JP2012013245A - Heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of keeping heating of a heat medium for heating by a heat source machine to the minimum necessary in a heating system using a heat pump heating mechanism and the heat source machine together.SOLUTION: The heating system includes the heat pump heating mechanism heating the heat medium for heating by using heat absorbed from the air, the heat source machine heating the heat medium for heating by using heat generated by combustion of a fuel, and a heater heating by using heat radiation from the heat medium for heating. The heat pump heating mechanism heats the heat medium for heating so as to be a prescribed target heating temperature. The heat source machine starts heating of the heat medium for heating when a temperature of the heat medium for heating supplied to the heater drops to a prescribed ignition temperature, and stops the heating of the heat medium for heating when the temperature of the heat medium for heating supplied to the heater rises to a prescribed fire extinguishing temperature. The heating system raises the target heating temperature of the heat pump heating mechanism when the heat source machine starts the heating of the heat medium for heating.

Description

  The present invention relates to a heating system.

  A heating system that uses a heat pump heating mechanism that heats a heating medium by using heat absorbed from the atmosphere and a heat source that heats the heating medium by using heat generated by fuel combustion is known. Yes. In general, a heat pump that uses heat absorption from the atmosphere is high in energy efficiency, but its heating capacity is not so high. That is, a large amount of heat cannot be supplied in a short time. Therefore, there is a heat pump heating mechanism of the type that heats water by heating with a heat pump and stores it as hot water in a hot water storage tank, and uses the hot water in the hot water storage tank to heat the heating medium when necessary. Conventionally used. However, the size of the hot water storage tank is limited, and there is a limit to the amount of heat that can be supplied from the hot water storage tank at a time. In view of this, a heating system capable of responding to various heat demands has been developed by using a heat source device capable of supplying a large amount of heat instantaneously in combination with a heat pump heating mechanism so as to have high overall energy efficiency. Patent Document 1 discloses a heating system that uses both such a heat pump heating mechanism and a heat source device.

JP 2010-101521 A

  Generally, in a heating system that uses both a heat pump heating mechanism and a heat source device, ignition and extinguishing control of the heat source device is performed according to the temperature of the heating heat medium supplied to the heater. In the situation where heating by the heat source machine is not performed, when the heating amount by the heat pump heating mechanism and the heat radiation amount by the heating machine are balanced, the temperature of the heating medium supplied to the heating machine is almost temporally Stabilize. When the amount of heat dissipated in the heater exceeds the amount of heating by the heat pump heating mechanism, the temperature of the heating medium supplied to the heater gradually decreases. Also, in the situation where the heating by the heat pump heating mechanism and the heating by the heat source machine are performed simultaneously, if the total heating amount by the heat pump heating mechanism and the heating amount by the heat source machine exceeds the heat radiation amount by the heating machine, it is supplied to the heating machine. The temperature of the heating medium to be heated gradually increases. Therefore, the temperature of the heating medium supplied to the heater is observed, and when the temperature of the heating medium decreases to a predetermined ignition temperature, heating of the heating medium by the heat source unit is started. Moreover, when the temperature of the heating medium supplied to the heater rises to a predetermined fire extinguishing temperature, heating of the heating medium by the heat source unit is stopped. Thus, by controlling the ignition and extinguishing of the heat source machine according to the temperature of the heating medium supplied to the heater, it is possible to appropriately cope with the heat demand in the heater. Usually, the ignition temperature of the heat source device is a temperature obtained by subtracting a predetermined temperature range from a set temperature (for example, 50 ° C. when the heater is a floor heating device) when supplying the heating medium to the heater (for example, 45 ° C.). The fire extinguishing temperature of the heat source machine is set to a temperature (eg, 55 ° C.) obtained by adding a predetermined temperature range to a set temperature (eg, 50 ° C.) when supplying the heating medium to the heater.

  Even when heating by a heat pump heating mechanism and heating by a heat source device are used together, from the viewpoint of energy efficiency, the necessary amount of heating is covered by the heat pump heating mechanism as much as possible, and heating by the heat source device is kept to the minimum necessary level. It is preferable to keep it. Therefore, when the heat pump heating mechanism and the heat source device are heating the heating medium at the same time, if the amount of heat dissipated in the heating device decreases and the heat pump heating mechanism alone can cover the necessary heating amount, It is preferable to quickly stop heating by the machine.

  However, when controlling the ignition and extinguishing of the heat source device according to the temperature of the heating medium supplied to the heater, the heating by the heat source device may not stop easily even after the amount of heat released from the heater has decreased. This has been found by the inventors' research. When the amount of heat released by the heater decreases, the temperature of the heating medium after passing through the heater increases, and accordingly, the amount of heating to the heating medium in the heat pump heating mechanism decreases. That is, as the amount of heat dissipated in the heater is reduced, the amount of heat in the heat pump heating mechanism is also reduced, and the reduction is covered by the heat source unit. The temperature is kept constant. Therefore, even if the heat dissipation in the heater decreases, the temperature of the heating medium supplied to the heater does not reach the fire extinguishing temperature, and the heat source machine continues to heat the heating medium forever. End up. When the amount of heat radiation in the heater is reduced, it is preferable that the heating of the heating medium by the heat source machine can be quickly stopped and the heating medium can be heated only by the heat pump heating mechanism.

