JP4159975B2 - Energy storage type heat pump water heater - Google Patents

Energy storage type heat pump water heater Download PDF

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JP4159975B2
JP4159975B2 JP2003403466A JP2003403466A JP4159975B2 JP 4159975 B2 JP4159975 B2 JP 4159975B2 JP 2003403466 A JP2003403466 A JP 2003403466A JP 2003403466 A JP2003403466 A JP 2003403466A JP 4159975 B2 JP4159975 B2 JP 4159975B2
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evaporator
heat
storage
heat pump
refrigerant
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JP2005164124A (en
JP2005164124A5 (en
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徹生 寺島
芳雄 盛田
基啓 鈴木
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松下電器産業株式会社
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  The present invention relates to a heat pump water heater that has been put into practical use in recent years. For example, the present invention relates to a heat pump water heater equipped with a heat storage tank using a hot water storage tank.
  Conventional heat pump water heaters have the same capacity as electric water heaters because the heating capacity of the heat pump cycle is less than the hot water supply output, and the use of inexpensive late-night electricity set by electric power companies for power load leveling. Similarly, it has a hot water storage (heat storage type) configuration having a heat storage tank with a hot water storage tank (see, for example, Patent Document 1 and Patent Document 2).
  In FIG. 8, the block diagram of this conventional heat pump water heater is shown.
  The tap water flowing through the water flow path 6 flows into the hot water storage tank 8 from the water injection section 11 and flows out of the water discharge section 12 via the lower part in the hot water storage tank 8. In the heat pump cycle having the evaporator 1, the compressor 2, the condenser 3, the expansion valve 4, and the refrigerant flow path 5 as main components, the high-pressure refrigerant generated in the refrigerant flow path 5 after the compressor 2 is By radiating heat, the tap water discharged from the water outlet 12 is turned into hot water. Thereafter, the hot water is introduced into the hot water storage tank 8 from the pouring section 7 and stored therein.
The size of the hot water storage tank 8 is normally required to be about 370 to 460 L in a standard general household, and it has been desired that the hot water storage tank 8 be formed more compact in consideration of housing conditions in urban areas. For such requirements, miniaturized hot water storage tank back and forth 200L, the control, such as when insufficient supply from the hot water storage tank against hot water demand continues to reheating at any time by utilizing the daytime power A method to deal with it has been put into practical use.
  In addition, a method for forming a heat storage unit using a latent heat storage material instead of a hot water storage tank has been studied. FIG. 9 shows a configuration diagram of a heat storage type heat pump water heater using a latent heat storage material.
In FIG. 9, the heat storage unit 15 is filled with a latent heat storage material (for example, refer to Non-Patent Document 1) such as paraffins such as sodium acetate trihydrate (melting point: 58 ° C.) and n-Octocosane (melting point: 61 ° C.). The latent heat storage material is heated by exchanging heat with the condenser 3 and stored using the phase change heat and sensible heat at that time. The tap water entering the heat storage unit 15 from the water injection unit 11 is heated by exchanging heat with the latent heat storage material while passing through the heat exchanger 14, and the temperature is adjusted by the mixing plug 10 via the hot water supply unit 9. Used for hot water supply.
JP 2002-81768 A JP 2003-139391 A The Society of Chemical Engineers, "Heat Storage Technology-Theory and Its Applications, Part II", Shinzansha Cytec, August 30, 2001
  However, in order to reduce the size of the hot water storage tank, if the method of chasing the shortage by using daytime power as in the conventional case is used, if the number of families is large and the demand for hot water supply is large, there is a time zone for chasing. Become more. Therefore, there is a problem that the running cost is increased because expensive daytime power is used for a heat pump water heater having a large hot water storage tank in which inexpensive late-night power is mainly used.
  In order to solve this problem, it is conceivable to use a heat storage tank using a latent heat storage material that can be expected to have a heat storage density that is about twice that of hot water so as to store heat using midnight power as much as possible. However, in this case, for example, if all of the hot water supply equivalent to about 460 L of hot water storage tank (about 140,000 kJ) is stored, the required latent heat storage material becomes several hundred kg or more, and in terms of weight However, there were problems such as problems in installation characteristics.
SUMMARY OF THE INVENTION An object of the present invention is to provide an energy storage type heat pump water heater that is economical and compact while sufficiently utilizing inexpensive electric power such as late-night hours.
In order to solve the above-described problem, the first aspect of the present invention provides:
A heat pump cycle having a compressor, a first radiator, an expansion valve, and an evaporator;
Power storage means for storing system power;
A hot water storage tank for storing hot water heated using the heat of the first radiator,
The compressor is operated by at least the electric power of the power storage means,
The evaporator is composed of two parts, a first evaporator and a second evaporator, and the first evaporator, the first evaporator from the expansion valve side to the side from which the refrigerant flows out from the expansion valve. Are arranged in the order of 2 evaporators,
The second evaporator is an energy storage type heat pump water heater in which at least a part thereof is in thermal contact with the power storage means .
