JP5542617B2 - Heating system - Google Patents

Description

  The present invention relates to a heating system.

  A heating system that heats water using a heat source such as 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.

  Patent Document 1 discloses a heating system using a heat pump. In this heating system, low-temperature water is sucked out from the bottom of the hot water storage tank, heated by a heat pump, and then hot water (hot water) is returned to the top of the hot water storage tank to boil the hot water storage tank. A temperature stratification is formed inside the hot water storage tank, a high-temperature water layer is formed at the top, and a low-temperature water layer is formed at the bottom. During the heating operation, high-temperature water is sucked out from the upper part of the hot water storage tank, and heat is exchanged with a low-temperature heating medium in the heat exchanger. The heating medium that has passed through the heat exchanger and has reached a high temperature is sent to the heating system to perform the heating operation. Moreover, the water which became low temperature through the heat exchanger is returned to the lower part of the hot water storage tank.

JP 2010-175150 A

  When the heating load in the heating system is high, it is necessary to increase the flow rate of the heating medium circulating through the heating system. The flow rate of the heating medium can be increased by increasing the number of revolutions of the heating circulation pump. However, the pressure loss when the heating medium passes through the heat exchanger that exchanges heat with the hot water from the hot water storage tank is large, and in order to increase the flow rate of the heating medium, a large pump with high capacity is required. It was necessary to use it as a heating circulation pump. Even if the capacity of the heating circulation pump is low, a technology capable of circulating a heating medium with a large flow rate is expected.

  The present invention solves the above problems. According to the present invention, in a heating system that heats a heating medium by exchanging heat with hot water stored in a hot water storage tank through a heat exchanger, even if the capacity of the heating circulation pump is low, a large amount of heating heat is supplied. A technology capable of circulating the medium to the heating system is provided.

The present invention is embodied as a heating system. The heating system includes a heat exchanger that exchanges heat between hot water and a heating heat medium, a hot water storage tank that stores hot water, and sucks hot water from the hot water storage tank, passes through the heat exchanger, and passes into the hot water storage tank. A tank circulation pump to be returned; a heating circulation pump that circulates a heating medium between the heat exchanger and the heating system; and a heating medium from the heating system that bypasses the heat exchanger to the heating system A return path, a flow rate measuring unit that measures the flow rate of the heating medium flowing into the heat exchanger, and a flow rate adjusting unit that adjusts the flow rate of the heating medium flowing through the bypass path are provided. The heating system further includes hot water inflow temperature measuring means for measuring the temperature of hot water flowing into the heat exchanger, hot water outflow temperature measuring means for measuring the temperature of hot water flowing out of the heat exchanger, and the heat exchanger. Heating inflow temperature measuring means for measuring the temperature of the heating heat medium flowing into the heating chamber, heating outflow temperature measuring means for measuring the temperature of the heating heat medium flowing out from the heat exchanger, and the flow rate measuring means Based on the flow rate, the temperature measured by each of the hot water inflow temperature measuring means, the hot water outflow temperature measuring means, the heating inflow temperature measuring means and the heating outflow temperature measuring means, and the operating state of the tank circulation pump, An abnormality diagnosis means for diagnosing the presence or absence of abnormality in the flow rate measurement means is provided.

When controlling the flow rate adjusting means based on the flow rate measured by the flow rate measuring means, if an abnormality occurs in the flow rate measuring means, the accurate flow rate cannot be measured, and the flow rate adjusting means cannot be controlled appropriately. End up. However, it is generally difficult to find out the occurrence of abnormality in the flow rate measuring means. Therefore, in the above heating system, paying attention to the heat balance between the heating heat medium and hot water in the heat exchanger, the presence or absence of abnormality in the flow rate measuring means is diagnosed. The heat balance between the heating medium and the hot water in the heat exchanger is the temperature of the hot water flowing into the heat exchanger, the temperature of the hot water flowing out of the heat exchanger, the flow rate of the hot water flowing through the heat exchanger, It can be calculated from the temperature of the heating medium flowing into the heat exchanger, the temperature of the heating medium flowing out of the heat exchanger, and the flow rate of the heating medium flowing through the heat exchanger. The flow rate of the hot water flowing through the heat exchanger can be estimated from the operating state of the tank circulation pump. According to the above heating system, it is possible to appropriately diagnose the occurrence of abnormality in the flow rate measuring means.

