WO2013038692A1 - ヒートポンプ給湯機 - Google Patents
ヒートポンプ給湯機 Download PDFInfo
- Publication number
- WO2013038692A1 WO2013038692A1 PCT/JP2012/005869 JP2012005869W WO2013038692A1 WO 2013038692 A1 WO2013038692 A1 WO 2013038692A1 JP 2012005869 W JP2012005869 W JP 2012005869W WO 2013038692 A1 WO2013038692 A1 WO 2013038692A1
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- WIPO (PCT)
- Prior art keywords
- water
- electrolyzer
- initial operation
- heat pump
- electrode pair
- Prior art date
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- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
-
- 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
- F24D19/0092—Devices for preventing or removing corrosion, slime or scale
-
- 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
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/001—Guiding means
- F24H9/0015—Guiding means in water channels
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0275—Heating of spaces, e.g. rooms, wardrobes
- H05B1/0283—For heating of fluids, e.g. water heaters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/03—Electrodes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/60—Heating arrangements wherein the heating current flows through granular powdered or fluid material, e.g. for salt-bath furnace, electrolytic heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/4613—Inversing polarity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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- 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
-
- 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/08—Storage tanks
Definitions
- the present invention relates to a heat pump water heater equipped with an electrolyzer.
- a heat pump water heater is a tank that stores water, a refrigerant circuit having a water heat exchanger that heats water by heat exchange with the refrigerant, and water stored in the tank is sent to the water heat exchanger to And a conduit for returning water heated in the exchanger to the tank.
- the water stored in the tank usually uses tap water or well water as a water supply source.
- Tap water and well water contain components such as calcium ions and magnesium ions that cause scale (hereinafter referred to as scale components). Therefore, scales such as calcium salt and magnesium salt are deposited in the heat pump water heater.
- groundwater such as well water has a higher concentration of the scale component than tap water, and has a water quality that tends to cause scale.
- a scale tends to precipitate especially. If the scale is deposited and deposited on the inner surface of the pipe in the water heat exchanger, there may be a problem that the heat transfer performance of the water heat exchanger is lowered or the flow path of the pipe is narrowed.
- Patent Document 1 discloses a water heater in which a heat exchanger for combustion gas and water is provided in a flow path of the combustion gas.
- an electrode-type scale component precipitation apparatus is provided in a pipe on the water supply inlet side of the heat exchanger.
- it is supposed that it can prevent that a scale accumulates in a heat exchanger by depositing a part of scale component on the surface of an electrode in an electrode type scale component precipitation apparatus.
- the scale deposited on the surface of the electrode can be peeled off from the surface of the electrode by inverting the potential of the electrode of the electrode-type scale component precipitation depositing device at every set time.
- An object of the present invention is to provide a heat pump water heater that can effectively suppress the precipitation of scale in a water heat exchanger.
- the heat pump water heater of the present invention includes a tank (15) for storing water, a refrigerant circuit (10) having a water heat exchanger (21) for heating water by heat exchange with the refrigerant, and the tank (15).
- the stored water is sent to the water heat exchanger (21), and the water conduits (27, 29) for returning the water heated in the water heat exchanger (21) to the tank (15); 27, 29), an electrolyzer (41) having an electrode pair (49) provided in the water channel upstream of the water heat exchanger (21) in the water flow path, and the electrolyzer ( 41), the polarity of the electrode pair (49) is reversed, and the water treated in the electrolyzer (41) from when the polarity is reversed to when a predetermined condition is satisfied, Located upstream of the heat exchanger (21) That the control unit for executing inversion during initial operation of discharging at the upstream position (33), and a.
- the heat pump water heater 11 includes a heat pump unit 13, a hot water storage unit 17, an electrolyzer 41, and a controller 32 that controls them.
- the heat pump unit 13 includes a refrigerant circuit 10, and the refrigerant circuit 10 includes a compressor 19, a water heat exchanger 21, an electric expansion valve 23, an air heat exchanger 25, and piping connecting them. .
- carbon dioxide is used as the refrigerant circulating in the heat pump unit 13, but the present invention is not limited to this, and other refrigerants can also be used.
- the refrigerant exchanges heat with water circulating in the hot water storage unit 17 in the water heat exchanger 21 to heat the water, and exchanges heat with the outside air in the air heat exchanger 25 to absorb heat from the outside air.
- the hot water storage unit 17 includes a tank 15 for storing water and a pump 31.
- the tank 15 and the water heat exchanger 21 are connected by a water conduit.
- the water conduit includes an inlet pipe 27 that sends water from the tank 15 to the water heat exchanger 21, and a hot water outlet pipe 29 that returns water heated by exchanging heat with the water heat exchanger 21 to the tank 15.
- the water intake pipe 27 is provided with a pump 31 for feeding water.
- the pump 31 causes the water in the tank 15 to flow out from the lower part of the tank 15 to the incoming water pipe 27, passes through the water heat exchanger 21 and the hot water outlet pipe 29 in this order, and returns to the upper part of the tank 15.
- a water supply pipe 37 and a hot water supply pipe 35 are connected to the tank 15.
- the hot water supply pipe 35 is connected to the upper part of the tank 15.
- the hot water supply pipe 35 is provided to take out hot water stored in the tank 15 and supply hot water to a bathtub or the like.
- the water supply pipe 37 is connected to the bottom of the tank 15.
- the water supply pipe 37 is provided to supply low-temperature water from the water supply source into the tank 15.
- a water supply source for supplying water to the tank 15 for example, tap water or ground water such as well water can be used.
- the water heater 11 of the present embodiment is a transient water heater that does not return the hot water supplied from the hot water supply pipe 35 to the tank 15.