The second aspect of the present invention
Furthermore, between the first evaporator and the compressor, a bypass channel through which a refrigerant can flow without passing through the second evaporator,
A refrigerant flow rate adjusting means capable of adjusting the flow rate of the refrigerant flowing out of the first evaporator and the flow rate of flowing through the second evaporator and the flow rate of flowing through the bypass channel;
The energy storage type heat pump according to the first aspect of the present invention, wherein the refrigerant flow rate adjusting means controls the refrigerant to flow through the bypass flow path when the power storage means causes an endothermic chemical reaction accompanying a charge or discharge reaction. It is a water heater.
The third aspect of the present invention provides
Temperature detecting means for detecting the temperature of the power storage means,
The refrigerant flow rate adjusting means adjusts the flow rate of the refrigerant flowing through the second evaporator and the flow rate of the refrigerant flowing through the bypass flow path so that the temperature of the power storage means becomes a predetermined level. It is an energy storage type heat pump water heater of the present invention .
The fourth invention relates to
A heat pump cycle having a compressor, a first radiator, an expansion valve, and an evaporator;
Power storage means for storing system power;
A first heat storage unit that is in thermal contact with the first radiator and heats hot water by stored heat;
The compressor is operated by at least the electric power of the power storage means,
The evaporator is composed of two parts, a first evaporator and a second evaporator, and the first evaporator, the first evaporator from the expansion valve side to the side from which the refrigerant flows out from the expansion valve. Are arranged in the order of 2 evaporators,
The second evaporator is an energy storage type heat pump water heater in which at least a part thereof is in thermal contact with the power storage means.
The fifth aspect of the present invention relates to
Furthermore, between the first evaporator and the compressor, a bypass channel through which a refrigerant can flow without passing through the second evaporator,
A refrigerant flow rate adjusting means capable of adjusting the flow rate of the refrigerant flowing out of the first evaporator and the flow rate of flowing through the second evaporator and the flow rate of flowing through the bypass channel;
The energy storage type heat pump according to the fourth aspect of the present invention, wherein the refrigerant flow rate adjusting means controls the refrigerant to flow through the bypass flow path when the power storage means causes an endothermic chemical reaction accompanying charging or discharging reaction. It is a water heater.
The sixth invention relates to
Temperature detecting means for detecting the temperature of the power storage means,
The refrigerant flow rate adjusting means adjusts the flow rate of the refrigerant flowing through the second evaporator and the flow rate of the refrigerant flowing through the bypass flow path so that the temperature of the power storage means becomes a predetermined level. It is an energy storage type heat pump water heater of the present invention.
According to the present invention, it is possible to provide an economical and compact energy storage type heat pump water heater while sufficiently using inexpensive electric power such as late-night time.
Embodiments of the present invention and reference examples that are techniques related to the present invention will be specifically described below with reference to the drawings.
( Reference Example 1)
FIG. 1 is a schematic configuration diagram of an energy storage type heat pump water heater in Reference Example 1. A basic configuration of an energy storage type heat pump water heater of Reference Example 1 will be described with reference to FIG.
  The evaporator 16, the compressor 17, the condenser 18, the expansion valve 19, and the refrigerant flow path 20 constitute a heat pump cycle. A storage battery 22 is also connected to the compressor 17 via an inverter 29 in addition to the system power supply. The storage battery 22 can be charged from the system power supply via the AC-DC converter 21. The condenser 18 is an example of the first radiator of the present invention. The storage battery 22 is an example of the power storage means of the present invention.
Further, in the present heat pump cycle, CO 2 is used as a refrigerant, and heating up to about 110 ° C. can be performed with high efficiency of COP 3 or more. The hot water storage tank 23 is provided with a temperature sensor 28 for detecting the temperature of the water stored in the hot water storage tank 23 in a specific water level direction of the hot water storage tank 23. Note that the basic configuration and operation of the hot water storage tank 23 are the same as those in the prior art. The temperature sensor 28 is an example of the first temperature detection means of the present invention.
  In addition, the control part with respect to each part is not illustrated in FIG. Moreover, the same code | symbol is used about the same component as the conventional heat pump water heater shown in FIG.
Next, the operation and operation method of the energy storage type heat pump water heater of Reference Example 1 will be described.
  In FIG. 1, a hot water storage tank 23 stores heat generated by operating a heat pump cycle in the midnight time zone using midnight power (system power supply). When there is a demand for hot water supply, the hot water is directly discharged from the hot water discharge section 9 of the hot water storage tank 23, mixed with tap water flowing through the water flow path 6 by the mixing plug 24, and hot water having a predetermined temperature is distributed to the hot water supply path 13. Let Note that the midnight power shown here is an example of the system power in a specific time zone of the present invention.
  On the other hand, the storage battery 22 is composed of a Ni hydrogen battery, and stores inexpensive midnight power from the system power supply. Then, the power stored in the storage battery 22 is used for the operation of the compressor 17 and the heat pump cycle is operated to cause the condenser 18 to generate heat and heat the water in the hot water storage tank 23.
