JP6607769B2 - Thermal equipment - Google Patents

Description

  The technology disclosed in this specification relates to a thermal apparatus.

  Patent Document 1 discloses a thermal apparatus that heats a heat medium with a burner. The thermal device of Patent Document 1 has a normal operation in which the power supply source is a commercial power supply and a power suppression operation in which the power supply source is a secondary battery. During the power suppression operation, the thermal device is operated at a suppression power lower than the maximum power consumption during normal operation of the thermal device.

JP2013-88060A

  As a means for heating the heat medium, there is a thermal apparatus including a heat pump heat source that consumes electric power and heats the heat medium. In such a thermal device, as compared with a thermal device that heats the heat medium with a burner as in Patent Document 1, the electric power required to heat the heat medium becomes larger. In addition, even in such a thermal device, for example, due to a disaster, the power supply from the commercial power supply is stopped, and the power from the secondary battery is supplied to the thermal device during normal operation and normal operation. It is preferable to have a power suppression operation for operating the thermal equipment with a suppression power lower than the maximum power consumption. When the supply of power from the commercial power supply is stopped, the time until the commercial power supply is restored after that cannot be predicted. In addition, when the power supply from the commercial power supply is stopped, the secondary battery cannot be charged. For this reason, when electric power is supplied from the secondary battery to the thermal device, it is preferable that the time during which the thermal device can operate by supplying power from the secondary battery is as long as possible. For this purpose, it is necessary to suppress the power consumption of the thermal equipment during the power suppression operation as much as possible. Therefore, in a thermal apparatus provided with a heat pump heat source, a technique for suppressing power consumption of the thermal apparatus during power suppression operation is desired.

  In this specification, it is a thermal equipment provided with a heat pump heat source and an auxiliary heat source, and proposes a technology capable of suppressing the power consumption of the thermal equipment during the power suppression operation.

The heat equipment disclosed in this specification includes a heat pump heat source that consumes electric power to heat the heat medium, an auxiliary heat source that heats the heat medium by combustion of fuel, and a tank that stores the heat medium heated by the heat pump heat source. , Ru equipped with. Thermal equipment is used, the number usually the operation to be performed by thermal equipment, operates at a lower restraining power less than the maximum power dissipation during normal operation which is performed by the thermal device, the power restriction operation to be executed by hot equipment, doing. The thermal device includes a fuel detection unit that detects whether or not fuel is supplied to the auxiliary heat source, and the control device drives the heat pump heat source to heat the heat medium, and the heat medium heated by the heat pump heat source is supplied to the tank. While prohibiting the 1st heating operation to store, the 2nd heating operation which drives an auxiliary heat source, heats a heating medium, and supplies the heating medium heated by the auxiliary heat source to a use part, and driving of an auxiliary heat source The non-combustion hot water supply operation for supplying the heat medium stored in the tank to the use location can be executed, and the control device can execute the first heating operation during the power suppression operation. During the power suppression operation, when supplying the heat medium to the use location, if the fuel detection unit detects the supply of fuel to the auxiliary heat source, the non-combustion hot water supply operation is prohibited and the second heating operation is performed. Running heat medium Supplied to the use point.

According to the above configuration, when the supply of fuel to the auxiliary heat source is detected when supplying the heat medium during the power suppression operation, the control device prohibits the non-combustion hot water supply operation and performs the second heating. Run the operation. According to such a configuration, for example, when the power supply from the commercial power supply is stopped due to a disaster, but the supply of fuel to the auxiliary heat source is not stopped, the heating medium is heated using the auxiliary heat source, Consumption of the heat medium stored in the tank can be suppressed. By suppressing the consumption of the heat medium stored in the tank, the heat medium heated by the heat pump heat source thereafter can be reduced. That is, power consumption by the heat pump heat source can be suppressed. As a result, in the power suppression operation, the power consumption of the thermal device can be suppressed when the fuel is supplied to the auxiliary heat source.

The figure which shows typically the structure of the hot water supply system 2 which concerns on an Example. The flowchart which shows the electric power suppression process which the controller of the hot water supply system 2 which concerns on an Example performs. The flowchart which shows another electric power suppression process which the controller of the hot water supply system 2 which concerns on the modification 1 performs. The figure which shows typically the structure of the hot water supply system 2 which concerns on the modification 2. As shown in FIG. The figure which shows the structure of the hot water supply system 2 which concerns on the modification 3 typically.

  The main features of the embodiments described below are listed. The technical elements described below are independent technical elements and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Characteristic 1) When the control unit detects the supply of fuel to the auxiliary heat source by the fuel detection unit during the power suppression operation, the amount of heat of the heat medium stored in the tank by the first heating operation is the first. You may control a 1st heating operation so that it may become below a predetermined amount. The amount of heat referred to here is the amount of heat given to the heat medium stored in the tank by heating with a heat pump heat source.

  When fuel is supplied to the auxiliary heat source, the heating medium can be supplied by the second heating operation, so that it is not necessary to store a large amount of heat in the tank. According to the above configuration, when the first heating operation is executed by suppressing the heating amount of the heat medium by the first heating operation when fuel is supplied to the auxiliary heat source during the power suppression operation. Power consumption can be suppressed.

