JP2809853B2 - Heat pump system with cold / hot latent heat storage - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat pump system with a cold / hot latent heat storage device that can store and use one or both of cold and hot heat.

[Conventional technology]

In the winter season, hot water production is required for hot water heating and hot water supply, but in recent years, with the increase in cooling and heating systems, air conditioning for applications with high temperature and humidity levels for cooling and heating has increased, and hot water production is also required in the summer. Is coming.

In the winter season, a heat source is required for heating, and a cooling source is required for cooling a computer.

As described above, simultaneous supply of a cold heat source and a hot heat source is required, and thus a heat storage system that stores cheap electric power at night and uses it during the day is required.

Under such circumstances, as a heat storage system of a cold heat source, for example, a refrigeration system with a latent heat storage device that uses a latent heat storage device that stores a large amount of cold heat by using latent heat generated during a phase change between a liquid and a solid. It has been known.

FIG. 13 shows a conventional refrigeration system with a latent heat storage device.

In the figure, reference numeral 101 indicates a refrigeration cycle, and the refrigeration cycle 101 includes a compressor 102, a condenser 103, and an expansion valve 104.
And an evaporator 105.

Reference numeral 106 denotes a first brine circulation circuit, which shares the refrigeration cycle 101 and the evaporator 105, and is provided with a brine pump 107 and a latent heat storage device 108 on the way.

The latent heat storage device 108 is filled with a latent heat storage medium 108A and has a large cylindrical shape. The latent heat storage medium 108A is obtained by injecting a latent heat medium (chemical substance) having a high latent heat of fusion into a spherical special polymer container of, for example, a tennis size ball, and sealing the container.

Reference numeral 109 denotes a second brine circulation circuit, which shares the latent heat regenerator 108 with the first brine circulation circuit 106, and is provided with a brine pump 110 and a heat exchanger 111 for producing cold water.

A chilled water circulation circuit 112 shares the second brine circulating circuit 109 and the chilled water production heat exchanger 111, and chilled water is circulated by a pump 113 provided in the middle thereof. An air conditioner 114 cooled by cold water is provided in the middle of the cold water circulation circuit 112.

Thus, the first evaporator 105 of the refrigeration cycle 101
Of the brine circulation circuit 106 is cooled. First
Cold heat is transferred to the latent heat storage device 108 and stored in the latent heat storage device 108 through the brine circulating through the brine circulation circuit 106.

In addition, the second brine circulation circuit 109 and the cold water circulation circuit 112
Is operated to release heat from the latent heat storage medium 108A in the latent heat storage device 108, the brine circulating through the second brine circulation circuit 109 is cooled by the latent heat storage medium 108A. The cooled brine is conveyed to the heat exchanger 111 for producing cold water, and is cooled by the heat exchanger 111 for producing cold water.
Is cooled, and the air conditioner 114 is cooled via the cold water.

[Problems to be solved by the invention]

However, the conventional refrigeration system with a latent heat storage device is exclusively used for cooling, and has the following problems.

The operation period was limited to summer and mid-term operation. Even if nighttime operation was used, the operation time was short and the operation rate was poor.

As air conditioning for applications with high temperature and humidity levels of air conditioning and heating has increased, hot water production has become necessary even in the summer.However, to store heat for hot water production, heating is required separately from the refrigeration system with a latent heat storage unit described above. A heat source is required.

In the winter season, a heat source is required for heating, and a cooling source is required for cooling a computer.

For these reasons, there is an increasing need for a heat source that can simultaneously supply cold and hot heat sources.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to store one or both of cold heat and hot heat at the same time, and dissipate heat while storing heat, or perform cold heat only. An object of the present invention is to provide a heat pump system with a latent heat storage device.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a latent heat storage medium for cooling, which is filled with a latent heat storage medium for cooling and a refrigerant passes between the latent heat storage medium for cooling and used as an evaporator, and a latent heat storage for heating. A heat storage medium is filled, and the refrigerant passes between the latent heat storage mediums for heating, and has a latent heat storage element for heating used as a condenser.The space between the latent heat storage element for cooling and the latent heat storage element for heating is provided. A refrigeration cycle in which the refrigerant circulates, a refrigeration cycle and a latent heat regenerator for refrigeration are shared, and a chilled water refrigerant circulation circuit in which the same refrigerant circulates as the refrigeration cycle is interposed by a liquid pump interposed midway. The same refrigerant as the refrigeration cycle is provided by a chilled water production heat exchanger that is provided on the way to supply cooling heat to the cooling load via chilled water, and shares the refrigeration cycle and the latent heat storage device for heating with a liquid pump interposed on the way. Circulates And hot coolant circulation circuit, in which and a hot water producing heat exchanger for supplying heat to the heating load through the hot water provided in the middle of the hot water supply refrigerant circulating circuit.

