WO2022230012A1 - 貯湯式ヒートポンプ給湯機 - Google Patents
貯湯式ヒートポンプ給湯機 Download PDFInfo
- Publication number
- WO2022230012A1 WO2022230012A1 PCT/JP2021/016613 JP2021016613W WO2022230012A1 WO 2022230012 A1 WO2022230012 A1 WO 2022230012A1 JP 2021016613 W JP2021016613 W JP 2021016613W WO 2022230012 A1 WO2022230012 A1 WO 2022230012A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hot water
- temperature
- heat
- water
- during
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 330
- 238000005338 heat storage Methods 0.000 claims abstract description 88
- 239000003507 refrigerant Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 15
- 230000007423 decrease Effects 0.000 description 10
- 230000002123 temporal effect Effects 0.000 description 10
- 238000013459 approach Methods 0.000 description 4
- 238000007562 laser obscuration time method Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- FXRLMCRCYDHQFW-UHFFFAOYSA-N 2,3,3,3-tetrafluoropropene Chemical compound FC(=C)C(F)(F)F FXRLMCRCYDHQFW-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
- F24D19/1054—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water the system uses a heat pump
-
- 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
- F24H4/04—Storage heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/02—Domestic hot-water supply systems using heat pumps
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/156—Reducing the quantity of energy consumed; Increasing efficiency
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/174—Supplying heated water with desired temperature or desired range of temperature
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/176—Improving or maintaining comfort of users
- F24H15/18—Preventing sudden or unintentional change of fluid temperature
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/219—Temperature of the water after heating
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/238—Flow rate
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/269—Time, e.g. hour or date
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/335—Control of pumps, e.g. on-off control
- F24H15/34—Control of the speed of pumps
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/375—Control of heat pumps
- F24H15/38—Control of compressors of heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/025—Motor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type heat pumps
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/144—Measuring or calculating energy consumption
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
- F25B2339/047—Water-cooled condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
Definitions
- the present disclosure relates to a hot water storage type heat pump water heater.
- Patent Document 1 in a hot water storage type heat pump water heater, after starting the heat pump device, the control device first operates either one or both of the heat pump device and the circulation pump so that the outlet hot water temperature becomes equal to the intermediate target temperature. Techniques for controlling are disclosed.
- the intermediate target temperature is a temperature lower than the target outlet heated water temperature.
- the control device continues operation for a predetermined period of time to equalize the outlet heated water temperature to the intermediate target temperature. After that, the control device controls one or both of the heat pump device and the circulation pump so that the outlet heated water temperature becomes equal to the target outlet heated water temperature.
- the present disclosure has been made to solve the problems described above, and aims to provide a hot water storage type heat pump water heater that is advantageous in increasing the amount of heat stored at relatively low temperatures.
- the hot water storage type heat pump water heater of the present disclosure includes a heat source device having a compressor that compresses a refrigerant and a water heat exchanger that exchanges heat between water and the refrigerant compressed by the compressor, and heating by the heat source device.
- a hot water storage tank for storing hot water
- a feed passage connecting the lower part of the hot water storage tank to the water inlet of the water heat exchanger
- a return passage connecting the water outlet of the water heat exchanger to the top of the hot water storage tank
- a feed passage or return A water circuit having a water pump provided in a passage, a temperature sensor for detecting the actual hot water temperature that is the temperature of hot water flowing out from the water heat exchanger, a compressor frequency that is the operating frequency of the compressor, and a water pump and a control circuit for controlling the rotation speed of the pump, which is the rotation speed of the pump.
- the rotational speed is adjusted, and the heat storage operation includes a first operation and a second operation after the first operation, wherein the compressor frequency during the first operation is higher than the compressor frequency during the second operation.
- the target outlet heated water temperature in the first operation is lower than the target outlet heated water temperature in the second operation.
- FIG. 1 is a diagram showing a hot water storage type heat pump water heater according to Embodiment 1.
- FIG. 5 is a diagram showing an example of temporal changes in outlet hot water temperature during heat storage operation.
- FIG. 3 is a diagram showing an example of temporal changes in COP in the case of FIG. 2;
- FIG. 4 is a diagram showing the relationship between input (W) and capacity (Q) during a winter hot water supply and heat retention mode efficiency test. It is a figure which summarized the influence when the low-temperature heat storage operation time is lengthened.