(Characteristic 2) In the power suppression operation, when the fuel detection unit detects the supply of fuel to the auxiliary heat source in the power suppression operation, the amount of heat of the heat medium stored in the tank by the first heating operation is the second place. You may control a 1st heating operation so that it may become more than fixed quantity.

  When the supply of fuel to the auxiliary heat source is interrupted while supplying the heating medium heated by the second heating operation, it is necessary to supply the heating medium heated by the first heating operation. In general, it takes a predetermined time to activate a heat pump heat source. For this reason, after the supply of fuel to the auxiliary heat source is interrupted, the heating medium heated to the target temperature by the first heating operation cannot be supplied unless a predetermined time has elapsed. According to the above configuration, when the electric power suppression operation is being performed and the fuel is supplied to the auxiliary heat source, the heated heat medium of the second predetermined amount or more is stored in the tank. For this reason, after the supply of fuel to the auxiliary heat source is interrupted and before the heat pump heat source is activated, the heat medium stored in the tank can be supplied.

  (Characteristic 3) When the fuel detection unit detects the supply of fuel to the auxiliary heat source during the power suppression operation, the control device performs the second heating even when the heated heat medium is stored in the tank. Operation may be performed and a heat medium may be supplied to a utilization location.

  According to said structure, when the fuel detection part detects supply of the fuel to an auxiliary heat source, a control apparatus performs a 2nd heating operation reliably. Thereby, consumption of the heat medium stored in the tank can be suppressed. By suppressing the consumption of the heat medium stored in the tank, the heat medium heated by the heat pump heat source thereafter can be reduced. That is, power consumption by the heat pump heat source can be suppressed. As a result, in the power suppression operation, the power consumption of the thermal device can be suppressed when the fuel is supplied to the auxiliary heat source.

(Characteristic 4) When supplying the heat medium during the power suppression operation, the control device executes the first heating operation when the fuel detection unit cannot detect the supply of fuel to the auxiliary heat source. A heat medium may be supplied.

  According to the above configuration, for example, when the supply of power from the commercial power supply is stopped due to a disaster and the supply of fuel to the auxiliary heat source is stopped, the heat medium can be heated using the heat pump heat source. For this reason, the heat medium can be supplied even when the fuel is not supplied to the auxiliary heat source during the power suppression operation.

(Characteristic 5) In the power suppression operation, the control device detects the first predetermined time from when the fuel detection unit cannot detect the fuel when the fuel detection unit cannot detect the fuel supply to the auxiliary heat source. after a lapse of the supply of fuel to the auxiliary heat source by fuel detection unit may determine whether or not is detected.

In some cases, the supply of fuel to the auxiliary heat source may be restored after the fuel detector cannot detect the supply of fuel to the auxiliary heat source and before the power from the commercial power source is restored. When the fuel supply is restored, it is preferable that the heating medium is heated by the second heating operation to suppress the power consumption of the thermal equipment during the power suppression operation. According to the above configuration, when the fuel supply to the auxiliary heat source is restored after the fuel detection unit cannot detect the fuel supply to the auxiliary heat source and before the power from the commercial power source is restored. Then, it is determined that the fuel supply to the auxiliary heat source is supplied by the fuel detection unit. Thereby, a 2nd heating operation can be performed and a heat carrier can be heated. As a result, it is possible to suppress the power consumption of the thermal device during power suppression.

(Characteristic 6) The fuel detection unit may include ignition detection means for detecting whether or not the auxiliary heat source has ignited. In this case, when the auxiliary heat source is driven, the control device may determine that the fuel is not supplied to the auxiliary heat source if the ignition detection means cannot detect the ignition of the auxiliary heat source.

  When fuel is supplied to the auxiliary heat source, driving the auxiliary heat source ignites the auxiliary heat source. According to said structure, it can be determined reliably whether the fuel is supplied to the auxiliary heat source using an ignition detection means.

(Feature 7) The fuel detection unit may include a flow meter that detects the flow rate of the fuel when the auxiliary heat source is driven. In this case, when the auxiliary heat source is driven, the control device may determine that the fuel is not supplied to the auxiliary heat source when the flow rate of the fuel detected by the flow meter is less than a predetermined flow rate.

  When fuel is supplied to the auxiliary heat source, when the auxiliary heat source is driven, gas flows to the auxiliary heat source. According to the above configuration, when the auxiliary heat source is driven, it is possible to determine whether or not the fuel is detected in the auxiliary heat source by using a flow meter that detects the flow rate of the fuel.

(Example)
As shown in FIG. 1, the hot water supply system 2 according to this embodiment includes an HP (heat pump) unit 4, a tank unit 6, and a burner unit 8.