  As described above, heat storage in the hot water storage tank 23 and power storage in the storage battery 22 are performed by the operation of the heat pump cycle in a time zone in which inexpensive midnight power can be used.
  With the above basic configuration, when the amount of heat in the hot water storage tank 23 is utilized by hot water supply during the daytime, the power stored in the storage battery 22 is used to heat the water in the hot water storage tank 23 by operating the heat pump cycle. be able to. Therefore, in the hot water storage tank 23, it is not necessary to boil all the hot water necessary for hot water supply at midnight.
  Specifically, for example, when the water temperature in the hot water storage tank 23 detected by the temperature sensor 28 is equal to or lower than a predetermined temperature (60 to 45 ° C.) that is less than the hot water supply temperature, the power from the storage battery 22 is used. The heat pump cycle is activated to replenish the water in the hot water storage tank 23. In this way, since daytime power is not used for reheating, it is possible to suppress the disadvantage that the running cost, which is a problem of a conventional heat pump water heater that uses daytime power, increases. it can. In addition, when the hot water storage tank 23 is replenished, it is preferable that the compressor 17 is operated at a rated operation (operation with the highest efficiency design value).
  Moreover, if the heat pump cycle is operated in the middle of the night as in the prior art, not all the heat obtained by the hot water storage tank 23 is stored in the storage battery 22 in the state of energy before being pumped up by the heat pump. Because it is good, the amount of energy stored is also reduced.
By using the energy storage type heat pump water heater having the configuration of Reference Example 1 as described above, it is possible to save space.
As in the past, when storing a heat amount equivalent to 140,000 kJ only with a hot water storage tank at a maximum of 90 ° C., an internal volume of 460 L (external volume of about 920 L) was required, whereas for example, with a hot water storage tank 23 By storing a storage amount of 23,000 kJ for heating up to 75,000 kJ and 62,000 kJ in the storage battery 22, that is, COP = 3 conversion , the hot water storage tank 23 has an internal volume of 240L (outer capacity of about 480L), and the storage battery 22 has, for example, a Panasonic EV Energy It becomes 54 L with a Ni hydrogen battery (EV28) manufactured. That is, as compared with the case of a heat pump water heater which savings built the heat only conventional hot water storage tank, it is possible to space saving of about 2/3.
  Here, if the hot water storage tank 23 is extremely small and the amount of electricity stored in the storage battery 22 is increased, when there is a continuous demand for a large amount of hot water as in the case of bath hot water, the hot water storage tank 23 The amount of hot water supply is often insufficient. The shortage needs to be instantly created from the storage battery 22, but the compressor 17 is used for the evaporator 16 in order to increase the size of the compressor 17 more than necessary and to instantaneously absorb heat from the atmosphere. There arises a problem that the refrigerant-atmospheric heat exchanger becomes large. Therefore, the amount of heat stored in the heat storage tank such as the hot water storage tank 23 has an amount of heat that is equal to or greater than that of a hot water storage tank that is required for hot water filling in a bath that requires a large amount of hot water (for example, 200 L at 40 ° C.). It is preferable.
In Reference Example 1 shown in FIG. 1, the storage battery 22 is configured to store electricity from the system power supply, but of course, the electricity generated by the solar cell, wind power generator, or the like is stored in the compressor 17. You may use for operation.
Moreover, in the reference example 1, although the Ni hydrogen battery is used for the storage battery 22, it can be used according to conditions, such as a Li secondary battery and an inexpensive seal-type lead storage battery. In addition, system power may be mainly used for the compressors 17 other than the compressor 17 that uses power (for example, a fan for an evaporator, a control unit, etc.).
  Moreover, it is also possible to give the capacity | capacitance of the storage battery 22 and to use for the electric power of the heat retention heater (not shown) of the hot water storage tank 23. FIG.
( Reference Example 2)
FIG. 2 is a schematic configuration diagram of an energy storage type heat pump water heater in Reference Example 2. The configuration of the energy storage type heat pump water heater in Reference Example 2 will be described with reference to FIG. In addition, the same code | symbol as FIG. 1 is used about the same component as the energy storage type heat pump water heater of the reference example 1 shown in FIG.
The heat storage type heat pump water heater of the reference example 2 is different from the reference example 1 in that the heat storage tank 27 is used in the reference example 1 as the heat storage device, whereas the heat storage unit 27 is used.
  The heat storage unit 27 is filled with strontium hydroxide octahydrate (melting point: 88 ° C., heat of fusion: 343 kJ / kg), which is a latent heat storage material. By using the latent heat storage material, it is possible to configure the heat storage density (heat storage amount per unit volume) by about twice, and the heat storage section 27 is further reduced to about 1/2 of the hot water storage tank 23. It becomes possible to do. In addition, the heat storage part 27 is an example of the 1st heat storage part of this invention.
Next, the operation and operation method of the energy storage type heat pump water heater of Reference Example 2 will be described.
