WO2018003628A1 - Système d'alimentation en eau chaude - Google Patents

Système d'alimentation en eau chaude Download PDF

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Publication number
WO2018003628A1
WO2018003628A1 PCT/JP2017/022849 JP2017022849W WO2018003628A1 WO 2018003628 A1 WO2018003628 A1 WO 2018003628A1 JP 2017022849 W JP2017022849 W JP 2017022849W WO 2018003628 A1 WO2018003628 A1 WO 2018003628A1
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WO
WIPO (PCT)
Prior art keywords
water
hot water
temperature
mode control
circulation
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PCT/JP2017/022849
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English (en)
Japanese (ja)
Inventor
照男 西田
幸雄 松坂
晋司 吉川
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ダイキン工業株式会社
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Publication of WO2018003628A1 publication Critical patent/WO2018003628A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters

Definitions

  • the present invention relates to a hot water supply system.
  • water is heated using a heat pump that exchanges heat between refrigerant flowing in the refrigerant circuit and water, and the water is stored in a tank.
  • a heat pump that exchanges heat between refrigerant flowing in the refrigerant circuit and water
  • the water is stored in a tank.
  • 45 ° C. water (hot water) is transferred from the tank to a supply destination.
  • Sending hot water supply systems are widespread.
  • the tank water is circulated between the tank and the heat exchanger of the heat pump by a circulation pump. And when there is no remaining hot water (water above a predetermined temperature) in the tank, in order to quickly bring the water in the upper part of the tank to a high temperature, the temperature of the water after passing through the heat exchanger is set to the target value.
  • the pump and heat pump are controlled.
  • Patent Document 1 Japanese Patent Laid-Open No. 2001-415764
  • a combustion burner is provided between a faucet to which water is supplied and a tank, and the water in the tank is heated by a heat pump.
  • additional heating with a combustion burner is performed when higher temperature water is required.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2001-415764
  • the compressor of the heat pump is used. Control is made to operate at a high speed and to quickly boil the water in the tank. That is, the heat pump is operated with a high heating capacity so that the amount of hot water in the tank can be secured quickly.
  • An object of the present invention is to reduce running costs in a hot water supply system.
  • the hot water supply system supplies heated water to a supply destination.
  • the hot water supply system includes a hot water supply unit connected to a supply destination, a heat pump, a tank, a circulation channel, a combustion heating unit, one or a plurality of first temperature sensors, and a control unit.
  • the heat pump includes a heat exchanger that exchanges heat between the refrigerant and water, and a compressor that compresses the refrigerant.
  • the tank stores water heated by the heat exchanger.
  • the circulation channel has a circulation pump with variable output, and circulates water between the tank and the heat exchanger.
  • the combustion heating unit has combustion equipment. A combustion device burns fuel and heats water.
  • the one or more first temperature sensors detect the temperature of the water flowing through the circulation channel.
  • the control unit controls the heat pump, the circulation pump, and the combustion equipment.
  • the control unit has a single overboiling mode control and a circulating boiling mode control.
  • the one-boiling-up mode control is performed by controlling the circulation pump so that the first flow rate of water flows through the circulation flow path, heating the water with a heat exchanger, and discharging the hot water at the target hot water storage temperature.
  • Circulation boiling mode control is a temperature lower than the target hot water temperature by controlling the circulation pump so that a second flow rate of water larger than the first flow rate flows in the circulation flow path and heating the water with a heat exchanger.
  • the water in the tank is boiled by controlling so that the hot water temperature gradually increases toward the target hot water temperature.
  • a control part performs circulation boiling mode control in the 1st state, and operates a combustion apparatus when the temperature of the water supplied to a supply destination from a hot water supply part becomes smaller than a target value.
  • the first state is a state in which the amount of water having a predetermined temperature or higher (hereinafter referred to as high temperature water) stored in the tank is small or absent. Then, after the circulation boiling mode control, the control unit switches from the circulation boiling mode control to the one super-boiling mode control based on a change in the temperature of the water flowing through the circulation channel.
  • a one-over boiling mode control for circulating a first flow rate water, and a circulation boiling mode control for circulating a second flow rate water higher than the first flow rate Exists.
  • the circulation boiling mode control is executed. That is, in the first state where there is no or little heat in the water in the tank, first, circulation boiling mode control is performed in which water is heated by a heat pump while circulating a large amount of water.
  • the amount of water circulating is larger than that in the single overboiling mode control, the temperature of the heated water returning to the tank from the heat pump is lowered, but the heat pump is operated in an efficient region. Therefore, the amount of energy consumed by the operation of the heat pump is smaller than that in the case where the single over-boiling mode control is executed.
  • this hot water supply system in order to execute the circulating boiling mode control in which the temperature of the heated water returning from the heat pump to the tank is lowered, the first state where there is no or little amount of high-temperature water stored in the tank The problem is not solved easily, and high-temperature water does not easily accumulate at the top of the tank. Then, since it becomes impossible to supply water at the temperature requested by the supply destination, in this hot water supply system, the temperature of the water supplied from the hot water supply section to the supply destination is controlled while performing the circulation boiling mode control in the first state. Activate combustion equipment when less than value. Thereby, the water heated with the heat exchanger of the heat pump is heated directly or indirectly.
  • this hot water supply system suppresses the amount of energy consumed by the heat pump necessary for boiling water in the tank, lowers the running cost, and at the temperature required by the supplier (water ) Can be supplied.