- the electrolyzer 41 is provided at a position upstream of the water heat exchanger 21 in the incoming water pipe 27 and downstream of the pump 31.
- the electrolyzer 41 has a plurality of electrode pairs 49 described later (see FIG. 2).
- the controller 32 includes a control unit 33 and a memory (storage unit) 34.
- the memory 34 stores a boiling operation schedule, a time when the scale is discharged from the electrolyzer 41, a time when the polarity of the electrode pair 49 is reversed, and the like.
- the controller 33 controls the boiling operation of boiling water in the tank 15 based on the boiling operation schedule stored in the memory 34. Further, the control unit 33 executes control for inverting the polarity of the electrode pair 49 in the electrolyzer 41, control for discharging the scale from the electrolyzer 41, and the like. These controls regarding the electrolyzer 41 will be described later.
- the control unit 33 drives the compressor 19 of the heat pump unit 13 to adjust the opening degree of the electric expansion valve 23 and drives the pump 31 of the hot water storage unit 17. .
- low-temperature water in the tank 15 is sent to the water heat exchanger 21 through the inlet pipe 27 from the water outlet provided at the bottom of the tank 15, and is heated in the water heat exchanger 21.
- the heated high-temperature water is returned into the tank 15 from a water inlet provided in the upper part of the tank 15 through the hot water supply pipe 29.
- hot water is stored in the tank 15 in order from the upper part.
- scale components contained in water are removed by the electrolyzer 41.
- the heat pump water heater 11 of the present embodiment is a transient water heater.
- the water (hot water) supplied from the hot water supply pipe 35 is used by the user and does not return to the tank 15. Accordingly, the same amount of water supplied from the tank 15 through the hot water supply pipe 35 is supplied to the tank 15 from the water supply source through the water supply pipe 37. That is, the tank 15 is frequently replenished with water containing scale components from a water supply source such as tap water or well water, and the amount of replenishment is also large. Therefore, in the case of a transient heat pump water heater, it is necessary to remove scale components more efficiently than the circulating cooling water circulation device or the circulating water heater.
- FIG. 2 is a cross-sectional view showing an example of the electrolyzer 41 used in the heat pump water heater 11.
- the electrolyzer 41 includes a container 47, a plurality of electrode pairs 49, and a power supply 53.
- As the power source 53 for example, a DC power source is used.
- Each electrode pair 49 is composed of adjacent electrode plates 51 and 52.
- the container 47 has a substantially rectangular parallelepiped shape, but is not limited thereto.
- the container 47 has a first wall portion 471 located on the upstream side of the water flow, a second wall portion 472 located on the downstream side, and a side wall portion 48 connecting these wall portions 471 and 472.
- the first wall portion 471 and the second wall portion 472 are opposed to the direction in which the side wall portion 48 extends (the arrangement direction of the plurality of electrode plates 51 and 52).
- the side wall 48 has a third wall 473 and a fourth wall 474 shown in FIG.
- the third wall portion 473 and the fourth wall portion 474 face each other in the height direction (vertical direction).
- the third wall portion 473 is located below the fourth wall portion 474.
- the third wall portion 473 is provided with a scale discharge port 61 as a discharge portion.
- the scale discharge port 61 is provided at a substantially intermediate position in the longitudinal direction of the container 47.
- a discharge pipe 64 is connected to the scale discharge port 61.
- the discharge pipe 64 is provided with an opening / closing valve 65. The opening / closing operation of the opening / closing valve 65 is controlled by the control unit 33.
- the 1st wall part 471 has the 1st distribution port 43 which functions as an entrance of water.
- the second wall portion 472 has a second circulation port 45 that functions as an outlet for water.
- a water inlet pipe 27 is connected to each of the first circulation port 43 and the second circulation port 45.
- the first circulation port 43 is provided in the first wall portion 471 at a lower position closer to the third wall portion 473 than the fourth wall portion 474, and the second circulation port 45 is arranged in the second wall portion 472. Although it is provided at an upper position closer to the fourth wall portion 474 than the third wall portion 473, it is not limited thereto.
- the first flow port 43 may be provided in the first wall portion 471 at an upper position closer to the fourth wall portion 474 than the third wall portion 473, and the third wall portion 473 and the fourth wall portion 473 may be provided in the fourth wall portion 473. You may be provided in the center position between wall parts 474. Further, the second flow port 45 may be provided at a lower position in the second wall portion 472 that is closer to the third wall portion 473 than to the fourth wall portion 474. You may be provided in the center position between wall parts 474.
- the plurality of electrode plates 51 and 52 are disposed in the container 47.
- the plurality of electrode plates 51 and 52 are arranged along the longitudinal direction of the container 47.
- Examples of the material of the electrode plates 51 and 52 include titanium, platinum, nickel, carbon, graphite, copper, and vitreous carbon.
- the electrode plates 51 and 52 are platinum or electrodes mainly composed of platinum, or the surface of a substrate mainly composed of titanium or the like is mainly composed of platinum or platinum. An electrode coated with a material is preferred.
- the plurality of electrode plates 51 and 52 are arranged at intervals in the thickness direction of the electrode plates. Each electrode plate is arranged in a posture extending in a direction substantially perpendicular to the arrangement direction. In the present embodiment, the arrangement direction of the plurality of electrode plates 51 and 52 substantially coincides with the direction in which the side wall 48 extends (the longitudinal direction of the container 47), but is not limited thereto. Moreover, in this embodiment, although the space
- the plurality of electrode plates 51 and 52 include a plurality of first electrode plates 51 connected to one pole of the power supply 53 and a plurality of second electrode plates 52 connected to the other pole of the power supply 53.
- the first electrode plate 51 extends from the base end portion located on the third wall portion 473 toward the fourth wall portion 474.