- 4 is a diagram showing an example of temporal changes in target hot water outlet temperature, compressor frequency, and heating capacity during heat storage operation of the hot water storage type heat pump water heater according to Embodiment 1.
- FIG. 10 is a diagram showing an example of temporal changes in target hot water outlet temperature, compressor frequency, and heating capacity during heat storage operation of the hot water storage type heat pump water heater according to Embodiment 2;
- FIG. 10 is a diagram showing an example of temporal changes in target hot water outlet temperature, compressor frequency, and heating capacity during heat storage operation of the hot water storage type heat pump water heater according to Embodiment 3;
- FIG. 1 is a diagram showing a hot water storage type heat pump water heater according to Embodiment 1.
- the hot water storage type heat pump water heater 1 according to Embodiment 1 includes a heat source device 2 and a tank unit 3 .
- the heat source machine 2 is arranged outdoors.
- the tank unit 3 may be arranged outdoors or may be arranged indoors.
- the heat source device 2 and the tank unit 3 are connected via a water pipe and an electric cable (not shown).
- a hot water storage tank 4 for storing hot water heated by the heat source device 2, a water pump 5, and a control device 6 are provided in the tank unit 3.
- the rotation speed of the water pump 5 is hereinafter referred to as "pump rotation speed”.
- the control device 6 can control the pump rotation speed.
- the controller 6 may be configured to vary the pump rotation speed, for example by inverter control.
- Controller 6 may comprise at least one processor and at least one memory.
- the heat source device 2 includes a refrigerant circuit in which a compressor 7 , a water heat exchanger 8 , an expansion valve 9 , and an air heat exchanger 10 are annularly connected via refrigerant pipes 12 .
- the heat source device 2 further includes a blower 11 that blows outdoor air to the air heat exchanger 10 and a control device 13 .
- the heat source device 2 uses a refrigerant circuit to operate a refrigeration cycle, that is, a heat pump cycle.
- the compressor 7 compresses refrigerant gas.
- the refrigerant may be, for example, carbon dioxide, ammonia, propane, isobutane, freon such as HFC, HFO-1123, or HFO-1234yf.
- the control device 13 controls the operation of the compressor 7.
- the operating speed of the compressor 7 is variable.
- the control device 13 can vary the operating speed of the compressor 7 by varying the operating frequency of the electric motor provided in the compressor 7 by inverter control.
- the operating speed of the compressor 7 increases as the operating frequency of the compressor 7 increases.
- the operating frequency of the compressor 7 will be referred to as "compressor frequency”.
- Controller 13 may comprise at least one processor and at least one memory.
- control device 6 and the control device 13 can communicate with each other.
- control device 6 and control device 13 cooperate to control the operation of hot water storage type heat pump water heater 1 .
- the control device 6 and the control device 13 correspond to control circuits. In the following description, either one or both of the control device 6 and the control device 13 may be called "control circuit". Note that the present disclosure is not limited to a configuration in which the control device 6 and the control device 13 cooperate to control the operation of the hot water storage type heat pump water heater 1, and a single control device controls the hot water storage type heat pump water heater. 1 may be configured to control the operation.
- the hot water storage tank 4 stores hot water heated by the heat source device 2 and low-temperature water before being heated by the heat source device 2.
- a temperature stratification is formed in which the upper side has a high temperature and the lower side has a low temperature due to the difference in water density caused by the temperature difference.
- the hot water storage tank 4 is covered with a heat insulating material (not shown) for preventing heat dissipation.
- the shape of the hot water storage tank 4 is not particularly limited, but may be, for example, a cylindrical shape whose axis is in the vertical direction.
- the water heat exchanger 8 has a refrigerant channel through which the refrigerant compressed by the compressor 7 flows, and a water channel through which the water from the hot water storage tank 4 flows.
- the water heat exchanger 8 heats water by exchanging heat between the refrigerant flowing through the refrigerant channel and the water flowing through the water channel.
- the expansion valve 9 expands the high-pressure refrigerant that has passed through the water heat exchanger 8 to reduce the pressure.
- the control device 13 may control the degree of opening of the expansion valve 9 .
- the expansion valve 9 may be a linear expansion valve whose opening can be continuously adjusted.
- the air heat exchanger 10 evaporates the low-pressure refrigerant by exchanging heat between the outdoor air and the low-pressure refrigerant that has passed through the expansion valve 9 .