  • a hot water supply system is the hot water supply system according to the first aspect, wherein the control unit executes the circulating boiling mode control before passing through the heat exchanger in the first state. On the basis of the change in the temperature of the water, the control mode is switched from the circulation boiling mode control to the single super boiling mode control.
  • the change in the temperature of the water before passing through the heat exchanger is monitored, and based on the change, the mode is switched from the cyclic boiling mode control to the single super-boiling mode control. Easy to avoid.
  • a hot water supply system is the hot water supply system according to the first aspect, and further includes a plurality of second temperature sensors.
  • the second temperature sensor is provided to detect the temperature distribution of water in the tank. Then, the control unit executes the circulation boiling mode control in the first state, and switches from the circulation boiling mode control to the one-over boiling control based on the temperature distribution of the water in the tank.
  • the control is switched from the circulating boiling mode control to the single super boiling mode control based on the temperature distribution of the water in the tank.
  • the hot water supply system supplies heated water to a supply destination.
  • the hot water supply system includes a hot water supply unit connected to a supply destination, a heat pump, a tank, a circulation channel, a combustion heating unit, and a control unit.
  • the heat pump includes a heat exchanger that exchanges heat between the refrigerant and water, and a compressor that compresses the refrigerant.
  • the tank stores water heated by the heat exchanger.
  • the circulation channel has a circulation pump with variable output, and circulates water between the tank and the heat exchanger.
  • the combustion heating unit has combustion equipment. A combustion device burns fuel and heats water.
  • the control unit controls the heat pump, the circulation pump, and the combustion equipment.
  • the control unit has a single overboiling mode control and a circulating boiling mode control.
  • the circulation pump is controlled so that the first flow rate of water flows in the circulation flow path, and the water in the tank is heated by heating the water with a heat exchanger.
  • the circulation boiling mode control the water in the tank is boiled by controlling the circulation pump so that the second flow rate of water, which is larger than the first flow rate, flows into the circulation flow path and heating the water with the heat exchanger. increase.
  • a control part performs circulation boiling mode control in the 1st state, and operates a combustion apparatus when the temperature of the water supplied to a supply destination from a hot water supply part becomes smaller than a target value.
  • the first state is a state in which the amount of water (high temperature water) stored in the tank at a predetermined temperature or higher (high temperature water) is small or absent.
  • circulation boiling mode control is performed in which water is heated with a heat pump while circulating a large amount of water. Then, since the amount of water circulating is larger than that in the single overboiling mode control, the temperature of the heated water returning to the tank from the heat pump is lowered, but the heat pump is operated in an efficient region. Therefore, the amount of energy consumed by the operation of the heat pump is smaller than that in the case where the single over-boiling mode control is executed.
  • this hot water supply system in order to execute the circulating boiling mode control in which the temperature of the heated water returning from the heat pump to the tank is lowered, the first state where there is no or little amount of high-temperature water stored in the tank The problem is not solved easily, and high-temperature water does not easily accumulate at the top of the tank. Then, since it becomes impossible to supply water at the temperature requested by the supply destination, in this hot water supply system, the temperature of the water supplied from the hot water supply section to the supply destination is controlled while performing the circulation boiling mode control in the first state. Activate combustion equipment when less than value. Thereby, the water heated with the heat exchanger of the heat pump is heated directly or indirectly.
  • this hot water supply system suppresses the amount of energy consumed by the heat pump necessary for boiling water in the tank, lowers the running cost, and at the temperature required by the supplier (water ) Can be supplied.
  • the hot water supply system according to the fifth aspect of the present invention is the hot water supply system according to the fourth aspect, and the control unit controls the output of the circulation pump within the first range in the single over-boiling mode control.
  • the control unit controls the output of the circulation pump within the second range in the circulation boiling mode control.
  • the intermediate value of the second range is larger than the intermediate value of the first range.
  • the circulating pump is controlled in the second range near the maximum output in the circulating boiling mode control, and is controlled in a wide range from a low output to a high output in the single over-boiling mode control. Thereby, the amount of water circulation in the circulation boiling mode control can be surely increased.
  • a hot water supply system is the hot water supply system according to the fourth aspect, further comprising a third temperature sensor.
  • the third temperature sensor detects the temperature of water after passing through the heat exchanger of the heat pump.
  • the control unit controls the circulation pump so that the temperature of the water after passing through the heat exchanger becomes the first target temperature value in the single over-boiling mode control. Further, the control unit controls the circulation pump so that the temperature of the water after passing through the heat exchanger becomes the second target temperature value in the circulation boiling mode control.
  • the second target temperature value is smaller than the first target temperature value.
  • the second target temperature value is set to be smaller than the first target temperature value so that the output of the circulation pump is larger in the circulation boiling mode control than in the one-over boiling mode control. Thereby, the amount of energy consumption of the heat pump necessary for boiling water in the tank is reliably suppressed.
  • the hot water supply system is the hot water supply system according to the fourth aspect, further comprising a third temperature sensor.
  • the third temperature sensor detects the temperature of water after passing through the heat exchanger of the heat pump.
  • the control unit controls the circulation pump so that the temperature of the water after passing through the heat exchanger becomes the first target temperature value in the single over-boiling mode control. Further, the control unit fixes the output of the circulation pump in the circulation boiling mode control.