  The HP unit 4 is a heat source that absorbs heat from outside air and heats water. The HP unit 4 includes a compressor 10, a condenser 12, an expansion valve 14, and an evaporator 16. The HP unit 4 circulates a refrigerant (for example, a fluorocarbon refrigerant) in the order of the compressor 10, the condenser 12, the expansion valve 14, and the evaporator 16, thereby absorbing heat from outside air and heating water. The compressor 10 pressurizes the refrigerant to a high temperature and a high pressure. The condenser 12 cools the refrigerant by exchanging heat with water. The expansion valve 14 depressurizes the refrigerant to low temperature and low pressure. The evaporator 16 heats the refrigerant by exchanging heat with the outside air. The HP unit 4 further includes a circulation pump 18 that circulates water through the condenser 12, a return thermistor 20 that detects the temperature of water flowing into the condenser 12, and a forward thermistor 22 that detects the temperature of water flowing out of the condenser 12. The outside temperature thermistor 23 for detecting the outside temperature and the HP controller 24 for controlling the operation of each component of the HP unit 4 are provided.

  The tank unit 6 includes a tank 30, a mixing valve 32, and a bypass control valve 34. The tank 30 is a sealed container that is covered with a heat insulating material and stores water therein. The capacity of the tank 30 of this embodiment is, for example, 100 liters. When the circulation pump 18 of the HP unit 4 is driven, water is sucked out from the bottom of the tank 30 and sent to the condenser 12. The water heated by the condenser 12 and having a high temperature is returned from the top of the tank 30 into the tank 30. When the water heated by the HP unit 4 flows into the tank 30, a temperature stratification is formed in the tank 30 in which a high-temperature water layer is stacked on a low-temperature water layer. An upper thermistor 36 that detects the temperature of the upper water, an intermediate thermistor 37 that detects the temperature of the intermediate water, and a lower thermistor 38 that detects the temperature of the lower water are attached to the tank 30. In this embodiment, the upper thermistor 36 is disposed at a position 10 liters from the top of the tank 30, the intermediate thermistor 37 is disposed at a position 30 liters from the top of the tank 30, and the lower thermistor 38 is disposed at the tank 30. 50 liters from the top of the. The state in which the tank 30 is filled with water heated by the HP unit 4 is referred to as a “full storage state”.

  Tap water is supplied to the tank unit 6 through the water supply path 40. In the water supply path 40, a pressure reducing valve 42 for reducing the water supply pressure and a water inlet thermistor 44 for detecting the water supply temperature are attached. The water supply path 40 branches into a tank water supply path 46 that communicates with the bottom of the tank 30 and a tank bypass path 48 that communicates with the mixing valve 32. Check valves 50 and 52 are attached to the tank water supply path 46 and the tank bypass path 48, respectively. Further, a water-side water amount sensor 54 that detects the flow rate of tap water flowing into the mixing valve 32 is attached to the tank bypass path 48. The top of the tank 30 and the mixing valve 32 communicate with each other via a tank hot water path 56. A check valve 58 and a hot water sensor 60 for detecting the flow rate of water from the tank 30 flowing into the mixing valve 32 are attached to the tank discharge path 56.

  The mixing valve 32 mixes the tap water flowing from the tank bypass passage 48 and the water from the tank 30 flowing from the tank discharge passage 56 and sends it out to the first hot water supply passage 62. The mixing valve 32 is driven by a stepping motor to adjust the opening degree on the tank bypass path 48 side (opening side on the water side) and the opening degree on the tank discharge path 56 side (opening side on the hot water side). A mixing thermistor 64 that detects the temperature of the water fed from the mixing valve 32 is attached to the first hot water supply path 62.

  Hot water is supplied from the tank unit 6 to hot water supply points such as a kitchen, a shower, and a currant through the second hot water supply path 66. A hot water supply outlet thermistor 68 that detects the temperature of water supplied to the hot water supply location and a check valve 70 are attached to the second hot water supply path 66. The first hot water supply path 62 and the second hot water supply path 66 communicate with each other through a hot water supply bypass path 72. A bypass control valve 34 is attached to the hot water supply bypass path 72.

  The tank unit 6 further includes a tank controller 74 and a remote controller 76 that can communicate with the tank controller 74. The tank controller 74 controls the operation of each component of the tank unit 6. The remote control 76 accepts various operation inputs from the user via switches, buttons, and the like. In addition, the remote controller 76 notifies the user of various types of information related to the settings and operations of the hot water supply system 2 by display and sound.

  The burner unit 8 includes a burner 80, a heat exchanger 82, a bypass servo 84, a water amount servo 86, and a hot water valve 88. The burner 80 is an auxiliary heat source machine that heats water flowing through the heat exchanger 82 by combustion of fuel gas. Fuel gas is supplied to the burner 80 via a gas supply pipe 81. Combustion air is fed into the burner 80 via an air supply pipe 83. An igniter 85 for igniting the burner 80 and a frame rod 87 for detecting the combustion state of the burner 80 are provided in the vicinity of the burner 80. Water from the first hot water supply path 62 of the tank unit 6 flows into the heat exchanger 82 via the burner forward path 90. The water that has passed through the heat exchanger 82 flows out to the second hot water supply path 66 of the tank unit 6 through the burner return path 92. A water quantity servo 86 for adjusting the flow rate of water flowing through the burner forward path 90 and a water quantity sensor 91 for detecting the flow rate of water flowing through the burner forward path 90 are attached to the burner forward path 90. The burner forward path 90 and the burner return path 92 communicate with each other via a burner bypass path 94. A bypass servo 84 is attached to a connection portion between the burner forward path 90 and the burner bypass path 94. The bypass servo 84 adjusts the flow rate of water flowing from the burner forward path 90 to the burner bypass path 94. A burner hot water thermistor 96 that detects the temperature of water flowing out of the heat exchanger 82 is attached to the burner return path 92. A hot water path 98 branches off from the burner return path 92. A hot water valve 88 is attached to the hot water path 98. Hot water is poured from the burner unit 8 to the bathtub, which is a hot water supply location, via the hot water path 98. The burner unit 8 further includes a burner controller 100 that controls the operation of each component of the burner unit 8.