- the low-pressure refrigerant gas that has passed through the air heat exchanger 10 flows into the compressor 7 .
- the lower part of the hot water storage tank 4 and the inlet of the water flow path of the water heat exchanger 8 are connected via the feed passage 14 .
- a return passage 15 connects between the outlet of the water flow path of the water heat exchanger 8 and the upper portion of the hot water storage tank 4 .
- a water pump 5 is provided in the feed passage 14 .
- the return passage 15 may be provided with the water pump 5 .
- the heat storage operation is an operation for accumulating heat in the hot water storage tank 4 by accumulating hot water in the hot water storage tank 4 .
- a water supply pipe 16 is connected to the lower part of the hot water storage tank 4 .
- a hot water supply pipe 17 for supplying hot water from the hot water storage tank 4 is connected to the upper portion of the hot water storage tank 4 .
- a water source such as tap water
- the hot water storage tank 4 is always full of water. maintained at During hot water supply, the water pressure from the water supply pipe 16 causes the hot water in the hot water storage tank 4 to flow out to the hot water supply pipe 17 .
- the same amount of low temperature water flows into the lower part of the hot water storage tank 4 from the water supply pipe 16 .
- the hot water storage type heat pump water heater 1 can perform heat storage operation. In the heat storage operation, water is circulated in the water circuit, and hot water heated by the water heat exchanger 8 is stored in the hot water storage tank 4 .
- the control circuit performs control as follows. The heat source machine 2 and the water pump 5 are operated. Water flowing out from the lower part of the hot water storage tank 4 is sent to the water heat exchanger 8 through the sending passage 14 . The hot water heated by the water heat exchanger 8 returns to the tank unit 3 through the return passage 15 and flows into the upper part of the hot water storage tank 4 .
- By performing such a heat storage operation hot water is gradually stored from the top to the bottom inside the hot water storage tank 4, and the temperature boundary layer between the hot water and the low-temperature water gradually moves downward. To go.
- the heat source device 2 includes an outlet heated water temperature sensor 18 that detects the outlet heated water temperature.
- the actual outlet heated water temperature detected by the outlet heated water temperature sensor 18 is referred to as "actual outlet heated water temperature”.
- the outlet hot water temperature sensor 18 is installed at the outlet of the water flow path of the water heat exchanger 8 or at the return passage 15 .
- the control circuit controls the pump rotation speed so that the actual discharged hot water temperature detected by the discharged hot water temperature sensor 18 becomes equal to the target discharged hot water temperature.
- water flow rate the flow rate of water flowing through the water circuit is simply referred to as "water flow rate".
- the control circuit lowers the pump rotation speed to lower the water flow rate.
- the actual outlet heated water temperature rises and approaches the target outlet heated water temperature.
- the control circuit increases the pump rotation speed to increase the water flow rate.
- the actual outlet heated water temperature decreases and approaches the target outlet heated water temperature.
- FIG. 2 is a diagram showing an example of temporal changes in outlet heated water temperature during heat storage operation.
- FIG. 3 is a diagram showing an example of temporal changes in COP in the case of FIG.
- the first stage in FIGS. 2 and 3 corresponds to a low-temperature heat storage operation in which hot water is stored in the hot water storage tank 4 at a relatively low hot water outlet temperature.
- the second stage in FIGS. 2 and 3 corresponds to a high-temperature heat storage operation in which hot water is stored in the hot water storage tank 4 at a relatively high outlet hot water temperature.
- the refrigerant pressure on the high pressure side of the refrigerant circuit during the low temperature heat storage operation is lower than the refrigerant pressure on the high pressure side of the refrigerant circuit during the high temperature heat storage operation.
- the COP of the low temperature heat storage operation is higher than the COP of the high temperature heat storage operation.
- the first stage control time (time from tp to tc) in FIGS. 2 and 3 is referred to as "low-temperature heat storage operation time".
- low-temperature heat storage operation time Under the JIS (Japanese Industrial Standards) winter hot water supply and heat retention mode efficiency operating conditions, the longer the low-temperature heat storage operation time, the more the winter hot water supply and heat retention mode efficiency is improved.
- the time period that includes the daytime is referred to as the "day time period”, and the time period other than the daytime time period is referred to as the "night time period”.