  • the water in the tank is boiled with emphasis on the temperature of the heated water returning to the tank, and in the circulating boiling mode control, the amount of circulating water is reliably ensured. Therefore, the output of the circulation pump is fixed. Thereby, the amount of energy consumption of the heat pump necessary for boiling water in the tank is reliably suppressed.
  • a hot water supply system is the hot water supply system according to any of the fourth aspect to the seventh aspect, and further includes one or a plurality of first temperature sensors.
  • the first temperature sensor detects the temperature of water flowing through the circulation channel.
  • the control unit executes the circulation boiling mode control in the first state, and switches from the circulation boiling mode control to the single over-boiling mode control based on the temperature of the water flowing through the circulation channel.
  • the control is switched from the circulation boiling mode control to the single overheating mode control based on the temperature of the water flowing through the circulation channel.
  • a hot water supply system is the hot water supply system according to any of the fourth aspect to the eighth aspect, further comprising a plurality of second temperature sensors.
  • the second temperature sensor is a sensor for detecting the temperature distribution of water in the tank.
  • the control unit executes the circulating boiling mode control in the first state, and switches from the circulating boiling mode control to the single super boiling mode control based on the temperature distribution of the water in the tank.
  • a hot water supply system is the hot water supply system according to the eighth aspect, wherein the first temperature sensor passes through the inlet temperature, which is the temperature of water before passing through the heat exchanger, and the heat exchanger. And the outlet temperature, which is the temperature of the water after it has been detected.
  • the control unit executes the circulating boiling mode control in the first state, and switches from the circulating boiling mode control to the single over boiling mode control based on the inlet temperature and the outlet temperature.
  • the heat pump In the circulation boiling mode control with a large amount of circulating water, the heat pump can be operated in an efficient area, but since the circulation amount is large, the temperature of the water not only in the upper part of the tank but also in the lower part gradually increases. Come. Then, the temperature of the water before entering the heat exchanger of the heat pump increases, and the coefficient of performance (COP) of the heat pump decreases. Therefore, in the hot water supply system according to the seventh aspect, when the coefficient of performance (COP) of the heat pump is improved by switching to the single overboiling mode control over the circulation boiling mode control based on the inlet temperature and the outlet temperature, Switch from upper mode control to one-boiling upper mode control. As a result, the amount of energy consumed by the heat pump required for boiling water in the tank is further suppressed, and the running cost is reduced.
  • a hot-water supply system is the hot-water supply system according to any one of the fourth to tenth aspects, wherein the control unit executes the single over-boiling mode control when not in the first state. Alternatively, when not in the first state, the heat pump is stopped until the first state is reached.
  • the circulation boiling mode control is executed, and not in the first state, the amount of high-temperature water stored in the tank is large.
  • the overheating mode control is executed or the heat pump is stopped until the first state is reached.
  • the one-boiling-up mode control is executed, the amount of circulating water decreases, so that the phenomenon that hot water stored in the tank is mixed in the tank and moves from the upper part to the lower part is suppressed.
  • the heat pump is stopped until the first state is reached, the water in the tank is boiled by performing the circulating boiling mode control that allows the heat pump to operate in an efficient region after the first state. The amount of energy consumed by the heat pump required to increase the temperature is suppressed.
  • a hot water supply system is the hot water supply system according to any one of the fourth aspect to the eleventh aspect, wherein the compressor of the heat pump is variable in output.
  • the control unit controls the output of the compressor within the third range in the one-boiling upper mode control.
  • a control part controls the output of a compressor in the 4th range in circulation boiling mode control.
  • the fourth range is narrower than the third range.
  • the average value of the coefficient of performance (COP) of the heat pump when the compressor is operated in the fourth range is larger than the average value of the coefficient of performance (COP) of the heat pump when the compressor is operated in the third range. high.
  • the amount of energy consumed by the heat pump is controlled by controlling the compressor output within a narrow fourth range with a good coefficient of performance (COP) of the heat pump, so that it is stored in the tank.
  • COP coefficient of performance
  • water hot water is supplied at a temperature required by the supply destination while reducing the energy consumption of the heat pump necessary for boiling water in the tank and reducing the running cost. Can be supplied.
  • the hot water supply system According to the hot water supply system according to the second aspect of the present invention, it is easy to avoid operation of an inefficient heat pump.
  • the rate of decrease in the coefficient of performance (COP) of the heat pump is reduced or the coefficient of performance (COP) is improved.
  • FIG. 1 is an external view of a hot water supply system according to an embodiment of the present invention.
  • the water circuit and refrigerant circuit diagram of a hot-water supply system. The control block diagram of a hot-water supply system.
  • the external view of the remote control of a hot-water supply system The figure which shows the circulation of the water at the time of one over-boiling upper mode control.
  • the control flow figure of the boiling operation from the state in which the remaining hot water in a tank is 0 or 1.
  • FIG. 6 is a control flow diagram of a boiling operation when the remaining hot water in the tank is 2-5.
  • the water circuit of the hot-water supply system which concerns on the modification G, and a refrigerant circuit figure.
  • the hot water supply system 1 includes a heat pump 2, a hot water storage unit 3, a controller 50 for managing and controlling them, information display to the user, and acceptance of user operations.
  • a remote controller 90 for carrying the above.
  • the heat pump 2 is a unit that functions as a heat source device for heating water, and includes a refrigerant circuit 20 through which refrigerant circulates, a blower fan 24F, various sensors, and the like. I have. Various refrigerants can be used, but carbon dioxide is used here.