- the base end portion of each first electrode plate 51 is connected to a connecting portion 54 that extends in a direction substantially parallel to the third wall portion 473.
- the connecting portion 54 is connected to one pole of the power supply 53.
- the connecting portion 54 is embedded in the third wall portion 473, but is not limited to this.
- the connecting portion 54 may not be embedded in the third wall portion 473.
- a gap G ⁇ b> 1 through which water can flow is provided between the distal end portion (end portion on the fourth wall portion 474 side) of each first electrode plate 51 and the inner surface of the fourth wall portion 474.
- the second electrode plate 52 extends from the base end portion located on the fourth wall portion 474 toward the third wall portion 473.
- the base end portion of each second electrode plate 52 is connected to a connecting portion 56 that extends in a direction substantially parallel to the fourth wall portion 474.
- This connecting portion 56 is connected to the other pole of the power source 53.
- the connection part 56 is embed
- the connecting portion 56 may not be embedded in the fourth wall portion 474.
- a gap G ⁇ b> 2 through which water can flow is provided between the tip end portion (the end portion on the third wall portion 473 side) of each second electrode plate 52 and the inner surface of the third wall portion 473.
- the gap between the electrode plates 51 and 52 in each electrode pair 49 functions as a flow path (water flow path) F through which water flows. Thereby, a meandering flow path is formed in the container 47.
- the electrolyzer 41 includes a reversing mechanism 63 for reversing the polarity of each electrode pair 49.
- the reversing mechanism 63 is controlled by the control unit 33.
- the reversing mechanism 63 has a contact switching unit 71 and a contact switching unit 72, and reverses the polarity of the electrode plates 51 and 52 by switching the contact of the contact switching unit 71 and the contact of the contact switching unit 72. Can do.
- the reversing mechanism 63 as shown in FIG. 2 is adopted, but the reversing mechanism 63 is not limited to the form shown in FIG. 2 and can reverse the polarities of the electrode plates 51 and 52. Other forms can be employed if any. Specifically, for example, in this embodiment, when the reversing mechanism 63 is in the state shown on the left side in FIG. 2, the plurality of first electrode plates 51 are connected to the negative electrode of the power source 53, and the plurality of second electrode plates 52 are connected to the power source 53. Connected to the positive electrode. On the other hand, when the reversing mechanism 63 is in the state shown on the right side in FIG. 2, the plurality of first electrode plates 51 are connected to the positive electrode of the power source 53, and the plurality of second electrode plates 52 are connected to the negative electrode of the power source 53. 4 to 8, the reversing mechanism 63 is not shown.
- the boiling operation schedule is normally set so that the boiling operation is performed using low-cost electric power at night. Specifically, for example, the boiling operation is performed in a time zone from 22:00 to 6 o'clock.
- the control unit 33 executes the following reversal initial operation.
- the initial operation at the time of inversion is executed in a time zone other than the boiling operation.
- the polarity of the electrode pair 49 is reversed in the electrolyzer 41, and the water treated in the electrolyzer 41 after the polarity is reversed until a predetermined condition is satisfied, It discharges at a position upstream from the water heat exchanger 21.
- the reason for executing such initial operation during reversal is as follows.
- FIG. 3 is a graph showing the relationship between electrolysis time and water hardness.
- the time point of zero (min) on the horizontal axis indicates the time when the polarity of the electrode pair 49 is reversed.
- the anode the cathode before the reversal.
- the water hardness (ppm) that is, the concentration of the scale component (ppm) temporarily becomes higher than that at the time of polarity reversal.
- the predetermined condition includes, for example, that the elapsed time from the reversal of the polarity of the electrode pair 49 in the initial operation during reversal reaches a predetermined reference time t, and the processing in the reversal initial operation
- the present invention is not limited to this, for example, that the water quality such as the hardness of the water reaches a predetermined reference value h.
- a condition based on a measurement value other than the reference time t and the reference value h may be employed.
- the elapsed time is measured, for example, by a timer (not shown).
- the reference time t can be set to, for example, the time t1 until the water quality reaches the same hardness as the initial hardness h1 (ppm) at the time of polarity reversal, but is not limited thereto.
- the reference time t may be set to a value larger than the time t1, such as a time t2 until reaching the hardness h2 halved with respect to the initial hardness h1.
- the reference time t can be set to 30 minutes, for example, but is not limited thereto.
- Such a reference time t can be determined based on, for example, a database in which the relationship between water quality and time is previously correlated by experiment.
- the water quality can be detected, for example, by measuring the water conductivity.
- the water quality can also be detected by, for example, a sensor that measures the concentration of calcium ions.
- the water quality reference value h can be set to the above-described initial hardness h1, but is not limited thereto.
- the reference value h may be set to a value smaller than the initial hardness h1, such as a hardness h2 that is halved from the initial hardness h1.
- the reference value h can be set to a hardness of 150 ppm, for example, but is not limited to this.
- the former condition and the latter condition are predetermined water quality conditions based on the water quality.
- FIG. 4 is a schematic diagram illustrating a control example 1 of the heat pump water heater 11.
- the control unit 33 applies a voltage to the electrode pair 49 in a state where the water is prevented from entering and exiting the container 47 of the electrolysis apparatus 41 in the initial operation at the time of reversal. If it is determined that the condition is satisfied, the processed water is controlled to be discharged at the upstream position. In order to prevent water from entering and leaving the container 47, for example, the pump 31 may be stopped.
- the control example 1 includes a process A1 to a process E1.
- the controller 33 performs a boiling operation. Specifically, the control unit 33 operates the compressor 19 and adjusts the opening degree of the electric expansion valve 23 to circulate the refrigerant in the refrigerant circuit 10.
