JP4847502B2 - Hot water storage hot water supply system - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply system, and more particularly to a hot water storage type hot water supply system including a heat pump unit and a burner unit.

  Conventionally, a hot water tank for storing hot water inside, a water supply pipe for supplying water into the hot water tank, a hot water pipe for supplying hot water stored in the hot water tank, and the hot water drawn from the hot water tank to be heated and boiled 2. Description of the Related Art A hot water storage type hot water supply system including a heat pump unit that returns hot water to a hot water storage tank and a burner unit that is an instantaneous auxiliary heat source is known. The heat pump unit is very high in energy efficiency, but has a low heating capacity per unit time, and therefore cannot cope with sudden hot water supply. Therefore, in order to prevent running out of hot water, a burner unit that operates when hot water has run out is provided as an instantaneous auxiliary heat source. As a result, the hot water storage tank can be downsized.

In such a hot water storage type hot water supply system, the operation operation of the heat pump and the burner unit is performed by an operation input to one remote controller (see Patent Documents 1 to 3). This remote control is provided with an operation switch for instructing ON / OFF of the operation of the entire hot water storage hot water supply system. When the operation switch is turned OFF, the operation of the heat pump and the burner unit is immediately stopped, and then the operation switch Until the is turned ON, the operation stop state of the heat pump and the burner unit is maintained.
JP 2001-41570 A JP 2004-125226 A Japanese Patent Application Laid-Open No. 11-148731

  A user who lives in a residence where a hot water storage type hot water supply system is installed turns off the operation switch when the residence is absent for a long period (for example, three days or more). Thereby, in spite of the absence of the user, the waste of energy consumption due to boiling of the hot water in the hot water tank by the heat pump at the set time every day is suppressed. However, depending on the user, the operation switch is turned OFF even when the residence is temporarily absent. In this case, even if the user returns to the residence and turns on the operation switch, it takes time to boil with the heat pump, so a large amount of hot water supply such as hot water filling is performed by the burner unit, and the energy consumption increases. there were. Although it is conceivable to provide a long-term absence switch that is turned on when the user is absent for a long period of time, there are two switches for instructing to stop the operation, resulting in a problem that the operability by the user is poor.

  In view of the above circumstances, the present invention is a hot water storage hot water supply system in which the operation of the heat pump and the burner unit is input from one operation switch, and the hot water storage hot water supply system capable of reducing energy consumption as a whole is provided. The purpose is to provide.

  The hot water storage hot water system according to the present invention includes a hot water storage tank for storing hot water therein, a water supply pipe for supplying water into the hot water storage tank, a hot water supply pipe for supplying hot water stored in the hot water storage tank, and the hot water supply. A temperature setting means for setting the temperature of the hot water supplied from the pipe to a first temperature; a heat pump unit for deriving and heating the hot water from the hot water tank; and returning the heated hot water to the hot water tank; and the hot water pipe A burner unit that heats the hot water when the hot water supplied to the temperature is lower than the first temperature, and a stop operation input means that is operated to input a stop instruction for maintaining the heat pump unit and the burner unit in an operation stop state. A start time setting means for setting a start time for starting the operation of the heat pump unit, and within a predetermined time when the start time comes after the stop instruction is operated and input. Then, the control means for starting the operation of the heat pump unit, boiling the hot water in the hot water storage tank to the second temperature not lower than the first temperature, and maintaining the heat pump unit in the operation stop state again. It is characterized by providing.