  • the refrigerant circuit 20 includes a compressor 21, a water heat exchanger 22, an electric expansion valve 23, an air heat exchanger 24, a refrigerant pipe 25, and the like.
  • the compressor 21 is an inverter-type variable output electric compressor.
  • the water heat exchanger 22 has a refrigerant pipe 22r and a water pipe 32w.
  • the water heat exchanger 22 is between the high-temperature and high-pressure gas refrigerant that flows through the refrigerant pipe 22r after being discharged by the compressor 21 of the heat pump 2, and the circulating water that flows from the hot water storage unit 3 to be described later and flows through the water pipe 32w. Let the heat exchange occur.
  • the refrigerant passing through the refrigerant pipe 22r is cooled, and at the same time, the water passing through the water pipe 32w is heated to generate hot water (hot water).
  • the electric expansion valve 23 exits the compressor 21 and expands the low-temperature and high-pressure refrigerant cooled by heat exchange with water.
  • the air heat exchanger 24 exchanges heat between the low-temperature and low-pressure two-phase refrigerant expanded by the electric expansion valve 23 and the outside air.
  • the refrigerant that has absorbed heat from the outside air evaporates to become a low-pressure gas refrigerant and is sucked into the compressor 21.
  • the refrigerant pipe 25 connects each device in the order of the discharge port of the compressor 21, the refrigerant pipe 22 r in the water heat exchanger 22, the electric expansion valve 23, the air heat exchanger 24, and the suction port of the compressor 21. .
  • FIG. 2 shows a heat exchanger inlet water temperature sensor 31T and a heat exchanger outlet water temperature sensor 32T among these sensors.
  • the heat exchanger inlet water temperature sensor 31T detects the temperature of water before entering the water heat exchanger 22. That is, the heat exchanger inlet water temperature sensor 31T detects the temperature of water before passing through the water heat exchanger 22.
  • the heat exchanger outlet water temperature sensor 32T detects the temperature of water after passing through the water heat exchanger 22.
  • the hot water storage unit 3 is a unit for storing water (hot water) returned from the heat pump 2 by heating the water supplied from the outside such as city water (tap water) to the heat pump 2 and heating it. is there.
  • the hot water storage unit 3 has a function of sending hot water whose temperature is adjusted by the combustion heating device 4 and the mixing valve 77 to the hot water supply unit 82 so that hot water having a temperature set by the user is supplied.
  • the hot water storage unit 3 includes a water intake part 81, a hot water supply part 82, a hot water storage tank 35, a circulating water pipe 30, a intake water hot water supply pipe 70, a combustion heating device 4, and the like.
  • the water intake section 81 has a connection port to which a supply pipe 89a for city water (tap water) is connected.
  • the hot water supply unit 82 has a connection port, and is connected to a water supply / hot water supply piping 99a extending from a faucet 99 or the like in the installation target building.
  • the hot water storage tank 35 is a tank in which water (hot water) heated by the heat pump 2 is stored in advance before the user turns the faucet 99 for use.
  • the hot water storage tank 35 is always filled with water.
  • the hot water storage tank 35 is provided with a tank temperature distribution detection sensor for causing the controller 50 to grasp the amount of high-temperature water (hereinafter, referred to as high-temperature water) that is equal to or higher than a predetermined temperature, here 70 ° C. or higher.
  • the tank temperature distribution detection sensor includes a first sensor T1, a second sensor T2, a third sensor T3, a fourth sensor T4, a fifth sensor T5, and a sixth sensor T6 in order from the lower part to the upper part of the hot water storage tank 35.
  • the controller 50 drives the heat pump 2 to perform a boiling operation based on the water temperature at each height position in the hot water storage tank 35 detected by the tank temperature distribution detection sensors T1 to T6 and the setting by the remote controller 90.
  • the boiling operation is an operation in which the amount of water is increased until the temperature of the water in the hot water storage tank 35 reaches a target temperature.
  • the target temperature in the boiling operation that is, the target hot water storage temperature of the hot water storage tank 35 is set in advance in the manufacturing plant of the hot water supply system 1, for example. In the present embodiment, the target hot water storage temperature is 75 ° C.
  • the remaining hot water amount is 0, and if the temperature detection value of the sixth sensor T6 is 70 ° C. or more, the remaining hot water amount is 1. Furthermore, if the temperature detection value of the fifth sensor T5 is also 70 ° C. or higher, the remaining hot water amount is 2. Similarly, the remaining hot water amount exists up to 3, 4, 5 and 6, and if the temperature detection value of the first sensor T1 is 70 ° C. or more, the remaining hot water amount is 6, which is the maximum.
  • the circulating water piping 30 is a circuit for transferring heat obtained by the heat pump 2 to the water in the hot water storage tank 35.
  • the circulating water piping 30 is a water pipe in the forward heat pipe 31 and the water heat exchanger 22. 32w, a return pipe 33, and a circulation pump 34 are provided.
  • the forward pipe 31 connects the vicinity of the lower end of the hot water storage tank 35 and the upstream end of the water pipe 32 w in the water heat exchanger 22.
  • the return pipe 33 connects the downstream end of the water pipe 32 w in the water heat exchanger 22 and the vicinity of the upper end of the hot water storage tank 35.
  • the circulation pump 34 is provided in the middle of the forward pipe 31.