- the control unit 33 operates the pump 31, and the plurality of first electrode plates 51 are connected to the positive electrode of the power source 53 and the plurality of second electrode plates 52 are the negative electrode of the power source 53 as shown in Step A ⁇ b> 1 in FIG. 4. A voltage is applied from the power source 53 to the electrode pair 49 in a state connected to.
- the on-off valve 65 is closed.
- control unit 33 When the control unit 33 receives the boiling operation completion signal, the control unit 33 stops the compressor 19 and executes a control to stop the pump 31 to end the boiling operation. Then, the control unit 33 executes the initial operation at the time of reversal of the following processes B1 to D1.
- step B1 the control unit 33 performs control to invert the polarity of the electrode pair 49 in the electrolyzer 41.
- the compressor 19 and the pump 31 are stopped.
- step C ⁇ b> 1 the controller 33 treats the water in the container 47 by applying a voltage to the electrode pair 49 while preventing water from entering and leaving the container 47.
- step C1 since the pump 31 is stopped, water does not enter or leave the container 47.
- the application of the voltage to the electrode pair 49 is continued until a predetermined condition such as the time condition and the water quality condition described above is satisfied.
- step C1 the scale S deposited on the second electrode plate 52 in step A1 drops off from the second electrode plate 52 and settles on the bottom of the container 47.
- step C ⁇ b> 1 the scale component in the water in the container 47 is deposited as the scale S on the plurality of first electrode plates 51.
- control unit 33 determines that the condition is satisfied, the control unit 33 performs control to stop the application of the voltage to the electrode pair 49.
- step D1 the control unit 33 executes control for discharging the scale precipitated in the container 47.
- the pump 31 is stopped and there is no flow of water in the container 47.
- the control unit 33 controls the on-off valve 65 so as to be in the open state.
- the scale S precipitated at the bottom of the container 47 is discharged to the outside of the container 47 through the scale discharge port 61 and the discharge pipe 64 together with the water in the container 47.
- the on-off valve 65 is closed. Since the scale discharge port 61 is located on the upstream side of the water heat exchanger 21, it is possible to prevent water having a high scale concentration from being sent to the water heat exchanger 21.
- the control unit 33 executes the boiling operation on the next day shown in the step E1 based on the boiling operation schedule.
- the process E1 is the same as the process A1 except that the polarity of the electrode pair 49 is opposite to that of the process A1, and after the process E1 is completed, the same control as the processes B1 to D1 is executed.
- FIG. 5 is a schematic diagram showing a control example 2 of the heat pump water heater 11. As shown in FIG. 5, the control example 2 includes steps A2 to G2.
- the inversion initial operation shown in the process D2 to the process F2 is the same as the process B1 to the process D1 in the control example 1.
- the water in the container 47 has a higher electrolyte concentration as shown in the steps B2 and C2.
- the point which is replaced with water is different from the control example 1. Specifically, it is as follows.
- step A2 When the boiling operation is executed in step A2, hot water is stored in the tank 15. Further, the scale component removed by the electrolyzer 41 during the boiling operation is deposited as a scale S on the plurality of second electrode plates 52. A part of the removed scale component is deposited on the bottom of the container 47.
- the control unit 33 receives the boiling operation completion signal, the control unit 33 stops the compressor 19 and executes a control to stop the pump 31 to end the boiling operation.
- step B2 the control unit 33 executes control for opening the on-off valve 65.
- the water in the container 47 and the scale S deposited on the bottom of the container 47 are discharged to the outside of the container 47 through the scale discharge port 61 and the discharge pipe 64.
- the pump 31 is stopped and there is no flow of water in the container 47.
- the on-off valve 65 is closed.
- step C ⁇ b> 2 the control unit 33 pours water with a high electrolyte concentration into the container 47. Specifically, the control unit 33 drives the pump 31 to discharge water in the tank 15 from a water outlet provided at the bottom of the tank 15, and injects water into the container 47 of the electrolyzer 41 through the water inlet pipe 27. To do. Since the water in the tank 15 is not treated by the electrolyzer 41, the electrolyte concentration is higher than that in the container 47 immediately after the completion of the boiling operation in step A2.
- the water poured into the container 47 in the process C2 is not limited to the case where the water stored in the tank 15 is used. That is, the water poured into the container 47 in the step C2 may be water having an electrolyte concentration higher than the water in the container 47 immediately after completion of the boiling operation in the step A2, and is provided separately from the tank 15, for example. You may use the water of the water supply source of omission of illustration.
- step D2 the control unit 33 performs control to invert the polarity of the electrode pair 49 in the electrolyzer 41. Since the initial operation during reversal shown in the steps D2 to F2 is the same as the steps B1 to D1 in the control example 1, description thereof is omitted.
- the control unit 33 performs the next day's boiling operation shown in step G2 based on the boiling operation schedule.
- the process G2 is the same as the process A2 except that the polarity of the electrode pair 49 is opposite to that of the process A2. After the process G2 is completed, the same control as in the processes B2 to F2 is executed.
- FIG. 6 is a schematic diagram showing a control example 3 of the heat pump water heater 11. As shown in FIG. 6, the control example 3 includes steps A3 to G3.
- the boiling operation shown in the process A3 and the inversion-time initial operation shown in the process B3 to the process D3 are the same as the process A1 to the process D1 of the control example 1.
- water is poured into the container 47 as shown in the step E3, and the second predetermined in the state in which the entry and exit of water is prevented in the container 47 as shown in the step F3.
- the second initial operation in which a voltage is applied to the electrode pair 49 is further executed until the condition is satisfied. Specifically, it is as follows.
- the control unit 33 executes control for pouring water into the container 47 in process E3. Specifically, the control unit 33 drives the pump 31 to discharge water in the tank 15 from a water outlet provided at the bottom of the tank 15, and injects water into the container 47 of the electrolyzer 41 through the water inlet pipe 27. To do. In this process E3, the on-off valve 65 is in a closed state. The water poured into the container 47 in the step E3 is in a state where electrolysis is not performed.