  Since this hot water storage type hot water supply system includes only one stop operation input means for inputting a stop instruction for maintaining the heat pump unit and the burner unit in the operation stop state, the operability by the user is good. And even if the user who lives in the residence where the hot water storage type hot water supply system is installed inputs the stop instruction from the stop operation input means, if within a predetermined time, the heat pump unit operates at the start time. Start and boil the hot water in the hot water tank. When the residence is absent for a long time, the user inputs a stop instruction from the stop operation input means. In this case, the heat pump unit does not start operation after the predetermined time has elapsed even when the start time is reached. Therefore, it is possible to prevent the heat pump unit from boiling the hot water in the hot water tank every day for a long period when the user is absent, and to suppress energy consumption accompanying the operation of the heat pump unit. On the other hand, when the residence is absent for a short period of time, even if the user inputs a stop instruction from the stop operation input means, if within a predetermined time, the heat pump unit starts operation when the start time is reached, Boil the hot water in the hot water tank. Therefore, a large amount of hot water supply after the user returns to the residence can be prevented from being performed by the burner unit, and energy consumption accompanying the operation of the burner unit can be suppressed.

  Therefore, when the absence for a long period and the absence for a short period are mixed, for example, energy consumption can be reduced as a whole. For this reason, the stop operation input means is suitable for a device in which a stop instruction is operated and input for both long-term absence and short-term absence. The predetermined time may be set in consideration of the energy consumption of the heat pump unit and the burner unit, the possibility of absence in the long term, the number of days absent in the long term, and the like. By setting the start time in consideration of the time when a large amount of hot water supply is required, such as hot water filling, the possibility of a large amount of hot water supply being performed by the burner unit is reduced, so that energy consumption can be further reduced. Become.

  By the way, if the operation of the heat pump unit is stopped before boiling the hot water in the hot water tank to the second temperature, the hot water temperature distribution in the hot water tank becomes abnormal. Since the heat pump unit can boil only from a low temperature, it is impossible to boil all hot water in the hot water tank to the second temperature when the heat pump unit subsequently boils. There is a possibility of adverse effects such as. Therefore, it is preferable that the operation of the heat pump unit does not stop until the hot water in the hot water tank is boiled to the second temperature even when a stop instruction is input.

  Therefore, in the hot water storage type hot water supply system according to the present invention, when the stop instruction is operated and input from the operation stop input means during the operation of the heat pump unit, the control means has the heat pump unit in the hot water storage tank. It is preferable to maintain the heat pump unit in an operation stop state after boiling hot water to the second temperature.

  In addition, if the second temperature is changed before the hot water in the hot water tank is boiled to the second temperature, the hot water temperature distribution in the hot water tank becomes abnormal. Thereafter, when boiling is performed by the heat pump unit, there is a possibility that all the hot water in the hot water tank is adversely affected such that it becomes impossible to boil up to the second temperature after the setting change. Therefore, even when the setting of the second temperature is changed, it is preferable to continue the operation of the heat pump unit until the hot water in the hot water tank is boiled to the second temperature before the setting change.

  Therefore, the hot water storage hot water supply system according to the present invention includes a temperature setting means for setting the second temperature, and the control means uses the temperature setting means to operate the second temperature during operation of the heat pump unit. When the setting is changed, it is preferable to cause the heat pump unit to boil the hot water in the hot water storage tank to the second temperature set before the start of the operation of the heat pump unit.

  A hot water storage hot water supply system according to an embodiment of the present invention will be described with reference to the drawings.

  A hot water storage type hot water supply system 1 according to the present embodiment includes a hot water storage unit 2, a heat pump unit 3, a burner unit 4, and a remote controller 5, as shown in a schematic overall configuration diagram in FIG.

  The hot water storage unit 2 includes a hot water storage tank 11, a water supply pipe 12, a hot water supply pipe 13, a hot water storage controller 14, and the like.

  The hot water storage tank 11 keeps hot water in its interior and stores it, and its capacity is small enough to store hot water required for one day, for example, 50 to 200 liters. A lower hot water temperature sensor 15 and an upper hot water temperature sensor 16 for detecting the temperature of hot water are respectively provided at the lower and upper portions in the hot water storage tank 11. Furthermore, a safety valve 17 is provided at the upper part of the hot water tank 11 to prevent the internal pressure of the hot water tank 11 from exceeding the pressure resistance. Furthermore, a drain valve 18 is provided at the bottom of the hot water tank 11, and the hot water in the hot water tank 11 can be drained by an operator manually opening the drain valve 18.