  • the circulation pump 34 is an electric pump capable of adjusting the output, and plays a role of circulating water between the hot water storage tank 35 and the water heat exchanger 22. Specifically, in the circulating water pipe 30, the circulating pump 34 is driven in response to a command from the controller 50, so that the low-temperature water existing in the lower part of the water in the hot water storage tank 35 travels. The temperature rises by flowing out to the pipe 31 and passing through the water pipe 32 w in the water heat exchanger 22, and returns to the vicinity of the upper end of the hot water storage tank 35 through the return pipe 33. As a result, the boundary between the hot water in the hot water storage tank 35 and the water having a lower temperature moves from top to bottom, and the amount of high temperature water in the hot water storage tank 35 increases.
  • the water intake hot water supply pipe 70 is a circuit for using the high-temperature water stored in the hot water storage tank 35 while receiving supply of water from outside city water or the like.
  • a water intake pipe 71, a hot water supply pipe 73, a bypass pipe 74, and a mixing valve 77 are provided.
  • the intake pipe 71 is supplied with water from outside city water or the like, and supplies room temperature water near the lower end of the hot water storage tank 35.
  • the intake pipe 71 is provided with an intake temperature sensor 71T for detecting the temperature of water supplied by city water.
  • the hot water supply pipe 73 is a hot water existing in the vicinity of the upper end of the water stored in the hot water storage tank 35, and is supplied from the hot water supply part 82 to a user's use location, for example, a faucet 99 in the building. Lead to pipe 99a.
  • the combustion heating device 4 is provided in the middle of the hot water supply pipe 73.
  • the combustion heating device 4 is disposed between the hot water storage tank 35 and the mixing valve 77 and includes a combustion burner 41 that burns fuel gas.
  • the combustion burner 41 is a gas burner whose heating capacity can be adjusted, and heats the water flowing through the hot water supply pipe 73 while adjusting the heating amount in accordance with a command from the controller 50.
  • a pre-mixing hot water temperature sensor 4T for detecting the temperature of the passing water is provided.
  • the bypass pipe 74 is a pipe for mixing normal temperature water flowing through the intake pipe 71 and water (hot water) flowing through the hot water supply pipe 73.
  • the bypass pipe 74 extends from the water intake pipe 71 to the hot water supply pipe 73, and is connected to the hot water supply pipe 73 by a mixing valve 77.
  • the mixing valve 77 receives an instruction from the controller 50 and adjusts the mixing ratio of high temperature water (hot water) flowing through the hot water supply pipe 73 and normal temperature water flowing through the bypass pipe 74. It is.
  • the controller 50 is installed in the hot water storage unit 3 as shown in FIG. 3, and includes a compressor 21, an electric expansion valve 23, a blower fan 24F, a mixing valve 77, a combustion burner 41, It is connected to actuators such as a circulation pump 34 and sends operation instructions to these actuators.
  • the controller 50 is connected to sensors such as a heat exchanger inlet water temperature sensor 31T, a heat exchanger outlet water temperature sensor 32T, tank temperature distribution detection sensors T1 to T6, a water intake temperature sensor 71T, and a pre-mixing hot water temperature sensor 4T. The detection results are obtained from these sensors. Further, the controller 50 is connected to a remote controller 90 for accepting user setting input and providing information to the user.
  • the remote controller 90 includes a hot water temperature setting unit 91 for setting a necessary hot water (water) temperature, a display unit 92 for displaying a set hot water temperature, a remaining hot water amount, and the like. Is provided.
  • the temperature detection values from the first sensor T1 to the sixth sensor T6 are all below 70 ° C. 0.
  • the water after passing through the heat exchanger 22 of the heat pump 2 is used.
  • One over-boiling upper mode control 51 for controlling the heat pump 2 and the circulation pump 34 is performed so that the temperature becomes a target value. If the amount of water flowing through the circulating water pipe 30 is reduced and the one-boiling-up mode control 51 is performed so that high-temperature water returns to the hot water storage tank 35, as shown in FIG. Hot water accumulates.
  • the controller 50 of the hot water supply system 1 provides a boiling operation from a state in which the remaining hot water amount is 0.
  • the circulation boiling mode control 52 is selected instead of the super boiling mode control 51. This is not based on the idea of quickly storing high-temperature water in the upper part of the hot water storage tank 35 so that the amount of remaining hot water becomes 1 quickly, but based on the idea of boiling the water in the hot water storage tank 35 while keeping the power consumed by the heat pump 2 small. Is a choice.
  • the temperature of the water after passing through the heat exchanger 22 of the heat pump 2 needs to be increased from the beginning, and in the heat pump 2, the refrigerant flowing through the heat exchanger 22 is changed. It is necessary to increase the condensation temperature.
  • the coefficient of performance (COP) of the heat pump 2 is decreased.
  • the circulation boiling mode control 52 is executed at the start of the boiling operation, the amount of water circulation increases, and there is no need to increase the condensation temperature in the heat pump 2, and the coefficient of performance (COP) of the heat pump 2 is eliminated. Becomes higher.
  • the circulation pump 34 is controlled so that a small amount of water flows into the circulation water pipe 30, and the water is heated by the water heat exchanger 22 to set the target hot water storage temperature (here, 75 ° C.).
  • the water in the hot water storage tank 35 is boiled up by controlling so that the hot water is discharged. That is, here, the target heat exchanger outlet water temperature, which is the target value of the water leaving the water heat exchanger 22, is set to 75 ° C., which is the target hot water storage temperature.
  • the hot water temperature discharged from the heat pump 2 toward the hot water storage tank 35 becomes a temperature close to 75 ° C.
