WO2009130804A1 - Heat pump water heater - Google Patents
Heat pump water heater Download PDFInfo
- Publication number
- WO2009130804A1 WO2009130804A1 PCT/JP2008/064649 JP2008064649W WO2009130804A1 WO 2009130804 A1 WO2009130804 A1 WO 2009130804A1 JP 2008064649 W JP2008064649 W JP 2008064649W WO 2009130804 A1 WO2009130804 A1 WO 2009130804A1
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- WIPO (PCT)
- Prior art keywords
- hot water
- water supply
- heat exchanger
- refrigerant
- bath
- 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
- F24D17/0078—Recirculation systems
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/54—Water heaters for bathtubs or pools; Water heaters for reheating the water in bathtubs or pools
Definitions
- the present invention relates to a heat pump water heater, and more particularly to optimum operation control of a heat pump in a period including a frosting period.
- a conventional heat pump water heater has a large-capacity hot water storage tank similar to an electric water heater, operates a heat pump using cheap electricity with a discounted night rate, boils hot water during the night, and stores it in the hot water storage tank.
- the hot water storage type that uses the hot water stored in the daytime was common.
- hot water storage operation is performed in advance, hot water is stored in a small hot water storage tank of 60 to 100 L, and when the hot water is used, the heating temperature of the heat pump does not reach an appropriate temperature at the beginning of operation.
- Hot water from the hot water storage tank is mixed to supply hot water at an appropriate temperature, and when the heating temperature by the heat pump operation reaches an appropriate temperature, the hot water from the hot water storage tank is stopped and the hot water heated by the heat pump operation is directly supplied and used. is there.
- the operation control of the instantaneous heat pump water heater is controlled by changing the rotation speed of the compressor and adjusting the heating capacity in response to tank hot water or kitchen / lavatory hot water supply, and removing the air refrigerant heat exchanger (evaporator).
- Frost detects the amount of frost formation based on the temperature of the air refrigerant heat exchanger, defrosts by opening the defrost bypass valve after the frost is formed in large quantities and the heating performance of the heat pump decreases.
- the configuration was relatively simple. JP 2003-279133 A
- the heating capacity was adjusted by changing the number of rotations of the compressor in correspondence with the hot water application.
- the bath hot water temperature is constant at about 42 ° C because hot water is supplied just before bathing, but it has a function to reserve the hot water time in advance.
- a function has been added so that the hot water supply temperature can be selected from 38 ° C to 48 ° C depending on the season.
- the tank hot water temperature has been diversified, and in response to seasonal changes in hot water consumption, hot water is stored at about 65 ° C in the summer, spring and autumn, 70-75 ° C in winter, and at low temperatures in winter Some ideas have been devised, such as storing hot water at 85-90 ° C.
- heat pump operation control is controlled with priority given to each hot water supply temperature with emphasis on securing hot water supply, and optimal operation control is not always necessary from the viewpoint of energy saving. It was not. For example, when reserving a bathing hot water operation, heating efficiency may be prioritized even if the hot water filling time is long, but when a large amount of hot water supply is required, such as a shower, heating capacity must be prioritized over efficiency. Don't be. In winter, when continuous operation is prioritized, heating capacity declines due to frost formation during hot water supply for long periods of time.
- an optimal operation control means that comprehensively considers heating capacity, energy saving, defrost control, etc. for these diversified use conditions. It has been sought in the past.
- the object of the present invention is to provide a heat pump water heater that performs comprehensively optimal operation control in order to ensure heating capacity, improve heating efficiency, and save energy during a period including defrosting in winter. Is to provide.
- a heat pump refrigerant circuit having a compressor for compressing refrigerant, a water refrigerant heat exchanger for exchanging heat between water and refrigerant, an expansion valve, an air refrigerant heat exchanger for exchanging heat between air and refrigerant, and a refrigerant pipe;
- Hot water storage tank for storing hot water heated by the water refrigerant heat exchanger, in-machine circulation pump, hot water mixing valve, bath heat exchanger for exchanging heat with hot water heated by the water refrigerant heat exchanger, for bath circulation
- a hot water storage circuit for storing hot water in the hot water storage tank, a direct hot water supply circuit for directly supplying hot water heated by the water refrigerant heat exchanger to a hot water outlet,
- the operation control unit determines that the heating efficiency priority operation is performed, the operation is performed at a compressor rotation speed that maximizes the heating efficiency, and when the heating capacity priority operation is determined. Operate at a compressor speed that maximizes the heating capacity, and if it is determined as the intermediate defrosting operation, operate at a compressor speed that maximizes the heating capacity, and approximately the estimated heat pump operating time It is the structure which performs a defrost driving
- the operation control unit is configured to divide the air refrigerant heat exchanger temperature into two of about 0 ° C. or more and less than about 0 ° C. as the determination criterion. Further, the operation control unit learns the heat pump operation time for each hot water supply mode as the determination criterion, and determines the intermediate defrost operation as the optimum operation control in the hot water supply mode with an estimated operation time of about 60 minutes or more. It is. Further, the operation control unit performs the frost determination of the air refrigerant heat exchanger after the heating operation by the heat pump operation is completed, and when it is determined that the frost is formed, performs the defrost operation and then stops the heat pump operation. When it is determined that frost is not formed, the heat pump operation is stopped without performing the defrosting operation.