  One end of the water supply pipe 12 communicates with the water supply via the water supply port 19, and the other end communicates with the lower part of the hot water tank 11, and supplies water to the lower part of the hot water tank 11. The water supply pipe 12 is provided with a pressure reducing valve 20 to prevent the internal pressure of the hot water storage tank 11 from becoming excessive. The water supply pipe 12 communicates with the hot water supply pipe 13 via the water control valve 21, and the water control valve 21 adjusts the supply of water to the hot water supply pipe 13. The flow rate of the water supplied to the hot water supply pipe 13 is measured by the water amount sensor 22, and the water temperature is measured by the water temperature sensor 23. One end of the hot water supply pipe 13 communicates with the hot water supply port 24 and the other end communicates with the upper part of the hot water tank 11, and the hot water stored in the upper part of the hot water tank 11 is adjusted in flow rate by the hot water control valve 25. 24 is supplied to a kitchen, a washroom, a shower in the bathroom, and the like. The flow rate of hot water supplied to the hot water supply pipe 13 is measured by the hot water amount sensor 26, and the hot water temperature is measured by the hot water temperature sensor 27. Further, the hot water supply pipe 13 is provided with a bypass pipe 28 (28a, 28b) that circulates through the burner unit 4 on the downstream side of the connection portion of the water supply pipe 12 with the branch pipe. The temperatures of hot water flowing immediately upstream of the bypass outgoing pipe 28a and downstream of the bypass return pipe 28b are measured by the hot water temperature sensor 29 and the mixed hot water temperature sensor 30, respectively. Further, the hot water supply pipe 13 is provided with a bypass control valve 31 between the connection portion between the bypass outgoing pipe 28a and the bypass return pipe 28b, and the bypass control valve 31 controls the amount of hot water supplied to the bypass outgoing pipe 28a. It is adjusted.

  The hot water storage controller 14 is connected to a remote controller 5 incorporating a clock 32 and a burner controller 79 described later. The hot water storage controller 14 is based on setting information input to the remote controller 5, measurement information from various sensors in the hot water storage hot water supply system 1, current time information from the clock 32, and the like. 25 and operation control of the bypass control valve 31 and the like are performed.

  The heat pump unit 3 draws and heats hot water from the hot water storage tank 11 and returns the heated hot water to the hot water storage tank 11. The evaporator 41, the heat medium circulation pipe 42, the compressor 43, the expansion valve 44, A condenser 45, a hot water circulation pipe 46, a circulation pump 47, a heat pump controller 48, and the like are provided.

  The evaporator 41 has a fan 50 that is rotated by driving of the electric motor 49, and between the air supplied by the rotation of the fan 50 and the heat medium passing through the heat medium circulation pipe 42 in the evaporator 41. Heat exchange takes place. Here, hydrofluorocarbon (HFC), which is an alternative chlorofluorocarbon, is used as the heat medium. However, other heat medium, for example, chlorofluorocarbon other than HFC, carbon dioxide, or the like may be used. The compressor 43 is provided on the downstream side of the evaporator 41 of the heat medium circulation pipe 42, and is discharged from the evaporator 41 to compress the heat medium and send it to the condenser 45 as high pressure and high temperature. The expansion valve 44 is provided upstream of the evaporator 41 in the heat medium circulation pipe 42 and releases the pressure of the heat medium pressurized by the compressor 43. The defrost valve 51 is provided in the bypass pipe 52 of the heat medium circulation pipe 42 and defrosts the evaporator 41 with the heat medium discharged from the compressor 43. A heat medium temperature sensor for measuring the temperature of the heat medium flowing in the heat medium circulation pipe 42 on the upstream side and the downstream side of the expansion valve 44 of the heat medium circulation pipe 42 and on the upstream side and the downstream side of the compressor 43, respectively. 53, 54, 55, and 56 are provided. The heat medium temperature sensor 53 is not always necessary. Further, the evaporator 41 is provided with an air temperature sensor 57 that measures the temperature of the air sucked into the evaporator 41.

