JP5893993B2 - Heat supply system - Google Patents

Description

  The present invention relates to a heat supply system.

  2. Description of the Related Art Conventionally, a heat supply system including a heat source device and a heating terminal that operates by obtaining heat from the heat source device is known (see, for example, Patent Document 1).

  The heat supply system described in Patent Document 1 includes a heating burner, a heating terminal, a heat medium circulation path, and an expansion tank. The heating medium circulation path connects the heating burner and the heating terminal. As a result, the heating terminal operates by obtaining heat from the heating burner. The expansion tank is connected in the middle of the heat medium circulation path.

  The heat supply system includes a bath heat exchanger. The bath heat exchanger is connected to the heat medium circulation path so as to be in parallel with the heating terminal. Moreover, the bath heat exchanger is connected to the bath circuit. The bath circuit is connected to the bathtub. Bath water stored in the bathtub circulates in the bath circulation path. The bath water is reheated by exchanging heat with the heat medium in the bath heat exchanger.

JP 2010-223490 A

  Incidentally, in the heat supply system as described above, air may remain in the heating terminal or in the heat medium circulation path connected to the heating terminal. This residual air is deaerated when the heat medium flows into the expansion tank.

  On the other hand, when the reheating operation is performed, since the heat medium only flows through the heat medium circulation path and the bath heat exchanger, there is often little residual air. For this reason, it is considered that it is not necessary to circulate the heat medium through the expansion tank when performing the reheating operation.

  However, in the heat supply system of Patent Document 1, when the bath water reheating operation is performed, the heat medium circulates through the heat medium circulation path and the expansion tank, similarly to the operation of the heating terminal. That is, in this heat supply system, the heating burner has to heat both the heat medium in the heat medium circulation path and the heat medium stored in the expansion tank even during the reheating operation.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the amount of the heat medium that circulates in the heat source device and improve the heat efficiency when performing the reheating operation of the bath water. To provide a supply system.

The heat supply system of the present invention includes a heat source device, a heating terminal that operates by obtaining heat from the heat source device, a heat medium circulation path that connects the heat source device and the heating terminal, and the heat medium circulation path. A heating tank that is connected in the middle and stores the heat medium, and a reheating circuit that is provided in the heat medium circulation path so as to be in parallel with the heating terminal and retreats the hot water. A heat supply system, wherein a bypass path connecting the front and rear of the heating tank and a first flow path through which the heat medium flows through the bypass path, or the heat medium flows toward the heating tank. A switching means for switching to the second flow path; and a control section for controlling the operation of the switching means , wherein the control section is in a state where the heating terminal is in an operating state and a bath water reheating operation is in a stopped state. And the heating terminal is in an operating state. When the bath water reheating operation is in an operating state, the switching means is set to the second flow path. When the heating terminal is in a stopped state and the bath water reheating operation is in an operating state, the switching means is The first flow path is used.

  According to the heat supply system of the present invention, the amount of the heat medium flowing through the heat source device can be suppressed when performing the reheating operation of the bath water, thereby improving the heat efficiency.

It is a whole lineblock diagram of the heat supply system of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the heat supply system of the present embodiment includes a heat source device 1, a heating terminal 2, a heat medium circulation path 3, a heating tank 4, a reheating heat exchanger 51, and a renewal heat exchanger 51. A fired circulation path 6 and a control unit are provided. The heat supply system also includes a hot water supply channel 8. The heat supply system includes a heat source unit 11 for a heating circuit and a heat source unit 15 of a hot water supply channel 8 as the heat source device 1. That is, the heat supply system of the present embodiment is a so-called two-can three-channel heat supply system.

  The heat source device 1 includes a first heat source unit 11 and a second heat source unit 15. The first heat source unit 11 heats the heat medium that circulates in the heating circuit. The second heat source unit 15 heats the water flowing through the hot water supply channel 8. The first heat source unit 11 and the second heat source unit 15 include gas burners 12 and 16, sensible heat exchangers 13 and 17, and latent heat exchangers 14 and 18, respectively.

  A gas supply path 121 is connected to the gas burners 12 and 16. The gas supply path 121 supplies fuel gas to the gas burners 12 and 16. Examples of the fuel gas include city gas and propane gas.

  The sensible heat exchangers 13 and 17 collect the sensible heat of the exhaust gas from the gas burners 12 and 16. The latent heat exchangers 14 and 18 collect the latent heat of the exhaust gas from the gas burner. The latent heat exchangers 14 and 18 are configured to exchange heat with the exhaust gas after heat exchange with the sensible heat exchangers 13 and 17. In addition, the exhaust gas which passed through the latent heat exchangers 14 and 18 is condensed and changed into a liquid, and is discharged through the drain.