  Electric power is supplied from the power supply unit 9 to the HP unit 4, the tank unit 6, and the burner unit 8 of the hot water supply system 2. The power supply unit 9 includes a distribution board 102, a storage battery 104, and a switch 106. The distribution board 102 is connected to a commercial power source 108, and distributes and supplies power supplied from the commercial power source 108 to the switch 106 and the storage battery 104. The storage battery 104 is a secondary battery such as a lithium ion secondary battery. The storage battery 104 can charge the power supplied from the commercial power supply 108 via the distribution board 102, and can discharge the charged power to the switch 106. The storage battery 104 has a built-in protection circuit (not shown), and the discharge to the switch 106 is cut off when the power to be discharged is equal to or higher than the upper limit discharge power (for example, 720 W). The switch 106 supplies power supplied from the commercial power source 108 via the distribution board 102 to the HP unit 4, the tank unit 6 and the burner unit 8, and supplies power supplied from the storage battery 104 to the HP unit 4, The state is switched between the states supplied to the tank unit 6 and the burner unit 8. In a situation where the power supply from the commercial power source 108 is normally performed, the switch 106 supplies the power supplied from the commercial power source 108 via the distribution board 102 to the HP unit 4, the tank unit 6, and the burner unit 8. Supply. In a situation where the power supply from the commercial power supply 108 is not normally performed, the switch 106 supplies the power supplied from the storage battery 104 to the HP unit 4, the tank unit 6 and the burner unit 8. Hereinafter, the operation state of the hot water supply system 2 when the power supply source is the commercial power supply 108 is referred to as “normal operation”, and the operation state of the hot water supply system 2 when the power supply source is the storage battery 104 is referred to as “power suppression operation”. " In the power suppression operation, the hot water supply system 2 operates at a suppression power (for example, 700 W) or less that is lower than the maximum power consumption during normal operation.

  The HP controller 24 and the tank controller 74 can communicate with each other. The tank controller 74 and the burner controller 100 can communicate with each other. Therefore, the hot water supply system 2 can perform various operations such as a boiling operation and a hot water supply operation by the HP controller 24, the tank controller 74, and the burner controller 100 performing control in cooperation. Hereinafter, the HP controller 24, the tank controller 74, and the burner controller 100 are collectively referred to simply as a controller.

  Below, the boiling operation and hot water supply operation which the hot water supply system 2 performs are demonstrated.

(Boiling operation)
In the boiling operation, the hot water supply system 2 drives the HP unit 4 to boil the water in the tank 30. The start timing of the boiling operation can be set from various viewpoints. For example, the controller may determine the start timing of the boiling operation so that the boiling of the water in the tank 30 ends immediately before the time period in which cheap midnight power can be used ends. Alternatively, the controller determines the start timing of the boiling operation so that the boiling of the water in the tank 30 is completed immediately before the time when a large demand for hot water supply is expected based on the actual hot water supply results up to the previous day. Also good. Alternatively, the controller may start the boiling operation when the user instructs the boiling of water in the tank 30 via the remote controller 76. Note that the controller adjusts the target heating amount TH by the boiling operation at every start timing of the boiling operation. The target heating amount TH can be calculated from the target temperature TA and the target heating water amount TW of water heated to the target temperature TA.

  When the boiling operation is started, the controller drives the compressor 10 to circulate the refrigerant in the order of the compressor 10, the condenser 12, the expansion valve 14, and the evaporator 16, and drives the circulation pump 18. The water is circulated between the tank 30 and the condenser 12. Thereby, the water sucked out from the bottom of the tank 30 is heated to the target temperature TA in the condenser 12 and returned to the top of the tank 30. When the target heating water amount TW in the water in the tank 30 is replaced with water heated to the target temperature TA, the controller ends the boiling operation.

(Hot water supply operation)
In the hot water supply operation, water at a hot water supply set temperature is supplied to the hot water supply location. When the flow rate detected by the water-side water amount sensor 54 and the flow rate detected by the hot water-side water amount sensor 60 (referred to as a hot water supply flow rate) is equal to or greater than the minimum operating flow rate (for example, 2.4 L / min). It is determined that the hot water supply has been started by opening the hot water supply location or hot water to the bathtub. Then, the controller executes the following non-combustion hot water supply operation or combustion hot water supply operation in accordance with the temperature detected by the upper thermistor 36.

  When the temperature detected by the upper thermistor 36 is equal to or higher than the hot water supply set temperature, the controller performs a non-combustion hot water supply operation. In the non-combustion hot water supply operation, the controller prohibits the combustion operation of the burner 80 and adjusts the opening of the mixing valve 32 so that the temperature detected by the mixing thermistor 64 becomes the hot water supply set temperature. Thus, water whose temperature is adjusted to the hot water supply set temperature is supplied to the hot water supply location.