The heat storage unit 27 is heated from the middle to the lower side by the condenser 18 constituting the heat pump cycle, and, similarly to the case of the reference example 1, by operating the heat pump cycle using cheap midnight power. It is heated to a predetermined temperature and stores the amount of heat.
  The tap water flowing through the water flow path 32 flows into the heat storage unit 27 from the water injection unit 26 and flows from the lower side to the upper side of the heat storage unit 27. In this process, the latent heat storage in the heat storage unit 27 is performed. The material and the heat storage unit-water heat exchanger 30 are heated up to the hot water temperature range while exchanging heat. Hot water generated by heating in the heat storage unit 27 is mixed with tap water in the water flow path 32 by the mixing plug 24, flows out into the hot water supply path 31, and is used for hot water supply.
  In addition, the heat storage part 27 is not provided with the heat storage part-water heat exchanger 30, the latent heat storage material is enclosed in a capsule and filled in the heat storage part 27, and tap water is directly circulated from the water injection part 26 to the heat storage part 27. It is also possible to perform heat exchange. In addition, as a form of the heat storage part 27, other known forms that meet the object of the present invention, for example, a generally used shell type may be used.
Here, when the amount of heat of the heat storage unit 27 is used for heating the tap water, the temperature level of the latent heat storage material in the middle of the tank of the heat storage unit 27 and the effect thereof is lowered. When the temperature sensor 28 detects the decrease in the temperature level, the heat pump cycle is activated using the electric power stored in the storage battery 22 as in the case of the reference example 1, and the condenser 18 provided in the heat storage unit 27 is used. The amount of heat that is insufficient in the heat storage unit 27 is compensated. The temperature sensor 28 is an example of means for detecting the amount of residual heat in the heat storage unit of the present invention. Moreover, said temperature level is an example of the predetermined value of the amount of residual heat of this invention.
In this way, since the expensive daytime power is not used, it is possible to suppress the disadvantages of the conventional system that uses the daytime power that increases the running cost. At the same time, by reducing the amount of use of the latent heat storage material, problems such as weight restrictions on installation work are solved, and the heat storage unit can be further reduced in size than in Reference Example 1. For Example 2, the volume of the heat storage section 27, to become about half of the hot water storage tank of Example 1, as compared with the case of the hot water storage tank 23 in Example 1, the heat storage unit 27 to approximately 1/3 the size of the The volume of can be reduced.
In Reference Example 2, strontium hydroxide is used as the latent heat storage material, but the hot water supply temperature and the range in which the reliability of components such as a heat pump cycle or a motor is sufficiently satisfied (about 45 ° C. to 110 ° C.) Any material having a phase change temperature can be used. For example, sodium acetate trihydrate or a mixture thereof, magnesium nitrate or a mixture thereof, paraffins, fatty acids, and the like can be used, but in order to further reduce the size, it is preferable to use an inorganic compound having a high density.
( Reference Example 3)
FIG. 3 is a schematic configuration diagram of an energy storage type heat pump water heater in Reference Example 3. The basic configuration of the energy storage type heat pump water heater in Reference Example 3 will be described with reference to FIG.
The energy storage type heat pump water heater in Reference Example 3 uses the power of the storage battery 22 that stores midnight power, operates the compressor 17 of the heat pump cycle at daytime, and directly heats tap water with the condenser 18. It differs from the cases of Reference Example 1 and Reference Example 2 in that the hot water is discharged.
On the other hand, the heat storage unit 27 is the same as the reference example 2 filled with the latent heat storage material, and the heat obtained by operating the heat pump cycle with the electric power in the late-night time is supplied to the second condenser 34. The heat is stored by exchanging heat with the latent heat storage material. Here, in FIG. 3, the heat storage unit 27 made of a latent heat storage material is used, but instead of the heat storage unit 27, a hot water storage tank may be used in the same manner as in Reference Example 1. The condenser 18 and the second condenser 34 are examples of the second radiator and the first radiator of the present invention.
  The refrigerant flow path 20 is provided with a control valve 35 that adjusts the amount of refrigerant that is circulated through the condenser 18 and a control valve 36 that adjusts the amount of refrigerant that is circulated through the second condenser 34. In addition, a temperature sensor 33 that detects the temperature of the water flowing through the water flow path is provided on the downstream side of the water flow path that contacts the condenser 18.
Next, the operation and operation method of the energy storage type heat pump water heater of Reference Example 3 will be described.
In general, in the input-output relationship in the compressor 17, there is a rated operating condition for obtaining an optimum COP according to the design value. In Reference Example 3, when the compressor 17 is operated using the electric power stored in the storage battery 22, a high COP is obtained by operating the compressor 17 under this rated condition. And when hot water supply load is large, a control part (not shown) controls so that the opening degree of the control valve 36 may become large, and respond | corresponds to hot water supply demand by supplying the heat quantity of the heat storage part 27 additionally. Is possible.