  • the circulation pump 34 is controlled so that more water flows to the circulation water pipe 30 than in the case of the single overboiling mode control 51, and the water heat exchanger 22 The hot water is discharged at a temperature lower than the target hot water storage temperature and controlled so that the hot water temperature gradually increases toward the target hot water temperature, thereby boiling the water in the hot water storage tank 35.
  • the main body of each step is the controller 50.
  • step S11 first, the compressor 21 of the heat pump 2 is started and the circulation pump 34 is started to rotate.
  • step S12 the circulation boiling mode control 52 is executed.
  • the output of the circulation pump 34 is fixed at the maximum output or an output close to the maximum output.
  • the output of the compressor 21 of the heat pump 2 is limited to a predetermined range where the coefficient of performance (COP) of the heat pump 2 is good.
  • the heat pump 2 is controlled in the range of 30% to 50% of the maximum frequency M (Hz) of the compressor 21.
  • the rotational speed of the compressor 21 is suppressed to a predetermined range, so the temperature of the water after passing through the heat exchanger 22 is relatively low.
  • the water in the hot water storage tank 35 mixes, and a big temperature difference does not arise in the upper part and the lower part of the hot water storage tank 35, As a whole, the water in the hot water storage tank 35 is boiling up.
  • step S13 it is determined whether or not the temperature of the water entering the water heat exchanger 22, that is, the detected temperature of the heat exchanger inlet water temperature sensor 31T exceeds a threshold value (25 ° C. here). If not, the circulation boiling mode control 52 in step S12 is continued.
  • step S13 if it is determined in step S13 that the temperature of the water entering the water heat exchanger 22 has exceeded the threshold value, the target heat exchanger outlet water temperature is read from a memory (not shown) in the controller 50 in step S14, and in step S15. Switching to the one-boiling-up mode control 51 is performed.
  • the output of the compressor 21 is limited (the above-mentioned maximum frequency M () so that the condensation temperature of the refrigerant in the water heat exchanger 22 of the heat pump 2 becomes the target heat exchanger outlet water temperature.
  • M the maximum frequency
  • the range of 30 to 50% of Hz is removed, and the rotational speed of the compressor 21 increases.
  • the output of the circulation pump 34 is reduced so that the temperature of the water after passing through the water heat exchanger 22 becomes the target heat exchanger outlet water temperature.
  • step S16 it is determined in step S16 whether or not the remaining hot water amount has reached a set value (for example, 5 or 6), and the overheating mode control 51 in step S15 is continued until it reaches. If it is determined in step S16 that the remaining hot water amount has reached the set value, the compressor 21 and the circulation pump 34 are stopped in step S17, and the boiling operation is terminated.
  • a set value for example, 5 or 6
  • the remaining hot water amount is 0 during the above-described boiling operation, particularly when the first circulating boiling mode control 52 is executed. For this reason, when the faucet 99 is opened and it is necessary to supply high-temperature hot water from the hot water supply unit 82, the controller 50 ignites the combustion burner 41 of the combustion heating device 4, and the water from the hot water storage tank 35 toward the hot water supply unit 82. To heat. At this time, the output of the combustion burner 41 is adjusted based on the detected temperature of the pre-mixing hot water temperature sensor 4T and the user's set hot water temperature input by the remote controller 90.
  • the controller 50 of the hot water supply system 1 circulates as a boiling operation from a state in which the remaining hot water amount is 2 to 5.
  • the one-over boiling mode control 51 is selected. This is because hot water already exists in the upper part of the hot water storage tank 35, and if a large amount of water is circulated through the circulating water pipe 30, the hot water in the upper part of the hot water storage tank 35 moves to the lower part. This is because water having a relatively high temperature enters the water heat exchanger 22 via the forward pipe 31. If the temperature of water entering the water heat exchanger 22 rises in this way, the refrigerant cannot be supercooled in the water heat exchanger 22 of the heat pump 2, and the coefficient of performance (COP) of the heat pump 2 decreases.
  • COP coefficient of performance
  • step S21 the compressor 21 of the heat pump 2 is first started and the circulation pump 34 is started to rotate.
  • step S22 the target heat exchanger outlet water temperature is read from the memory in the controller 50, and in step S23, the one-boiling-up mode control 51 is executed.
  • the output of the compressor 21 is adjusted so that the condensation temperature of the refrigerant in the water heat exchanger 22 of the heat pump 2 becomes a numerical value of the target heat exchanger outlet water temperature. Further, the output of the circulation pump 34 is adjusted so that the temperature of the water after passing through the water heat exchanger 22 becomes the target heat exchanger outlet water temperature. Both the output of the compressor 21 and the output of the circulation pump 34 are adjusted in the range from the minimum output to the maximum output.
  • step S24 it is determined whether or not the remaining hot water amount has reached a set value (for example, 5 or 6), and the one-boiling-up mode control 51 is continued until it reaches. If it is determined in step S24 that the remaining hot water amount has reached the set value, the compressor 21 and the circulation pump 34 are stopped in step S25, and the boiling operation is terminated.
  • a set value for example, 5 or 6
  • hot water supply system In the hot water supply system 1, as the control for boiling the water in the hot water storage tank 35, there is a single overboiling mode control 51 and a circulation boiling mode control 52.