  When the temperature detected by the upper thermistor 36 is lower than the hot water supply set temperature, the controller executes the combustion hot water supply operation. In the combustion hot water supply operation, the controller permits the burner 80 to perform the combustion operation, and mixes so that the temperature detected by the mixing thermistor 64 is lower than the hot water supply set temperature by the minimum heating capacity of the burner 80. The opening degree of the valve 32 is adjusted. In this case, the high temperature water supplied from the upper part of the tank 30 and the low temperature water supplied from the water supply path 40 are mixed in the mixing valve 32 and then heated to the hot water supply set temperature by the burner 80, so Supplied to.

  If the hot water flow rate falls below the minimum operating flow rate during the non-combustion hot water supply operation or combustion hot water supply operation described above, the controller determines that the hot water supply has been terminated due to the closure of the hot water supply location or the end of hot water to the bathtub. To end the hot water supply operation.

(Power suppression processing)
When the supply of power from the commercial power source 108 is stopped, the time until the commercial power source 108 is restored thereafter cannot be predicted. Therefore, when the hot water supply system 2 operates by receiving power supplied from the storage battery 104, it is preferable that the operable time by supplying power from the storage battery 104 be as long as possible. In order to lengthen the time during which the storage battery 104 can operate, it is necessary to suppress the power consumption of the hot water supply system 2. For this reason, a controller performs the process (electric power suppression process) for suppressing the power consumption of the hot water supply system 2. FIG. The power suppression process is a process for suppressing the power consumption of the hot water supply system 2 during the boiling operation and the hot water supply operation in the power suppression operation. Hereinafter, the power suppression process will be described.

  The power suppression processing executed by the controller will be described with reference to FIG. The power suppression process is started at the start of power supply and is continued during power supply.

  In step S <b> 2, the controller determines whether or not the power supply source is the storage battery 104. If the power supply source is the storage battery 104 (YES in step S2), the controller determines that the power suppression operation should be performed, and the process proceeds to step S4. If the power source is not the storage battery 104 (NO in step S2), the controller determines that it should operate in normal operation, and the process proceeds to step S12. In step S12, the controller executes normal operation. The normal operation is an operation for executing the above-described boiling operation and hot water supply operation.

  In step S4, the controller determines whether fuel gas is being supplied to the burner 80 or not. The controller opens the gas supply pipe 81 and the air supply pipe 83 in the burner 80 and performs ignition by the igniter 85, and then detects the supply of fuel gas to the burner 80 using the frame rod 87 (fuel detection operation). . Specifically, the controller determines that the fuel gas is supplied to the burner 80 when the ignition of the burner 80 can be detected by the frame rod 87.

  If fuel gas is being supplied to burner 80 (YES in step S4), the process proceeds to step S6. At the time when the process of step S6 is executed, the power supply from the commercial power source 108 is not normally performed, the power supply is performed from the storage battery 104 instead, and the fuel gas supply from the gas supply pipe 81 is performed. Is considered to be normal. In this case, in step S6, the controller performs the combustion hot water supply priority operation. In the combustion hot water supply priority operation, the controller permits the combustion hot water supply operation of the hot water supply system 2 and prohibits the non-combustion hot water supply operation of the hot water supply system 2. Accordingly, when the hot water supply system 2 supplies hot water thereafter, the hot water supply system 2 executes the combustion hot water supply operation regardless of the amount of heated water stored in the tank 30. For this reason, consumption of the heated water stored in the tank 30 is suppressed, and the heating amount in the HP unit 4 can be suppressed when the boiling operation is performed thereafter. Thereby, when the power suppression operation is in progress and the fuel gas is supplied to the burner 80, the power consumption when the hot water supply system 2 supplies hot water can be suppressed.

  In step S8, the controller sets a first predetermined amount as the upper limit of the target heating amount TH of water by the boiling operation. Specifically, the controller controls the heating amount of water by the boiling operation so as not to exceed the first predetermined amount by adjusting the target temperature TA and / or the target heating water amount TW. For example, in a normal operation, in the case of a boiling operation when the target temperature TA is 45 ° C. and the target heating water amount TW is 100 liters, the controller has a target temperature TA of 45 ° C. and a target heating water amount TW of 50 liters. Change to a certain boiling operation. In the power suppression operation, when the fuel gas is supplied to the burner 80, the controller performs the combustion hot water supply priority operation. For this reason, consumption of the heated water stored in the tank 30 is suppressed. Therefore, the heating amount by the boiling operation can be suppressed. As a result, the power consumption of the hot water supply system 2 can be suppressed by setting the target heating amount TH to be equal to or less than the first predetermined amount.

In step S <b> 10, the controller determines whether the power supply source is the commercial power source 108. That is, it is determined whether the commercial power source 108 has been restored. If the power source is the commercial power source 108 (YES in step S10), the process proceeds to S20 and returns to normal operation. On the other hand, when the power supply source is not the commercial power supply 108 (NO in step S10), the process returns to step S4 .