  In the first heat source unit 11, the sensible heat exchanger 13 and the latent heat exchanger 14 are connected via a first heat exchange intermediate flow path 31. The first heat exchange intermediate flow path 31 is a part of the heat medium circulation path 3. The first heat exchange intermediate flow path 31 is connected between the heat medium outlet 142 of the latent heat exchanger 14 and the heat medium inlet 131 of the sensible heat exchanger 13. The first heat exchange intermediate flow path 31 includes a tank return path 32 and a tank forward path 33. The tank return path 32 connects the heat medium outlet 142 of the latent heat exchanger 14 and the inlet 41 of the heating tank 4. The tank outward path 33 connects the outlet 42 of the heating tank 4 and the heat medium inlet 131 of the sensible heat exchanger 13.

  In the second heat source unit 15, the sensible heat exchanger 17 and the latent heat exchanger 18 are connected via a second heat exchange intermediate flow path 81.

  The heat source device 1 is not limited to the gas burners 12 and 16 and may be one that heats a heat medium or hot water using exhaust heat. The heat source device 1 may be, for example, a prime mover-driven power generation device. A prime mover-driven power generator generates electricity and exhaust heat. By using a prime mover-driven power generation device as the heat source device 1, a so-called cogeneration system can be configured.

  The heating terminal 2 obtains heat from the heat source device 1 and operates. Specifically, the heating terminal 2 obtains heat from the heat source device 1 through a heat medium. One or more heating terminals 2 are provided. Note that a valve (for example, a thermal valve) is provided at the heat medium inlet 21 of the heating terminal 2.

  The heat medium circulation path 3 connects the heat source device 1 and the heating terminal 2. A heat medium circulates in the heat medium circulation path 3. The heat medium circulation path 3 includes a circulation outward path 34, a circulation return path 35, and the first heat exchange intermediate flow path 31 described above. The circulation path 34 connects the heat medium outlet 132 of the sensible heat exchanger 13 and the heat medium inlet 21 of the heating terminal 2. The circulation return path 35 connects the heat medium outlet 22 in the heating terminal 2 and the heat medium inlet 141 of the latent heat exchanger 14. A pump 36 is connected in the middle of the heat medium circulation path 3. Thus, the heat medium circulates in the heat medium circulation path 3 and circulates between the heat source device 1 and the heating terminal 2.

  The heating tank 4 is used to absorb a volume change caused by expansion / contraction of the heat medium accompanying heating. The heating tank 4 includes an inlet 41 and an outlet 42. A heating medium is stored inside the heating tank 4. The inlet 41 allows the heat medium to flow into the heating tank 4. The outlet 42 allows the heat medium to flow out of the heating tank 4. The inflow port 41 is connected to the heat medium outlet 142 of the latent heat exchanger 14 via the tank return path 32. The outlet 42 is connected to the heat medium inlet 131 of the sensible heat exchanger 13 via the tank forward path 33. In other words, the heating tank 4 is connected in the middle of the heat medium circulation path 3. The heating tank 4 may be a sealed heating tank or an open heating tank.

  A bypass path 70 is connected to the upstream side and the downstream side of the heating tank 4. The bypass path 70 connects the tank return path 32 and the tank outbound path 33. In other words, the bypass 70 connects the front and rear of the heating tank 4.

  The heat supply system of this embodiment includes a switching unit 71. The switching means 71 switches the heat medium flow path between the first flow path and the second flow path. The first flow path is a flow path through which the heat medium flows in the order of the tank return path 32, the bypass path 70, and the tank forward path 33. In other words, the first flow path causes the heat medium to flow through the bypass path 70. The second flow path is a flow path through which the heat medium flows in the order of the tank return path 32, the heating tank 4, and the tank forward path 33. In other words, the second flow path causes the heat medium to flow toward the heating tank 4.

  The switching means 71 is constituted by a three-way valve. The switching means 71 is not limited to a three-way valve, and for example, a first electromagnetic valve is attached to the inlet 41 of the heating tank 4 and a second electromagnetic valve is attached to the bypass passage 70, so that the first electromagnetic valve And the second electromagnetic valve may be respectively controlled.

  A reheating circuit 5 is connected to the heat medium circulation path 3. The chasing circuit 5 is provided for chasing bath water. The upstream end of the chase circuit 5 is connected in the middle of the circulation forward path 34. The downstream end of the chase circuit 5 is connected in the middle of the circulation return path 35. The tracking circuit 5 includes a tracking heat exchanger 51, a tracking heat medium path 52, and a tracking circuit 6.