- Optimal driving means can be selected.
- frost formation at the end of operation is detected, and only when there is frost, the defrost operation is performed and then the operation is stopped.
- the rise characteristics can be improved, and frost formation at the end of operation can be prevented from increasing during the stop period under conditions such as low outside air temperature or snowfall.
- FIG. 1 is an overall configuration diagram showing components and connection paths of a heat pump water heater according to an embodiment of the present invention.
- the heat pump water heater according to this embodiment includes a heat pump refrigerant circuit 30, a hot water supply circuit 40, and an operation control means 50 as a whole.
- the heat pump refrigerant circuit 30 is configured by a two-cycle system of a first refrigerant circuit 30a and a second refrigerant circuit 30b, and includes refrigerant-side heat transfer tubes 2a and 2b disposed in the compressors 1a and 1b and the water-refrigerant heat exchanger 2, and expansion.
- the valves 3a and 3b and the air refrigerant heat exchangers 4a and 4b are sequentially connected via refrigerant pipes, respectively, in which refrigerant is enclosed.
- the compressors 1a and 1b can be controlled in capacity, and are operated with a large capacity when supplying a large amount of hot water.
- the compressors 1a and 1b can control the rotational speed from a low speed (for example, 700 rotations / minute) to a high speed (for example, 7000 rotations / minute) by PWM control, voltage control (for example, PAM control) and combination control thereof. It has become.
- the water refrigerant heat exchanger 2 includes refrigerant side heat transfer tubes 2a and 2b and water supply side heat transfer tubes 2c and 2d, and performs heat exchange between the refrigerant side heat transfer tubes 2a and 2b and the water supply side heat transfer tubes 2c and 2d. It is configured as follows.
- expansion valves 3a and 3b an electric expansion valve having a quick response at the time of opening adjustment is generally used, and the medium temperature and high pressure refrigerant sent through the water refrigerant heat exchanger 2 is depressurized and is easily evaporated. It sends to air refrigerant heat exchanger 4a, 4b. Further, the expansion valves 3a and 3b function to adjust the refrigerant circulation amount in the heat pump refrigerant circuit by changing the opening of the refrigerant passage, and increase the opening to increase the amount of medium temperature refrigerant to the air refrigerant heat exchangers 4a and 4b. It also serves as a defrosting device that sends frost to melt.
- the air refrigerant heat exchangers 4a and 4b take in outside air by rotation of the blower fans 5a and 5b, perform heat exchange between the air and the refrigerant, and absorb heat from the outside air.
- the hot water supply circuit 40 includes a water circulation circuit for performing (1) hot water storage, (2) direct hot water supply, (3) tank hot water supply, (4) bath hot water filling, and (5) bath reheating.
- the hot water storage circuit (1) is a water circuit for storing hot water in the hot water storage tank 16 by the tank boiling operation.
- the hot water storage tank 16, the in-machine circulation pump 17, the hydrothermal AC sensor 10, the water supply side heat transfer pipes 2c, 2d, A hot water mixing valve 11 and a hot water storage tank 16 are sequentially connected via a water pipe.
- the direct hot water supply circuit (2) includes a water supply fitting 6, a pressure reducing valve 7, a water supply water amount sensor 8, a water supply side check valve 9, a hydrothermal AC amount sensor 10, water supply side heat transfer tubes 2c and 2d, a hot water supply mixing valve 11, and hot water mixing.
- a valve 12, a flow rate adjustment valve 13, and a kitchen tapping metal fitting 14 are sequentially connected via a water pipe.
- the water supply fitting 6 is connected to a water supply source such as a water supply, and the kitchen tap metal fitting 14 is connected to a kitchen faucet 15 or the like.
- the tank hot water supply circuit (3) includes a water supply fitting 6, a pressure reducing valve 7, a water supply amount sensor 8, a water supply side check valve 9, a hot water storage tank 16, a hot water supply mixing valve 11, a hot water mixing valve 12, a flow rate adjusting valve 13, and a kitchen tapping metal fitting. 14 are sequentially connected via a water pipe.
- the bath hot water filling circuit (4) includes a water supply fitting 6, a pressure reducing valve 7, a water supply amount sensor 8, a water supply side check valve 9, a hydrothermal AC amount sensor 10, water supply side heat transfer tubes 2c and 2d, a hot water supply mixing valve 11, and hot water.
- a mixing valve 12, a flow rate adjusting valve 13, a bath pouring valve 18, a flow switch 19, a bath circulation pump 20, a water level sensor 21, a bath inlet / outlet fitting 22, a bath circulation adapter 23, and a bathtub 24 are sequentially connected via a water pipe. It is configured. Moreover, it connects so that it can supply hot water to the bath faucet 25 and the shower (not shown) from the bath entry / exit metal fitting 22 with the bathtub 24.