- step F ⁇ b> 3 the control unit 33 executes control to process the water in the container 47 by applying a voltage to the electrode pair 49 in a state where water enters and exits the container 47.
- step F3 since the pump 31 is stopped, water does not enter or leave the container 47.
- the application of the voltage to the electrode pair 49 is continued until a predetermined second condition is satisfied.
- the scale component in the water in the container 47 is deposited as the scale S on the plurality of first electrode plates 51.
- the elapsed time after the voltage is applied to the electrode pair 49 in step F3 reaches a predetermined reference time (time condition), the hardness of the water injected in step E3 (scale component) For example, reaching a reference value (water quality condition) indicating that the hardness of water (concentration of scale component) has decreased to a predetermined ratio with respect to (concentration).
- a reference value water quality condition
- the reference time can be set to, for example, a time until the water quality reaches half the initial hardness (ppm) when a voltage is applied, but is not limited thereto.
- the reference value of the water quality can be set to, for example, a hardness halved from the above-described initial hardness, but is not limited thereto.
- control unit 33 determines that the second condition is satisfied, the control unit 33 performs control for stopping the application of the voltage to the electrode pair 49, and proceeds to Step G3.
- Step G3 is the same as Step A3 except that the polarity of the electrode pair 49 is opposite to that of Step A3.
- the same control as in the processes B3 to F3 is executed.
- the water intake pipe 27 is provided with a branch path 81.
- the branch path 81 is located upstream from the water heat exchanger 21 and is located downstream from the electrolyzer 41.
- a control example of the heat pump water heater 11 according to the second embodiment will be described.
- control example 4 includes a process A4 to a process F4.
- the water in the container 47 in the initial operation at the time of inversion, the water in the container 47 is processed by applying a voltage to the electrode pair 49 in a state in which the water is prevented from entering and exiting the container 47.
- the water in the container 47 is treated by applying a voltage to the electrode pair 49 while circulating the water in the container 47.
- the control example 4 is different from the control example 1.
- the control unit 33 discharges the water treated in the electrolyzer 41 through the branch path 81 until the condition is satisfied after the polarity of the electrode pair 49 is reversed in the initial operation at the time of reversal.
- the control unit 33 discharges the water treated in the electrolyzer 41 through the branch path 81 until the condition is satisfied after the polarity of the electrode pair 49 is reversed in the initial operation at the time of reversal.
- the incoming water pipe 27 and the branch path 81 constitute a T-shaped path.
- An unillustrated switching mechanism capable of switching the water path is provided at the branch point of the T-junction.
- an unillustrated on-off valve may be provided in the branch path 81, and an unillustrated on-off valve may be provided on the downstream side of the branch point in the incoming water pipe 27.
- the control unit 33 controls switching of the switching mechanism or opening / closing of the on-off valve.
- the boiling operation is executed in the process A4.
- This boiling operation is the same as step A1 in Control Example 1.
- hot water is stored in the tank 15.
- scale components contained in the water flowing through the inlet pipe 27 from the tank 15 toward the water heat exchanger 21 are removed by the electrolyzer 41.
- the removed scale component is deposited as a scale S on the plurality of second electrode plates 52.
- a part of the removed scale component is deposited on the bottom of the container 47.
- control unit 33 When the control unit 33 receives the boiling operation completion signal, the control unit 33 stops the compressor 19, stops the pump 31, executes control to stop the application of voltage to the electrode pair 49, and ends the boiling operation.
- step B4 the control unit 33 executes control for discharging the scale precipitated in the container 47.
- the pump 31 is stopped and there is no flow of water in the container 47.
- the control unit 33 controls the on-off valve 65 so as to be in the open state.
- the scale S precipitated at the bottom of the container 47 is discharged to the outside of the container 47 through the scale discharge port 61 and the discharge pipe 64 together with the water in the container 47.
- the on-off valve 65 is closed.
- step C ⁇ b> 4 the control unit 33 executes control for pouring water into the container 47. Specifically, the control unit 33 drives the pump 31 to discharge water in the tank 15 from a water outlet provided at the bottom of the tank 15, and injects water into the container 47 of the electrolyzer 41 through the water inlet pipe 27. To do. In step C4, the on-off valve 65 is in a closed state.
- step D4 the control unit 33 performs control to invert the polarity of the electrode pair 49 in the electrolyzer 41. Further, the control unit 33 executes control for driving the pump 31.
- the path in the T-shaped path between the water inlet pipe 27 and the branch path 81 is selected so that water flows into the branch path 81 by the switching mechanism and the on-off valve. It should be noted that this selection may be made when the next step E4 is started.
- step E4 the control unit 33 continuously applies voltage to the electrode pair 49 with the polarity reversed in step D4 and continuously drives the pump 31 to supply water flowing in the container 47.
- the water in the tank 15 is supplied into the container 47 of the electrolyzer 41 through the water inlet pipe 27.
- the supplied water passes through the container 47, flows out into the incoming water pipe 27, and flows into the branch path 81.
- the water flowing into the branch path 81 is discharged out of the system of the heat pump water heater 11.
- step E4 the scale S deposited on the second electrode plate 52 in the step A4 drops off from the second electrode plate 52 and flows out from the container 47 to the water inlet pipe 27 together with the water in the container 47.
- step E ⁇ b> 4 some of the scale components in the water in the container 47 are deposited as scale S on the plurality of first electrode plates 51, and are also deposited on the bottom of the container 47.
- control unit 33 determines that the condition is satisfied, the control unit 33 performs control of applying a voltage to the electrode pair 49 and stopping the pump 31.