  If it is determined in step S4 that fuel gas is not supplied to the burner 80 (NO in step S4), the process proceeds to step S14. At the time when the process of step S14 is executed, power supply from the commercial power source 108 is not normally performed, power is supplied from the storage battery 104 instead, and fuel gas is supplied from the gas supply pipe 81. Is not considered to be normal. Note that the case where power is supplied from the storage battery 104 and the fuel gas is not normally supplied from the gas supply pipe 81 means that the supply of power from the commercial power supply is stopped and the burner 80 is caused by a disaster. This is the case where the supply of fuel gas is stopped simultaneously. In this case, in step S14, the controller performs non-combustion hot water supply priority operation. In the non-combustion hot water supply priority operation, the controller permits the non-combustion hot water supply operation of the hot water supply system 2 and prohibits the combustion hot water supply operation of the hot water supply system 2. Therefore, when the hot water supply system 2 supplies hot water thereafter, the hot water supply system 2 performs a non-combustion hot water supply operation. Thereby, even if the stop of the power supply from the commercial power supply and the stop of the supply of the fuel gas to the burner 80 occur simultaneously due to a disaster, the heated water can be supplied to the hot water supply location by the non-combustion hot water supply operation.

  In step S16, the controller cancels the upper limit of the target heating amount TH when the upper limit is set for the target heating amount TH. The case where the upper limit of the target heating amount TH is set is a case where the supply of fuel gas to the burner 80 is interrupted during the power suppression operation. If the upper limit of the heating amount is not set, the process skips step S16 and proceeds to step S18.

  Next, in step S <b> 18, the controller determines whether the power supply source is the commercial power supply 108. That is, it is determined whether the commercial power source 108 has been restored. If the power source is the commercial power source 108 (YES in step S18), the process proceeds to S20 and returns to normal operation.

  If the power source is not the commercial power source 108 (NO in step S18), the process proceeds to step S22. In step S22, the controller determines whether or not a predetermined time (for example, 24 hours) has elapsed since the previous fuel detection operation. If 24 hours have passed since the previous fuel detection operation, there is a high possibility that the supply of fuel gas from the gas supply pipe 81 to the burner 80 has been restored. For this reason, if it is determined that fuel gas is not supplied to the burner 80 by the previous fuel detection operation and 24 hours have elapsed, the process proceeds to step S4. That is, the fuel detection operation is executed again. Thus, when the supply of fuel gas from the gas supply pipe 81 to the burner 80 is restored before the power supply of the commercial power supply 108 is restored, the controller can switch from the non-combustion hot water supply priority operation to the combustion hot water supply priority operation. it can. As a result, the power consumption of the hot water supply system 2 during the power suppression operation can be suppressed.

  As described above, the hot water supply system 2 according to the present embodiment performs the combustion hot water supply priority operation when the power suppression operation is being performed and the fuel gas is supplied to the burner 80. That is, water is heated by the burner 80, and the heated water is supplied to the supply location. Further, hot water supply (non-combustion hot water supply operation) by the HP unit 4 is prohibited during the combustion hot water supply priority operation. Thereby, consumption of the water heated by the HP unit 4 stored in the tank 30 can be suppressed. By suppressing consumption of water heated by the HP unit 4 stored in the tank 30, the amount of water heated by the boiling operation can be suppressed. That is, the power consumed by the boiling operation can be suppressed. Thereby, in the power suppression operation, when fuel gas is supplied to the burner 80, the power consumption of the hot water supply system 2 can be suppressed.

  As described above, when the power suppression operation is in progress and the fuel gas is supplied to the burner 80, the water heated by the combustion hot water supply operation can be supplied, so that the tank 30 is heated so much. There is no need to store the collected water. For this reason, in the power suppression operation, when fuel gas is supplied to the burner 80, the power consumption when performing the boiling operation can be suppressed by suppressing the amount of water heated by the boiling operation. it can.

  Further, in this embodiment, when it is a power suppression operation and fuel gas is not supplied to the burner 80, the non-combustion hot water supply priority operation is executed. According to such a configuration, even when fuel gas is not supplied to the burner 80 during the power suppression operation, the water heated by the non-combustion hot water supply operation can be supplied to the hot water supply location.

  In the above embodiment, when a predetermined time (24 hours) elapses from the fuel detection operation during the power suppression operation, the controller executes the fuel detection operation again. Thus, when the supply of fuel gas to the burner 80 is restored after the fuel detection operation cannot detect the supply of the fuel gas to the burner 80 and before the power from the commercial power source 108 is restored. It is possible to detect that the supply of fuel gas to the burner 80 has been restored. Thereby, the controller can switch from non-combustion hot water supply priority operation to combustion hot water supply priority operation. As a result, the power consumption of the hot water supply system 2 during power suppression can be suppressed.

Here, the correspondence between the description of the embodiment and the description of the claims will be described. The hot water supply system 2 is an example of “thermal equipment”. Water is an example of a “heating medium”. Fuel gas is an example of “fuel”. A heat pump cycle including the compressor 10, the condenser 12, the expansion valve 14, and the evaporator 16 is an example of the “heat pump heat source”. The burner 80 is an example of an “auxiliary heat source”. The controller is an example of a “control device”. The frame rod 87 is an example of “ignition detection means”. Boiling up OPERATION is an example of the "first heating operation". The combustion hot water supply operation is an example of the “second heating operation”.