The latent heat regenerator for heat and the latent heat regenerator for cold of the refrigeration cycle can be connected in parallel to the condenser / evaporator via a pair of refrigerant pipes each provided with an on-off valve in the middle.

In addition, an auxiliary evaporator is connected to the cooling heat latent heat storage device of the refrigeration cycle via a pair of refrigerant pipes each provided with an on-off valve in the middle, and the heating latent heat storage device of the refrigeration cycle is connected to the cooling heat latent heat storage device. An auxiliary condenser can be connected through a pair of refrigerant pipes each provided with an on-off valve.

Further, an auxiliary condenser can be connected to the latent heat storage device for heating of the refrigeration cycle via a pair of refrigerant pipes each provided with an on-off valve on the way.

An auxiliary evaporator can be connected to the cooling latent heat regenerator of the refrigeration cycle via a pair of refrigerant pipes each provided with an on-off valve in the middle.

(Operation)

According to the first aspect of the present invention, first, when the operation of the refrigerant circulation circuit for cold water and the refrigerant circulation circuit for hot water is stopped and the refrigeration cycle is operated, a latent heat storage device for refrigeration used as an evaporator of the refrigeration cycle. Inside, the refrigerant evaporates, and the heat of evaporation evaporates the latent heat storage medium for cold energy to store the cold energy. At the same time, in the latent heat storage device for heat used as a condenser, the refrigerant is condensed, and the condensed heat causes the latent heat storage medium for heating to be heated and heat is stored.

Second, when the operation of the refrigeration cycle and the circulation circuit for hot water is stopped and the circulation circuit for cold water is operated, the latent heat storage medium for cooling in the latent heat storage device for cooling radiates heat, and the latent heat storage medium for cooling Then, heat is exchanged between the refrigerant circulated through the cold water refrigerant circulation circuit and the refrigerant guided into the cold heat latent heat storage device, and the refrigerant in the cold water refrigerant circulation circuit is cooled. The cooled refrigerant is transferred to the heat exchanger for producing cold water, and cold heat is supplied to the cooling load via the cold water from the heat exchanger for producing cold water.

Third, when the refrigeration cycle and the coolant circulation circuit for cold water are stopped and the coolant circulation circuit for hot water is operated, the latent heat storage medium in the latent heat storage device for heat dissipates heat. The refrigerant circulates through the refrigerant circuit and exchanges heat with the refrigerant guided into the latent heat storage device for heating, and the refrigerant in the refrigerant circuit for hot water is heated. The heated refrigerant is conveyed to the heat exchanger for producing hot water, and heat is supplied from the heat exchanger for producing hot water to the heating load via the hot water.

Fourth, when the operation of the hot water refrigerant circuit is stopped and the refrigeration cycle and the cold water refrigerant circuit are operated, the cold heat and the hot heat are stored in the cold heat latent heat storage device and the warm heat latent heat storage device, respectively. Then, the cooling heat latent heat storage medium in the cooling heat latent heat storage device radiates heat, and cold heat is supplied to the cooling load via the cold water from the cold water production heat exchanger.

Fifth, when the operation of the coolant circulation circuit for cold water is stopped and the refrigeration cycle and the coolant circulation circuit for hot water are operated, the cold heat and the warm heat are stored in the cold heat latent heat storage device and the warm heat latent heat storage device, respectively. Then, the latent heat storage medium for heating in the latent heat storage device for heat radiates heat, and the heat is supplied from the heat exchanger for producing hot water to the heating load via the hot water.

Sixth, when the refrigeration cycle, the refrigerant circulation circuit for cold water, and the refrigerant circulation circuit for hot water are operated, the cold heat and the warm heat are respectively stored in the cold heat latent heat storage device and the warm heat latent heat storage device, respectively. The latent heat storage medium for cooling in the chamber radiates heat, and while cooling is supplied to the cooling load,
The latent heat storage medium for heat in the latent heat storage device for heat dissipates heat, and heat is supplied to the heating load.

According to the second aspect of the present invention, the condenser / evaporator is used for storing the heat and the cold when the latent heat storage for heating and the latent storage for cooling are in a saturated state or the like. Alternatively, the refrigerant is used as an auxiliary of a latent heat storage device for cooling, and the refrigerant is carried to a condenser / evaporator and radiated to the atmosphere.

Thus, when the condenser / evaporator is used as a condenser, when the storage state of the heating latent heat storage device is in a saturated state or the like, cold heat is stored in the cooling latent heat storage device of the refrigeration cycle.