- the daytime hours may be, for example, the hours from 7:00 to 23:00. In that case, the time period from 23:00 to 7:00 of the next day corresponds to the night time period.
- the heat storage operation performed during the daytime is referred to as “daytime heat storage operation”.
- the heat storage operation performed in the night time zone is called “nighttime heat storage operation”.
- the amount of heat accumulated in the hot water storage tank 4 by the heat storage operation is referred to as "heat storage amount”.
- FIG. 4 is a diagram showing the relationship between the input (W) and the capacity (Q) during the winter hot water supply and heat retention mode efficiency test.
- FIG. 5 is a diagram summarizing the effects of lengthening the low-temperature heat storage operation time.
- the temperature of water flowing into the water heat exchanger 8 will be referred to as "incoming water temperature”, and the flow rate of water flowing into the water heat exchanger 8 will be referred to as “incoming water flow rate”.
- the amount of heat given to water by the heat source device 2 per hour is referred to as "heating capacity”.
- the unit of heating capacity is, for example, watts.
- the heating capacity corresponds to the amount of heat given to water by the refrigerant per hour in the water heat exchanger 8 .
- the COP may decrease due to the increase in the incoming water temperature.
- the COP at start-up is improved as the amount of stored heat at low temperatures is increased.
- the amount of heat stored during the daytime can be increased, the amount of heat stored during the nighttime is reduced.
- the loss of heat energy dissipated from the hot water storage tank 4 decreases. From the above, the longer the low-temperature heat storage operation time, the more the power consumption can be reduced.
- the heat storage operation may be stopped in order to perform heat retention operation using the heat source unit 2 while the heat storage operation is being performed.
- the heat retention operation using the heat source device 2 is, for example, to supply hot water from the heat source device 2 to a reheating heat exchanger (not shown) that heats the bath water circulating from the bathtub in order to keep the temperature of the bath water in the bathtub. It is a supply operation.
- the low-temperature heat storage operation may stop due to the heat retention operation using the heat source device 2 being performed while the low-temperature heat storage operation is being performed. In this way, there is a time period during which the low-temperature heat storage operation is stopped due to the heat retention operation, so the low-temperature heat storage operation time is limited. Therefore, there is a limit to the effect of reducing power consumption by extending the low-temperature heat storage operating time.
- FIG. 6 is a diagram showing an example of temporal changes in target hot water outlet temperature, compressor frequency, and heating capacity during heat storage operation of the hot water storage type heat pump water heater 1 according to Embodiment 1.
- the heat storage operation in the present disclosure includes a first operation and a second operation after the first operation.
- the control circuit first executes the first operation, and after the first operation ends, executes the second operation.
- the control circuit is configured to cause the compressor frequency during the first run to be higher than the compressor frequency during the second run. Further, the control circuit is configured to make the target outlet heated water temperature during the first operation lower than the target outlet heated water temperature during the second operation.
- the control circuit controls the pump rotation speed so that the actual discharged heated water temperature detected by the discharged heated water temperature sensor 18 becomes equal to the target discharged heated water temperature.
- the actual outlet heated water temperature in the first operation is a value in line with the target outlet heated water temperature in the first operation
- the actual outlet heated water temperature in the second operation is equal to the target outlet heated water temperature in the second operation. It will be a value along the
- the heating capacity during the first operation is higher than the heating capacity during the second operation.
- the amount of heat stored in the first operation is referred to as “low-temperature heat storage”
- the amount of heat stored in the second operation is referred to as "high-temperature heat storage”.
- the heating capacity during the first operation is higher than that during the second operation, so even if the time of the first operation is limited, it is possible to increase the low-temperature heat storage amount.
- the COP during the first run is higher than the COP during the second run. Therefore, as the low-temperature heat storage amount increases, the COP improves as a whole. Therefore, the present embodiment is advantageous in reducing the power consumption of the hot water storage type heat pump water heater 1 .
- the control circuit is configured to make the pump rotation speed during the first operation higher than the pump rotation speed during the second operation. This makes it possible to make the actual outlet heated water temperature during the first operation lower than the actual outlet heated water temperature during the second operation. If the pump rotation speed fluctuates, the control circuit should be configured so that the average pump rotation speed during the first operation is higher than the average pump rotation speed during the second operation. Just do it.