In the heating system, the heating medium is heated based on the flow rate measured by the flow rate measuring unit and the temperature measured by each of the heating inflow temperature measuring unit and the heating outflow temperature measuring unit. Based on the temperature measured by each of the heating water inflow temperature measuring means and the warm water outflow temperature measuring means, and the operating state of the tank circulation pump. The flow rate measurement by comparing the amount of heat calculated by the hot water calorie calculation means with the amount of heat calculated by the warm water calorie calculation means, and the amount of heat calculated by the hot water calorie calculation means for calculating the amount of heat released when passing through the heat exchanger. It is preferable to diagnose the presence or absence of abnormality in the means.

When the flow rate measuring means is measuring a normal and accurate flow rate, the amount of heat received when the heating medium passes through the heat exchanger and the amount of heat released when the hot water passes through the heat exchanger as described above. When they are calculated and compared, there is almost no difference. However, when an abnormality occurs in the flow rate measuring means and an accurate flow rate cannot be measured, a large difference occurs in the calorie calculated as described above. According to the above heating system, it is possible to appropriately diagnose whether or not an abnormality has occurred in the flow rate measuring means.

In the above heating system, it is preferable to control the flow rate adjusting means so that the flow rate of the heating heat medium measured by the flow rate measuring means approaches a predetermined reference flow rate.

In the above heating system, when the flow rate of the heating medium flowing into the heat exchanger from the heating system is lower than the reference flow rate, the flow rate adjusting means is controlled to reduce the flow rate of the heating medium flowing through the bypass path. . When the flow rate of the heating medium flowing into the heat exchanger from the heating system exceeds the reference flow rate, the flow rate adjusting means is controlled to increase the flow rate of the heating medium flowing through the bypass path. When such control is performed, when the flow rate of the heating medium circulating through the heating system is smaller than the reference flow rate, the heating medium that flows into the heat exchanger so that the heating medium does not flow through the bypass path. Thus, the heating medium can be efficiently heated. Further, when the flow rate of the heating medium circulating through the heating system is larger than the reference flow rate, the heating medium with the reference flow rate is allowed to flow into the heat exchanger, and the remaining heating medium is allowed to flow into the bypass path. The pressure loss when the heating medium is returned from the heating system to the heating system via the heat exchanger and the bypass pipe can be reduced. Even if the capacity of the heating circulation pump is low, a heating medium having a large flow rate can be circulated in the heating system.

  According to the present invention, in a heating system that heats a heating heat medium by exchanging heat with hot water stored in a hot water storage tank via a heat exchanger, even if the capacity of the heating circulation pump is low, heating with a large flow rate is performed. The heating medium can be circulated through the heating system.

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 supply 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 CO ₂ or HFC.
(Characteristic 3) An auxiliary heat source device for heating the heating medium with combustion heat is provided.

  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, in addition to HFC (hydrofluorocarbon) which is an alternative chlorofluorocarbon, CO ₂ which is a natural refrigerant can be used. Further, as the expansion mechanism 106, a cavity tube or the like can be used in addition to the expansion valve.

  When the HP unit 100 boils the hot water storage tank 202, the HP circulation pump 110 is driven to suck water from the lower part of the hot water storage tank 202 of the hot water storage unit 200 through the circulation forward 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 the operations of the compressor 102, the fan 116, and the HP circulation pump 110 according to 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 tank circulation 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. The thermistor 218 detects the temperature of water near the top of the hot water storage tank 202. The thermistor 222 detects the temperature of the water in the upper part of the hot water storage tank 202. The thermistor 224 detects the temperature of the water in the intermediate part of the hot water storage tank 202.