Further, when the condenser / evaporator is used as an evaporator, when the storage state of the cooling latent heat storage device is in a saturated state or the like, the heat is stored in the heating latent heat storage device of the refrigeration cycle.

According to the third aspect of the invention, the same operation as the second aspect of the invention is produced.

According to the fourth aspect of the present invention, cold energy is stored in the cold latent heat regenerator of the refrigeration cycle by the action of the auxiliary condenser.

In the fifth aspect of the invention, the heat is stored in the heating latent heat regenerator of the refrigerating cycle by the action of the auxiliary evaporator.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a heat pump system with a cold / hot latent heat storage device according to a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a refrigeration cycle, and the refrigeration cycle 1 has a cooling heat latent heat storage device 2, a compressor 3, a heating heat latent heat storage device 4, and an expansion valve 5.

The cooling heat latent heat storage device 2 is filled with the cooling heat latent heat storage medium 2A and the refrigerant passes between the cooling heat latent heat storage media 2A and is used as an evaporator, and has a large cylindrical shape.
The latent heat storage medium 2A for cooling is, for example, a closed space made by injecting a latent heat medium (chemical substance) having a high latent heat of fusion into a spherical special polymer container such as a tennis sized ball.

The latent heat storage device for heating 4 is filled with the latent heat storage medium for heating 4A, and the refrigerant passes between the latent heat storage media for heating 4A and is used as a condenser, and has a large cylindrical shape.
The latent heat storage medium for heating 4A is obtained by injecting a latent heat medium (chemical substance) having a high latent heat of solidification into a spherical special polymer container of, for example, a tennis-sized ball and sealing it.

The gas side of the latent heat regenerator 2 for cooling and the gas side of the latent heat regenerator 4 for heating are connected by a gas refrigerant pipe 6, and the compressor 3 is provided in the gas refrigerant pipe 6. The liquid side of the cooling heat latent heat storage device 2 and the liquid side of the heating latent heat storage device 4 are connected by a refrigerant liquid pipe 7, and an expansion valve 5 is provided in the refrigerant liquid pipe 7.

Reference numeral 8 denotes a refrigerant circulation circuit for cold water, which shares the refrigerating cycle 1 and the latent heat regenerator 2 for cold heat, and includes a liquid pump 9, a switching valve 10, and a heat exchanger 11 for cold water production in this order.

Reference numeral 12 denotes a chilled water circulation circuit, which shares the chilled water refrigerant circulation circuit 8 and the chilled water production heat exchanger 11 with a pump 13 provided in the middle thereof.
Circulates cold water. A cooling load 14 is provided in the middle of the cold water circulation circuit 12. Examples of the cooling load 14 include an air conditioner and a cold heat supply facility in a production process of each industry such as the food industry and the chemical industry.

Reference numeral 15 denotes a refrigerant circulation circuit for hot water, which shares the refrigeration cycle 1 and the latent heat regenerator 4 for heating, and a liquid pump 16 and a heat exchanger 17 for hot water production are interposed in this order.

A hot water circulation circuit 18 shares a hot water refrigerant circulation circuit 15 and a heat exchanger 17 for hot water production, and a pump 19 provided in the middle thereof.
Circulates warm water. A heating load 20 is provided in the hot water circulation circuit 18. Examples of the heating load 20 include an air conditioner and a heat supply facility in a production process of each industry such as the food industry and the chemical industry.

Reference numeral 21 denotes a condenser / evaporator, which is connected to the condenser / evaporator 21 via a pair of refrigerant pipes 22 and 23 for cooling.
Is connected. The refrigerant pipes for cooling 22 and 23 are connected to portions 8A and 8A of the refrigerant circuit for cooling water 8 which are close to the latent heat storage device 2 for cooling.
Merges with B respectively. A pair of refrigerant pipes for cooling 22 and 23
A first on-off valve 22A and a second on-off valve 23A are provided in the middle of the process.

In addition, a pair of refrigerant pipes 2 for heating is connected to the condenser / evaporator 21.
The latent heat regenerator 4 for heating is connected via 4 and 25. A third on-off valve 24A and a fourth on-off valve 25A are provided in the middle of the pair of heating refrigerant pipes 24, 25, respectively.

The latent heat storage device 2 for cooling and the latent heat storage device 4 for heating are located in parallel with the condenser / evaporator 21.

Next, the operation of this embodiment will be described with reference to FIGS. In the drawing, the thick solid line in the refrigeration cycle 1 indicates the flow of the refrigerant liquid, and the thick dotted line indicates the flow of the refrigerant gas.

FIG. 2 shows an operation state of cold heat storage in the heat pump system with a cold / hot latent heat storage device of the present embodiment.