- hot water supply from the hot water storage tank 16 to the bathtub 24 is also performed within the range where the hot water amount in the hot water storage tank 16 does not fall below the minimum required amount, as well as direct hot water supply by the bath hot water filling circuit.
- the bath memory circuit (5) includes a bathtub 24, a bath circulation adapter 23, a bath inlet / outlet fitting 22, a water level sensor 21, a bath circulation pump 20, a flow switch 19, a bath water heat transfer tube 27b of a bath heat exchanger 27, a bath A hot metal fitting 26, a bath circulation adapter 23, and a bathtub 24 are sequentially connected via a water pipe.
- the bath water is circulated by the bath chasing circuit (5), the heat pump operation and the in-machine circulation pump 17 are operated, the hot water on-off valve 28 is opened, and the water / refrigerant heat exchanger 2 is heated.
- the hot water is circulated through a hot water heat transfer tube 27a provided in the heat exchanger 27 for bath, heat is exchanged between the hot water heat transfer tube 27a and the bath water heat transfer tube 27b, and the bath is reheated.
- the operation control means 50 operates / stops the heat pump refrigerant circuit 30 and rotates the compressors 1a and 1b according to the operation settings of the kitchen remote controller 51 (not only in the kitchen but also at the hot water outlet such as a washroom) and the bath remote controller 52.
- a hot water storage operation a direct hot water supply operation, a tank hot water operation, a bath hot water operation, and a bath chasing operation are performed.
- the operation control means 50 controls the rotation speed of the compressors 1a and 1b, and gradually increases the rotation speed at the start of operation and operates at a predetermined high speed rotation speed in order to shorten the heating start-up time.
- normal load such as kitchen / wash water supply (about 42 ° C)
- return to medium speed operation after stable operation and relatively high speed operation during hot water storage operation about 65-90 ° C with large heat load. Control.
- the heat pump water heater includes tank thermistors 16a to 16e for detecting the hot water temperature and the amount of hot water stored in the hot water storage tank 16, the ambient temperature thermistor (not shown) for detecting the ambient temperature, and the temperature of the air refrigerant heat exchanger.
- Etc., and each detection signal is input to the operation control means 50.
- the operation control means 50 controls each device based on these signals.
- the hot water supply mixing valve 11 is opened at the beginning of the hot water supply operation so that the water refrigerant heat exchanger 2 side and the hot water mixing valve 12 side, and the hot water storage tank 16 side and the hot water mixing valve 12 side are both open.
- hot water is supplied from both the heat exchanger 2 and the hot water storage tank 16 and the heating temperature in the water refrigerant heat exchanger 2 by the heat pump reaches the hot water supply temperature (about 42 ° C.)
- the hot water tank 16 side and the hot water mixing valve 12 side are connected. Close and supply hot water only from the water-refrigerant heat exchanger 2.
- the hot water on / off valve 28 is provided between the water-refrigerant heat exchanger 2 and the bath heat exchanger 27.
- the hot water on / off valve 28 is opened when the bath is replenished to perform the bath retreat operation, and at other times the water circuit is closed. Thus, heat leakage from the water refrigerant heat exchanger 2 to the bath heat exchanger 27 is prevented. Further, the water supply side check valve 9 allows water to flow only in one direction to prevent backflow.
- FIG. 2 is a flowchart showing a flow of a hot water supply operation when the kitchen faucet is opened and hot water is used in the heat pump water heater according to the embodiment of the present invention.
- the operation control means 50 operates the compressors 1a and 1b and starts the operation of the refrigerant circuit 30 of the heat pump by the detection of the water supply amount sensor 8, and the water supply Metal fitting 6, pressure reducing valve 7, feed water amount sensor 8, feed water side check valve 9, hydrothermal AC amount sensor 10, feed water side heat transfer tubes 2 c and 2 d, hot water mixing valve 11, hot water mixing valve 12, flow rate adjusting valve 13, kitchen
- the direct hot water supply operation is started by the direct hot water supply circuit of the hot metal fitting 14 and the kitchen faucet 15 (step 62).
- the tank hot water supply operation is started by the tank hot water supply circuit (step 63).
- the heat pump refrigerant circuit 30 sends the high-temperature and high-pressure refrigerant compressed by the compressors 1a and 1b to the refrigerant-side heat transfer tubes 2a and 2b of the water-refrigerant heat exchanger 2, and the water flowing in the water-supply-side heat transfer tubes 2c and 2d.
- the refrigerant sent to the water refrigerant heat exchanger 2 is not sufficiently high-temperature and high-pressure and the temperature is low, and the water-refrigerant heat exchanger 2 Since the whole is cold, the heating capacity for heating the water is not sufficient, so a tank hot water supply (step 63) for supplying high-temperature water from the hot water storage tank 16 is required.
- the refrigerant becomes high temperature and pressure, and accordingly, the amount of heat released from the generated refrigerant increases, and the ability to heat water increases.
- the operation control means 50 increases the rotation speed of the compressors 1a and 1b at a higher speed than in the steady state from the start of operation to the arrival of the appropriate temperature state.