  The condenser 45 heat-exchanges and heats the hot water in which the heat medium that has been set to high pressure and high temperature in the evaporator 41 passes through the hot water circulation pipe 46. The low temperature hot water or water stored in the lower part of the hot water storage tank 11 is guided to the condenser 45 through the hot water circulation pipe 46 by the circulation pump 47, and is heat-exchanged and heated by the condenser 45 to become high temperature hot water. And returned to the upper part of the hot water tank 11. Thereby, hot water is stored in the upper part of the hot water tank 11. Hot water temperature sensors 58 and 59 for measuring the temperature of hot water flowing in the hot water circulation pipe 46 are provided on the upstream side and the downstream side of the condenser 45 of the hot water circulation pipe 46, respectively. Further, the condenser 45 is provided with an atmospheric temperature sensor 60 for measuring the internal atmospheric temperature. The ambient temperature sensor 60 is not always necessary.

  The heat pump controller 48 is connected to the hot water storage controller 14. The heat pump controller 48 performs operation control of the compressor 43, the circulation pump 47, the electric motor 50, and the like based on input information from the hot water storage controller 14, measurement information from various sensors in the heat pump unit 3, and the like. Further, the heat pump controller 48 transmits measurement information from various sensors in the heat pump unit 3 to the hot water storage controller 14.

  The burner unit 4 heats hot water supplied from the bypass pipe 28, and burner 71, can body 72, fuel gas supply pipe 73, hot water supply heat exchanger 74, additional heat exchanger 75, and water supply pipe 76. , A hot water supply pipe 77, a memory circulation pipe 78, a burner controller 79, and the like.

  The burner 71 is composed of a plurality of hot water supply burners 71a and memorial burners 71b having different combustion amounts. The amount of combustion of the entire hot water supply burner 71a can be adjusted by the combination of the hot water supply burner 71a that burns. The burner 71 is accommodated in the can body 72, and the exhaust due to the combustion of the burner 71 is exhausted from the opening at the upper end of the can body 72 through the exhaust passage. A spark plug 81 for igniting the burner 71 is provided in the can body 72, and the spark plug 81 is operated by an igniter 82.

  Fuel gas is supplied to the burner 71 through a fuel gas supply pipe 73. The fuel gas supply pipe 73 is provided with an original gas on-off valve 83 and a gas proportional valve 84 in order from the upstream side. Further, the fuel gas supply pipe 73 is branched into a plurality of paths downstream of the gas proportional valve 84, and each path is connected to the hot water supply burner 71 a and the additional burner 71 b via the gas on-off valve 85.

  The hot water supply heat exchanger 74 communicates with the water supply pipe 76 and the hot water supply pipe 77, heats the water supplied from the water supply pipe 76 by heat generated by the hot water supply burner 71a, and supplies hot water from the hot water supply pipe 77. To do. One end of the water supply pipe 76 is connected to the bypass outgoing pipe 28a of the hot water storage unit 2, and water is supplied through the bypass outgoing pipe 28a. One end of the hot water supply pipe 77 is connected to the bypass return pipe 28b of the hot water storage unit 2, and hot water is supplied from the hot water supply port 24 through the bypass return pipe 28b. The water supply pipe 76 is provided with a water stop valve 86 and a water amount sensor 87 in that order from the upstream side. The water supply pipe 76 and the hot water supply pipe 77 are communicated with each other by a bypass pipe 88, and the bypass pipe 88 is provided with a water amount adjustment valve 89 that adjusts the amount of water flowing in the bypass pipe 88. On the downstream side of the hot water supply heat exchanger 74 of the hot water supply pipe 77 and the downstream side of the connection portion with the bypass pipe 88, hot water supply temperature sensors 90 and 91 for measuring the temperature of the hot water flowing in the hot water supply pipe 77 are provided. . As described above, when there is no hot water in the hot water storage tank 11, the water supplied from the water supply pipe 76 through the bypass outward pipe 28 a is heat-exchanged and heated by the hot water supply heat exchanger 74 to become hot water. And is supplied from the hot water supply port 24 through the hot water supply pipe 77 and the bypass return pipe 28b.