In this operation state, the operation of the cold water refrigerant circulation circuit 8 and the hot water refrigerant circulation circuit 15 is stopped, and at the same time, the first on-off valve 22A and the second on-off valve 23A are closed, and the third on-off valve 24A and the fourth on-off valve It is obtained by operating the refrigeration cycle 1 with 25A opened, and forms a circulation path shown by a thick line.

In the cold heat latent heat storage device 2 used as the evaporator of the refrigeration cycle 1, the refrigeration evaporates, and the heat of evaporation cools the cold heat latent heat storage medium 2A to store cold heat. The evaporated and gasified refrigerant is compressed by the compressor 3 and carried to the latent heat storage unit 4 for heat used as a condenser, and a part of the refrigerant is condensed and liquefied, and the latent heat for heat is generated by the heat of condensation. The heat storage medium 4A is heated and heat is stored.

When the heat storage state of the heating latent heat storage device 4 reaches a saturated state or is in that state, the heat is not stored in the heating latent heat storage device 4, and the refrigerant gas flows from the heating latent heat storage device 4 through the heating refrigerant pipe 25. Through the condenser / evaporator 21, where the refrigerant is condensed and liquefied,
The process returns to the latent heat storage device 4 for heating via 24. That is, the heat of condensation is radiated to the atmosphere by the condenser / evaporator 21. At this time, the condenser / evaporator 21 acts as a condenser.

The refrigerant liquefied by the heating latent heat storage device 4 and the condenser / evaporator 21 is conveyed from the heating latent heat storage device 4 to the expansion valve 5 via the refrigerant liquid pipe 7 and expanded by the expansion valve 5. Then, it is again guided to the latent heat storage device 2 for cooling. In this way,
Refrigerant circulates.

FIG. 3 shows an operation state of heat radiation of the heat in the heat pump system with the cold / hot latent heat storage device of the present embodiment.

This operation state is refrigeration cycle 1, hot water refrigerant circulation circuit
This is obtained by stopping the operation of 15 and operating the refrigeration circuit 8 for cold water to form a circulation path indicated by a thick line.

In this operation state, the cooling heat latent heat storage medium 2A in the cooling heat latent heat storage device 2 radiates heat, and the cooling heat latent heat storage medium 2A
The refrigerant circulated through the cold water refrigerant circulation circuit 8 exchanges heat with the refrigerant guided into the cold heat latent heat regenerator 2, and the refrigerant in the cold water refrigerant circulation circuit 8 is cooled. The cooled refrigerant is conveyed to the chilled water production heat exchanger 11, and the chilled water of the chilled water circulation circuit 12 is cooled by the chilled water production heat exchanger 11, and the cooling load 14 is cooled by the chilled water of the chilled water circulation circuit 12. .

FIG. 4 shows an operation state of the thermal heat storage in the heat pump system with a cold / hot latent heat storage device of the present embodiment.

In this operation state, the operation of the cold water refrigerant circulation circuit 8 and the hot water refrigerant circulation circuit 15 is stopped, and at the same time, the first on-off valve 22A and the second on-off valve 23A are opened, and the third on-off valve 24A and the fourth on-off valve It is obtained by operating the refrigeration cycle 1 with 25A closed, and forms a circulation path indicated by a thick line.

In the cooling latent heat storage device 2 used as the evaporator of the refrigeration cycle 1, a part of the refrigerant evaporates, and the evaporated heat cools the cooling heat latent heat storage medium 2A to store cold heat.

When the heat storage state of the cooling heat latent heat storage device 2 reaches a saturated state or is in that state, heat is not stored in the cooling heat latent heat storage device 2, and the refrigerant liquid is transferred from the cooling heat latent heat storage device 2 to the cooling heat refrigerant pipe 22. Through the condenser / evaporator 21, where it is evaporated and gasified,
The flow returns to the latent heat storage device 2 for cooling via 23. That is, the evaporation heat is radiated to the atmosphere by the condenser / evaporator 21. At this time, the condenser / evaporator 21 acts as an evaporator.

The vaporized and gasified refrigerant is compressed by the compressor 3 and transferred to the latent heat storage device 4 for heat used as a condenser,
Condensed and liquefied, the latent heat storage medium for warming by the heat of condensation
4A is heated and heat is stored.

The refrigerant liquefied by the heating latent heat storage device 4 is transferred from the heating latent heat storage device 4 to the expansion valve 5 via the refrigerant liquid pipe 7, expanded by the expansion valve 5, and again cooled and cooled. It is led to 2. In this way, the refrigerant circulates.

FIG. 5 shows an operation state of heat radiation in the heat pump system with a cold / hot latent heat storage device of the present embodiment.

This operating state is obtained by stopping the operation of the refrigeration cycle 1 and the refrigerant circulation circuit 8 for cold water, and operating the refrigerant circulation circuit 15 for hot water, thereby forming a circulation path indicated by a thick line.