  • the circulation boiling mode control 52 is first executed. Then, since the amount of water circulating through the circulating water pipe 30 is larger than that in the one-boiling mode control 51, the temperature of the heated water returning from the heat pump 2 to the hot water storage tank 35 is lowered. 2 can be operated in an efficient region, and the electric power consumed by the operation of the heat pump 2 is smaller than that in the case where the one-boiling upper mode control 51 is executed.
  • the circulation boiling mode control 52 is first executed in which the temperature of the heated water returning from the heat pump 2 to the hot water storage tank 35 is lowered.
  • a state where there is no or little amount, that is, a state where the remaining hot water amount is 0 or 1 is not easily solved, and high temperature water is not easily stored in the upper part of the hot water storage tank 35.
  • the temperature of the water to be supplied from the hot water supply unit 82 in the hot water supply system 1 while performing the circulation boiling mode control 52 that is, mixing
  • the combustion burner 41 of the combustion heating device 4 is ignited to heat the water from the hot water storage tank 35 toward the hot water supply section 82.
  • this hot water supply system 1 Since such a configuration is adopted, in this hot water supply system 1, the set hot water temperature requested by the user is reduced while suppressing the power consumption of the heat pump 2 required for boiling the water in the hot water storage tank 35 to reduce the running cost. We can supply hot water at.
  • switching from the circulating boiling mode control 52 to the single overheating mode control 51 is performed based on the temperature of the water flowing through the circulating water pipe 30 (the temperature detected by the heat exchanger inlet water temperature sensor 31T). Is going.
  • the amount of circulating water is reduced, the difference between the temperature of the water before entering the water heat exchanger 22 and the temperature of the water after passing through the water heat exchanger 22 is expanded, and the coefficient of performance of the heat pump 2 ( The decrease in COP) is suppressed.
  • the controller 50 adjusts the output of the compressor 21 in the range from the minimum output to the maximum output in the one-boiling upper mode control 51.
  • the controller 50 sets the output of the compressor 21 to a predetermined range in which the coefficient of performance (COP) of the heat pump 2 is good, that is, 30 of the maximum frequency M (Hz) of the compressor 21.
  • the adjustment is limited to the range of 50% to 50%.
  • control range may be limited so that the output of the circulation pump 34 does not become too large in the single over-boiling mode control.
  • the output of the circulation pump 34 is adjusted in a narrow range close to the maximum output, and in the one over-boiling mode control 51, the output for circulation is within a range not exceeding 50% of the maximum output.
  • the output of the pump 34 may be adjusted.
  • the output of the circulation pump 34 is controlled so that the temperature of the water after passing through the water heat exchanger 22 becomes the target heat exchanger outlet water temperature. It is possible to select.
  • the target heat exchanger outlet water temperature in the circulation boiling mode control is set to be lower than the target heat exchanger outlet water temperature in the one-boiling upper mode control 51. Even in such a control, the flow rate of the water flowing through the circulating water pipe 30 when the circulation boiling mode control is executed is increased, the power consumption of the heat pump 2 is suppressed, and the running related to the water boiling is performed. Cost is reduced.
  • switching from the circulating boiling mode control 52 to the one-over boiling mode control 51 may be performed based on the temperature distribution of water in the hot water storage tank 35. Also in this case, the power consumption of the heat pump 2 in the total boiling operation is suppressed.
  • the boiling operation from the state where the remaining hot water amount is 2 to 5 is prohibited and the remaining hot water amount becomes zero or the remaining hot water amount is reduced. It may wait until it becomes 1, and then control may be performed so that the boiling operation is started by the circulating boiling mode control 52. In this case, the power consumption of the heat pump 2 necessary for boiling the water in the hot water storage tank 35 is further suppressed.
  • the switching from the circulation boiling mode control 52 to the one super-boiling mode control 51 is performed by changing the temperature of water before passing through the water heat exchanger 22 and after passing through the water heat exchanger 22. You may carry out based on the temperature of water. That is, switching from the circulation boiling mode control 52 to the one-boiling mode control 51 may be performed based on the detected temperature of the heat exchanger inlet water temperature sensor 31T and the detected temperature of the heat exchanger outlet water temperature sensor 32T. Is possible.
  • the output of the circulation pump 34 may be slightly lowered from the maximum output, and the circulation boiling mode control 52 may be performed to the end. .
  • control is adjusted so that the ratio of the circulation boiling mode control 52 is relatively large in the boiling operation at night, and the ratio of the one-boiling mode control 51 is relatively large in the day-time boiling operation. Control may be adjusted.
  • the combustion heating device 104 of the hot water storage unit 103 heats the water returning from the water heat exchanger 22 to the hot water storage tank 35 when necessary.
  • the controller ignites the combustion burner 141 of the combustion heating device 104.
  • the water returning from the water heat exchanger 22 to the hot water storage tank 35 is heated by the combustion burner 141, and the temperature of the water from the hot water storage tank 35 toward the hot water supply section 82 is increased.
  • the output of the combustion burner 141 is adjusted based on the temperature detected by the pre-mixing hot water temperature sensor 4T and the user's set hot water temperature input by the remote controller 90.
  • the flow rate of water flowing through the circulating water pipe 30 when the circulation boiling mode control is executed is increased, the power consumption of the heat pump 2 is suppressed, and the running cost for boiling water is reduced. Go down.