- Step F4 the control unit 33 performs the next day's boiling operation shown in Step F4 based on the boiling operation schedule.
- the process F4 is the same as the process A4 except that the polarity of the electrode pair 49 is opposite to that of the process A4.
- the same control as in the processes B4 to E4 is executed.
- the initial operation at the time of inversion is executed, so that the precipitation of scale in the water heat exchanger 21 can be effectively suppressed.
- the reversal initial operation is executed at a time other than the boiling operation, so that it is not necessary to interrupt the boiling operation for the reversal initial operation. Therefore, it is possible to prevent the efficiency of the boiling operation (the efficiency of the heat pump) from being reduced due to the execution of the initial operation during inversion.
- Control Example 1 to Control Example 3 a voltage is applied to the electrode pair 49 in a state where water is prevented from entering and exiting the water channel in the electrolyzer 41, and the water in the water channel is treated. Since the water treated in the water channel is discharged at the upstream position, the amount of water discharged in the initial operation at the time of reversal can be minimized.
- the water in the electrolyzer 41 is replaced with water having a higher electrolyte concentration and the reversal initial operation is executed. Therefore, it is possible to prevent the efficiency of electrolysis in the reversal initial operation from being lowered.
- the second initial operation is executed to reduce the concentration of the scale component in the electrolyzer 41 in advance, so that the scale component is supplied to the water heat exchanger 21 in the subsequent boiling operation. It can suppress that high concentration water is sent.
- the electrolysis apparatus 41 has been described as an example in which the electrolysis apparatus 41 includes a plurality of electrode pairs 49, but the present invention is not limited thereto.
- the electrolyzer 41 for example, a form in which a single electrode pair 49 is arranged in a container 47 as shown in FIG.
- the case where the electrolyzer 41 is provided in the inflow piping 27 located downstream from the pump 31 and upstream from the water heat exchanger 21 in the water flow path of the heat pump water heater 11 is given as an example.
- the electrolyzer 41 may be provided upstream of the water heat exchanger 21 in the water flow path.
- the electrolyzer 41 may be provided, for example, in the incoming water pipe 27 upstream of the pump 31, or may be provided in the water supply pipe 37 that supplies water to the tank 15 from the water supply source. Good.
- the branch path 81 in the second embodiment is provided in the water supply pipe 37.
- the said discharge path is piping etc. which are connected to the side wall etc. of the container 47 of the electrolyzer 41, for example. You may be comprised, and it may be comprised so that the water processed in the electrolyzer 41 may be discharged
- the case where the initial operation at the time of reversal is not performed during the boiling operation is exemplified, but the initial operation at the time of reversal can be performed during the boiling operation.
- the discharge part (scale discharge port 61) for discharging the scale is provided at the bottom of the container 47 is illustrated, but the present invention is not limited to this.
- the discharge part may be provided, for example, in a part located on the downstream side of the container 47.
- the discharge unit may be, for example, a scale discharge valve (for example, a three-way valve) provided separately in the water inlet pipe 27.
- the boiling operation is not executed in the time zone including the daytime like the time zone from 6 o'clock to 22 o'clock, but the present invention is not limited to this.
- an additional boiling operation may be performed as necessary even during the time period from 6 o'clock to 22 o'clock. After such additional boiling operation, the reversal initial operation is not necessarily performed.
- the container 47 has a substantially rectangular parallelepiped shape has been described as an example, but the present invention is not limited to this.
- the container 47 may have a prismatic shape other than a rectangular parallelepiped or a cylindrical shape.
- a transient hot water heater has been described as an example.
- the present invention is not limited to this.
- the present invention can also be applied to, for example, a water heater of a type in which a part of water (hot water) supplied from the hot water supply pipe 35 is returned to the tank 15 again.
- the heat pump water heater includes a tank (15) for storing water, a refrigerant circuit (10) having a water heat exchanger (21) for heating water by heat exchange with the refrigerant, and the tank (15).
- the water channel (27, 29) for sending the water stored in the water heat exchanger (21) and returning the water heated in the water heat exchanger (21) to the tank (15), and the water channel
- An electrolyzer (41) having an electrode pair (49) provided in a water channel upstream of the water heat exchanger (21) in a water flow path including (27, 29), and the electrolyzer In (41), the polarity of the electrode pair (49) is reversed, and the water treated in the electrolyzer (41) from when the polarity is reversed until a predetermined condition is satisfied, Upstream from the water heat exchanger (21) Control unit for executing inversion during initial operation of discharging upstream position (33), and a.
- control unit (33) prevents the water from entering and exiting the water channel of the electrolyzer (41) in the initial operation at the time of inversion. ) Is applied to treat the water in the water channel, and if it is determined that the condition is satisfied, it is preferable to control so that the treated water is discharged at the upstream position.
- the controller (33) converts the water in the electrolyzer (41) into an electrolyte after completion of a boiling operation for heating water in the water heat exchanger (21). It is preferable to execute the initial operation at the time of reversal by replacing the water with a higher concentration.
- the reversal initial operation is executed after the boiling operation is completed, the water present in the electrolyzer (41) after the boiling operation is completed is processed in the electrolyzer (41), and the concentration of the scale component is increased. Due to the reduced water, the electrolyte concentration is relatively low. Therefore, if the initial operation during reversal is executed in this state, the electrolysis efficiency may be lowered.
- the water in the electrolyzer (41) is replaced with water having a higher electrolyte concentration and the inversion initial operation is executed, so that the electrolysis efficiency in the inversion initial operation can be suppressed from being lowered.
- the electrolyzer (41) further includes a discharge unit (61) for discharging water to the outside, and the control unit (33) is in the initial operation during reversal. When it is determined that the condition is satisfied, it is preferable to control so that water in the electrolyzer (41) is discharged through the discharge section (61).