In this operation state, the heating latent heat storage medium 4A in the heating latent heat storage device 4 radiates heat, and this heating latent heat storage medium 4A
The refrigerant is circulated through the hot water refrigerant circuit 15 and exchanges heat with the refrigerant guided into the warm heat latent heat regenerator 4, so that the freezing of the hot water refrigerant circuit 15 is heated. The heated refrigerant is conveyed to the heat exchanger 17 for hot water production, and the hot water in the hot water circulation circuit 18 is heated by the heat exchanger 17 for hot water production.
The heating load 20 is heated by the warm water.

FIG. 6 shows an operation state of cold heat storage and cold heat radiation in the heat pump system with a cold / hot latent heat storage device of the present embodiment.

In this operating state, the operation of the hot water refrigerant circulation circuit 15 is stopped, the first on-off valve 22A and the second on-off valve 23A are closed, and the third on-off valve 24A and the fourth on-off valve 25A are open. 1,
It is obtained by operating the refrigerant circuit 8 for cold water, and forms a circulation path shown by a thick line.

In this operating state, cold heat is stored in the cold latent heat storage device 2, and warm heat is stored when the heat storage state of the warm latent heat storage device 4 is not saturated. At the same time as the cold heat is stored, the latent heat storage medium for cooling 2A in the latent heat storage device for cooling 2 radiates heat, and the cold heat is transferred to the heat exchanger 11 for producing cold water through the refrigerant circulation circuit 8 for cold water, and is transmitted through the cold water. Thus, cold heat is supplied to the cooling load 14. When the heat storage state of the heating latent heat storage device 4 reaches a saturated state or is in that state, the heat is not stored in the heating latent heat storage device 4, and the refrigerant gas is not condensed and evaporated.
It is condensed and liquefied at 21, and the heat of condensation is released to the atmosphere.
At this time, the condenser / evaporator 21 acts as a condenser.

FIG. 7 shows an operation state of heat storage and heat radiation in the heat pump system with a cold / hot latent heat storage device of this embodiment.

In this operating state, the operation of the refrigeration circuit 8 is stopped, the first on-off valve 22A and the second on-off valve 23A are opened, and the third on-off valve 24A and the fourth on-off valve 25A are closed. 1,
It is obtained by operating the hot water refrigerant circuit 15, and forms a circulation path indicated by a thick line.

In this operating state, warm heat is stored in the warm heat latent heat storage device 4, and cold heat is stored when the heat storage state of the cool heat latent heat storage device 2 is not saturated. At the same time as the heat is stored, the latent heat storage medium for heat 4A in the latent heat storage device for heat 4 radiates heat, and the heat is transferred to the heat exchanger 17 for producing hot water via the refrigerant circulation circuit 15 for heat, and is transferred through the hot water. Thus, heat is supplied to the heating load 20. When the heat storage state of the cooling heat latent heat storage device 2 reaches a saturated state or is in such a state, the heat is not stored in the cooling heat latent heat storage device 2 and the refrigerant gas is not charged by the condenser / evaporator.
It evaporates and gasifies at 21 and the heat of evaporation is released to the atmosphere. At this time, the condenser / evaporator 21 acts as an evaporator.

FIG. 8 shows an operation state (cooling load> heating load) of the cold / hot heat storage and the cold / hot heat radiation of the heat pump system with the cold / hot latent heat storage device of the present embodiment. For example, it is used as a heat source for heating in winter and for cooling a computer.

In this operation state, when the cooling load> the heating load, the first on-off valve 22A and the second on-off valve 23A are closed, and the third on-off valve 24A and the fourth on-off valve 25A are opened. The refrigerant circulation circuit 8 and the hot water refrigerant circulation circuit 15 are operated to form a circulation path indicated by a thick line.

This operation state is obtained by adding the operation state of the heat storage and the heat radiation to the operation state of the cold heat storage and the heat radiation of FIG. 6, and the cold heat is stored in the latent heat storage device 2 for the cold heat. Heat is stored in the regenerator 4, and at the same time, heat is radiated by the latent heat regenerator 2 for cooling and the latent heat regenerator 4 for heating. Cold heat is transferred to the cold water production heat exchanger 11 via the cold water refrigerant circulation circuit 8, and is supplied to the cooling load 14 via the cold water. Heat is transferred to the heat exchanger 17 for producing hot water via the refrigerant circulation circuit 15 for hot water, and is supplied to the heating load 20 via the hot water. Note that when the heat storage state of the heating latent heat storage device 4 reaches a saturated state or is in that state, the heating latent heat storage device 4
Is not stored, and the refrigerant gas is condensed and
It liquefies and its heat of condensation is released to the atmosphere.