  The present invention solves the above problems. The present invention provides a technology capable of suppressing heating of a heating heat medium by a heat source device to a necessary minimum in a heating system using both a heat pump heating mechanism and a heat source device.

The present invention includes a heat pump heating mechanism that heats a heating medium using heat absorbed from the atmosphere, a heat source that heats the heating medium using heat generated by fuel combustion, and heating heat. The present invention is embodied as a heating system including a heater that heats using heat radiation from the medium. The heat pump heating mechanism is configured to heat the heating medium so as to reach a predetermined target heating temperature. The heat source unit starts heating the heating medium when the temperature of the heating medium supplied to the heater is lowered to a predetermined ignition temperature, and the temperature of the heating medium supplied to the heater is When the temperature rises, heating of the heating medium is stopped. The heating system is characterized by raising the target heating temperature of the heat pump heating mechanism when the heat source machine starts heating the heating medium.
The heat pump heating mechanism here may be one that heats the heat pump refrigerant that has absorbed heat from the atmosphere directly with the heating heat medium to heat the heating heat medium, or the heat pump refrigerant that has absorbed heat from the atmosphere. Water may be heated to store the hot water in a hot water storage tank, and the heating medium may be heated using the hot water in the hot water storage tank when necessary.

  In the above heating system, when the heat source machine is not heating the heating medium, the heating medium is heated only by the heat pump heating mechanism. While the amount of heat radiation in the heater is in equilibrium with the amount of heat generated by the heat pump heating mechanism, the temperature of the heating medium supplied to the heater is stable over time. When the heat dissipation amount in the heater exceeds the heating amount by the heat pump heating mechanism, the temperature of the heating heat medium supplied to the heater decreases with time. In the above heating system, the temperature of the heating medium supplied to the heater is monitored, and when the temperature of the heating medium supplied to the heater decreases to the ignition temperature, the heat source machine Start heating the medium. In the above heating system, when heating by the heat source machine is started, the target heating temperature in the heat pump heating mechanism is raised. By adopting such a configuration, even if the amount of heat released in the heater subsequently decreases and the temperature of the heating medium after radiating heat from the heater increases, the decrease in the amount of heat in the heat pump heating mechanism is suppressed. can do. When the amount of heat radiation in the heater is reduced, the temperature of the heating medium supplied to the heater can be quickly raised to the fire extinguishing temperature, and heating of the heating medium by the heat source machine can be stopped quickly. . Heating of the heating medium using the heat source machine can be suppressed to the minimum necessary level.

  The heating system preferably lowers the target heating temperature of the heat pump heating mechanism when the heat source machine stops heating the heating medium.

  In the above heating system, when the heat source machine stops heating the heating medium and heats the heating medium only by the heat pump heating mechanism, the target heating temperature of the heat pump heating mechanism is lowered. Thereby, when the amount of heat radiation in the heater increases again, the temperature of the heating heat medium supplied to the heater can be quickly lowered to the ignition temperature, and heating by the heat source device can be started quickly.

  In the above heating system, the difference between the ignition temperature and the extinguishing temperature of the heat source machine when the heat pump heating mechanism is heating the heating medium, the heat source machine when the heat pump heating mechanism is not heating the heating medium It is preferable that the temperature is set smaller than the difference between the ignition temperature and the extinguishing temperature.

  When the heat source device and the heat pump heating mechanism simultaneously heat the heating medium, it is preferable that the heat source device is extinguished and ignited quickly in order to increase energy efficiency. However, when the heat pump heating mechanism does not heat the heating medium and the heating medium is heated only by the heat source unit, it is not always necessary to quickly extinguish and ignite the heat source unit. On the other hand, if the heat source machine is frequently extinguished and ignited, the parts of the heat source machine will age and the product life will be shortened. Therefore, in the above heating system, the difference between the ignition temperature and the extinguishing temperature of the heat source unit is set small only when the heat source unit and the heat pump heating mechanism simultaneously heat the heating medium. Thereby, only when the heat source device and the heat pump heating mechanism simultaneously heat the heating medium, the heat source device can be quickly extinguished and ignited to increase energy efficiency.

  According to the present invention, in a heating system using both a heat pump and a heat source device, heating of the heating heat medium by the heat source device can be minimized.

The figure which shows typically the structure of the hot-water supply heating system 10 of Example 1. FIG. The flowchart explaining operation | movement of the hot water storage unit 200 in the low temperature heating driving | operation of the hot-water supply heating system 10 of Example 1. FIG. The flowchart explaining operation | movement of the hot-water supply heating unit 300 in the low temperature heating operation of the hot-water supply heating system 10 of Example 1. FIG. The flowchart explaining the operation | movement of the other aspect of the hot water supply and heating unit 300 in the low temperature heating operation of the hot water supply and heating system 10 of Example 1. FIG.

The main features of the embodiments described below are listed below.
(Feature 1) Heating medium for heating is water or antifreeze.
(Feature 2) The heat pump refrigerant is CO2 or HFC.

  Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 shows a hot water supply / heating system 10 according to the present embodiment. The hot water supply and heating system 10 includes an HP (heat pump) unit 100, a hot water storage unit 200, a hot water supply and heating unit 300, an expansion tank 410, a remote controller 500, and the like. The hot water supply and heating system 10 can perform hot water supply to hot water supply locations such as currants (not shown), heating by the heating system 400 using a heating medium, and hot water and reheating of the bathtub 600. As a heating medium used by the heating system 400, water or antifreeze can be used.