- the electrolysis device (41) is provided with the discharge portion (61), the water treated in the electrolysis device (41) between the polarity reversal and the condition is satisfied is surely obtained. It can be discharged at a position upstream of the water heat exchanger (21).
- the control unit (33) injects water into the electrolyzer (41) after the initial operation at the time of reversal is completed, and enters and exits water in the electrolyzer (41). It is preferable to further execute a second initial operation in which a voltage is applied to the electrode pair (49) until a predetermined second condition is satisfied in a state in which the above is prevented.
- the water poured into the electrolyzer (41) after completion of the initial operation during reversal may have a high concentration of scale components.
- electrolysis is performed while water is circulated through the water channel of the electrolyzer (41). Therefore, a part of the water poured into the electrolyzer (41) after completion of the initial operation at the time of reversal comes out of the electrolyzer (41) without being treated.
- the second initial operation is performed to reduce the concentration of the scale component in the electrolyzer (41) in advance, so that the water heat exchanger ( 21) can be prevented from sending water having a high concentration of scale components.
- control unit (33) has a second reference in which an elapsed time from the start of voltage application to the electrode pair (49) in the second initial operation is predetermined. It is determined that the second condition is satisfied when time has been reached or when the quality of the water processed in the second initial operation has reached a predetermined second reference value.
- the control unit (33) performs the electrolysis device (41) until the condition is satisfied after the polarity of the electrode pair (49) is reversed. ) And supplying the voltage to the electrode pair (49) while discharging the water treated in the electrolyzer (41) at the upstream position.
- a mode in which a discharge path (81) for discharging water treated in the electrolyzer (41) is provided at the upstream position can be exemplified.
- the discharge channel (81) is a branch channel (81) branched from the water conduit (27) located on the upstream side of the water heat exchanger (21),
- the control unit (33) supplies the water treated in the electrolyzer (41) until the condition is satisfied after the polarity of the electrode pair (49) is inverted.
- the form which controls to discharge through (81) can be illustrated.
- control unit (33) In the heat pump water heater, the control unit (33), for example, has reached a predetermined reference time after an elapse of time since the polarity of the electrode pair (49) is reversed in the initial operation during reversal. Sometimes it may be determined that the condition is satisfied. In this case, it is not necessary to provide a sensor for detecting the water quality.
- control unit (33) may determine that the condition is satisfied, for example, when the water quality of the water treated in the reversal initial operation reaches a predetermined reference value. In this case, compared with the case where it judges based on the above-mentioned reference time, it can prevent more reliably that water with a high scale component density
- concentration is sent to a hydrothermal exchanger (21).
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Abstract
Description
<ヒートポンプ給湯機>
以下、本発明の第1実施形態に係るヒートポンプ給湯機11ついて図面を参照しながら説明する。図1に示すように、本実施形態に係るヒートポンプ給湯機11は、ヒートポンプユニット13と、貯湯ユニット17と、電気分解装置41と、これらを制御するコントローラ32とを備えている。
図2は、ヒートポンプ給湯機11に用いられる電気分解装置41の一例を示す断面図である。図2に示すように、電気分解装置41は、容器47と、複数の電極対49と、電源53とを備えている。電源53としては、例えば直流電源が用いられる。各電極対49は、隣り合う電極板51,52により構成される。
図4は、ヒートポンプ給湯機11の制御例1を示す概略図である。この制御例1では、制御部33は、前記反転時初期運転において、電気分解装置41の容器47に水が出入りするのを阻止した状態で電極対49に電圧を印加して容器47内の水を処理し、前記条件が満たされたと判断すると、処理された水を前記上流位置において排出するように制御する。容器47への水の出入りを阻止するには、例えばポンプ31を停止させればよい。
図5は、ヒートポンプ給湯機11の制御例2を示す概略図である。図5に示すように、制御例2は、工程A2~工程G2を含む。
図6は、ヒートポンプ給湯機11の制御例3を示す概略図である。図6に示すように、制御例3は、工程A3~工程G3を含む。
次に、本発明の第2実施形態に係るヒートポンプ給湯機11について説明する。この第2実施形態では、電気分解装置41及び制御の流れが第1実施形態とは異なっており、第1実施形態と同様の構成については説明を省略する。