FIG. 9 shows an operation state of cooling / heating heat storage and cooling / heating heat radiation (cooling load <heating load) of the heat pump system with a cooling / heating latent heat storage device of the present embodiment. For example, it is used as a heat source for heating in winter and for cooling a computer.

In this operation state, when the cooling load is smaller than the heating load, the first on-off valve 22A and the second on-off valve 23A are opened, and the third on-off valve 24A and the fourth on-off valve 25A are closed. The refrigerant circulation circuit 8 and the hot water refrigerant circulation circuit 15 are operated to form a circulation path indicated by a thick line.

This operating state is the same as the operating state in FIG.
The heat storage state of the cooling heat latent heat storage device 2 may reach a saturated state,
In this state, the difference is that heat is not stored in the latent heat storage device 2 for cooling and cooling, and the refrigerant liquid evaporates and gasifies in the condenser / evaporator 21, and the evaporation heat is released to the atmosphere.

According to the above-described configuration, the refrigeration cycle 1 is provided with the latent heat storage device 2 for cooling which is used as an evaporator and stores cold heat, and the latent heat storage device 4 for heating which is used as a condenser and stores heat. Therefore, the heat storage and heat radiation of the cold heat by the latent heat storage device for cooling 2 and the heat storage of the heat by the latent heat storage device 4 for the heating
By freely combining heat dissipation, for example, cold heat storage, cold heat dissipation, warm heat storage, warm heat dissipation,
Cold heat storage and heat dissipation, warm heat storage and heat dissipation,
Various combinations of operation such as cold / hot heat storage and cold / hot heat radiation can be selected. That is, cold / hot heat can be stored, and one or both of them can be supplied as needed.

Therefore, the operation period is not limited to the operation in the summer and the intermediate period, and the operation can be performed in the winter, and the operation rate can be improved.

Further, even in the summer, when hot heat storage is required for hot water production, it is not necessary to install a facility for a hot heat source separately from the refrigeration system with a latent heat storage device for storing cold heat described in the conventional example.

When the heat is stored, the cooling latent heat storage medium 2A and the heating latent heat storage medium 4A are in direct contact with the refrigerant in the cooling latent heat storage 2 and the heating latent heat storage 4, so that the cooling latent heat storage is used. Heat exchange involving a phase change between the medium 2A and the latent heat storage medium for warming 4A is performed, and heat can be stored in a much larger amount and more quickly than with sensible heat exchange using cold and hot water.

Further, at the time of heat radiation, heat exchange involving a phase change of the latent heat storage medium 2A for cooling and the latent heat storage medium 4A for heat is performed in the latent heat storage unit 2 for cooling and the latent heat storage unit 4 for heating. The heat can be dissipated rapidly in a significantly larger amount than the sensible heat exchange used.

Therefore, the capacity of the compressor 3 of the refrigeration cycle 1 has a margin, and the COP (theoretical coefficient of performance) can be improved.

In this embodiment, the latent heat regenerator 2 for cooling and the latent heat regenerator 4 for warming are located in parallel with the condenser / evaporator 21 and are used as a condenser or an evaporator by switching an on-off valve. However, the condenser / evaporator 21 is used for heat dissipation when the storage state of the latent heat storage unit 2 for cooling and the latent heat storage unit 4 for heating is in a saturated state. Even without 21, hot and cold heat can be stored in the cold heat latent heat storage device 2 and the warm heat latent heat storage device 4.

FIG. 10 shows a heat pump system with a cold / hot latent heat storage device according to a second embodiment of the present invention. The second embodiment has the same configuration as the first embodiment, but different points will be described. The same components as those in the first embodiment are denoted by the same reference numerals.

In the first embodiment, a latent heat regenerator 2 for cooling and a latent heat regenerator 4 for warming are arranged in parallel with a condenser / evaporator 21 and are used as a condenser or an evaporator by switching an open / close valve. In the present embodiment, however, the first on-off valve 31A and the second on-off valve 32 are provided in the cooling latent heat regenerator 2 of the refrigeration cycle 1 on the way.
An auxiliary evaporator 33 is connected via a pair of refrigerant pipes 31, 32 provided with A, respectively, and the cooling / heating refrigerant pipes 31, 32 are
The cooling water circulation circuit 8 merges with portions 8A and 8B near the cooling heat latent heat storage device 2 side. On the other hand, an auxiliary condenser 36 is connected to the warming latent heat storage device 4 via a pair of refrigerant pipes 34 and 35 provided with a third opening / closing valve 34A and a fourth opening / closing valve 35A, respectively.

According to the second embodiment, the same operation and effect as those of the first embodiment can be obtained.