  The HP unit 100 is a refrigeration cycle apparatus in which refrigerant circulates in this order through a compressor 102, a radiator 104, an expansion mechanism 106, and an evaporator 108 connected by piping. The refrigerant that has been compressed by the compressor 102 and has reached a high temperature is cooled by heat exchange with water in the radiator 104 and sent to the expansion mechanism 106. The refrigerant having a lower temperature due to adiabatic expansion in the expansion mechanism 106 is heated by heat exchange in the evaporator 108. The evaporator 108 is a fin tube type heat exchanger, and rotates the fan 116 to exchange heat between the refrigerant and the outside air. The refrigerant heated by the heat exchange in the evaporator 108 is returned to the compressor 102. In addition, as a refrigerant of the HP unit 100, CO2 that is a natural refrigerant can be used in addition to HFC (hydrofluorocarbon) that is an alternative chlorofluorocarbon. Further, as the expansion mechanism 106, a cavity tube or the like can be used in addition to the expansion valve.

  When the pump 110 of the HP unit 100 is driven, water is sucked out from the lower part of the hot water storage tank 202 of the hot water storage unit 200 via the circulation piping 112. The water sent from the hot water storage tank 202 to the HP unit 100 is heated by heat exchange with the refrigerant in the radiator 104 and then returned to the upper part of the hot water storage tank 202 through the circulation return pipe 114. The thermistor 118 detects the temperature of water sent from the circulation piping 112 to the radiator 104. The thermistor 120 detects the temperature of the water sent from the radiator 104 to the circulation return pipe 114.

  The HP controller 122 controls operations of the compressor 102, the fan 116, and the pump 110 in accordance with the detected temperatures of the thermistors 118 and 120. The HP controller 122 can communicate with the hot water storage controller 286 of the hot water storage unit 200, and a cooperative operation between the HP unit 100 and the hot water storage unit 200 is realized.

  The hot water storage unit 200 includes a hot water storage tank 202, a heat exchanger 204, a pump 206, and the like. The hot water storage tank 202 stores hot water heated by the HP unit 100. The hot water storage tank 202 is a sealed type, and the outside is covered with a heat insulating material. In a state where hot water is stored, temperature stratification is formed inside the hot water storage tank 202, the water temperature in the lower part of the hot water storage tank 202 is low, and the water temperature in the upper part is high. Thermistors 218, 222, and 224 that detect the temperature of hot water in the hot water storage tank 202 are arranged at different heights from the upper part to the lower part of the hot water storage tank 202, respectively.

  When the HP unit 100 is in operation, the low temperature water in the lower part of the hot water storage tank 202 is sent to the HP unit 100 via the circulation lower pipe 208, the three-way valve 210, and the circulation forward pipe 112. The high-temperature water heated by the HP unit 100 is returned to the upper part of the hot water storage tank 202 via the circulation return pipe 114, the three-way valve 212, and the circulation upper pipe 214. The thermistor 226 detects the temperature of the water flowing through the circulation lower pipe 208. The thermistor 228 detects the temperature of the water flowing through the circulation upper pipe 214. In addition, by switching the communication state between the three-way valve 210 and the three-way valve 212, the water sent from the HP unit 100 to the hot water storage unit 200 is supplied to the circulation return pipe 114, the three-way valve 212, the circulation bypass pipe 216, and the three-way valve 210. Further, it can be circulated so as to return to the HP unit 100 again via the circulation forward piping 112. The circulation of water in such a manner is performed in an anti-freezing operation for preventing freezing of the circulation forward piping 112 and the circulation return piping 114 when the hot water supply / heating system 10 is used in a cold region.

  Water is supplied to the lower part of the hot water storage tank 202 via the first water supply pipe 246 and the tank water supply pipe 256. One end of the first water supply pipe 246 communicates with the water supply, and the other end branches into a tank water supply pipe 256 and a second water supply pipe 258. The first water supply pipe 246 is provided with a flow meter 248, a check valve 250, a governor 252, and a thermistor 254. The tank water supply pipe 256 communicates the first water supply pipe 246 and the lower part of the hot water storage tank 202. The tank water supply pipe 256 is provided with a flow meter 260 and a flow rate adjustment valve 262. The second water supply pipe 258 joins the tank hot water supply pipe 264 extending from the upper part of the hot water storage tank 202 and communicates with the first hot water supply pipe 270. A flow rate adjustment valve 266 is provided in the second water supply pipe 258. A thermistor 268 is provided in the tank outlet pipe 264. The first hot water supply pipe 270 is provided with a thermistor 271 that detects the temperature of the water after the low temperature water from the water supply and the high temperature water from the upper part of the hot water storage tank 202 are mixed. By adjusting the opening degree of the flow rate adjusting valve 266, the flow rate of water flowing from the first water supply pipe 246 into the second water supply pipe 258 is adjusted. By adjusting the opening degree of the flow rate adjustment valve 262, the flow rate of water flowing into the lower part of the hot water storage tank 202 via the first water supply pipe 246 and the tank water supply pipe 256 is adjusted. The flow rate of the hot water pushed out to the tank discharge pipe 264 is adjusted. Therefore, based on the temperature of the water from the water supply detected by the thermistor 254, the temperature of the water from the upper part of the hot water storage tank 202 detected by the thermistor 268, the temperature of the mixed water detected by the thermistor 271, etc. By adjusting the opening degree of the regulating valve 262 and the flow rate regulating valve 266, the water flowing through the first hot water supply pipe 270 can be adjusted to a desired temperature. Note that a bypass pipe 284 in which a normally-open electromagnetic valve 282 is interposed is separately provided between the second water supply pipe 258 and the first hot water supply pipe 270. When the opening degree of the flow rate adjusting valves 262 and 266 cannot be adjusted due to a power failure, the electromagnetic valve 282 is opened and water from the first water supply pipe 246 is directly sent out to the first hot water supply pipe 270. By adopting such a configuration, it is possible to prevent unintended high-temperature water from flowing through the first hot water supply pipe 270 during a power failure.