- a tank hot water supply operation (step 63) for supplying high-temperature water from the hot water storage tank 16 is performed in parallel, and appropriate hot water is supplied from the kitchen faucet 15. Further, the heating temperature is determined by the heat pump operation (step 64). If the temperature is less than the specified value, the parallel hot water supply and the tank hot water operation are continued. If the specified temperature is exceeded, the tank hot water supply is stopped (step 65). The hot water supply by the single operation is continued (step 66).
- the operation control means 50 operates the hot water supply mixing valve 11 to increase the tank hot water supply amount when the mixed hot water temperature after the hot water supply mixing valve 11 is considerably lower than the appropriate temperature, and to decrease the tank hot water supply amount as the temperature approaches the appropriate temperature. Adjust the flow rate ratio to make it suitable temperature. Furthermore, when the mixed hot water temperature after passing through the hot water mixing valve 11 is higher than the appropriate temperature, the hot water supply temperature to the use terminal can be adjusted also by adjusting the amount of water supplied from the hot water mixing valve 12.
- the role of the hot water storage tank 16 is an auxiliary one at the time of start-up until the heating capacity of the heat pump operation reaches a temperature sufficient for the hot water supply temperature, and the capacity of the heat pump refrigerant circuit 30, particularly the compressors 1a and 1b.
- the capacity of the compressors 1a and 1b is 5 kW which is generally used in a conventional hot water storage system. Although it is desirable to increase it to about 20 kW, the development of a new compressor is necessary, and each part of the heat pump refrigerant circuit 30 needs to be newly studied, which is extremely difficult.
- the two-cycle heat pump system 30a, 30b using two compressors about twice as large as the conventional compressor is used, and the reliability of the conventional technology and the results are ensured, If the capacity of the compressor is sufficient, the application and effect of the present invention will not change even in the one-cycle heat pump system.
- step 66 when the operation start time has passed and direct hot water supply operation is started (step 66), the ambient temperature (outside air temperature), the temperature of the air refrigerant heat exchangers 4a and 4b, and the hot water supply mode (kitchen hot water in FIG. 2) are changed.
- the optimum driving means is determined based on a determination criterion (step 67) as a determination item (step 68).
- the heating efficiency priority operation (step 69) is determined, and when it is determined as the means B, the heating capacity priority operation (step 70) is determined as the means C. If this occurs, the hot water supply operation (step 71) is continued as an intermediate defrost operation (which will be described later, the defrost operation is performed during the hot water supply operation).
- step 72 the hot water supply is stopped directly (step 73), and the frost formation of the air refrigerant heat exchangers 4a and 4b is performed (step 74), and it is determined that the frost is formed.
- the heat pump operation is stopped (step 76), and it is determined that frost is not formed. In this case, the heat pump operation is stopped without performing the defrosting operation (step 76).
- FIG. 3 is a table showing the relationship between the heating capacity and the heating efficiency in a general heat pump water heater.
- FIG. 4 is a table showing determination conditions and determination criteria for determining the optimum operation means in the heat pump water heater according to the present embodiment.
- FIG. 3 shows the relationship between the heating capacity and the heating efficiency during heat pump operation.
- Diagram A shows the case of kitchen hot water supply (about 42 ° C.)
- diagram B shows the tank hot water (hot water supply to the tank. Circuit (1)) (approx. 65 ° C.), and at a constant hot water supply temperature, the heating efficiency decreases as the heating capacity increases. This is because in order to increase the heating capacity, the compressor speed is increased to a higher speed, which increases the mechanical loss of the compressor. Is the same as lowering.
- the diagram A in FIG. 3 shows how to heat to a kitchen hot water supply temperature (about 42 ° C.) at a constant flow rate (for example, 5 L / min) at a constant condition, for example, an ambient temperature of 16 ° C. and a feed water temperature of 17 ° C.
- a minimum heating capacity Amin is required.
- Diagram B shows the case where tank hot water storage operation (operation of the aforementioned hot water storage circuit (1)) is performed under the same conditions as diagram A, and the minimum heating capacity Bmin for heating to the tank hot water temperature (about 65 ° C.).
- the heating efficiency gradually decreases and reaches the maximum heating capacity point Bmax.
- the heating capacity maximum points Amax and Bmax vary depending on the heating capacity of the heat pump, the hot water supply temperature, the hot water supply flow rate, and the like.
- FIG. 4 shows an example of optimum driving means determination criteria.
- three items of ambient temperature (outside air temperature), air refrigerant heat exchanger temperature, and hot water supply mode are provided.
- Ambient temperature is divided into -7 ° C to + 7 ° C, where the temperature is high or the absolute humidity is low and hardly frosts, and + 7 ° C to -7 ° C, and air refrigerant heat exchanger temperature is 0 ° C or more. Divide into less than 0 ° C (if the heat exchanger temperature is 0 ° C or higher, frost is unlikely).
- the hot water supply mode is divided into tank hot water storage, kitchen hot water supply, bath hot water, shower, and hot water supply mode of 60 minutes or more common to each mode.