FIG. 11 shows a heat pump system with a cold / hot latent heat storage device according to a third embodiment of the present invention. The third embodiment has the same configuration as the first embodiment, but different points will be described. The same components as those in the first embodiment are denoted by the same reference numerals.

In the first embodiment, a latent heat regenerator 2 for cooling and a latent heat regenerator 4 for warming are arranged in parallel with a condenser / evaporator 21 and are used as a condenser or an evaporator by switching an open / close valve. However, in the present embodiment, the auxiliary condenser 4 is connected to the latent heat regenerator 4 for heating of the refrigeration cycle 1 through a pair of refrigerant pipes 41 and 42 provided with on-off valves 41A and 42A, respectively.
3 is connected.

According to the third embodiment, the auxiliary condenser 43 has a function in which the function of the evaporator is reduced from the condenser / evaporator 21 of the first embodiment, and correspondingly, the same as the first embodiment. Works and effects.

FIG. 12 shows a heat pump system with a cold / hot latent heat storage device according to a fourth embodiment of the present invention. The fourth embodiment has the same configuration as the first embodiment, but different points will be described. The same components as those in the first embodiment are denoted by the same reference numerals.

In the first embodiment, a latent heat regenerator 2 for cooling and a latent heat regenerator 4 for warming are arranged in parallel with a condenser / evaporator 21 and are used as a condenser or an evaporator by switching an open / close valve. In this embodiment, however, the auxiliary evaporator 53 is provided to the cooling latent heat regenerator 2 of the refrigeration cycle 1 through a pair of refrigerant pipes 51, 52 provided with on-off valves 51A, 52A, respectively.
Is connected. The refrigeration refrigerant pipes 51 and 52 are connected to portions 8A and 8B of the refrigeration circuit 8 for cooling and cooling which are close to the latent heat storage device 2 for cooling.
With each other.

According to the fourth embodiment, the auxiliary evaporator 53 has a function in which the function of the condenser is reduced from the condenser / evaporator 21 of the first embodiment, and correspondingly, the same as the first embodiment. Works and effects.

〔The invention's effect〕

As described above, according to the first aspect of the present invention, in the refrigeration cycle, a latent heat regenerator for cooling which is used as an evaporator and stores cold heat, and a latent heat regenerator for heating which is used as a condenser and stores hot heat is provided. Since it is arranged, various combinations of operation can be selected by freely combining the heat storage and heat radiation of the cold heat by the latent heat storage device for cooling and the heat storage and heat radiation of the heat by the latent heat storage device for heating. .
That is, cold / hot heat can be stored, and one or both of them can be supplied as needed.

Accordingly, the operation period is not limited to the operation in the summer and the intermediate period, and the operation can be performed in the winter, and the operation rate can be improved.

In addition, even in summer, when hot heat storage is required for hot water production, equipment for a hot heat source need not be installed separately from a refrigeration system with a latent heat storage device that stores cold heat.

During the heat storage, the cooling latent heat storage medium, the heating latent heat storage medium and the refrigerant are in direct contact with each other in the cooling latent heat storage element and the heating latent heat storage element. Heat exchange involving a phase change of the latent heat storage medium is performed, and heat can be stored in a much larger amount and more quickly than sensible heat exchange using cold and hot water.

In addition, during heat radiation, heat exchange with a phase change of the latent heat storage medium for cooling and the latent heat storage medium for heating is performed in the latent heat storage device for cooling and the latent heat storage device for heating, and the sensible heat The heat can be rapidly dissipated in a significantly larger amount than by replacement.

Therefore, there is a margin in the capacity of the compressor of the refrigeration cycle,
COP (theoretical coefficient of performance) can be improved.

According to the second aspect of the present invention, when storing hot and cold heat,
When the heat storage state of the latent heat storage device for heating and cooling is in a saturated state, etc., the condenser / evaporator is used as an auxiliary of the latent heat storage device for cooling or the latent heat storage device for heating. Can be stored.

According to the third aspect of the present invention, when the storage state of the latent heat storage device for heat is in a saturated state or the like, the auxiliary condenser can store cold heat in the latent heat storage device for cooling in the refrigeration cycle.

Further, the auxiliary evaporator can store heat in the warming latent heat regenerator of the refrigeration cycle when the heat storage state of the cooling heat latent heat regenerator is in a saturated state or the like.

According to the fourth aspect of the present invention, when the heat storage state of the heating latent heat storage device is in a saturated state or the like, the auxiliary condenser can store cold heat in the cooling latent heat storage device of the refrigeration cycle.