  The first hot water supply pipe 270 communicates with a hot water supply location such as a currant (not shown) via the second hot water supply pipe 272. From the middle of the first hot water supply pipe 270, the first hot water supply connection pipe 274 branches, and the second hot water supply connection pipe 276 joins further downstream of the first hot water supply pipe 270. The water sent from the hot water storage unit 200 to the hot water supply / heating unit 300 via the first hot water supply connection pipe 274 is heated by the combustion heat of the gas in the hot water supply / heating unit 300 and then stored via the second hot water supply connection pipe 276. It is returned to the unit 200 and supplied to a hot water supply location such as a curan through the second hot water supply pipe 272. A flow rate adjustment valve 278 is provided between the branching point of the first hot water supply connecting pipe 274 and the joining point of the second hot water supply connecting pipe 276 in the first hot water supply pipe 270. The second hot water supply pipe 272 is provided with a thermistor 280 that detects the temperature of water finally supplied to the hot water supply location.

  The heat exchanger 204 is a double wall type heat exchanger, and a heating heat medium sent from the heating system 400 to the hot water storage unit 200 via the first heating return pipe 402 and water from the upper part of the hot water storage tank 202. Heat exchange. When the pump 206 is driven, hot water is sucked out from the upper part of the hot water storage tank 202 and sent to the heat exchanger 204. The water cooled by heat exchange with the heating medium in the heat exchanger 204 is returned to the bottom of the hot water storage tank 202. The thermistor 230 detects the temperature of the water sent from the upper part of the hot water storage tank 202 to the heat exchanger 204. The thermistor 232 detects the temperature of water sent from the heat exchanger 204 to the lower part of the hot water storage tank 202.

  The heating heat medium sent from the first heating return pipe 402 to the hot water storage unit 200 is heated by heat exchange with high-temperature water in the heat exchanger 204 and heated via the second heating return pipe 404. Sent to the unit 300. A thermistor 234 and a flow meter 236 are provided on the inlet side of the heating medium flow path of the heat exchanger 204. A thermistor 238 is provided on the outlet side of the flow path of the heating heat medium of the heat exchanger 204. Further, a bypass pipe 240 having a flow rate adjusting valve 242 interposed is separately provided between the first heating return pipe 402 and the second heating return pipe 404.

  The hot water storage unit 200 includes a hot water storage controller 286. The hot water storage controller 286 controls the operations of the pump 206, the three-way valves 210 and 212, and the various flow rate adjustment valves in the hot water storage unit 200 based on the outputs of the various thermistors and various flow meters in the hot water storage unit 200. The hot water storage controller 286 can communicate with the HP controller 122 of the HP unit 100 and the hot water supply / heating controller 396 of the hot water supply / heating unit 300, respectively, and the cooperative operation between the hot water storage unit 200 and the HP unit 100, A cooperative operation between the hot water supply and heating units 300 is realized.

  The hot water supply and heating unit 300 includes a gas heat source unit 302, a heating circulation pump 304, a bath circulation pump 306, a heat exchanger 312 and the like. The gas heat source unit 302 includes a hot water supply heat source unit 308 for heating hot water supply water and a heating heat source unit 310 for heating a heating medium. The hot water supply heat source machine 308 and the heating heat source machine 310 are both latent heat recovery type gas heat source machines that use the combustion heat of fuel gas such as city gas or LP gas. The hot water supply heat source device 308 and the heating heat source device 310 are installed adjacent to each other, and can share a power source, a drain discharge mechanism, and the like. A gas flow path 314 that supplies gas to the gas heat source device 302 branches into a hot water supply gas flow path 318 and a heating gas flow path 320 downstream from the gas main valve 316.

  The hot water supply gas flow path 318 is provided with a gas proportional valve 322 for adjusting the gas flow rate. The hot water supply gas flow path 318 is further branched downstream from the gas proportional valve 322, and supplies gas to each of a plurality of burners 326, 328, and 330 provided in the hot water supply heat source unit 308. The supply and shutoff of gas to the plurality of burners 326, 328, 330 are switched by gas switching valves 326a, 328a, 330a provided correspondingly. Air is supplied into hot water supply heat source unit 308 by fan 332, gas is supplied to burners 326, 328, 330 via hot water supply gas flow path 318, and ignition is performed by igniter 334, whereby hot water supply heat source unit 308 is in a combustion operation. To start. The combustion state of the burners 326, 328 and 330 is detected by the frame rod 336.