  When the HP unit 100 performs the boiling operation of the hot water storage tank 202, the low-temperature water at the lower part of the hot water storage tank 202 passes through the circulation lower pipe 208, the three-way valve 210, and the circulation forward pipe 112 to the HP unit 100. Sent. 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 of the three-way valves 210 and 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, the three-way valve 210, and the circulation. It can also be circulated so as to return to the HP unit 100 again via the 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 tank circulation pump 206 is driven, high-temperature water is sucked from the upper part of the hot water storage tank 202 and sent to the heat exchanger 204. In addition, although an air pool may exist near the top of the hot water storage tank 202, in this embodiment, heat exchange is performed from a height slightly lower than the top of the hot water storage tank 202 so that the tank circulation pump 206 does not engage with air. Hot water is delivered to the vessel 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 operations of the tank circulation 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 outputs of 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 and 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.

  Hereinafter, the heating operation of the hot water supply / heating system 10 of the present embodiment will be described with reference to FIG. The HP unit 100, the hot water storage unit 200, and the hot water supply / heating unit 300 cooperate to perform the following operations. In the state before starting the heating operation, the opening degree of the flow rate adjustment valve 242 of the hot water storage unit 200 is fully closed.

  In step S202, the process waits until the heating operation switch of the remote controller 500 is turned on. When the heating operation switch of remote controller 500 is turned ON (YES in step S202), tank circulation pump 206 of hot water storage unit 200 is driven in step S204. Thereby, hot water (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 that has radiated heat in the heat exchanger 204 and has become low temperature is returned to the bottom of the hot water storage tank 202.

  In step S206, the HP unit 100 starts the boiling operation of the hot water storage tank 202. Specifically, in the HP unit 100, the compressor 102 and the fan 116 are driven, and the HP circulation pump 110 is further driven. As a result, low-temperature water is sucked out from the bottom of the hot water storage tank 202 and sent to the HP unit 100. The water heated to a high temperature by the HP unit 100 is returned to the top of the hot water storage tank 202.

  In step S208, the heating circulation pump 304 of the hot water supply / heating unit 300 is driven. Thereby, the hot medium for heating is sent from the hot water supply / heating unit 300 to the heating system 400. The heating medium that has radiated heat in the heating system 400 to a low temperature is sent to the heat exchanger 204 of the hot water storage unit 200. The heating medium heated to a high temperature by the heat exchanger 204 is returned to the hot water supply / heating unit 300.

In step S210, the heat exchange inlet flow Q _m of the heating heat medium to be measured by the flow meter 236, it is determined whether more than a predetermined reference flow rate Q _0. In this embodiment, the reference flow rate Q ₀ is 13 liters / min. If (YES in step S210) to heat exchange incoming flow _{Q m} is greater than the reference flow rate _{Q 0} is to increase the opening of flow control valve 242 in step S212, the process proceeds to step S218. When the heat exchange inlet flow _{Q m} does not exceed the reference flow rate _{Q 0} (NO in step S210), the process proceeds to step S214.

At step S214, the heat exchange inlet flow _{Q m} as measured by the flow meter 236, to determine whether it is below the reference flow _{Q 0.} If (YES in step S214) to heat exchange incoming flow _{Q m} is below the reference flow rate _{Q 0} is reduced the opening of flow control valve 242 in step S216, the process proceeds to step S218. When the heat exchange inlet flow _{Q m} is not less than the reference flow rate _{Q 0} (NO in step S214), the process proceeds to step S218.

  In step S218, the flow meter 236 is diagnosed for an abnormality. In this embodiment, the presence or absence of abnormality in the flow meter 236 is diagnosed using the flow rate measured by the flow meter 236, the temperature measured by the thermistors 230, 232, 234, and 238, and the rotation speed of the tank circulation pump 206. To do.