  Each embodiment has been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

(Variation 1) For example, when the supply of fuel gas to the burner 80 is interrupted while the combustion hot water supply priority operation during the power suppression operation is being executed, the heated water is stored in the tank 30 There is. In this case, the process shown in FIG. 3 may be executed instead of the process shown in FIG. Specifically, step S38 is added instead of step S8 in FIG. 2, and the second predetermined amount is set as the lower limit of the target heating amount TH of the boiling operation. Specifically, the controller controls the heating amount of water by the boiling operation to be equal to or more than the second predetermined amount by adjusting the target temperature TA and / or the target heating water amount TW. For example, in a normal operation, in a boiling operation where the target temperature TA is 45 ° C. and the target heating water amount TW is 10 liters, the controller has a target temperature TA of 45 ° C. and a target heating water amount TW of 30 liters. Change to boiling operation. In this case, step S46 is added instead of step S16. That is, in step S46, the controller cancels the lower limit of the heating amount set in step S38.

  The case where the supply of the fuel gas to the burner 80 is interrupted during execution of the combustion hot water supply priority operation during the power suppression operation will be described with reference to FIG. When the power suppression operation is performed and the fuel gas is supplied to the burner 80, the controller executes the combustion hot water supply priority operation (step S6). That is, the heating medium heated by the burner 80 is supplied to the hot water supply location. Thereafter, if the supply of fuel gas to the burner 80 is interrupted while the power suppression operation is being performed and the combustion hot water priority operation is being performed, the controller determines NO in step S4, and the combustion hot water priority operation is not performed. Switching to combustion hot water supply priority operation (step S14). That is, the drive of the burner 80 is stopped and the drive of the HP unit 4 is started. However, driving the HP unit 4 requires a predetermined time. For this reason, when the heated water is not stored in the tank 30, the heated water cannot be supplied to the hot water supply portion until the HP unit 4 is driven. However, in the first modification, even during the combustion hot water supply priority operation, the water heated by the boiling operation is stored in the tank 30 by a second predetermined amount or more. For this reason, until the HP unit 4 is activated, the heated water stored in the tank 30 can be used to supply the heated water to the hot water supply location.

(Modification 2) In the above embodiment, it is determined whether or not the fuel gas is supplied to the burner 80 by detecting the combustion state of the burner 80. However, it may be determined whether the fuel gas is supplied to the burner 80 based on the flow rate of the fuel gas flowing through the gas supply pipe 81 when the burner 80 is ignited. In this case, as shown in FIG. 4, a flow meter 180 attached to the gas supply pipe 81 and capable of detecting the flow rate of the fuel gas flowing through the gas supply pipe 81 may be used. The flow meter 180 is connected to the smart meter 120 and outputs the flow rate of the fuel gas to the smart meter 120. The smart meter 120 is connected to the burner controller 100 and transmits the flow rate of the fuel gas input from the flow meter 180 to the burner controller 100. That is, the flow rate of the fuel gas detected by the flow meter 180 is transmitted to the burner controller 100 via the smart meter 120.

  The fuel detection operation (step S4 in FIG. 2) when using the flow meter 180 will be described. In step S4, the controller (in detail, the burner controller 100) receives the flow rate of the fuel gas detected by the flow meter 180 when the gas supply pipe 81 is opened in the burner 80. The controller determines whether gas is supplied to the burner 80 based on the flow rate of the fuel gas received from the flow meter 180. Specifically, the controller determines that the fuel gas is supplied to the burner 80 when the flow rate of the fuel gas received from the flow meter 180 is equal to or higher than a predetermined flow rate (YES in step S4), and the flow rate of the fuel gas. Is less than the predetermined flow rate, it is determined that the fuel gas is not supplied to the burner 80 (NO in step S4). Note that both the frame rod 87 and the flow meter 180 may be used to determine whether or not the fuel gas is supplied to the burner 80. In this case, the controller opens the gas supply pipe 81 and the air supply pipe 83 and performs ignition by the igniter 85 in step S4.

(Modification 3) Further, it may be determined whether or not the fuel gas is supplied to the burner 80 by detecting the remaining amount of the gas cylinder 280 that is the supply source of the fuel to the burner 80. In this case, as shown in FIG. 5, a pressure sensor 282 attached to the gas supply pipe 81 and capable of detecting the gas pressure in the gas cylinder 280, and the fuel gas in the gas cylinder 280 based on the gas pressure detected by the pressure sensor 282 It is preferable to use a smart meter 220 capable of calculating the remaining amount. A gas supply valve 284 for adjusting the amount of fuel gas supplied from the gas cylinder 280 to the burner 80 is attached to the gas supply pipe. When the gas supply valve 284 is opened, the fuel gas is supplied from the gas cylinder 280 to the burner 80. When the gas supply valve 284 is closed, the supply of the fuel gas from the gas cylinder 280 to the burner 80 is stopped. The pressure sensor 282 is attached to the gas cylinder 280 side from the gas supply valve 89. For this reason, when the gas supply valve 89 is closed, the pressure sensor 282 can detect the gas pressure in the gas cylinder 280. The gas pressure detected by the pressure sensor 282 is transmitted to the smart meter 220. The smart meter 220 calculates the remaining amount of fuel gas in the gas cylinder 280 based on the gas pressure received from the pressure sensor 282. The smart meter 220 is connected to the burner controller 100 and transmits the remaining amount of fuel gas in the gas cylinder 280 to the burner controller 100.