  The heating gas flow path 320 is provided with a gas proportional valve 324 for adjusting the gas flow rate. The heating gas flow path 320 is further branched downstream from the gas proportional valve 324 and supplies gas to each of the plurality of burners 338 and 340 provided in the heating heat source unit 310. The supply and shutoff of gas to the plurality of burners 338 and 340 are switched by correspondingly provided gas switching valves 338a and 340a. Air is supplied into the heating heat source unit 310 by the fan 342, gas is supplied to the burners 338 and 340 via the heating gas flow path 320, and ignition is performed by the igniter 344, whereby the heating heat source unit 310 starts a combustion operation. To do. The combustion state of the burners 338 and 340 is detected by the frame rod 346.

  The water sent from the hot water storage unit 200 to the hot water supply / heating unit 300 via the first hot water supply connection pipe 274 is sent to the hot water supply heat source machine 308 via the first hot water supply heat source machine pipe 356. The water sent to the hot water supply heat source machine 308 is heated through the sub heat exchanger 348 and the main heat exchanger 350 in this order, and then passes through the second hot water supply heat source machine pipe 358 and the second hot water supply connection pipe 276. It is returned to the hot water storage unit 200 and supplied to a hot water supply location such as a curan through the second hot water supply pipe 272. In the main heat exchanger 350, water is heated by absorbing sensible heat from the combustion exhaust of the burners 326, 328, and 330. The auxiliary heat exchanger 348 absorbs the latent heat generated when the water vapor in the combustion exhaust gas that has passed through the main heat exchanger 350 condenses, and heats the water. A bypass pipe 352 including a bypass control valve 354 is provided between the first hot water supply heat source machine pipe 356 and the second hot water supply heat source machine pipe 358. When the bypass control valve 354 is opened, part of the water flowing from the first hot water supply connection pipe 274 into the first hot water supply heat source machine pipe 356 passes through the bypass pipe 352 without passing through the hot water supply heat source machine 308. It flows into the hot water supply heat source machine piping 358. The first hot water supply heat source machine pipe 356 is provided with a flow meter 360 and a flow rate adjustment valve 362. The second hot water supply heat source pipe 358 includes a thermistor 364 that detects the temperature of water heated by the main heat exchanger 350 of the hot water supply heat source 308 and a thermistor that detects the temperature of water downstream from the junction of the bypass pipe 352. 366 is provided.

  A hot water pipe 368 communicating with the bath circulation pump 306 is branched from the middle of the second hot water supply heat source machine pipe 358. The hot water pipe 368 includes a pouring electromagnetic valve 370 having a backflow prevention mechanism. When the hot water solenoid valve 370 is opened, the water heated by the hot water supply heat source 308 is supplied to the bathtub 600 via the hot water pipe 368 and the bath circulation pump 306.

  A recirculation circuit 372 that returns to the bathtub 600 is connected to the bathtub 600 via the bath circulation pump 306 and the heat exchanger 312. The heat exchanger 312 has a double-pipe structure, and the water flowing through the outer flow path is heated by heat exchange with the heating heat medium flowing through the inner flow path. The recirculation circuit 372 includes a water level sensor 374 that detects the water level in the bathtub 600, a water flow switch 376 that detects the presence or absence of a water flow, and a thermistor 378 that detects the temperature of water flowing from the recirculation circuit 372 toward the bathtub 600. Is provided.

  The heating heat medium flowing from the second heating return pipe 404 into the hot water supply / heating unit 300 joins the heating heat medium from the heat exchanger 312 and then passes through the sub heat exchanger 380 of the heating heat source unit 310 to be heated. It is sent to the circulation pump 304. A part of the heating heat medium delivered from the heating circulation pump 304 flows to the low temperature heating forward pipe 414, and the rest is heated by the main heat exchanger 382 of the heating heat source unit 310 and then to the high temperature heating forward pipe 416. Flowing. In the main heat exchanger 382, sensible heat is absorbed from the combustion exhaust of the burners 338 and 340 to heat water. The sub heat exchanger 380 absorbs latent heat when water vapor in the combustion exhaust gas that has passed through the main heat exchanger 382 condenses and heats the water. The thermistor 384 detects the temperature of the heating heat medium sent out from the heating circulation pump 304, that is, the temperature of the heating heat medium sent out to the low-temperature heating forward piping 414. The thermistor 386 detects the temperature of the heating medium heated by the main heat exchanger 382, that is, the temperature of the heating medium sent to the high-temperature heating outlet pipe 416.

  When the electromagnetic valve 388 is opened, a part of the heating heat medium flowing from the main heat exchanger 382 toward the high-temperature heating outlet pipe 416 is supplied to the heat exchanger 312. In addition, a part of the heating heat medium flowing from the main heat exchanger 382 toward the high temperature heating outgoing pipe 416 passes through the first bypass pipe 392 and the second bypass pipe 394 provided with the bypass valve 390, and the heating circulation pump 304.

  The pressure gauge 397 detects the pressure of the heating heat medium. The air pool detection unit 398 uses the water level electrode 399 to detect the presence or absence of air pools in the heating medium.