図7に示すように、制御例4は、工程A4~工程F4を含む。制御例1では、前記反転時初期運転において、容器47に水が出入りするのを阻止した状態で電極対49に電圧を印加して容器47内の水を処理するが、この制御例4では、反転時初期運転において、容器47内において水を流通させながら電極対49に電圧を印加して容器47内の水を処理する。この点で、制御例4は制御例1と異なっている。
なお、本発明は、前記実施形態に限られるものではなく、その趣旨を逸脱しない範囲で種々変更、改良等が可能である。
11 ヒートポンプ給湯機
15 タンク
21 水熱交換器
27 入水配管
29 出湯配管
31 ポンプ
32 コントローラ
33 制御部
34 記憶部
35 給湯配管
37 給水配管
41 電気分解装置
49 電極対
51 第1電極板
52 第2電極板
53 電源
61 排出口
81 分岐路
Claims (10)
- 水を貯留するタンク(15)と、
冷媒との熱交換により水を加熱する水熱交換器(21)を有する冷媒回路(10)と、
前記タンク(15)に貯留された水を前記水熱交換器(21)に送り、前記水熱交換器(21)において加熱された水を前記タンク(15)に戻す導水路(27,29)と、
前記導水路(27,29)を含む水の流路において前記水熱交換器(21)よりも上流側の水路内に設けられた電極対(49)を有する電気分解装置(41)と、
前記電気分解装置(41)において前記電極対(49)の極性を反転させるとともに、極性が反転してから予め定められた条件が満たされるまでの間に前記電気分解装置(41)において処理された水を、前記水熱交換器(21)よりも上流側に位置する上流位置において排出する反転時初期運転を実行する制御部(33)と、を備えているヒートポンプ給湯機。 - 前記制御部(33)は、前記反転時初期運転において、前記電気分解装置(41)の前記水路に水が出入りするのを阻止した状態で前記電極対(49)に電圧を印加して前記水路内の水を処理し、前記条件が満たされたと判断すると、処理された水を前記上流位置において排出するように制御する、請求項1に記載のヒートポンプ給湯機。
- 前記制御部(33)は、前記水熱交換器(21)において水を加熱する沸上げ運転が完了した後、前記電気分解装置(41)内の水を電解質濃度のより高い水に入れ替えて前記反転時初期運転を実行する、請求項2に記載のヒートポンプ給湯機。
- 前記電気分解装置(41)は、水を外部に排出するための排出部(61)をさらに有し、
前記制御部(33)は、前記反転時初期運転において、前記条件が満たされたと判断すると、前記電気分解装置(41)内の水が前記排出部(61)を通じて排出されるように制御する、請求項2又は3に記載のヒートポンプ給湯機。 - 前記制御部(33)は、前記反転時初期運転が完了した後、前記電気分解装置(41)内に注水し、前記電気分解装置(41)において水の出入りを阻止した状態で予め定められた第2条件が満たされるまで前記電極対(49)に電圧を印加する第2初期運転をさらに実行する、請求項2~4のいずれか1項に記載のヒートポンプ給湯機。
- 前記制御部(33)は、前記第2初期運転において前記電極対(49)に対する電圧の印加が開始されてからの経過時間が予め定められた第2基準時間に達したとき、又は前記第2初期運転において処理された水の水質が予め定められた第2基準値に達したときに、前記第2条件が満たされたと判断する、請求項5に記載のヒートポンプ給湯機。
- 前記制御部(33)は、前記反転時初期運転において、前記電極対(49)の極性が反転してから前記条件が満たされるまで、前記電気分解装置(41)に水を供給するとともに前記電気分解装置(41)において処理された水を前記上流位置において排出しながら、前記電極対(49)に電圧を印加するように制御する、請求項1に記載のヒートポンプ給湯機。
- 前記上流位置には、前記電気分解装置(41)において処理された水を排出するための排出路(81)が設けられている、請求項7に記載のヒートポンプ給湯機。
- 前記排出路(81)は、前記水熱交換器(21)よりも上流側に位置する前記導水路(27)から分岐する分岐路(81)であり、
前記制御部(33)は、前記反転時初期運転において、前記電極対(49)の極性が反転してから前記条件が満たされるまで、前記電気分解装置(41)において処理された水を前記分岐路(81)を通じて排出するように制御する、請求項8に記載のヒートポンプ給湯機。 - 前記制御部(33)は、前記反転時初期運転において前記電極対(49)の極性が反転してからの経過時間が予め定められた基準時間に達したとき、又は前記反転初期運転において処理された水の水質が予め定められた基準値に達したときに、前記条件が満たされたと判断する、請求項1~9のいずれか1項に記載のヒートポンプ給湯機。
Priority Applications (4)
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EP20120831020 EP2757330A4 (en) | 2011-09-15 | 2012-09-14 | HOT WATER SUPPLYING DEVICE WITH HEAT PUMP |
AU2012309972A AU2012309972B2 (en) | 2011-09-15 | 2012-09-14 | Heat pump hot-water supply device |
CN201280044855.3A CN103814256A (zh) | 2011-09-15 | 2012-09-14 | 热泵热水器 |
US14/345,183 US20140353143A1 (en) | 2011-09-15 | 2012-09-14 | Heat pump hot-water supply device |
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JP2011201510A JP5375908B2 (ja) | 2011-09-15 | 2011-09-15 | ヒートポンプ給湯機 |
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EP (1) | EP2757330A4 (ja) |
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JP5224041B2 (ja) * | 2007-06-27 | 2013-07-03 | ダイキン工業株式会社 | ヒートポンプ式給湯装置 |
JP2010276302A (ja) * | 2009-05-29 | 2010-12-09 | Daikin Ind Ltd | ヒートポンプ式給湯機 |
JP2011033250A (ja) * | 2009-07-31 | 2011-02-17 | Sanyo Electric Co Ltd | 給湯装置 |
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2012
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- 2012-09-14 US US14/345,183 patent/US20140353143A1/en not_active Abandoned
- 2012-09-14 CN CN201280044855.3A patent/CN103814256A/zh active Pending
- 2012-09-14 WO PCT/JP2012/005869 patent/WO2013038692A1/ja active Application Filing
- 2012-09-14 EP EP20120831020 patent/EP2757330A4/en not_active Withdrawn
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20120280052A1 (en) * | 2010-03-05 | 2012-11-08 | Mitsubishi Heavy Industries, Ltd. | Hot-water heat pump and method of controlling the same |
US9664415B2 (en) * | 2010-03-05 | 2017-05-30 | Mitsubishi Heavy Industries, Ltd. | Hot-water heat pump and method of controlling the same |
Also Published As
Publication number | Publication date |
---|---|
AU2012309972B2 (en) | 2015-07-16 |
JP2013061143A (ja) | 2013-04-04 |
CN103814256A (zh) | 2014-05-21 |
JP5375908B2 (ja) | 2013-12-25 |
US20140353143A1 (en) | 2014-12-04 |
EP2757330A1 (en) | 2014-07-23 |
EP2757330A4 (en) | 2015-04-22 |
AU2012309972A1 (en) | 2014-04-03 |
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