Considering the heat balance in the heat exchanger 204, the amount of heat q ₁ received when the heating medium passes through the heat exchanger 204 is given by q ₁ = C ₁ × (T _B −T _A ) × Q _m . Here, C ₁ is the specific heat of the heating medium, T _A is the heat input temperature of the heating medium measured by the thermistor 234, and T _B is the heating medium measured by the thermistor 238. It is the thermal AC output temperature, and Q _m is the flow rate of the heating medium passing through the heat exchanger 204 measured by the flow meter 236. The amount of heat q ₂ released when hot water from the hot water storage tank 202 passes through the heat exchanger 204 is given by q ₂ = C ₂ × (T ₁ −T ₂ ) × Q _p . Here, C ₂ is the specific heat of hot water, T ₁ is the hot AC heat input temperature measured by the thermistor 230, T ₂ is the hot AC heat AC output temperature measured by the thermistor 232, and Q _p Is the flow rate of hot water passing through the heat exchanger 204. The flow rate Q _p of hot water passing through the heat exchanger 204 is given by Q _p = K × N. Here, K is a proportionality constant, and N is the rotation speed of the tank circulation pump 206.

Since heat loss in the heat exchanger 204 is small, the amount of heat q ₁ received when the heating medium passes through the heat exchanger 204 is the amount of heat q ₁ received from the hot water storage tank 202 through the heat exchanger 204. it should be substantially equal to the amount of heat q ₂ to release upon. However, when abnormality such as clogging in the flow meter 236 is caused to generate the flow rate Q _m as measured by the flow meter 236 becomes inaccurate, heat q ₁ and heat q ₂ differ value calculated as described above It becomes. Therefore, in this embodiment, the calorie q ₁ and the calorie q ₂ are calculated as described above, and q ₁ is significantly smaller than q ₂ (for example, q ₁ is less than half of q ₂ ). In this case, it is determined that an abnormality has occurred in the flow meter 236.

  If it is determined in step S218 that there is an abnormality in the flow meter 236 (in the case of YES), the abnormality is notified to the user via the remote controller 500 in step S220, and the process proceeds to step S222. If it is determined that there is no abnormality in the flow meter 236 (NO in step S218), the process proceeds to step S222 as it is.

  In step S222, it is determined whether or not the heating operation switch is turned off. If the heating operation switch is not turned off (NO in step S222), the process returns to step S210. When the heating operation switch is turned off (YES in step S222), the process proceeds to step S224.

  In step S224, the heating circulation pump 304 is stopped. In step S226, the opening degree of the flow rate adjustment valve 242 is fully closed. In step S228, the HP controller 124 of the HP unit 100 stops the HP circulation pump 110, and stops the compressor 102 and the fan 116. In step S230, the tank circulation pump 206 is stopped and the process returns to step S202.

As described above, in the hot water heating system 10 of the present embodiment, when performing the heating operation, when the heat exchange inlet flow Q _m is below the reference flow rate Q ₀ is reduced to opening of the flow rate adjusting valve 242 Thus, the flow rate of the heating medium flowing through the bypass pipe 240 is decreased. Further, if it exceeds the heat exchange incoming flow Q _m is the reference flow rate Q ₀ is to increase the opening of flow control valve 242 to increase the flow rate of the heating heat medium flowing through the bypass pipe 240. When such control is performed, when the flow rate of the heating medium sent from the first heating return pipe 402 to the hot water storage unit 200 is smaller than the reference flow rate, the opening degree of the flow rate adjustment valve 242 is reduced to the fully closed state. The entire amount of the heating medium can be flowed into the heat exchanger 204, and the heating medium can be efficiently heated. When the flow rate of the heating medium transferred from the first heating return pipe 402 to the hot water storage unit 200 is larger than the reference flow rate, the opening degree of the flow rate adjusting valve 242 is adjusted to heat the heating medium with the reference flow rate. The heat is transferred to the exchanger 204 and the remaining heating medium is allowed to flow into the bypass pipe 240. Thereby, the pressure loss of the heating heat medium when flowing from the first heating return pipe 402 to the second heating return pipe 404 through the hot water storage unit 200 can be reduced. Even if the capacity of the heating circulation pump 304 is not so high, a heating medium having a large flow rate can be circulated in the heating system 400.