  The hot water supply / heating controller 396 can communicate with the hot water storage controller 286, and a cooperative operation is realized between the hot water supply / heating unit 300 and the hot water storage unit 200. Hot water supply / heating controller 396 can also communicate with remote controller 500.

  The heating system 400 includes a low temperature heating terminal 406 and a high temperature heating terminal 408. The low temperature heating terminal 406 is, for example, a floor heating device or a panel radiator. The heating heat medium flowing from the hot water supply / heating unit 300 via the low temperature heating outgoing pipe 414 is cooled by heat radiation at the low temperature heating terminal 406 and then sent to the first heating return pipe 402. The high temperature heating terminal 408 is, for example, a bathroom dryer or a fan convector. The heating heat medium sent from the hot water supply / heating unit 300 via the high temperature heating outgoing pipe 416 is cooled by heat radiation at the high temperature heating terminal 408 and then sent to the first heating return pipe 402. Each of the low temperature heating terminal 406 and the high temperature heating terminal 408 includes an opening / closing valve in the flow path of the heating medium, and opens / closes the opening / closing valve with the start / end of the heating operation. The heating heat medium sent from the heating system 400 to the first heating return pipe 402 is sent to the hot water storage unit 200 and heated, and then sent to the hot water supply and heating unit 300 via the second heating return pipe 404.

  An expansion tank 410 is connected to the heating system 400. The expansion tank 410 is a diaphragm type expansion tank, and absorbs the volume expansion of the heating medium due to the temperature rise of the heating medium. The expansion tank 410 is connected to the first heating return pipe 402.

  The remote controller 500 can communicate with the hot water supply / heating controller 396, the low temperature heating terminal 406, and the high temperature heating terminal 408. The user of the hot water supply / heating system 10 can set the hot water supply temperature, heating temperature, hot water temperature, reheating temperature, etc. via the remote controller 500, start and end of heating operation by the low temperature heating terminal 406, and high temperature heating terminal 408. Instructions such as the start and end of the heating operation, the start of hot water for the bathtub 600 and the reheating of the bath can be given.

  The heating operation of the hot water supply / heating system 10 of the present embodiment will be described. As an example, the case where the low temperature heating terminal 406 performs the heating operation and the high temperature heating terminal 408 does not perform the heating operation will be described. In such a low-temperature heating operation, the heating medium is heated so that the temperature of the heating medium sent to the low-temperature heating terminal 406 is about 50 ° C. That is, the set temperature of the heating medium to be supplied to the low temperature heating terminal 406 is 50 ° C. When the start of the low-temperature heating operation is instructed from the remote controller 500, the hot water storage unit 200 and the hot water supply / heating unit 300 perform the following operations, respectively.

  FIG. 2 shows the flow of control by the hot water storage controller 286. When the low-temperature heating operation is started, first, the operation state of the HP unit 100 is confirmed in step S202. If the HP unit 100 has stopped operating, the operation of the HP unit 100 is started.

  In step S204, it is confirmed whether or not the heating heat source unit 310 of the hot water supply and heating unit 300 is performing the combustion operation. When the heating heat source unit 310 is not performing the combustion operation (NO in step S204), the process proceeds to step S206, and the target heating temperature (HP target heating temperature) of the heating heat medium in the heat exchanger 204 is decreased. The temperature is set to 50 ° C. which is equal to the set temperature of the heating terminal 406. And it progresses to step S210, the pump 206 is driven, high temperature water is sent from the upper part of the hot water storage tank 202 to the heat exchanger 204, and the temperature of the heating heat medium detected by the thermistor 238 approaches the HP target heating temperature. Thus, the output of the pump 206 is increased or decreased. By increasing / decreasing the output of the pump 206, the flow rate of hot water sent from the upper part of the hot water storage tank 202 to the heat exchanger 204 is increased / decreased, thereby increasing / decreasing the heating amount for the heating heat medium in the heat exchanger 204. . When the heat radiation amount at the low temperature heating terminal 406 is sufficiently covered by the heating amount in the heat exchanger 204, the heating heat medium is heated to 50 ° C. in the heat exchanger 204. The heating heat medium heated to 50 ° C. by the heat exchanger 204 is sent to the hot water supply / heating unit 300 via the second heating return pipe 404, via the heating circulation pump 304 and the low temperature heating outgoing pipe 414, Supplied to the low temperature heating terminal 406. The heating medium whose temperature has decreased due to heat radiation at the low temperature heating terminal 406 is sent to the heat exchanger 204 of the hot water storage unit 200 via the first heating return pipe 402 and heated again.

  When the amount of heat released at the low temperature heating terminal 406 increases and the amount of heating at the heat exchanger 204 becomes insufficient, the heating medium cannot be heated to 50 ° C. by the heat exchanger 204. The temperature of the heating medium supplied to the terminal 406 gradually decreases. As will be described later, when the temperature of the heating heat medium supplied to the low-temperature heating terminal 406 decreases, the hot water supply / heating unit 300 starts heating the heating heat medium by the heating heat source unit 310.

  FIG. 3 shows a flow of control of the heating heat source unit 310 by 396 by the hot water supply / heating controller. In step S302, it is determined whether or not the temperature of the heating medium detected by the thermistor 384 has decreased to 45 ° C., which is the ignition temperature of the heating heat source unit 310. When the temperature detected by the thermistor 384 decreases to the ignition temperature (YES in step S302), the heating operation of the heating heat source unit 310 is started in step S304.