  In addition, when the compressor 17 reaches a steady state, the water that is heat-exchanged by the condenser 18 and flows out to the hot water supply passage 31 takes about several minutes to reach a predetermined hot water supply temperature. Therefore, the time until the water temperature of the output hot water is stabilized is, for example, the hot water supplied from the heat storage unit 27 according to the water temperature detected by the temperature sensor 33 provided on the downstream side of the water flow path in contact with the condenser 18. The ratio of the opening degree of the control valve 35 and the opening degree of the control valve 36 is controlled so as to increase the output amount, the amount of refrigerant flowing through the condenser 18 and the second condenser 34 is adjusted, and the hot water is discharged from the heat storage unit 27. By adjusting the amount of hot water to be used, the predetermined temperature can be obtained more quickly than when heating only by the heat pump cycle.
The control for directly heating the water in the water flow path 32 in the heat pump cycle as in Reference Example 3 is effective particularly when the hot water supply is continued for a long time, such as in the case of bath hot water supply. It is preferable that the tap water is heated only by the heat of the heat storage unit 27. In the case of bath hot water supply, a signal indicating the demand is sent from a controller (not shown) or the like to the control unit, so that the operation mainly performed by the heat pump cycle and the operation mainly performed by the heat storage unit 27 can be separated. At this time, when the temperature sensor 28 detects that the amount of heat stored in the heat storage section 27 has become a certain value or less, the heat pump cycle is activated, the control valve 36 is opened, and the heat storage section 27 is reheated and heated by the bypass 37. The predetermined amount of heat storage can be held.
  Contrary to the above, when the heat output produced by the heat pump cycle is larger than the demand, it is possible to store the excess amount of heat in the heat storage unit 27 by narrowing the control valve 35.
By adopting the configuration as in Reference Example 3 as described above, it is possible to realize a heat pump water heater that is energy-saving and excellent in compactness while obtaining heat more economically.
As described above, by using the energy storage type heat pump water heater of Reference Example 3, the midnight power stored in the storage battery activates the heat pump cycle at the rated value, and only the insufficient amount of heat is supplied from the heat storage unit. Therefore, a low running cost can be realized while reducing the volume of the heat storage unit.
In the configurations described in Reference Examples 1 to 3, the storage battery 22 is used as the power storage means. However, in order to achieve the effects of the present invention, another operating principle such as a capacitor is used instead of the storage battery 22 as the power storage means. It is also possible to use this storage means, and a storage battery and a capacitor may be used in combination.
(Embodiment 1 )
FIG. 4 is a schematic configuration diagram of the energy storage type heat pump water heater in Embodiment 1 of the present invention. The configuration of the energy storage type heat pump water heater in the first embodiment will be described with reference to FIG.
The basic structure of the heat pump cycle is similar to Reference Example 2, the evaporator 16 of Reference Example 2 shown in FIG. 2, is constituted by the first evaporator 38 and second evaporator 39 for pumping up heat from the air The point that the storage battery 22 is partially provided in thermal contact with the second evaporator 39 is different from the case of the reference example 2.
  A bypass 40 extending from between the first evaporator 38 and the second evaporator 39 to the compressor 17 is provided. Further, a three-way control valve 41 is provided between the first evaporator 38 and the second evaporator 39 so that the flow rate of the refrigerant to the second evaporator 39 and the bypass 40 can be adjusted. Yes. The storage battery 22 is provided with a temperature sensor 42 that detects the temperature of the storage battery 22.
Next, the operation and operation method of the energy storage type heat pump water heater of Embodiment 1 will be described.
It is known that the storage battery 22 generates heat due to a chemical reaction, resistance, or the like associated with charging or discharging. In the first embodiment, a Ni hydrogen battery is used for the storage battery 22, and heat generation is observed particularly during charging. Such heat generation causes the temperature of the storage battery 22 to rise with the progress of charging, leading to deterioration of durability and charging characteristics.
In the energy storage type heat pump water heater of the first embodiment, the storage battery 22 and the second evaporator 39 are heated so that the temperature rise due to heat generation in the storage battery 22 is suppressed and the heat is effectively used in the heat pump cycle. The temperature level uniformity of the storage battery 22 is improved. In addition, energy efficiency is improved by using hot water for the amount of heat loss in the amount of electricity stored in the storage battery 22 and, from the heat pump cycle, by using heat at a temperature higher than the atmospheric level, high-efficiency energy storage is achieved. It becomes possible to form a heat pump water heater.
  When a Ni-hydrogen battery is used as the storage battery 22, the heat generation during charging is particularly significant as described above. Therefore, when storing inexpensive midnight power, the heat generated by the storage battery 22 is pumped up by a heat pump cycle, and the heat storage section 27. It will be used for heat storage.
  Further, this heat generation often does not always satisfy the amount of heat pumped up in the heat pump cycle with respect to the amount of heat stored in the heat storage unit 27, and a first evaporator 38 that pumps up heat from the atmosphere is provided. It is preferable. In this case, the first evaporator 38 needs to be provided on the upstream side of the refrigerant flow path with respect to the second evaporator 39 on the storage battery side that absorbs relatively high-temperature heat.