- the control circuit may be configured to execute the heat storage operation including the first operation and the second operation in the daytime heat storage operation performed during the daytime hours. As a result, it is possible to increase the amount of stored heat during the daytime hours and decrease the amount of stored heat during the nighttime hours, which is more advantageous for reducing the daily power consumption.
- the control circuit may be configured to omit the first operation and perform the second operation during the nighttime heat storage operation that is performed during the nighttime hours.
- the temperature boundary layer in the hot water storage tank 4 may reach the lower part of the hot water storage tank 4 and the incoming water temperature may rise. The longer the time of the first operation, the easier it is for the incoming water temperature to rise immediately before the end of the nighttime heat storage operation.
- control circuit is configured to keep the target outlet heated water temperature constant from the start of the first operation to the end of the first operation.
- the actual outlet hot water temperature can be further stabilized from the start of the first operation to the end of the first operation, further improving the COP.
- control circuit is configured to keep the compressor frequency constant from the start of the first operation to the end of the first operation.
- the heating capacity is stabilized from the start of the first operation to the end of the first operation, so the actual discharged hot water temperature can be further stabilized, and the COP is further improved.
- the control circuit detects the hot water supply load using a hot water supply flow rate sensor (not shown) that detects the flow rate of hot water passing through the hot water supply pipe 17 and a hot water supply temperature sensor (not shown) that detects the temperature of hot water passing through the hot water supply pipe 17. and the daily hot water supply load may be learned.
- the control circuit may determine the target heat storage amount by statistically processing the hot water supply load for the past multiple days (for example, the past 14 days). When the target heat storage heat amount is large, the volume of hot water to be stored in the hot water storage tank 4 increases, so the temperature boundary layer approaches the lower part of the hot water storage tank 4 before the end of the heat storage operation, the incoming water temperature rises, and the COP increases. may decline.
- the control circuit adjusts the ratio of the low-temperature heat storage amount to the high-temperature heat storage amount according to the target heat storage amount. You can change it. For example, when the target heat storage amount is relatively large, the control circuit makes the ratio of the low-temperature heat storage amount to the high-temperature heat storage amount relatively small, and when the target heat storage amount is relatively small, the ratio of the low-temperature heat storage amount to the high-temperature heat storage amount. can be relatively large. As a result, even when the target heat storage amount is large, it is possible to prevent the incoming water temperature from rising before the end of the heat storage operation, and to more reliably avoid a decrease in the COP.
- the ratio of the low-temperature heat storage amount to the high-temperature heat storage amount is increased to increase the COP as a whole. Further improve.
- FIG. 7 is a diagram showing an example of temporal changes in the target hot water outlet temperature, the compressor frequency, and the heating capacity during the heat storage operation of the hot water storage type heat pump water heater 1 according to Embodiment 2.
- FIG. 7 is a diagram showing an example of temporal changes in the target hot water outlet temperature, the compressor frequency, and the heating capacity during the heat storage operation of the hot water storage type heat pump water heater 1 according to Embodiment 2.
- the control circuit in Embodiment 2 is configured to increase the target hot water temperature in stages from the start of the first operation to the end of the first operation.
- the target outlet heated water temperature changes less than in the first embodiment when the first operation is changed to the second operation. Therefore, when transitioning from the first operation to the second operation, the actual outlet hot water temperature can be stabilized more than in the first embodiment, the loss at the time of transition is reduced, and the COP is further improved.
- the control circuit in Embodiment 2 is configured to gradually lower the compressor frequency from the start of the first operation to the end of the first operation. As a result, changes in the compressor frequency and changes in the heating capacity when the first operation transitions to the second operation are smaller than in the first embodiment. Therefore, when transitioning from the first operation to the second operation, the actual outlet hot water temperature can be stabilized more than in the first embodiment, the loss at the time of transition is reduced, and the COP is further improved.
- control circuit is configured to raise the target outlet heated water temperature and simultaneously lower the compressor frequency in the first operation. That is, the control circuit is configured to lower the compressor frequency as the target outlet heated water temperature increases in the first operation.
- control circuit is configured to raise the target outlet hot water temperature in three stages in the first operation.
- control circuit may raise the target outlet heated water temperature in two steps, or raise the target outlet heated water temperature in four steps or more in the first operation.
- control circuit is configured to reduce the compressor frequency in three stages during the first run.
- control circuit may lower the compressor frequency in two steps, or may lower the compressor frequency in multiple steps of four or more steps in the first operation.