  When the heating heat source unit 310 starts the combustion operation, the heating amount that is insufficient only by the heat exchanger 204 is compensated by the heating amount in the heating heat source unit 310. The heating heat source device 310 controls the amount of heating so that the temperature of the heating heat medium detected by the thermistor 384 approaches the heat source device target heating temperature. In this embodiment, the heat source target heating temperature is set to 50 ° C., which is equal to the set temperature. The heating amount of the heating heat source unit 310 is adjusted by adjusting the opening degree of the gas proportional valve 324 and switching the opening and closing of the gas switching valves 338a and 340a. In the heating by the heating heat source device 310, the heating amount cannot be lowered to a lower number than the minimum number of the burners 338 and 340, and thus the heating amount cannot be finely adjusted. For this reason, the heating heat source unit 310 stops the combustion operation as follows when the temperature of the heating heat medium rises too much.

  In step S306, it is determined whether or not the temperature of the heating medium detected by the thermistor 384 has increased to 55 ° C., which is the fire extinguishing temperature of the heating heat source unit 310. When the temperature detected by the thermistor 384 rises to the fire extinguishing temperature (YES in step S306), the gas switching valves 338a and 340a are all closed in step S308, and the combustion operation of the heating heat source unit 310 is stopped.

  When the amount of heat released at the low temperature heating terminal 406 decreases, the temperature of the heating heat medium flowing through the first heating return pipe 402 (heating return temperature) increases accordingly. When the temperature of the heating heat medium flowing through the first heating return pipe 402 rises, the amount of heating in the heat exchanger 204 decreases accordingly, and the temperature rise of the heating heat medium detected by the thermistor 384 is moderate. Become. Therefore, even if the HP target heating temperature in the HP unit 100 and the hot water storage unit 200 is not changed even after the heating by the heating heat source device 310 is started, the thermistor 384 detects even if the heat radiation amount at the low temperature heating terminal 406 decreases. Therefore, the temperature of the heating medium for heating does not easily rise to the fire extinguishing temperature, and the combustion operation of the heating heat source unit 310 does not stop easily. From the viewpoint of energy efficiency, it is not preferable to continue heating by the heating heat source unit 310 even after the amount of heat released at the low-temperature heating terminal 406 is reduced.

  Therefore, in this embodiment, when it is determined in step S204 in FIG. 2 that heating by the HP unit 100 and the hot water storage unit 200 and heating by the heating heat source unit 310 are performed simultaneously (in the case of YES in step S204). In step S208, the HP target heating temperature is set to 55 ° C., which is higher than 50 ° C., which is the set temperature of the low-temperature heating terminal 406. With such a configuration, thermistor 384 detects when the amount of heat released from the low-temperature heating terminal 406 decreases in the situation where the heating by the HP unit 100 and the hot water storage unit 200 and the heating by the heating heat source unit 310 are performed simultaneously. The temperature of the heating medium to be heated rises quickly to the fire extinguishing temperature of the heating heat source unit 310. When the amount of heat released at the low-temperature heating terminal 406 decreases, the combustion operation of the heating heat source unit 310 can be quickly stopped.

  In this embodiment, as shown in steps S204 and S206 of FIG. 2, after the heating heat source device 310 stops the combustion operation, the HP target heating temperature is lowered to 50 ° C. again. As a result, when the heat radiation amount at the low temperature heating terminal 406 increases again, the temperature of the heating heat medium detected by the thermistor 384 is quickly lowered to the ignition temperature of the heating heat source unit 310, and the heating heat source unit 310 is combusted. Driving can be started quickly.

  When the hot water storage tank 202 runs out and only the low temperature water is stored in the upper part of the hot water storage tank 202, the pump 206 is stopped to finish the heating in the heat exchanger 204, and only the heating heat source device 310 is used. To heat the heating medium. In the present embodiment, when the heating operation is performed only by the heating heat source unit 310 as described above, the difference between the ignition temperature and the extinguishing temperature of the heating heat source unit 310 is set to be larger. As shown in step S402 to step S408 of FIG. 4, in this embodiment, when the heating operation is performed only with the heating heat source unit 310, the ignition temperature and the fire extinguishing temperature are reset to 43 ° C. and 57 ° C., respectively. By adopting such a configuration, it is possible to reduce the number of repetitions of ignition and extinguishing when the heating heat source device 310 heats the heating medium alone. By reducing the number of times the heating heat source unit 310 is ignited and extinguished, it is possible to suppress the aging of parts such as the igniter 344 and the gas switching valves 338a and 340a, and to extend the product life.