  The reheating heat exchanger 51 is provided in the middle of the reheating heat medium path 52. The reheating heat exchanger 51 is connected to the heat medium circulation path 3 so as to be in parallel with the heating terminal 2. In other words, the chase circuit 5 is provided in the heat medium circulation path 3 so as to be in parallel with the heating terminal 2. The reheating heat exchanger 51 performs heat exchange between bath water and a heat medium. A valve 53 (for example, a thermal valve) is provided in the middle of the reheating heat medium path 52. When the valve 53 is opened, the heat medium flows through the reheating heat medium path 52. Further, when the valve 53 is closed, the heat medium does not flow through the reheating heat medium path 52.

  The chasing circulation path 6 connects the bathtub 9 and the chasing heat exchanger 51. The chasing circulation path 6 is provided for chasing bath water. The follow-up circulation path 6 includes a rough forward path 61 and a short return path 62. The bathtub 9 includes a suction port 91 and a discharge port 92. The bath way 61 connects the suction port 91 of the bathtub 9 and the heat exchanger 51 for chasing. The bath return path 62 connects the reheating heat exchanger 51 and the discharge port 92 of the bathtub 9. A pump 63 is connected to the tracking circuit 6. Thereby, the bath water circulates in the chasing circulation path 6.

  The hot water supply channel 8 includes a water supply channel 82, a hot water supply channel 83, and the second heat exchange intermediate channel 81 described above. The water supply path 82 is connected to the inlet 181 of the latent heat exchanger 14 in the second heat source unit 15. The hot water supply path 83 connects the outlet 172 of the sensible heat exchanger 13 in the second heat source unit 15 and a hot water tap (not shown).

  The hot water supply channel 8 is provided with a bypass channel 84 so as to bypass the heat source device 1. The bypass passage 84 connects the water supply passage 82 and the hot water supply passage 83 before and after the heat source device 1. Further, a valve 85 (for example, an electromagnetic valve) is connected to the bypass flow path 84.

  The control unit controls the operation of the switching unit 71. The control unit controls the switching unit 71 to switch to the first flow path when the bath water reheating operation is performed. The bath water reheating operation may be selected by a user operation, or may be automatically performed by detecting the temperature of the bath water with a sensor.

  The control unit controls the heat source device 1. The control unit performs operation / stop of the heat source device 1 and control of the heat generation amount. Further, the control unit controls driving of the pump 36 in the heat medium circulation path 3. Further, the control unit controls driving of the pump 63 of the tracking circuit 6. The control unit controls the rotation speed of the motors of the pumps 36 and 63. The rotation speed control of the motors of the pumps 36 and 63 is performed by inverter control, for example. Thereby, the circulation flow rate of the heat medium in the heat medium circulation path 3 and the circulation flow rate of the bath water in the additional circulation path 6 are controlled. The control unit also controls the opening and closing operations of various driving valves such as a valve provided at the inlet 21 of the heating terminal 2 and the valve 53 in the reheating circuit 5. The control unit is configured by a computer whose main component is a microprocessor.

  The heat supply system having such a configuration operates as follows.

  When the user selects the bath water reheating operation while the heating terminal 2 is stopped, the control unit controls the switching means 71 to switch to the first flow path. The control unit operates the first heat source unit 11 of the heat source device 1. Further, the control unit operates the pump 36 of the heat medium circulation path 3 and the pump 63 of the reheating circulation path 6. Further, the control unit opens the valve 53 of the chase circuit 5 and closes the valve of the inlet 21 of the heating terminal 2.

  Then, the heat medium heated by the heat source device 1 circulates in the heat medium circulation path 3. The heat medium that has passed through the latent heat exchanger 14 flows through the tank return path 32 and flows into the tank forward path 33 via the bypass path 70. The heat medium passes through the sensible heat exchanger 13 and flows into the tracking circuit 5 through the circulation outward path 34. The heat medium passes through the reheating heat exchanger 51 and flows into the circulation return path 35. Thereafter, the heat medium again flows into the latent heat exchanger 14.

  At this time, the hot water in the bathtub 9 is taken into the forward path 61 through the suction port 91. The bath water flows into the reheating heat exchanger 51 through the forward path 61. The bath water flowing into the reheating heat exchanger 51 receives heat from the heat medium by exchanging heat with the heat medium, thereby increasing the temperature. Thereafter, the bath water is returned to the bathtub 9 through the bath return path 62. As bath water is circulated in this manner, the temperature of bath water in bathtub 9 rises.