- FIG. 8 is a diagram showing an example of temporal changes in the target hot water outlet temperature, the compressor frequency, and the heating capacity during the heat storage operation of the hot water storage type heat pump water heater 1 according to Embodiment 3.
- FIG. 8 is a diagram showing an example of temporal changes in the target hot water outlet temperature, the compressor frequency, and the heating capacity during the heat storage operation of the hot water storage type heat pump water heater 1 according to Embodiment 3.
- the control circuit in Embodiment 3 is configured to continuously raise the target hot water temperature from the start of the first operation to the end of the first operation. That is, the control circuit in Embodiment 3 is configured to change the target outlet heated water temperature in a slope from the start of the first operation to the end of the first operation.
- the loss at the time of transition from the first operation to the second operation is further reduced than in the second embodiment, and the COP is further improved.
- control circuit is configured to make the target outlet heated water temperature at the end of the first operation equal to the target outlet heated water temperature during the second operation.
- the control circuit in Embodiment 3 is configured to continuously lower the compressor frequency from the start of the first operation to the end of the first operation. That is, the control circuit in Embodiment 3 is configured to change the compressor frequency in a slope form from the start of the first operation to the end of the first operation. In the present embodiment, the loss at the time of transition from the first operation to the second operation is further reduced than in the second embodiment, and the COP is further improved.
- control circuit is configured to equalize the compressor frequency at the end of the first run to the compressor frequency during the second run.
- Embodiment 4 Next, the fourth embodiment will be described, focusing on differences from the above-described embodiments, and common descriptions will be simplified or omitted. Moreover, the same code
- the fourth embodiment can be implemented in combination with any one of the first to third embodiments described above.
- the control circuit is configured to make the rotational speed of the fan 11 during the first operation higher than the rotational speed of the fan 11 during the second operation.
- the operating speed of the compressor 7 during the first operation is higher than the operating speed of the compressor 7 during the second operation, so the refrigerant pressure on the low pressure side of the refrigerant circuit during the first operation is can be lower than the refrigerant pressure on the low pressure side of the refrigerant circuit during the second operation. Therefore, depending on the temperature and humidity conditions of the outside air, frost may form on the air heat exchanger 10 during the first operation.