- the optimum operation means is defined corresponding to the classification of the ambient temperature and the air refrigerant heat exchanger temperature, and by applying these conditions, A (heating efficiency priority) Operation), B (heating capacity priority operation), and C (intermediate defrosting operation) are determined.
- the ambient temperature is divided into two stages, a temperature range where frost formation is not likely to occur and a temperature range where frost formation is likely to occur. For example, it may be divided into a total of three regions, ⁇ 2 ° C. to + 3 ° C., which is most susceptible to frost formation, and a temperature region within the range of ⁇ 7 ° C. to + 7 ° C. outside this region. In the case of ⁇ + 3 ° C., the defrosting may be controlled by further opening the expansion valve.
- the tank hot water storage operation is divided into 150 L, which is estimated based on a distinction of about 60 minutes during high-temperature boiling in winter (approximately 80 ° C. to 90 ° C.). The capacity will be different.
- the reason why the hot water filling and the shower are set to the heating capacity priority B is to shorten the waiting time until bathing and to avoid the shortage of hot water supply at the time of showering.
- the operation efficiency priority A may be determined.
- the optimum operating means A performs operation control mainly giving priority to heating efficiency, and performs the maximum heating efficiency operation targeting Amin and Bmin in FIG.
- the optimum operation means B performs operation control mainly giving priority to the heating capacity, and performs the maximum heating capacity operation targeting Amax and Bmax in FIG.
- the optimum operating means C performs an intermediate defrosting operation (defrosting operation in the middle of a hot water supply operation). This is an optimum operation in the frosting period in consideration of a decrease in heating efficiency due to frosting at low temperatures in winter. This will be described below with reference to FIGS.
- FIG. 5 is a table showing temporal changes in heating capacity when a general heat pump water heater is operated continuously in winter.
- Line A in FIG. 5 shows changes in operating time and heating capacity when continuously operating at low temperatures in winter (ambient temperature of about ⁇ 7 ° C. to + 7 ° C.).
- the air refrigerant heat exchangers 4a and 4b are frosted on the surface, and the heat exchange performance of the air refrigerant heat exchanger is lowered and the heating capacity is lowered after about 30 minutes.
- the heating capacity at the initial stage of operation is set to 100%, it may be reduced to 50% or less after the lapse of about 1 hour, and a defrosting operation is necessary.
- the defrosting operation is performed during the hot water supply operation, the initial heating capacity is restored again, but the defrosting operation stops the hot water supply, requiring power consumption with no hot water supply, leading to a decrease in heating efficiency.
- whether to perform defrosting operation in the middle or whether to continue hot water supply operation with reduced heating capacity without performing defrosting operation depends on usage conditions and hot water supply operation It is a difficult task involving time and complexity.
- the hot water supply mode in which the estimated operation time is 60 minutes or more is, for example, that if it is learned from a daily experience that a hot water supply is 60 minutes or longer in a certain hot water mode, Thus, when the certain hot water supply mode is started, it is estimated that the hot water supply mode is 60 minutes or longer due to the learning effect.
- FIG. 6 is an explanatory diagram showing a comparison of the heating amount between the continuous operation and the intermediate defrosting operation when the estimated hot water supply time is long in winter in the heat pump water heater according to the present embodiment.
- FIG. 6 shows a change in the heating capacity when the estimated hot water supply time is about 70 minutes.
- the heating capacity changes as shown by line A1, and the total heating amount of the lower area of the line A1 is 70 minutes. It becomes.
- the estimated hot water supply time is 60 minutes or more, it is determined as an intermediate defrosting operation, and the defrosting operation is performed after about 30 minutes at the time of about 1 ⁇ 2 as shown by the broken lines of lines B1 and B2.
- the lower area of the lines B1 and B2 is the total heating amount for 70 minutes.
- the total heating amount for 70 minutes is compared, as is clear from FIG.
- the heating amount decrease E due to frost formation during continuous hot water supply operation (the amount obtained by subtracting the solid line portion of A1 from the broken line of B2) Since there is less heating amount decrease D due to the defrosting operation (the amount of heating lost in the defrosting operation after 30 minutes), the intermediate defrosting operation (B1 and B2) is the continuous operation ( The amount of heating is larger than in A1), and the heating efficiency is good as a whole of the operation.
- FIG. 7 is an explanatory diagram showing a comparison of heating amounts between the continuous operation and the intermediate defrosting operation when the estimated hot water supply time is short in winter in the heat pump water heater according to the present embodiment.
- the estimated hot water supply time is 50 minutes
- the heating capacity decrease E decreases as the time is short
- the heating amount decrease D due to defrosting decreases when the defrost operation is performed in the middle. Therefore, the total heating amount by the continuous operation represented by the lower area of the line A2 is larger than the total heating amount by the intermediate defrosting operation represented by the lower area of the lines C1 and C2, and the continuous operation is more intermediate defrosting. Heating efficiency is better than operation.