Further, when discharging from a Ni-hydrogen battery as in the first embodiment, the temperature of the storage battery 22 is a balance between heat dissipation due to a chemical reaction and heat generation due to Joule heat. If the amount of heat pumped from the storage battery 22 by the second evaporator 39 is made constant, the storage battery 22 may be cooled too much, and the battery characteristics may be deteriorated. Therefore, it is preferable to be separated from the heat pump cycle.
  Therefore, as shown in FIG. 4, a bypass 40 extending from between the first evaporator 38 and the second evaporator 39 to the compressor 17 is provided. And when discharging the storage battery 22, operating a heat pump cycle, and chasing the heat storage part 27, it distribute | circulates a refrigerant | coolant to the refrigerant | coolant flow path via the bypass 40, and does not overcool the storage battery 22. It comes to control. The amount of refrigerant flowing through the bypass 40 is adjusted by the control unit controlling the opening degree of the three-way control valve 41 based on the temperature detected by the temperature sensor 42 provided in the storage battery 22. Yes. The control valve 41 is an example of the refrigerant flow rate adjusting means of the present invention. The temperature sensor 42 is an example of a second temperature detection unit of the present invention. The bypass 40 is an example of a bypass flow path according to the present invention.
  That is, by using the energy storage type heat pump water heater having the configuration shown in FIG. 4, it is possible to use a combination of heat from the atmosphere and heat from the storage battery, and without cooling the storage battery more than necessary. It becomes possible to supply hot water with high energy efficiency.
In the first embodiment, the case where a Ni hydrogen battery is used as the storage battery 22 has been described. However, other storage batteries such as a Li secondary battery that accompany heat generation and heat dissipation have their characteristics (during charging and discharging). It is possible to change the configuration according to the heat generation and endothermic characteristics).
For example, in the case of a Li secondary battery, the calorific value at the time of discharging is often larger than that at the time of charging, and therefore, the amount of heat at the time of discharging can be used to replenish the heat storage unit 27. Further, in the configuration of Reference Example 3 shown in FIG. 3, when a Li secondary battery is used as the storage battery 22, the amount of heat at the time of discharge can be used when the water flow path 32 is heated by the heat pump rated operation.
  On the other hand, when charging in the midnight time zone, an endothermic chemical reaction occurs in the storage battery 22 at the time of charging. Therefore, even if heat is generated by Joule heat, the temperature may not be higher than that of the atmosphere. In this case, it is possible to control to prevent excessive cooling of the storage battery 22 by controlling the refrigerant to flow through the bypass 40 that does not pass through the second evaporator 39.
  If the flow of the refrigerant to the second evaporator 39 side is stopped by the control valve 41, the amount of heat pumped up by the first evaporator 38 is insufficient, and the opening degree of the control valve 41 is adjusted. Thus, an appropriate amount of heat can be pumped up by the second evaporator 39.
FIG. 5 shows a schematic diagram of another configuration of the energy storage type heat pump water heater in the first embodiment.
  When the amount of heat at the time of charging / discharging the storage battery 22 does not change so significantly, it is not necessary to provide a bypass as shown in FIG. In that case, the first evaporator 38 and the second evaporator 39 may be integrated (not shown).
FIG. 6 shows a schematic diagram of another configuration of the energy storage type heat pump water heater in the first embodiment. In addition to the configuration of FIG. 4, a three-way valve 45, a third evaporator 43, and a bypass 44 are provided between the expansion valve 19 and the first evaporator 38. A three-way valve 45 can adjust the flow rate of the refrigerant to the third evaporator 43 and the bypass 44.
  If the temperature level of the storage battery 22 is lower than the atmosphere, the second evaporator 39 cannot be used, and if the amount of heat pumped up by the first evaporator 38 alone is insufficient, a flow path to the second evaporator 39 is provided. When closed, the three-way valve 45 is controlled to flow to the third evaporator 43. By doing so, heat is pumped up from the atmosphere by the two evaporators of the first evaporator 38 and the third evaporator 43. In the configuration shown in FIG. 6, when the second evaporator 39 pumps heat from the storage battery 22, the control valve 41 is switched so that the refrigerant flows from the first evaporator 38 to the second evaporator 39. It is like that.
In addition, in this Embodiment 1 , although it was set as the structure which heat-stores the amount of heat for hot water supply in the heat storage part 27, it is good also as a structure provided with a hot water storage tank instead of the heat storage part 27, and the same effect also when using a hot water storage tank. Is obtained.
As described above, by using the energy storage type heat pump water heater of Embodiment 1 , it becomes possible to recover the heat generated by the storage battery during charging or discharging by the heat pump cycle, and the efficiency of the heat pump cycle In addition, the temperature rise that causes deterioration of the storage battery can be suppressed, the charging or discharging efficiency of the storage battery can be improved, and the life can be extended.
( Reference Example 4 )
FIG. 7 is a schematic configuration diagram of an energy storage type heat pump water heater in Reference Example 4 . The configuration of the energy storage type heat pump water heater in Reference Example 4 will be described with reference to FIG.