  • the combustion heating device 204 of the hot water storage unit 203 is arranged alongside the hot water storage tank 35 between the intake pipe 71 and the hot water supply pipe 73. Further, the water from the combustion heating device 204 toward the hot water supply unit 82 and the water from the hot water storage tank 35 toward the hot water supply unit 82 both go to the hot water supply unit 82 through the mixing valve 177 provided in the hot water supply pipe 73.
  • the mixing valve 277 receives a command from the controller and adjusts the mixing ratio of the water flowing from the hot water storage tank 35 and the water flowing from the combustion heating device 204.
  • the combustion heating device 204 When the temperature of the temperature sensor 204T installed at the hot water tank 35 side of the mixing valve 277 is low when the faucet 99 is opened and high temperature hot water needs to be supplied from the hot water supply section 82, the combustion heating device 204 The combustion burner 241 is ignited. Then, the controller adjusts the combustion burner 241 and the mixing valve 277 so that the temperature of the water flowing from the hot water supply unit 82 to the in-building pipe 99a becomes the set hot water temperature set by the user.
  • Hot water supply system Heat pump 4 Combustion heating device (combustion heating unit) 21 Compressor 22 Water heat exchanger (Heat exchanger) 30 Circulating water piping (circulation flow path) 31T Heat exchanger inlet water temperature sensor (first temperature sensor) 32T heat exchanger outlet water temperature sensor (first temperature sensor) 34 Circulation pump 35 Hot water storage tank (tank) 41 Combustion burner (combustion equipment) 50 controller (control unit) 51 Over-boiling mode control 52 Circulating boiling mode control 82 Hot water supply section 99 Faucet (supplier) 104 Combustion heating device (combustion heating unit) 141 Combustion burner (combustion equipment) 204 Combustion heating device (combustion heating unit) 241 Combustion burner (combustion equipment) T1 to T6 Tank temperature distribution detection sensor (second temperature sensor)

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

L'invention a pour but de réduire les coûts de fonctionnement d'un système d'alimentation en eau chaude. À cet effet, le système d'alimentation en eau chaude (1) comprend une pompe à chaleur (2), un réservoir d'eau chaude (35), un tuyau de circulation d'eau (30), un dispositif de chauffage à combustion (4) et un dispositif de commande (50). Le dispositif de commande (50) comporte une commande de mode d'ébullition transitoire (51) et une commande de mode d'ébullition en circulation (52). Dans la commande de mode d'ébullition en circulation (52), une pompe de circulation (34) est commandée de sorte à faire couler une quantité supérieure d'eau à travers le tuyau de circulation d'eau (30) par rapport à la commande de mode d'ébullition transitoire (51), et l'eau contenue dans le réservoir d'eau chaude (35) est portée à ébullition. Le dispositif de commande (50) exécute d'abord la commande de mode d'ébullition en circulation (52) lorsque la quantité restante d'eau chaude est égale à 0 ou 1, et active le dispositif de chauffage à combustion (4) lorsque la température de l'eau à apporter à une destination est inférieure à une valeur cible. Ensuite, après la commande de mode d'ébullition en circulation (52), le dispositif de commande (50) commute de la commande de mode d'ébullition en circulation (52) à la commande de mode d'ébullition transitoire (51) sur la base d'un changement de la température de l'eau coulant à travers le tuyau de circulation d'eau (30).
PCT/JP2017/022849 2016-06-27 2017-06-21 Système d'alimentation en eau chaude WO2018003628A1 (fr)

Applications Claiming Priority (2)

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JP2016-126490 2016-06-27
JP2016126490A JP6743519B2 (ja) 2016-06-27 2016-06-27 給湯システム

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022180715A1 (fr) * 2021-02-25 2022-09-01 三浦工業株式会社 Système d'alimentation en chaleur

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001041574A (ja) * 1999-08-03 2001-02-16 Matsushita Electric Ind Co Ltd 給湯機
WO2012121382A1 (fr) * 2011-03-10 2012-09-13 ダイキン工業株式会社 Chauffe-eau du type pompe à chaleur
JP2013242115A (ja) * 2012-05-22 2013-12-05 Rinnai Corp 貯湯式給湯システム
JP2015048995A (ja) * 2013-09-02 2015-03-16 リンナイ株式会社 給湯システム
JP2016050731A (ja) * 2014-09-01 2016-04-11 リンナイ株式会社 ヒートポンプシステム
JP2016065685A (ja) * 2014-09-25 2016-04-28 三菱電機株式会社 ハイブリッド給湯システム
JP2016080204A (ja) * 2014-10-10 2016-05-16 三菱電機株式会社 給湯システム

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001041574A (ja) * 1999-08-03 2001-02-16 Matsushita Electric Ind Co Ltd 給湯機
WO2012121382A1 (fr) * 2011-03-10 2012-09-13 ダイキン工業株式会社 Chauffe-eau du type pompe à chaleur
JP2013242115A (ja) * 2012-05-22 2013-12-05 Rinnai Corp 貯湯式給湯システム
JP2015048995A (ja) * 2013-09-02 2015-03-16 リンナイ株式会社 給湯システム
JP2016050731A (ja) * 2014-09-01 2016-04-11 リンナイ株式会社 ヒートポンプシステム
JP2016065685A (ja) * 2014-09-25 2016-04-28 三菱電機株式会社 ハイブリッド給湯システム
JP2016080204A (ja) * 2014-10-10 2016-05-16 三菱電機株式会社 給湯システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022180715A1 (fr) * 2021-02-25 2022-09-01 三浦工業株式会社 Système d'alimentation en chaleur

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