According to the fifth aspect of the invention, when the heat storage state of the cooling latent heat storage device is in a saturated state or the like, the heat can be stored in the heating latent heat storage device of the refrigeration cycle by the auxiliary evaporator. To play.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a heat pump system with a cold / hot latent heat storage device according to a first embodiment of the present invention. FIG. 2 is an operation state explanatory diagram showing an operation state of cold heat storage in the heat pump system with the cold / hot latent heat storage device. FIG. 3 is an operation state explanatory diagram showing an operation state of cooling heat radiation in the heat pump system with the cold / hot latent heat storage device. FIG. 4 is an operation state explanatory diagram showing an operation state of heat storage in the heat pump system with the cold / hot latent heat storage device. FIG. 5 is an operation state explanatory diagram showing an operation state of heat radiation in the heat pump system with the cold / hot latent heat storage device. FIG. 6 is an operation state explanatory diagram showing an operation state of cold heat storage and cold heat radiation in the heat pump system with the cold / hot latent heat storage device. FIG. 7 is an operation state explanatory diagram showing an operation state of thermal heat storage and thermal heat radiation in the heat pump system with the cold / hot latent heat storage device. FIG. 8 is an operation state explanatory diagram showing an operation state of cooling / heating heat storage and cooling / heating heat radiation (cooling load> heating load) of the heat pump system with the cooling / heating latent heat storage device. FIG. 9 is an operation state explanatory view showing an operation state (cooling load <heating load) of the cold / hot heat storage and the cold / hot heat radiation of the heat pump system with the cold / hot latent heat storage device. FIG. 10 is a configuration diagram of a heat pump system with a cold / hot latent heat storage device according to a second embodiment of the present invention. FIG. 11 is a configuration diagram of a heat pump system with a cold / hot latent heat storage device according to a third embodiment of the present invention. FIG. 12 is a configuration diagram of a heat pump system with a cold / hot latent heat storage device according to a fourth embodiment of the present invention. FIG. 13 is a configuration diagram of a conventional refrigeration system with a latent heat storage device. [Description of Signs of Main Parts] 1 Refrigeration cycle 2 Latent heat storage device for cooling 2A Latent heat storage medium for cooling 4 Latent heat storage device for heating 4A Latent heat storage medium for heating 8 Cold water Refrigerant circuit 9 for liquid pump 11 Heat exchanger for cold water production 14 Cooling load 15 Refrigerant circuit for hot water 16 Liquid pump 17 Heat exchanger for hot water production 20 Heating load .

Claims (5)

(57) [Claims] 1. A latent heat storage medium for cooling which is filled with a latent heat storage medium for cooling and a refrigerant passes between the latent heat storage medium for cooling and used as an evaporator, and a latent heat storage medium for heating is filled. Having a latent heat storage device for heating, which is used as a condenser when the refrigerant passes between the latent heat storage media for heating,
A refrigeration cycle in which the refrigerant circulates between the latent heat storage device for cooling and the latent heat storage device for heating, and the same refrigerant as the refrigeration cycle is shared by a liquid pump that shares the refrigeration cycle and the latent heat storage device for cooling. A circulating chilled water refrigerant circuit, a chilled water production heat exchanger provided in the middle of the chilled water refrigerant circuit to supply cooling heat to the cooling load via chilled water, and a refrigeration cycle and a latent heat storage device for heating. A refrigerant circuit for hot water in which the same refrigerant as the refrigeration cycle is circulated by a liquid pump interposed in the middle, and a hot water production circuit that is provided in the middle of the refrigerant circuit for hot water and supplies heat to a heating load via hot water. A heat pump system with a cold / hot latent heat storage device, comprising: a heat exchanger. 2. The method according to claim 1, wherein the latent heat regenerator for heating and the latent heat regenerator for cooling of the refrigerating cycle are connected in parallel to the condenser / evaporator through a pair of refrigerant pipes each provided with an on-off valve in the middle. The heat pump system with a cold / hot latent heat storage device according to claim 1. 3. An auxiliary evaporator is connected to the cooling latent heat regenerator of the refrigeration cycle via a pair of refrigerant pipes each provided with an on-off valve in the middle of the refrigerating cycle. 2. The heat pump system with a cold / hot latent heat storage device according to claim 1, wherein an auxiliary condenser is connected via a pair of refrigerant pipes each provided with an on-off valve in the middle. 4. The cooling / heating apparatus according to claim 1, wherein an auxiliary condenser is connected to the heating latent heat regenerator of the refrigeration cycle through a pair of refrigerant pipes each provided with an on-off valve in the middle. Heat pump system with latent heat storage. 5. An apparatus according to claim 1, wherein an auxiliary evaporator is connected to the cooling latent heat regenerator of the refrigerating cycle via a pair of refrigerant pipes each provided with an on-off valve in the middle. Heat pump system with latent heat storage.