- the feature of the embodiment of the present invention is that the optimum operation means is determined based on the ambient temperature, the air refrigerant heat exchanger temperature, and the hot water supply mode as the determination criteria, and the heating efficiency priority operation and the heating capacity priority are based on the determination.
- the optimum operation means is selected from the operation and the intermediate defrosting operation, and the optimum operation control is performed comprehensively to ensure the necessary heating capacity, improve the heating efficiency, and save energy.
- the specific configuration of the features includes a compressor, a water refrigerant heat exchanger that performs heat exchange between water and refrigerant, an expansion valve, and an air refrigerant heat exchanger that performs heat exchange between air and refrigerant via a refrigerant pipe.
- the heat pump refrigerant circuit sequentially connected to the water refrigerant heat exchanger, the hot water supply mixing valve, the hot water storage tank for storing hot water heated by the water refrigerant heat exchanger, the in-machine circulation pump, and these components are connected to each other.
- Hot water storage circuit consisting of water piping, water supply fitting, hot water storage tank, hot water supply mixing valve, hot water mixing valve, flow rate adjustment valve, outlet metal fitting, and tank hot water supply circuit consisting of water piping connecting these components, and the compressor
- Hot water supply mode Optimal operation means is determined based on the determination criteria of the optimum operation means, and at least three types of operation means of heating efficiency priority operation, heating capacity priority operation, and intermediate defrost operation are provided as the optimum operation means. It is what has.
- the operation control means of this embodiment performs the intermediate defrosting operation when the hot water supply time is longer and the intermediate defrosting operation is more efficient due to the estimated hot water supply time, and the hot water supply time is shorter and continuously operated.
- the continuous operation is performed when the efficiency is high, and the optimal operation in the frosting period can be performed.
- the operation control means of this embodiment is a heating efficiency priority operation, a heating capacity priority operation, and an optimum operation means determination standard based on the ambient temperature (outside air temperature), the air refrigerant heat exchanger temperature, and the hot water supply mode, and The intermediate defrosting operation is determined and the optimum operation means is selected.
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Abstract
Description
冷媒を圧縮する圧縮機、水と冷媒との熱交換を行なう水冷媒熱交換器、膨張弁、空気と冷媒との熱交換を行なう空気冷媒熱交換器、冷媒配管、を有するヒートポンプ冷媒回路と、前記水冷媒熱交換器で加熱した温水を貯めて置く貯湯タンク、機内循環ポンプ、給湯混合弁、前記水冷媒熱交換器で加熱した温水との熱交換を行う風呂用熱交換器、風呂循環用ポンプ、湯水混合弁、水配管、を有して、前記貯湯タンクに高温水を貯める貯湯回路、前記水冷媒熱交換器で加熱した温水を出湯箇所に直接給湯する直接給湯回路、前記貯湯タンクからの温水を出湯箇所に給湯するタンク給湯回路、前記水冷媒熱交換器で加熱した温水を前記風呂循環用ポンプで風呂に給湯する風呂湯張り回路、前記風呂用熱交換器からの温水を前記風呂循環用ポンプで風呂に給湯する風呂追焚回路、を形成する給湯回路と、出湯箇所リモコンと風呂リモコンの操作設定で、各構成要素を制御して貯湯運転、直接給湯運転、タンク給湯運転、風呂湯張り運転、風呂追焚運転を行う運転制御部と、を備えたヒートポンプ給湯機であって、前記運転制御部は、ヒートポンプ給湯機の周囲温度と、前記空気冷媒熱交換器の温度と、及びタンクへの貯湯、出湯箇所への給湯、風呂湯張り、所定時間以上の運転での給湯、を含む給湯・貯湯モードと、を判定基準として、加熱効率優先運転、加熱能力優先運転、中間除霜運転、の3種類の運転手段のいずれかを判定する最適運転制御を行う構成である。 In order to solve the above problems, the present invention mainly adopts the following configuration.
A heat pump refrigerant circuit having a compressor for compressing refrigerant, a water refrigerant heat exchanger for exchanging heat between water and refrigerant, an expansion valve, an air refrigerant heat exchanger for exchanging heat between air and refrigerant, and a refrigerant pipe; Hot water storage tank for storing hot water heated by the water refrigerant heat exchanger, in-machine circulation pump, hot water mixing valve, bath heat exchanger for exchanging heat with hot water heated by the water refrigerant heat exchanger, for bath circulation A hot water storage circuit for storing hot water in the hot water storage tank, a direct hot water supply circuit for directly supplying hot water heated by the water refrigerant heat exchanger to a hot water outlet, A hot water supply circuit for supplying hot water to a hot water outlet, a hot water heating circuit for supplying hot water heated by the water-refrigerant heat exchanger to the bath with the pump for circulating the bath, and hot water from the heat exchanger for bath to the bath Wind with circulation pump Hot water supply circuit to form a hot water supply circuit, and hot water storage operation, direct hot water supply operation, tank hot water operation, bath hot water operation, bath An operation control unit that performs a memorial operation, wherein the operation control unit includes an ambient temperature of the heat pump water heater, a temperature of the air refrigerant heat exchanger, and hot water storage in a tank, Three types of heating efficiency priority operation, heating capacity priority operation, and intermediate defrosting operation are used as criteria for determining hot water and hot water storage modes, including hot water supply to hot water outlets, bath hot water filling, and hot water supply for operation over a predetermined time. It is the structure which performs the optimal driving | operation control which determines either of the driving | operation means.