  The memorial heat exchanger 75 is provided in the middle of the memorial circulation pipe 78, and heat-exchanges and heats hot water flowing through the memorial circulation pipe 78 by heat generated by the memorial burner 71b. The memorial circulation pipe 78 is configured such that both ends thereof are connected to the bathtub 6, and hot water in the bathtub 6 is sucked from one end by the bath pump 92 and returned to the bathtub 6 from the other end. A hot water temperature sensor 93 that measures the temperature of hot water flowing in the additional circulation pipe 78 is provided on the downstream side of the additional heat exchanger 75 in the additional circulation pipe 78. In addition, hot water flow sensors 94 and 95 for measuring the amount of hot water flowing in the memorial circulation pipe 78 are provided near both ends of the memorial circulation pipe 78. Further, a hot water supply pipe 96 that guides hot water to the bathtub 6 is connected to the hot water supply pipe 77 downstream of the hot water supply temperature sensor 91. The pouring pipe 96 guides hot water supplied from the hot water supply pipe 77 into the bathtub 6 through the memory circulation pipe 78. The pouring pipe 96 is provided with a pouring electromagnetic valve 97, a pouring amount sensor 98, and a check valve 99. The pouring solenoid valve 96 adjusts the pouring amount, the pouring amount sensor 98 measures the amount of hot water flowing through the pouring pipe 96, and the check valve 99 prevents the hot water from flowing back through the pouring pipe 96. Thus, when hot water is in the hot water storage tank 11, hot water is supplied to the bathtub 6 through the bypass forward pipe 28 a, the water supply pipe 76, the bypass pipe 88, the pouring pipe 96 and the recirculation circulation pipe 78, and the hot water filling is performed. Is to be done.

  The burner controller 79 is connected to the hot water storage controller 14 and the remote controller 5. The burner controller 79 is based on input information from the hot water storage controller 14 or the remote controller 5 and measurement information from various sensors in the burner unit 4. The igniter 82, the original gas on-off valve 83, the gas proportional valve 84, the gas on-off valve 85, the water stop valve 86, the water amount adjusting valve 89, the bath pump 92, the pouring electromagnetic valve 97, and the like are controlled. Further, the heat pump controller 49 transmits measurement information and the like from various sensors in the burner unit 4 to the hot water storage controller 14 and the remote controller 5.

  The remote controller 5 is connected to the hot water storage controller 14 and the burner controller 79 so as to be able to communicate with each other, and is an operation switch (stop operation input) for inputting an ON (operation) / OFF (stop) instruction of the hot water storage hot water supply system 1. Means) 5a, a setting switch (temperature setting means) 5b, etc., through which the switching of the set temperature (second temperature) S of the hot water in the hot water tank 11 is input. When the ON instruction is input from the operation switch 5a, the heat pump unit 3 and the burner unit 4 are in the operating state or the operation standby state. When the OFF instruction is input from the operation switch 5a, the heat pump unit 3 and the burner unit 4 are In principle, the shutdown state is maintained. The temperature at which hot water in the hot water tank 11 is boiled up by the heat pump unit 3 is set to one of the set temperatures S of high temperature (for example, 60 degrees) or low temperature (for example, 45 degrees) by the setting switch 5b.