The basic structure of the heat pump cycle is similar to that in Reference Example 2 shown in FIG. 2, but around the battery 22, that the latent heat storage unit 46 is provided as a second thermal storage portion of the present invention, Reference Example 2 It is different from the case. The latent heat storage unit 46 is disposed on the upstream side of the heat storage unit 27 so as to be in thermal contact with the water channel 32.
Next, the operation and operation method of the energy storage type heat pump water heater of Reference Example 4 will be described.
  In FIG. 7, the latent heat storage unit 46 can make the temperature level of the storage battery 22 more uniform by storing heat generated by the storage battery 22 and absorbing heat by phase change. The water channel 32 is disposed so as to be heated by the heat exchanger 30 in the heat storage unit 27 after passing through the latent heat storage unit 46. When the water flowing through the water flow path 32 is heated by the heat exchanger 30, the temperature is raised in advance from the normal water temperature by the latent heat storage material 46, so that the COP of the heat pump cycle can be improved.
The latent heat storage unit 46 is filled with a latent heat storage material and has a shape surrounding the outer periphery of the storage battery 22. A water flow path 32 is provided around the latent heat storage unit 46 in a substantially spiral shape or a jacket shape. It is preferable to make the temperature of the storage battery 22 uniform within a range of 15 ° C. to 40 ° C., more preferably within a range of 20 ° C. to 30 ° C., and the latent heat storage material used for the latent heat storage unit 46 has a melting point in this region. It is preferable. For example, calcium chloride hexahydrate or paraffin can be used as the latent heat storage material.
In Reference Example 4 , the amount of heat for hot water supply is stored in the heat storage unit 27. However, a configuration having a hot water storage tank instead of the heat storage unit 27 may be used, and the same effect can be obtained when using a hot water storage tank. It is done.
By using the energy storage type heat pump water heater of Reference Example 4 , the storage battery can be kept at a constant temperature, and at the same time, the heat generated from the storage battery during heat dissipation can be effectively used. Therefore, the COP of the heat pump cycle can be improved.
  As described above, by using the configuration of the energy storage type heat pump water heater of the present invention, COP (coefficient of performance = calorific value / power consumption) 3 or more with a heat pump using inexpensive power such as midnight power. Therefore, it is not necessary to store all the heat boiled in the heat storage unit, and a part of the heat can be stored in the storage battery, and the heat storage unit can be downsized. Furthermore, even when the heat stored in the heat storage unit is used for hot water supply, the running cost can be increased because the heat pump cycle is activated by using the cheap power stored in the reheating of the heat storage unit. Absent. Therefore, a heat pump water heater with a low running cost can be realized while minimizing the size of the total energy storage unit.
  The heat storage type heat pump water heater related to the present invention is compact and can improve the degree of freedom of installation, and can increase the utilization of inexpensive electric power such as midnight power, and is useful as an energy-saving and highly efficient water heater. . Moreover, it is applicable also to uses, such as various heating / cooling apparatuses which applied the heat pump apparatus. In addition, it can be applied to an energy system that combines heat pump equipment with other low-cost electric power due to load leveling other than midnight power or power liberalization, or power generated from natural energy such as solar cells.
Schematic configuration of energy storage type heat pump water heater of Reference Example 1 Schematic configuration of energy storage type heat pump water heater of Reference Example 2 Schematic configuration of energy storage heat pump water heater of Reference Example 3 Configuration schematic diagram of energy storage type heat pump water heater of Embodiment 1 of the present invention Configuration schematic diagram of energy storage type heat pump water heater of other configuration of Embodiment 1 of the present invention Configuration schematic diagram of energy storage type heat pump water heater of other configuration of Embodiment 1 of the present invention Schematic configuration of energy storage type heat pump water heater of Reference Example 4 Schematic diagram of a conventional hot water storage heat pump water heater Configuration schematic diagram of a conventional heat storage heat pump water heater having a latent heat storage unit
Explanation of symbols
DESCRIPTION OF SYMBOLS 1 Evaporator 2 Compressor 3 Condenser 4 Expansion valve 5 Refrigerant flow path 6 Water flow path 7 Pouring part 8 Hot water storage tank 9 Hot water discharge part 10 Mixing plug 11 Pouring part 12 Outlet part 13 Hot water supply path 14 Heat exchanger 15 Heat storage part 16 Evaporation 17 Compressor 18 Condenser 19 Expansion valve 20 Refrigerant flow path 21 AC-DC converter 22 Storage battery 23 Hot water storage tank 24 Mixing tap 25 Hot water outlet 26 Water injection part 27 Heat storage part 28 Temperature sensor 29 Inverter 30 Heat exchanger 31 Hot water supply path 32 Water flow Path 33 Temperature sensor 34 Second condenser 35 Control valve 36 Control valve 37 Bypass 38 First evaporator 39 Second evaporator 40 Bypass 41 Control valve 42 Temperature sensor 43 Third evaporator 44 Bypass 45 Three-way valve 46 Latent heat storage unit

Claims (6)

  1. A heat pump cycle having a compressor, a first radiator, an expansion valve, and an evaporator;
    Power storage means for storing system power;
    A hot water storage tank for storing hot water heated using the heat of the first radiator,
    The compressor is operated by at least the electric power of the power storage means,
    The evaporator is composed of two parts, a first evaporator and a second evaporator, and the first evaporator, the first evaporator from the expansion valve side to the side from which the refrigerant flows out from the expansion valve. Are arranged in the order of 2 evaporators,
    The second evaporator is an energy storage type heat pump water heater in which at least a part thereof is in thermal contact with the power storage means.