本発明の他の目的、特徴及び利点は添付図面に関する以下の本発明の実施例の記載から明らかになるであろう。 In addition, frost formation at the end of operation is detected, and only when there is frost, the defrost operation is performed and then the operation is stopped. The rise characteristics can be improved, and frost formation at the end of operation can be prevented from increasing during the stop period under conditions such as low outside air temperature or snowfall.
Other objects, features and advantages of the present invention will become apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.
上記記載は実施例についてなされたが、本発明はそれに限らず、本発明の精神と添付の請求の範囲の範囲内で種々の変更および修正をすることができることは当業者に明らかである。 Thus, the operation control means of this embodiment performs the intermediate defrosting operation when the hot water supply time is longer and the intermediate defrosting operation is more efficient due to the estimated hot water supply time, and the hot water supply time is shorter and continuously operated. However, one of the specific features is that the continuous operation is performed when the efficiency is high, and the optimal operation in the frosting period can be performed. And the operation control means of this embodiment is a heating efficiency priority operation, a heating capacity priority operation, and an optimum operation means determination standard based on the ambient temperature (outside air temperature), the air refrigerant heat exchanger temperature, and the hot water supply mode, and The intermediate defrosting operation is determined and the optimum operation means is selected. In this embodiment, the case where the present invention is applied to an instantaneous heat pump water heater that performs a direct hot water supply operation has been described. When the tank capacity is large and the hot water storage amount is changed daily by learning control, the same effect as that of the instantaneous type can be obtained by applying this embodiment.
While the above description has been made with reference to exemplary embodiments, it will be apparent to those skilled in the art that the invention is not limited thereto and that various changes and modifications can be made within the spirit of the invention and the scope of the appended claims.
Claims (7)
- 冷媒を圧縮する圧縮機、水と冷媒との熱交換を行なう水冷媒熱交換器、膨張弁、空気と冷媒との熱交換を行なう空気冷媒熱交換器、冷媒配管、を有するヒートポンプ冷媒回路と、
前記水冷媒熱交換器で加熱した温水を貯めて置く貯湯タンク、機内循環ポンプ、給湯混合弁、前記水冷媒熱交換器で加熱した温水との熱交換を行う風呂用熱交換器、風呂循環用ポンプ、湯水混合弁、水配管、を有して、前記貯湯タンクに高温水を貯める貯湯回路、前記水冷媒熱交換器で加熱した温水を出湯箇所に直接給湯する直接給湯回路、前記貯湯タンクからの温水を出湯箇所に給湯するタンク給湯回路、前記水冷媒熱交換器で加熱した温水を前記風呂循環用ポンプで風呂に給湯する風呂湯張り回路、前記風呂用熱交換器からの温水を前記風呂循環用ポンプで風呂に給湯する風呂追焚回路、を形成する給湯回路と、
出湯箇所リモコンと風呂リモコンの操作設定で、各構成要素を制御して貯湯運転、直接給湯運転、タンク給湯運転、風呂湯張り運転、風呂追焚運転を行う運転制御部と、を備えたヒートポンプ給湯機であって、
前記運転制御部は、ヒートポンプ給湯機の周囲温度と、前記空気冷媒熱交換器の温度と、及びタンクへの貯湯、出湯箇所への給湯、風呂湯張り、所定時間以上の運転での給湯、を含む給湯・貯湯モードと、を判定基準として、加熱効率優先運転、加熱能力優先運転、中間除霜運転、の3種類の運転手段のいずれかを判定する最適運転制御を行う
ことを特徴とするヒートポンプ給湯機。 A heat pump refrigerant circuit having a compressor for compressing refrigerant, a water refrigerant heat exchanger for exchanging heat between water and refrigerant, an expansion valve, an air refrigerant heat exchanger for exchanging heat between air and refrigerant, and a refrigerant pipe;
Hot water storage tank for storing hot water heated by the water refrigerant heat exchanger, in-machine circulation pump, hot water mixing valve, bath heat exchanger for exchanging heat with hot water heated by the water refrigerant heat exchanger, for bath circulation A hot water storage circuit for storing hot water in the hot water storage tank, a direct hot water supply circuit for directly supplying hot water heated by the water refrigerant heat exchanger to a hot water outlet, A hot water supply circuit for supplying hot water to a hot water outlet, a hot water heating circuit for supplying hot water heated by the water-refrigerant heat exchanger to the bath using the pump for circulating the bath, and hot water from the heat exchanger for bathing to the bath A hot water supply circuit forming a bath memorial circuit for supplying hot water to the bath with a circulation pump;
A heat pump hot water supply comprising an operation control unit for controlling hot water storage operation, direct hot water supply operation, tank hot water supply operation, bath hot water operation, and bath memorial operation by controlling each component by operating settings of the hot water remote control and bath remote control Machine,