  As described above, the hot water supply and heating system 10 of the present embodiment includes the HP unit 100 and the hot water storage unit 200 (corresponding to a heat pump heating mechanism) that heat the heating medium using the heat absorbed from the atmosphere, A heating heat source device 310 that heats a heating heat medium using heat generated by combustion, and a low-temperature heating terminal 406 (corresponding to a heating device) that heats using heat radiation from the heating heat medium are provided. . The HP unit 100 and the hot water storage unit 200 are configured to heat the heating medium so as to reach a predetermined HP target heating temperature (50 ° C. in the present embodiment). The heating heat source unit 310 starts heating the heating medium when the temperature of the heating medium supplied to the low-temperature heating terminal 406 decreases to a predetermined ignition temperature (45 ° C. in this embodiment). When the temperature of the heating heat medium supplied to the heater rises to a predetermined fire extinguishing temperature (55 ° C. in this embodiment), the heating of the heating heat medium is stopped. The hot water supply and heating system 10 increases the HP target heating temperature in the HP unit 100 and the hot water storage unit 200 when the heating heat source device 310 starts heating the heating medium (in this embodiment, the HP target heating temperature is increased from 50 ° C.). Raised to 55 ° C.).

  Moreover, the hot water supply / heating unit 10 of the present embodiment lowers the HP target heating temperature in the HP unit 100 and the hot water storage unit 200 when the heating heat source device 310 stops heating the heating medium (in this embodiment, the HP target heating temperature). The heating temperature is lowered from 55 ° C. to 50 ° C.).

  In addition, the hot water supply and heating unit 10 of the present embodiment includes an ignition temperature (45 ° C. in this embodiment) and a fire extinguishing temperature (45 ° C. in this embodiment) in a situation where the HP unit 100 and the hot water storage unit 200 are heating the heating medium. In this embodiment, the difference of 55 ° C. is the ignition temperature (43 ° C. in this embodiment) of the heating heat source unit 310 and the fire extinguishing temperature (main) in the situation where the HP unit 100 and the hot water storage unit 200 are not heating the heating medium. The embodiment is characterized in that it is set smaller than the difference of 57 ° C.).

  As mentioned above, although the Example of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

DESCRIPTION OF SYMBOLS 10 Hot water supply and heating system 100 HP unit 102 Compressor 104 Radiator 106 Expansion mechanism 108 Evaporator 110 Pump 112 Circulation return piping 114 Circulation return piping 116 Fan 118, 120, 218, 222, 224, 226, 228, 230, 232, 234 238, 254, 268, 271, 280, 364, 366, 378, 384, 386 Thermistor 122 HP controller 200 Hot water storage unit 202 Hot water storage tank 204 Heat exchanger 206 Pump 208 Circulation lower piping 210, 212 Three-way valve 214 Circulation upper piping 216 Circulation bypass piping 236, 248, 260, 360 Flow meter 240 Bypass piping 242, 262, 266, 278, 362 Flow control valve 250 Check valve 246 First water supply pipe 252 Governor 256 Tank water supply pipe 258 Second supply Water pipe 264 Tank outlet pipe 270 First hot water pipe 272 Second hot water pipe 274 First hot water connection pipe 276 Second hot water connection pipe 282 Solenoid valve 284 Bypass pipe 286 Hot water storage controller 300 Hot water supply heating unit 302 Gas heat source unit 304 Heating circulation pump 306 Bath Circulation pump 308 Hot water supply heat source device 310 Heating heat source device 312 Heat exchanger 314 Gas flow path 316 Gas source valve 318 Hot water supply gas flow path 320 Heating gas flow path 322, 324 Gas proportional valves 326, 328, 330, 338, 340 Burner 326a, 328a, 330a, 338a, 340a Gas switching valve 332, 342 Fan 334, 344 Igniter 336, 346 Frame rod 348, 380 Sub heat exchanger 350, 382 Main heat exchanger 352 Bypass piping 354 Bypass control valve 356 First hot water supply heat source machine Piping 3 8 Second hot water supply heat source machine pipe 368 Hot water pipe 370 Pouring solenoid valve 372 Reheating circulation path 374 Water level sensor 376 Water flow switch 388 Electromagnetic valve 390 Bypass valve 392 First bypass pipe 394 Second bypass pipe 396 Hot water supply heating controller 397 Pressure gauge 398 Air accumulation detector 399 Water level electrode 400 Heating system 402 First heating return pipe 404 Second heating return pipe 406 Low temperature heating terminal 408 High temperature heating terminal 410 Expansion tank 414 Low temperature heating outgoing pipe 416 High temperature heating outgoing pipe 500 Remote control 600 Bathtub

Claims (3)

A heat pump heating mechanism that heats the heating medium using heat absorbed from the atmosphere;
A heat source machine that heats a heating medium using heat generated by the combustion of fuel;
A heating system comprising a heater for heating using heat radiation from a heating medium,
The heat pump heating mechanism is configured to heat the heating medium so as to reach a predetermined target heating temperature,
The heat source unit starts heating the heating medium when the temperature of the heating medium supplied to the heater is lowered to a predetermined ignition temperature, and the temperature of the heating medium supplied to the heater is It is configured to stop heating the heating medium when the temperature rises,
A heating system characterized by raising a target heating temperature of a heat pump heating mechanism when a heat source device starts heating a heating medium.   The heating system according to claim 1, wherein when the heat source unit stops heating the heating medium, the target heating temperature of the heat pump heating mechanism is lowered.   The difference between the ignition temperature and the extinguishing temperature of the heat source machine when the heat pump heating mechanism is heating the heating medium, the ignition temperature and the extinguishing temperature of the heat source machine when the heat pump heating mechanism is not heating the heating medium The heating system according to claim 1, wherein the heating system is set smaller than the difference between the heating system and the heating system.

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