from the correction value obtained in (1). That is, secondary heat is generated by the control means 10a from the signal from the temperature determination means 10b that has received the temperature from the low temperature and high temperature thermistors 11 and 12, the signal from the system number determination means 10c, and the correction value from the storage means 10d. A calculated value of the heat medium temperature of the exchanger 3 is calculated. The calculated value of the exhaust temperature of the primary heat exchanger 2 is calculated from the sum of the measured temperature of the atmospheric thermistor 13, the gas proportional valve opening of the combustion device 6, and the amount of combustion heat of the combustion device 6. That is, the calculated value of the exhaust temperature of the primary heat exchanger 2 is calculated by the control means 10a from the signal from the temperature determination means 10b that has received the temperature from the atmosphere thermistor 13 and the signal from the combustion device 6.

  Referring to FIG. 10, a valve (open valve) 30 a is arranged in bypass 31 in the heat source device of Modification 1 in the present embodiment. The valve 30a is normally closed. On the other hand, when the controller 10 determines that the secondary heat exchanger 3 can generate heat, the valve 30a is opened. Thereby, the flow volume of the heat medium which flows into the secondary heat exchanger 3 is suppressed.

  Referring to FIG. 11, in the heat source device of Modification 2 in the present embodiment, a valve (three-way valve) 30 a is arranged at the branch of bypass 31. Normally, only the flow path to the secondary heat exchanger 3 is opened in the valve 30a. On the other hand, when it is determined by the control device 10 that the secondary heat exchanger 3 can generate heat, the flow path to the secondary heat exchanger 3 is completely closed or partially closed, and the bypass is bypassed. The flow path to the 31 side is opened. Thereby, the flow volume of the heat medium which flows into the secondary heat exchanger 3 is suppressed.

  Moreover, in this Embodiment, when the valve 30a is closed, since the flow path of the secondary heat exchanger 3 becomes narrow, it is preferable to control the rotation speed of the circulation pump 4 according to pressure loss. .

Next, the effect of the heat source machine of this Embodiment is demonstrated.
In the heat source machine of the present embodiment, the flow rate of the heat medium flowing through the secondary heat exchanger 3 can be controlled by connecting the heat medium inflow control device 30 to the secondary heat exchanger 3. Therefore, the temperature of the heat medium in the secondary heat exchanger 3 can be lowered by suppressing the flow rate of the heat medium. For this reason, heat dissipation of the heat medium in the secondary heat exchanger 3 can be suppressed. Thereby, the thermal efficiency of a heat source machine can be improved.

  Further, in the heat source device of the present embodiment, the heat medium inflow control device 30 includes a valve 30a. For this reason, the inflow amount of the heat medium to the secondary heat exchanger 3 can be easily controlled.

(Embodiment 3)
With reference to FIG. 12, the structure of the heat-source equipment in Embodiment 3 of this invention is demonstrated. Unless otherwise described, the same reference numerals are given to the same configurations as in the first and second embodiments, and description thereof will not be repeated. The present embodiment has a configuration in which the heating medium inflow control device 30 of the second embodiment is added to the first embodiment.

  In the present embodiment, the bypass circuit 1 c is upstream of the circulation pump 4 and connected to the heat medium circulation circuit 1 downstream of the heat medium tank 5, thereby radiating heat from the heat medium in the heat medium tank 5. Can be suppressed. In addition, by connecting the heat medium inflow control device 30 to the secondary heat exchanger 3, it is possible to suppress heat dissipation of the heat medium in the secondary heat exchanger 3. Therefore, the thermal efficiency of the heat source device can be further improved.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 Heat medium circulation circuit, 1a Low temperature forward circuit, 1b High temperature forward circuit, 1c Bypass circuit, 2 Secondary heat exchanger, 3 Primary heat exchanger, 4 Circulation pump, 5 Heat medium tank, 5a Outlet, 6 Combustion device, 7 Air blower, 8, 9, 30a valve, 10 control device, 10a control means, 10b temperature determination means, 10c system number determination means, 10d storage means, 11 low temperature thermistor, 12 high temperature thermistor, 13 atmosphere thermistor, 20 hot water terminal, 21 Low temperature terminal, 22 High temperature terminal, 30 Heat medium inflow control device, 31 Bypass.

Claims (3)

A heat source machine capable of exchanging heat between the heat medium circulating in the low temperature and high temperature terminals and the combustion gas,
A heating medium circulation circuit for circulating the heating medium;
A primary and secondary heat exchanger connected to the heat medium circuit and for exchanging heat between the heat medium and the combustion gas;
A circulation pump arranged on the upstream side of the heat medium circulation circuit from the primary heat exchanger;
A heating medium tank disposed on the upstream side of the heating medium circulation circuit from the circulation pump;
The heating medium circulation circuit is
A low-temperature circuit that heats the heating medium returned from the low-temperature and high-temperature terminals and supplies the heat medium to the low-temperature terminals by the secondary heat exchanger;
A high-temperature forward circuit that heats the heat medium returned from the low-temperature and high-temperature terminals by the secondary heat exchanger and then heats the heat medium by the primary heat exchanger and supplies the heated medium to the high-temperature terminals;
A bypass circuit that branches the high-temperature forward circuit and joins a part of the heating medium supplied to the high-temperature terminal to the heating medium circulation circuit upstream of the circulation pump;
The heat source machine is
The bypass circuit is upstream of the circulation pump and connected to the heat medium circulation circuit downstream of the heat medium tank, and the amount of heat medium flowing into the secondary heat exchanger can be controlled. A heat source machine comprising at least one of a configuration including a heat medium inflow amount control device and connecting the heat medium inflow amount control device to the secondary heat exchanger. The heating medium tank includes an outlet communicating with the heating medium circulation circuit;
The heat source device according to claim 1, wherein the bypass circuit is connected to the heat medium circulation circuit downstream of the outlet.   The heat source apparatus according to claim 1, wherein the heat medium inflow control device includes a valve.

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