  When an ON instruction is input from the operation switch 5a, the heat pump unit 3 automatically starts operation at the start time T, and boils the hot water in the hot water tank 11 to the set temperature S set by the setting switch 5b. After that, the operation is stopped, and then the operation is on standby. Here, the start time T is a time at which the heat pump unit 3 starts to boil up in preparation for a large amount of hot water supply such as hot water filling the bathtub 6. The start time T is a predetermined time in consideration of a time (for example, 1 hour) required for boiling by the heat pump unit 3 in preparation for a time zone (for example, from 17:00 to 24:00) in which a large amount of hot water supply is likely to be performed. (For example, 16:00) is preset in a memory or the like in the hot water storage controller 14. The start time T may be set in consideration of learning, day of the week, season, temperature, family structure, and the like. The start time T may be a time set and input by the user from the remote controller 5. The start time T may be a plurality of times.

  By the way, the user who lives in the residence where the hot water storage type hot water supply system 1 is installed turns off the operation switch 5a when the residence is absent for a long period (for example, 3 days or more). Thereby, in spite of the absence of the user, the waste of energy consumption due to boiling of hot water in the hot water tank 11 by the heat pump unit 3 to the set temperature S at the start time T every day is suppressed. However, depending on the user, the operation switch 5a is turned off even when the residence is absent for a short period (for example, half a day). In this case, even if the user returns to the house and turns on the operation switch 5a, it takes time for the heat pump unit 3 to boil, so a large amount of hot water supply such as filling the bathtub 6 is performed by the burner unit 4, Energy consumption increases. Therefore, in the hot water storage type hot water supply system 1, even if the operation switch 5a is turned off, the heat pump unit 3 automatically starts operation at the start time T within a predetermined time (for example, 24 hours) after the OFF operation. Thus, the hot water in the hot water tank 11 is boiled up to the set temperature S. As a result, even when an OFF instruction is input from the operation switch 5a when the user is absent for a short period of time, the heat pump unit 3 automatically starts boiling at the start time T, thereby suppressing energy consumption. It becomes possible. Further, when the operation switch 5a is turned off when the user is absent for a long period of time, the heat pump unit 3 automatically starts boiling at the start time T only within a predetermined time thereafter, so that energy consumption is reduced. It is possible to suppress waste. Therefore, when the operation switch 5a is turned off, the subsequent energy consumption can be reduced as a whole.

  The predetermined time is set in advance in a memory or the like in the hot water storage controller 14 in consideration of energy consumption of the heat pump unit 3 and the burner unit 4. When the predetermined time is set to 24 hours, after that, the heat pump unit 3 is boiled only once at the start time T, and then the operation stop state of the heat pump unit 3 is maintained. Note that the predetermined time may be appropriately set by learning from the possibility that the user is absent for a long period of time, the number of days absent for a long period of time, and the like. The start time T may be a time set and input by the user from the remote controller 5. For example, when the operation switch 5a is turned OFF, in the case of a user who has been absent for more than 5 days and is absent for less than 1 day, assuming that the user is absent for a long time, the predetermined time is set to 8 hours, for example. do it. In addition, in the case of a user who often returns to the residence once every two days, the predetermined time may be set to 48 hours, for example, assuming that the user will return to the next day.

  Further, the operation switch 5 a may be turned off during the operation of the heat pump unit 3. However, if the heat pump unit 3 stops operating before hot water having the set temperature S is stored in the hot water tank 11, the hot water temperature distribution in the hot water tank 11 becomes abnormal. Since the heat pump unit 3 can only be boiled from a low temperature, it is impossible to boil all hot water in the hot water storage tank 11 to the set temperature S when the heat pump unit 3 is subsequently boiled. May be adversely affected. Therefore, in the hot water storage type hot water supply system 1, even when the operation switch 5a is turned off, the hot water in the hot water storage tank 11 is boiled up to the set temperature S when the heat pump unit 3 is in operation.