  When the user stops the bath water reheating operation and activates the heating terminal 2, the control unit controls the switching means 71 to switch to the second flow path. The control unit operates the first heat source unit 11 of the heat source device 1. Further, the control unit operates the pump 36 of the heat medium circulation path 3. Further, the control unit closes the valve 53 of the chase circuit 5 and opens the valve of the heating terminal 2.

  Then, the heat medium heated by the heat source device 1 circulates in the heat medium circulation path 3. The heat medium that has passed through the latent heat exchanger 14 flows through the tank return path 32 and flows into the heating tank 4. The heat medium in the heating tank 4 flows into the tank forward path 33. The heat medium flows into the circulation outward path 34 through the tank outward path 33 and the sensible heat exchanger 13. The heat medium in the circulation outward path 34 flows into the heating terminal 2. The heat medium flowing into the heating terminal 2 performs heat exchange at the heating terminal 2. Thereafter, the heat medium again flows into the latent heat exchanger 14 via the circulation return path 35.

  When the user selects the hot water reheating operation while the heating terminal 2 is operating, the control unit controls the switching unit 71 to switch to the second flow path.

  As described above, the heat supply system of the present embodiment includes the bypass 70 that connects the front and rear of the heating tank 4, the switching unit 71, and the control unit. The switching means 71 switches to either the first channel or the second channel. The controller switches the switching means 71 to the first flow path when the bath water reheating operation is performed.

  Thus, the heat medium of the heat supply system of the present embodiment circulates in the heat medium circulation path 3 without passing through the heating tank 4 during the bath water reheating operation. For this reason, the heat source device 1 does not heat the heat medium stored in the heating tank 4, but only heats the heat medium in the heat medium circulation path 3. That is, according to the heat supply system of the present embodiment, the amount of the circulating heat medium can be reduced and the amount of heating by the heat source device 1 can be reduced in the reheating operation of bath water.

  By the way, in the conventional heat supply system, the heat medium heated by the heat source device 1 was once stored in the heating tank 4 even during the reheating operation. In other words, in the conventional configuration, the heating medium stays in the heating tank 4 for at least a certain time, so that there is a problem that heat is radiated in the heating tank 4.

  However, according to the heat supply system of the present embodiment, since the heated heat medium does not stay in the heating tank 4, not only the amount of the circulating heat medium can be reduced, but also the amount of heat radiated can be reduced. You can also As a result, the thermal efficiency in the system can be greatly improved.

  The controller of the heat supply system of the present embodiment switches the switching means 71 to the first flow path when the operation of the heating terminal 2 is stopped and the bath water reheating operation is performed. It is. For this reason, when the operation of the heating terminal 2 with a large circulation amount of the heat medium is performed simultaneously with the reheating operation, the heat medium can be circulated through the heating tank 4.

  In addition, although the heat source device 1 of the heat supply system of the present embodiment has the latent heat exchanger 14, in the heat supply system of the present invention, the heat source device may not have the latent heat exchanger. Good. Further, the heat source device of the present invention is not limited to that of the present embodiment.

DESCRIPTION OF SYMBOLS 1 Heat source apparatus 11 1st heat source part 12 Gas burner 13 Sensible heat exchanger 14 Latent heat exchanger 15 2nd heat source part 16 Gas burner 17 Sensible heat exchanger 18 Latent heat exchanger 2 Heating terminal 3 Heat medium circulation path 32 Tank return path 33 Tank outbound path 34 Circulation outbound path 35 Circulation return path 4 Heating tank 5 Reheating circuit 51 Reheating heat exchanger 52 Reheating heat transfer path 6 Reheating recirculation path 61 Reflow path 62 Reflow path 70 Bypass path 71 Switching Means 8 Flow path for hot water supply 9 Bathtub

Claims (1)

A heat source device;
A heating terminal that operates by obtaining heat from the heat source device;
A heat medium circuit connecting the heat source device and the heating terminal;
A heating tank that is connected in the middle of the heat medium circulation path and stores the heat medium;
A heat supply system provided with a reheating circuit provided in the heating medium circulation path so as to be reheated in parallel with the heating terminal;
A bypass path connecting the front and rear of the heating tank;
Switching means for switching to a first flow path for circulating the heat medium through the bypass path or a second flow path for flowing the heat medium toward the heating tank;
A control unit for controlling the operation of the switching means ,
The controller is
When the heating terminal is in an operating state and the bath water reheating operation is in a stopped state, and when the heating terminal is in an operating state and the bath water reheating operation is in an operating state, the switching means is set to the second means. In the flow path,
The heat supply system , wherein the switching means is the first flow path when the heating terminal is stopped and the bath water reheating operation is activated .

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