- the rotation speed of the blower 11 during the first operation is set higher than the rotation speed of the blower 11 during the second operation. The formation of frost on the heat exchanger 10 can be reliably suppressed.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid Mechanics (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
図1は、実施の形態1による貯湯式ヒートポンプ給湯機を示す図である。図1に示すように、実施の形態1による貯湯式ヒートポンプ給湯機1は、熱源機2と、タンクユニット3とを備えている。熱源機2は、室外に配置される。タンクユニット3は、室外に配置されてもよいし、室内に配置されてもよい。熱源機2とタンクユニット3との間は、水配管と、電気ケーブル(図示省略)とを介して接続されている。
次に、図7を参照して、実施の形態2について説明するが、前述した実施の形態1との相違点を中心に説明し、共通する説明を簡略化または省略する。また、前述した要素と共通または対応する要素には、同一の符号を付す。図7は、実施の形態2による貯湯式ヒートポンプ給湯機1の蓄熱運転のときの、目標出湯温度、圧縮機周波数、及び、加熱能力の、時間的な変化の例を示す図である。
次に、図8を参照して、実施の形態3について説明するが、前述した実施の形態1との相違点を中心に説明し、共通する説明を簡略化または省略する。また、前述した要素と共通または対応する要素には、同一の符号を付す。図8は、実施の形態3による貯湯式ヒートポンプ給湯機1の蓄熱運転のときの、目標出湯温度、圧縮機周波数、及び、加熱能力の、時間的な変化の例を示す図である。
次に、実施の形態4について説明するが、前述した実施の形態との相違点を中心に説明し、共通する説明を簡略化または省略する。また、前述した要素と共通または対応する要素には、同一の符号を付す。
Claims (10)
- 冷媒を圧縮する圧縮機と、水と前記圧縮機により圧縮された冷媒との間で熱を交換する水熱交換器とを有する熱源機と、
前記熱源機により加熱された湯を貯留する貯湯タンクと、
前記貯湯タンクの下部を前記水熱交換器の水入口につなぐ送り通路と、前記水熱交換器の水出口を前記貯湯タンクの上部につなぐ戻り通路と、前記送り通路または前記戻り通路に設けられた送水ポンプとを有する水回路と、
前記水熱交換器から流出する湯の温度である実出湯温度を検出する温度センサと、
前記圧縮機の運転周波数である圧縮機周波数と、前記送水ポンプの回転速度であるポンプ回転速度とを制御する制御回路と、
を備え、
前記貯湯タンクに湯を蓄積する蓄熱運転のときに、前記制御回路は、前記実出湯温度が目標出湯温度に等しくなるように、前記ポンプ回転速度を調整し、
前記蓄熱運転は、第一運転と、前記第一運転よりも後の第二運転とを含み、
前記第一運転のときの前記圧縮機周波数は、前記第二運転のときの前記圧縮機周波数よりも高く、
前記第一運転のときの前記目標出湯温度は、前記第二運転のときの前記目標出湯温度よりも低い貯湯式ヒートポンプ給湯機。 - 前記第一運転のときの前記ポンプ回転速度は、前記第二運転のときの前記ポンプ回転速度よりも高い請求項1に記載の貯湯式ヒートポンプ給湯機。
- 前記第一運転の開始から前記第一運転の終了までの間に前記目標出湯温度を一定に維持する請求項1または請求項2に記載の貯湯式ヒートポンプ給湯機。
- 前記第一運転の開始から前記第一運転の終了までの間に前記目標出湯温度を段階的に上げる請求項1または請求項2に記載の貯湯式ヒートポンプ給湯機。
- 前記第一運転の開始から前記第一運転の終了までの間に前記目標出湯温度を連続的に上げる請求項1または請求項2に記載の貯湯式ヒートポンプ給湯機。
- 前記第一運転の開始から前記第一運転の終了までの間に前記圧縮機周波数を一定に維持する請求項1から請求項5のいずれか一項に記載の貯湯式ヒートポンプ給湯機。
- 前記第一運転の開始から前記第一運転の終了までの間に前記圧縮機周波数を段階的に下げる請求項1から請求項5のいずれか一項に記載の貯湯式ヒートポンプ給湯機。
- 前記第一運転の開始から前記第一運転の終了までの間に前記圧縮機周波数を連続的に下げる請求項1から請求項5のいずれか一項に記載の貯湯式ヒートポンプ給湯機。
- 前記熱源機は、室外の空気と前記冷媒との間で熱を交換する空気熱交換器と、前記空気熱交換器へ送風する送風機とをさらに有し、
前記制御回路は、前記第一運転のときの前記送風機の回転速度を前記第二運転のときの前記送風機の回転速度よりも高くする請求項1から請求項8のいずれか一項に記載の貯湯式ヒートポンプ給湯機。 - 前記第一運転と前記第二運転とを含む前記蓄熱運転は、一日のうちで昼間を含む時間帯である昼間時間帯に実施される昼間蓄熱運転であり、
一日のうちで前記昼間時間帯以外の時間帯である夜間時間帯に実施される夜間蓄熱運転のときには、前記制御回路は、前記第一運転を省略して前記第二運転を実行する請求項1から請求項9のいずれか一項に記載の貯湯式ヒートポンプ給湯機。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21939175.2A EP4332456A4 (en) | 2021-04-26 | 2021-04-26 | HEAT PUMP WATER HEATER WITH HOT WATER TANK |
PCT/JP2021/016613 WO2022230012A1 (ja) | 2021-04-26 | 2021-04-26 | 貯湯式ヒートポンプ給湯機 |
JP2023516868A JP7464192B2 (ja) | 2021-04-26 | 2021-04-26 | 貯湯式ヒートポンプ給湯機 |
US18/546,117 US20240230157A9 (en) | 2021-04-26 | Storage type heat pump hot water supplying apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2021/016613 WO2022230012A1 (ja) | 2021-04-26 | 2021-04-26 | 貯湯式ヒートポンプ給湯機 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022230012A1 true WO2022230012A1 (ja) | 2022-11-03 |
Family
ID=83846780
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/016613 WO2022230012A1 (ja) | 2021-04-26 | 2021-04-26 | 貯湯式ヒートポンプ給湯機 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4332456A4 (ja) |