  The hot water storage controller 14 determines that the hot water in the hot water storage tank 11 has reached the set temperature S based on the temperatures measured by the lower water temperature sensor 15 and the hot water temperature sensor 16. Specifically, the hot water storage controller 14 measures the temperature of the hot water when the hot water temperature sensor 15 measures a temperature equal to or higher than the set temperature S and the hot water temperature sensor 15 measures a temperature equal to or higher than 40 degrees. It is determined that S has been reached. This is because it is difficult to keep the lower hot water at a high temperature due to the heat retaining performance of the hot water tank 11. The hot water storage controller 14 determines that there is no hot water storage when the hot water temperature sensor 15 measures a temperature lower than a predetermined temperature (first temperature) (for example, 40 degrees).

  Hereinafter, the control operation of the hot water storage type hot water supply system 1 by the hot water storage unit controller 14 when the user turns off the operation switch 5a will be described with reference to the flowchart of FIG. The control operations of the heat pump unit 3 and the burner unit 4 are performed via a heat pump controller 48 and a burner controller 79, respectively.

  When the operation switch 5a is turned off (STEP 1: YES), it is determined whether or not the heat pump unit 3 is in operation (STEP 2). When it is determined that the heat pump unit 3 is in operation (STEP 2: YES), the hot water in the hot water tank 11 is boiled to the set temperature S (STEP 3: YES), and then the operation of the heat pump unit 3 is stopped (STEP 4). .

  Then, it is determined whether or not a predetermined time (for example, 24 hours) has elapsed since the operation switch 5a was turned off (STEP 5). Within a predetermined time (STEP 5: NO), when the current time reaches the start time T (for example, 16:00) (STEP 6: YES), the operation of the heat pump unit 3 is started (STEP 7). After boiling the hot water to the set temperature S (STEP 8: YES), the operation of the heat pump unit 3 is stopped (STEP 9). On the other hand, when it is determined that a predetermined time has elapsed since the operation switch 5a was turned off (STEP 5: YES), the operation stop state of the heat pump unit 3 is maintained unless the operation switch 5a is turned on (STEP 10).

  Further, the setting temperature S may be changed by the setting switch 5b during operation of the heat pump unit 3. However, if the set temperature S is changed to the set temperature S1 during the operation of the heat pump unit 3, the hot water temperature distribution in the hot water tank 11 becomes abnormal. Moreover, the heat pump unit 3 cannot perform boiling when the temperature of the hot water in the hot water storage tank 11 is a low temperature (for example, 40 degrees) or more. Therefore, after that, when boiling is performed by the heat pump unit 3, there is a possibility that all the hot water in the hot water storage tank 11 cannot be boiled up to the set temperature S1. For example, if the setting temperature S is changed from the low temperature setting temperature S1 to the high temperature setting temperature S1 in the middle of boiling, the hot water at the low temperature setting temperature cannot be heated up. However, boiling of the lower hot water ends at a low set temperature. For this reason, not only the hot-water discharge property deteriorates, but also necessary hot water cannot be made and the number of start / stop increases, so that boiling cannot be performed efficiently. Therefore, in the hot water storage type hot water supply system 1, even if the setting switch 5b is used to change the set temperature S, the set temperature S is not changed when the heat pump unit 3 is in operation.

  Hereinafter, the control operation of the hot water storage type hot water supply system 1 by the hot water storage unit controller 14 when the user inputs the change setting of the set temperature S with the setting switch 5b will be described with reference to the flowchart of FIG.

When an instruction to change the set temperature S to the set temperature S1 is input from the setting switch 5b (STEP 11: YES), it is determined whether or not the heat pump unit 3 is in operation (STEP 12). When it is determined that the heat pump unit 3 is in operation (STEP 12: YES), the hot water in the hot water tank 11 is boiled to the set temperature S before the change (STEP 3: YES), and then the operation of the heat pump unit 3 is stopped. Thereafter, the setting is changed to the set temperature S1 (STEP 15). On the other hand, when it is determined that the heat pump unit 3 is not in operation (STEP 12: NO), the setting is immediately changed to the set temperature S1 (STEP 15).
In the hot water storage type hot water supply system 1 described above, the case where the set temperature S is set to one of two temperatures, the high temperature and the low temperature, has been described. However, the classification of the set temperature S is not limited to this. For example, even if it has three or more preset temperatures, for example, the preset temperature S may be set in units of 1 degree.