  2. Furthermore, between the first evaporator and the compressor, a bypass channel through which a refrigerant can flow without passing through the second evaporator,
    A refrigerant flow rate adjusting means capable of adjusting the flow rate of the refrigerant flowing out of the first evaporator and the flow rate of flowing through the second evaporator and the flow rate of flowing through the bypass channel;
    When said storage means is caused an endothermic chemical reaction with the charging or discharging reaction, the refrigerant flow rate adjusting means, the refrigerant is controlled to flow the bypass passage, energy storage heat pump according to claim 1 Water heater.
  3. Temperature detecting means for detecting the temperature of the power storage means,
    The refrigerant flow rate adjusting means such that said temperature of the power storage means reaches a predetermined level, to adjust the flow rate of the coolant flowing through the flow rate and the bypass flow passage of the refrigerant flowing through the second evaporator, claim 2 The energy storage heat pump water heater described .
  4. A heat pump cycle having a compressor, a first radiator, an expansion valve, and an evaporator;
    Power storage means for storing system power;
    A first heat storage unit that is in thermal contact with the first radiator and heats hot water by stored heat;
    The compressor is operated by at least the electric power of the power storage means,
    The evaporator is composed of two parts, a first evaporator and a second evaporator, and the first evaporator, the first evaporator from the expansion valve side to the side from which the refrigerant flows out from the expansion valve. Are arranged in the order of 2 evaporators,
    The second evaporator is an energy storage type heat pump water heater in which at least a part thereof is in thermal contact with the power storage means.
  5. Furthermore, between the first evaporator and the compressor, a bypass channel through which a refrigerant can flow without passing through the second evaporator,
    A refrigerant flow rate adjusting means capable of adjusting the flow rate of the refrigerant flowing out of the first evaporator and the flow rate of flowing through the second evaporator and the flow rate of flowing through the bypass channel;
    5. The energy storage type heat pump according to claim 4 , wherein the refrigerant flow rate adjusting unit controls the refrigerant to flow through the bypass flow path when the power storage unit generates an endothermic chemical reaction in association with a charge or discharge reaction. Water heater.
  6. Temperature detecting means for detecting the temperature of the power storage means,
    The refrigerant flow rate adjusting means such that said temperature of the power storage means reaches a predetermined level, to adjust the flow rate of the coolant flowing through the flow rate and the bypass flow passage of the refrigerant flowing through the second evaporator, claim 5 The energy storage heat pump water heater described .
JP2003403466A 2003-12-02 2003-12-02 Energy storage type heat pump water heater Expired - Fee Related JP4159975B2 (en)

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JP2007192458A (en) * 2006-01-19 2007-08-02 Matsushita Electric Ind Co Ltd Heat pump water heater
JP2007255779A (en) * 2006-03-23 2007-10-04 Kenji Umetsu Warm/cold heat supply system
JP4901299B2 (en) * 2006-05-17 2012-03-21 中国電力株式会社 Hot water supply reheating device and reheating method
JP5029039B2 (en) * 2007-01-30 2012-09-19 東京電力株式会社 Hot water system
JP5134296B2 (en) * 2007-07-10 2013-01-30 一般財団法人電力中央研究所 Heat pump control device and heat pump control program
JP5003607B2 (en) 2008-06-18 2012-08-15 株式会社デンソー Hot water system
JP5012695B2 (en) 2008-06-26 2012-08-29 株式会社デンソー Hot water system
JP5127595B2 (en) * 2008-06-26 2013-01-23 中国電力株式会社 Hot water supply system, distribution board
JP4631967B2 (en) * 2008-12-22 2011-02-23 株式会社デンソー Power storage device
JP5405963B2 (en) * 2009-09-28 2014-02-05 パナソニック株式会社 Heat pump hot water supply system
EP2610560B1 (en) 2010-07-07 2016-12-07 Panasonic Intellectual Property Management Co., Ltd. Hot water storage-type hot water supply system and method for operating same
WO2014019755A1 (en) * 2012-08-01 2014-02-06 Siemens Aktiengesellschaft Power station system and method for operating such a power station system
JP6089670B2 (en) * 2012-12-14 2017-03-08 ダイキン工業株式会社 Hot water system
JP6089669B2 (en) * 2012-12-14 2017-03-08 ダイキン工業株式会社 Hot water system
JP6344015B2 (en) * 2014-03-31 2018-06-20 ダイキン工業株式会社 Hot water system

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