JP (1) | JP7464192B2 (ja) |
WO (1) | WO2022230012A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002340402A (ja) * | 2001-05-18 | 2002-11-27 | Matsushita Electric Ind Co Ltd | ヒートポンプ給湯機 |
WO2015198424A1 (ja) * | 2014-06-25 | 2015-12-30 | 三菱電機株式会社 | ヒートポンプ装置 |
WO2016181501A1 (ja) * | 2015-05-12 | 2016-11-17 | 三菱電機株式会社 | ヒートポンプ式設備装置 |
JP2017072265A (ja) * | 2015-10-05 | 2017-04-13 | パナソニックIpマネジメント株式会社 | ヒートポンプ給湯装置 |
JP2017207234A (ja) * | 2016-05-17 | 2017-11-24 | 三菱電機株式会社 | ヒートポンプ式給湯システム |
JP2018091517A (ja) * | 2016-11-30 | 2018-06-14 | ダイキン工業株式会社 | 給湯装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7151442B2 (ja) | 2018-12-07 | 2022-10-12 | 三菱電機株式会社 | ヒートポンプ給湯機 |
-
2021
- 2021-04-26 JP JP2023516868A patent/JP7464192B2/ja active Active
- 2021-04-26 EP EP21939175.2A patent/EP4332456A4/en active Pending
- 2021-04-26 WO PCT/JP2021/016613 patent/WO2022230012A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002340402A (ja) * | 2001-05-18 | 2002-11-27 | Matsushita Electric Ind Co Ltd | ヒートポンプ給湯機 |
WO2015198424A1 (ja) * | 2014-06-25 | 2015-12-30 | 三菱電機株式会社 | ヒートポンプ装置 |
WO2016181501A1 (ja) * | 2015-05-12 | 2016-11-17 | 三菱電機株式会社 | ヒートポンプ式設備装置 |
JP2017072265A (ja) * | 2015-10-05 | 2017-04-13 | パナソニックIpマネジメント株式会社 | ヒートポンプ給湯装置 |
JP2017207234A (ja) * | 2016-05-17 | 2017-11-24 | 三菱電機株式会社 | ヒートポンプ式給湯システム |
JP2018091517A (ja) * | 2016-11-30 | 2018-06-14 | ダイキン工業株式会社 | 給湯装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP4332456A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP7464192B2 (ja) | 2024-04-09 |
EP4332456A4 (en) | 2024-06-12 |
EP4332456A1 (en) | 2024-03-06 |
US20240133588A1 (en) | 2024-04-25 |
JPWO2022230012A1 (ja) | 2022-11-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN104949409B (zh) | 一种无需启动压缩机的柔性空气源热泵除霜系统及方法 | |
JP7140276B2 (ja) | 蓄熱システム | |
JP2007218463A (ja) | ヒートポンプ給湯冷暖房装置 | |
JP2014194315A (ja) | 給水加温システム | |
EP3106773B1 (en) | Heat pump hot water supply device | |
JP5481838B2 (ja) | ヒートポンプサイクル装置 | |
JP2006300473A (ja) | 給湯装置 | |
JP2009264718A (ja) | ヒートポンプ温水システム | |
JP2012013350A (ja) | 温水暖房装置 | |
JP2008082601A (ja) | ヒートポンプ給湯装置 | |
WO2022230012A1 (ja) | 貯湯式ヒートポンプ給湯機 | |
JP2004340535A (ja) | ヒートポンプ給湯装置 | |
JP3632306B2 (ja) | ヒートポンプ式風呂給湯システム | |
JP3800497B2 (ja) | 給湯器 | |
JP5150300B2 (ja) | ヒートポンプ式給湯装置 | |
JP2006017377A (ja) | ヒートポンプ給湯機 | |
JP3703995B2 (ja) | ヒートポンプ給湯機 | |
JP2010054145A (ja) | ヒートポンプ給湯機 | |
JP2005188923A (ja) | ヒートポンプ給湯機 | |
JP4134969B2 (ja) | 貯湯式ヒートポンプ給湯装置 | |
US20240230157A9 (en) | Storage type heat pump hot water supplying apparatus | |
JP2006234211A (ja) | ヒートポンプ給湯機 | |
JPH07218003A (ja) | 冷凍装置の制御方式 | |
CN110513924B (zh) | 定频空调器的控制方法 | |
JP7374038B2 (ja) | 暖房システム |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21939175 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2023516868 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18546117 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2021939175 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2021939175 Country of ref document: EP Effective date: 20231127 |