The operation control unit includes an ambient temperature of the heat pump water heater, a temperature of the air refrigerant heat exchanger, hot water storage in a tank, hot water supply to a hot water outlet, bath hot water filling, hot water supply in operation for a predetermined time or more. A heat pump that performs optimum operation control to determine one of three types of operation means: heating efficiency priority operation, heating capacity priority operation, and intermediate defrosting operation, using the hot water supply / storage mode including Water heater. - 請求項1において、
前記運転制御部は、前記加熱効率優先運転と判定した場合は加熱効率が最大となるような圧縮機回転数で運転し、前記加熱能力優先運転と判定した場合は加熱能力が最大となるような圧縮機回転数で運転し、前記中間除霜運転と判定した場合は加熱能力が最大となるような圧縮機回転数で運転し且つ推定されるヒートポンプ運転時間の約1/2の時間経過後に除霜運転を行なうことを特徴とするヒートポンプ給湯機。 In claim 1,
The operation control unit operates at a compressor rotation speed that maximizes the heating efficiency when it is determined as the heating efficiency priority operation, and the heating capacity is maximized when it is determined as the heating capacity priority operation. If the operation is performed at the compressor speed and the intermediate defrosting operation is determined, the operation is performed at the compressor speed at which the heating capacity is maximized, and the removal is performed after about half of the estimated heat pump operation time. A heat pump water heater characterized by performing frost operation. - 請求項1において、
前記運転制御部は、前記判定基準として、前記周囲温度を約+7℃以上または約-7℃以下と、約-7℃~+7℃の少なくとも2つ以上に区分することを特徴とするヒートポンプ給湯機。 In claim 1,
The operation control unit divides the ambient temperature into at least two of about + 7 ° C. or more and about −7 ° C. or less and about −7 ° C. to + 7 ° C. as the determination criterion. . - 請求項1において、
前記運転制御部は、前記判定基準として、前記空気冷媒熱交換器温度を約0℃以上と約0℃未満の2つに区分することを特徴とするヒートポンプ給湯機。 In claim 1,
The operation control unit divides the air refrigerant heat exchanger temperature into two, that is, about 0 ° C. or more and less than about 0 ° C. as the determination criterion. - 請求項1において、
前記運転制御部は、前記判定基準として、給湯モード毎にヒートポンプ運転時間を学習し、推定運転時間が約60分以上の給湯モードの場合、最適運転制御として中間除霜運転と判定することを特徴とするヒートポンプ給湯機。 In claim 1,
The operation control unit learns the heat pump operation time for each hot water supply mode as the determination criterion, and determines the intermediate defrost operation as the optimum operation control in the hot water supply mode with an estimated operation time of about 60 minutes or more. Heat pump water heater. - 請求項1ないし5のいずれか1つの請求項において、
前記運転制御部は、ヒートポンプ運転による加熱運転終了後に前記空気冷媒熱交換器の着霜判定を行ない、
着霜していると判定した場合は除霜運転を行なってからヒートポンプ運転を停止し、着霜していないと判定した場合は除霜運転を行なわずにヒートポンプ運転を停止することを特徴とするヒートポンプ給湯機。 In any one of claims 1-5,
The operation control unit performs frosting determination of the air refrigerant heat exchanger after completion of the heating operation by the heat pump operation,
When it is determined that frost formation is performed, the heat pump operation is stopped after performing the defrost operation, and when it is determined that frost formation is not performed, the heat pump operation is stopped without performing the defrost operation. Heat pump water heater. - 請求項1ないし5のいずれか1つの請求項において、
前記ヒートポンプ冷媒回路は、前記圧縮機、前記水冷媒熱交換器、前記膨張弁、前記空気冷媒熱交換器、前記冷媒配管をそれぞれ2個使用する2サイクルヒートポンプ冷媒回路であることを特徴とするヒートポンプ給湯機。 In any one of claims 1-5,
The heat pump refrigerant circuit is a two-cycle heat pump refrigerant circuit using two each of the compressor, the water refrigerant heat exchanger, the expansion valve, the air refrigerant heat exchanger, and the refrigerant pipe. Water heater.
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US9863680B2 (en) * | 2013-06-20 | 2018-01-09 | Mitsubishi Electric Corporation | Heat pump apparatus |
CN105650855B (en) * | 2016-03-26 | 2019-06-07 | 广东万家乐燃气具有限公司 | A kind of gas heater and its control method with reservation function |
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JP2003222392A (en) * | 2002-01-29 | 2003-08-08 | Daikin Ind Ltd | Heat pump type water heater |
JP2005121283A (en) * | 2003-10-16 | 2005-05-12 | Matsushita Electric Ind Co Ltd | Heat pump water heater |
JP2006266591A (en) * | 2005-03-24 | 2006-10-05 | Hitachi Home & Life Solutions Inc | Heat pump water heater |
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KR101222300B1 (en) | 2013-01-16 |
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