  Further, in the hot water supply and heating system 10 of the present embodiment, the occurrence of an abnormality in the flow meter 236 is caused by the measured value of the flow meter 236, the measured values of the thermistors 230, 232, 234, and 238, and the rotation speed of the tank circulation pump 206. Based on this, a diagnosis can be made. The flow meter 236 is likely to be clogged. If an abnormality occurs, the flow rate cannot be measured accurately, and as a result, the flow rate adjustment valve 242 cannot be properly controlled. However, in the hot water supply and heating system 10 according to the present embodiment, when an abnormality occurs in the flow meter 236, the user can be prompted to maintain the flow meter 236 by notifying the user via the remote controller 500.

Note in the above example, the hot water flow rate Q _p passing through the heat exchanger 204, but is calculated based on the rotational speed N of the tank circulating pump 206, in addition to this, the driving of the tank circulating pump 206 it may calculate the flow rate Q _p based on power may be calculated flow rate Q _p, based on the duty ratio of the tank circulating pump 206.

  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 achieving one of the objects itself has technical utility.

DESCRIPTION OF SYMBOLS 10 Hot water supply / heating system 100 HP unit 102 Compressor 104 Radiator 106 Expansion mechanism 108 Evaporator 110 HP circulation 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 Tank circulation 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 rate adjustment valve 250 Check valve 246 First water supply pipe 252 Governor 256 Tank Water pipe 258 Second water supply pipe 264 Tank hot water supply pipe 270 First hot water supply pipe 272 Second hot water supply pipe 274 First hot water supply connection pipe 276 Second hot water supply 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 machine 310 Heating heat source machine 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 pipe 358 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 Bypass valve 392 First bypass pipe 394 Second bypass pipe 396 Hot water 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 exchanger that exchanges heat between the hot water and the heating medium;
A hot water storage tank for storing hot water,
A tank circulation pump that sucks out hot water from the hot water storage tank, passes the heat exchanger and returns the hot water to the hot water storage tank;
A heating circulation pump for circulating a heating medium for heating between the heat exchanger and the heating system;
A bypass path that bypasses the heat exchanger and returns the heating medium from the heating system to the heating system;
Flow rate measuring means for measuring the flow rate of the heating medium flowing into the heat exchanger;
Flow rate adjusting means for adjusting the flow rate of the heating heat medium flowing through the bypass path ;
Hot water inflow temperature measuring means for measuring the temperature of hot water flowing into the heat exchanger;
Hot water outflow temperature measuring means for measuring the temperature of hot water flowing out of the heat exchanger;
Heating inflow temperature measuring means for measuring the temperature of the heating medium flowing into the heat exchanger;
Heating outflow temperature measuring means for measuring the temperature of the heating medium flowing out of the heat exchanger;
The flow rate measured by the flow rate measuring means, the temperature measured by each of the hot water inflow temperature measuring means, the hot water outflow temperature measuring means, the heating inflow temperature measuring means and the heating outflow temperature measuring means, and the tank circulation A heating system comprising abnormality diagnosis means for diagnosing the presence or absence of abnormality in the flow rate measurement means based on the operating state of the pump. Received when the heating heat medium passes through the heat exchanger based on the flow rate measured by the flow rate measuring means and the temperatures measured by the heating inflow temperature measuring means and the heating outflow temperature measuring means, respectively. A heating calorific value calculating means for calculating a calorific value;
Based on the temperature measured by each of the hot water inflow temperature measuring means and the hot water outflow temperature measuring means and the operating state of the tank circulation pump, the amount of heat released when the hot water passes through the heat exchanger is calculated. It further comprises a hot water calorie calculation means,
The abnormality diagnosis unit diagnoses the presence or absence of an abnormality in the flow rate measurement unit by comparing the heat amount calculated by the heating heat amount calculation unit with the heat amount calculated by the hot water heat amount calculation unit. Heating system. The heating system according to claim 1 or 2, wherein the flow rate adjusting unit is controlled so that a flow rate of the heating heat medium measured by the flow rate measuring unit approaches a predetermined reference flow rate.

Images