  As is clear from the above description, when determining whether or not the fuel gas is supplied to the burner 80 using the smart meter 220 and the pressure sensor 282, the gas supply pipe 81 (specifically, the gas supply valve 284). Must be closed. For this reason, the controller executes the fuel detection operation (step S4 in FIG. 2) when the combustion hot water supply operation is not being executed. In step S <b> 4, the controller determines whether fuel gas is supplied to the burner 80 based on the remaining amount of fuel gas in the gas cylinder 280 received from the smart meter 220. Specifically, the controller determines that the fuel gas is being supplied to the burner 80 when the remaining amount of the fuel gas received from the smart meter 220 is equal to or greater than a predetermined amount (YES in step S4). When the remaining amount is less than the predetermined amount, it is determined that the fuel gas is not supplied to the burner 80 (NO in step S4). Note that, during the power suppression operation, the remote controller 76 may be provided with a manual heating switch that drives the HP unit 4 and puts the tank 30 in a fully charged state.

  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.

2: Hot water supply system 4: HP unit 6: Tank unit 8: Burner unit 9: Power supply unit 10: Compressor 12: Condenser 14: Expansion valve 16: Evaporator 18: Circulation pump 20: Return thermistor 22: Outward thermistor 23 : Outside temperature thermistor 24: HP controller 30: Tank 32: Mixing valve 34: Bypass control valve 36: Upper thermistor 37: Intermediate thermistor 38: Lower thermistor 40: Water supply path 42: Pressure reducing valve 44: Inlet thermistor 46: Tank supply path 48: Tank bypass path 50: Check valve 52: Check valve 54: Water side water quantity sensor 56: Tank hot water path 58: Check valve 60: Hot water side water quantity sensor 62: First hot water supply path 64: Mixing thermistor 66: First 2 Hot water supply path 68: Hot water supply outlet thermistor 70: Check valve 72: Hot water supply bypass Path 74: Tank controller 76: Remote controller 80: Burner 81: Gas supply pipe 82: Heat exchanger 83: Air supply pipe 84: Bypass servo 85: Igniter 86: Water quantity servo 87: Frame rod 88: Hot water valve 90: Burner forward path 91: Water quantity sensor 92: Burner return path 94: Burner bypass path 96: Burner hot water supply thermistor 98: Hot water path 100: Burner controller 102: Distribution board 104: Storage battery 106: Switch 108: Commercial power supply

Claims (5)

A heat pump heat source for heating the heat medium by consuming power, an auxiliary heat source for heating the heat medium by combustion of fuel, a tank for storing the heated heat medium in the heat pump heat source, a heat component must comprise a,
Thermal equipment
Usually the operation is performed by thermal equipment, operates at a lower restraining power less than the maximum power dissipation during normal operation which is performed by the thermal equipment, has a power restriction operation to be executed by hot equipment,
Thermal equipment
It has a fuel detector that detects the presence or absence of fuel supply to the auxiliary heat source,
The control device drives the heat pump heat source, heats the heat medium, stores the heat medium heated by the heat pump heat source in the tank, drives the auxiliary heat source, heats the heat medium, and heats the auxiliary heat source. The second heating operation for supplying the heat medium heated by the fuel to the use location and the non-combustion hot water supply operation for prohibiting the driving of the auxiliary heat source and supplying the heat medium stored in the tank to the use location are performed. Configured to be possible,
The control device
During the power suppression operation, the first heating operation can be executed,
During the power suppression operation, when supplying the heat medium to the use location, if the fuel detection unit detects the supply of fuel to the auxiliary heat source, the non-combustion hot water supply operation is prohibited and the second heating operation is executed. Thermal equipment that supplies the heat medium to the use location.   When the fuel detection unit detects the supply of fuel to the auxiliary heat source during the power suppression operation, the control device reduces the heat amount of the heat medium stored in the tank by the first heating operation to a first predetermined amount or less. The thermal apparatus of Claim 1 which controls 1st heating operation so that it may become.   When the fuel detection unit detects the supply of fuel to the auxiliary heat source during the power suppression operation, the control device causes the heat amount of the heat medium stored in the tank by the first heating operation to be equal to or greater than the second predetermined amount. The thermal apparatus of Claim 1 which controls 1st heating operation so that it may become. The control device performs the first heating operation and tanks the heat medium when the fuel detection unit cannot detect the supply of fuel to the auxiliary heat source when supplying the heat medium during the power suppression operation. The thermal device according to any one of claims 1 to 3 stored in When the fuel detection unit cannot detect the supply of fuel to the auxiliary heat source during the power suppression operation, the control device, after the first predetermined time has elapsed since the fuel detection unit could not detect the fuel , the fuel detection unit supplies fuel to the auxiliary heat source to determine whether the sensed, heat apparatus according to any one of claims 1 to 4.

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