  Even when the operation switch 5a is turned off, if the heat pump unit 3 starts operation at the start time T and controls the hot water in the hot water tank 11 to boil up within a predetermined time from the OFF operation. explained. However, it may be controlled such that the heat pump unit 3 starts operation and boils the hot water in the hot water tank 11 only once at the start time after the operation switch 5a is turned OFF. This is the same operation as when the predetermined time is 24 hours. However, after the heat pump unit 3 has boiled the hot water in the hot water storage tank 11, the operation of the hot water storage hot water supply system 1 is completely turned off, and it is not necessary to monitor the current time, so that the control becomes easy.

1 is a schematic overall configuration diagram of a hot water storage type hot water supply system according to an embodiment of the present invention. The operation | movement flowchart of the hot water storage type hot-water supply system when the operation switch is turned off. The operation | movement flowchart of the hot water storage type hot-water supply system when the setting change of setting temperature is operated and input with a setting switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water storage type hot water supply system, 2 ... Hot water storage unit, 3 ... Heat pump unit, 4 ... Burner unit, 5 ... Remote control, 5a ... Operation switch (stop operation input means), 5b ... Setting switch (temperature setting means), 6 ... Bathtub , 11 ... Hot water storage tank, 12 ... Water supply pipe, 13 ... Hot water supply pipe, 14 ... Hot water storage controller (control means, start time setting means), 15 ... Lower water temperature sensor, 16 ... Hot water temperature sensor, 28 (28a, 28b) DESCRIPTION OF SYMBOLS ... Bypass pipe, 32 ... Clock, 41 ... Evaporator, 42 ... Heat medium circulation pipe, 43 ... Compressor, 44 ... Expansion valve, 45 ... Condenser, 46 ... Hot water circulation pipe, 48 ... Heat pump controller (control means), 71 (71a, 71b) ... burner, 72 ... can body, 73 ... fuel gas supply pipe, 74 ... hot water supply heat exchanger, 76 ... water supply pipe, 77 ... hot water supply pipe, 79 ... burner controller (control means).

Claims (3)

A hot water tank for storing hot water inside,
A water supply pipe for supplying water into the hot water tank;
A hot water supply pipe for supplying hot water stored in the hot water storage tank;
Temperature setting means for setting the temperature of hot water supplied from the hot water supply pipe to a first temperature;
A heat pump unit that draws and heats hot water from the hot water tank and returns the heated hot water to the hot water tank;
A burner unit that heats the hot water when the hot water supplied to the hot water supply pipe is lower than the first temperature;
A stop operation input means for operating and inputting a stop instruction for maintaining the heat pump unit and the heat exchanger unit in an operation stop state;
Start time setting means for setting a start time for starting operation of the heat pump unit;
When the start time is reached after the stop instruction is input, if it is within a predetermined time, the operation of the heat pump unit is started, and the hot water in the hot water tank is set to a second temperature equal to or higher than the first temperature. And a control means for maintaining the heat pump unit in an operation-stopped state again after being heated to the above temperature.   When the stop instruction is input from the operation stop input unit during operation of the heat pump unit, the control unit causes the heat pump unit to boil hot water in the hot water storage tank to the second temperature. The hot water storage hot water supply system according to claim 1, wherein the heat pump unit is maintained in an operation stop state. Temperature setting means for setting the second temperature;
The control means sets the hot water in the hot water storage tank to the heat pump unit before the operation of the heat pump unit is started when the second temperature is changed by the temperature setting means during the operation of the heat pump unit. The hot water storage hot water supply system according to claim 1 or 2, wherein the hot water is boiled to the second temperature.

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