JP3423652B2 - Thermal storage refrigeration and air conditioning system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes use of accumulated cold heat (heat storage) in a refrigerating cycle for cooling a refrigerated showcase for refrigerating and storing foods and the like.
The present invention relates to a heat storage type refrigerating and air-conditioning system that equalizes the electric power load of a heat source device and reduces the heat source device capacity, and reduces the electricity charge associated with food storage.

[0002]

2. Description of the Related Art Conventionally, a heat storage tank is shared between a refrigeration cycle for heating and cooling and a refrigeration cycle for keeping cold such as a showcase, and cold heat is stored and utilized through the heat storage tank. By performing the above, a heat storage type refrigerating air conditioner is known that can reduce the capacity of the air conditioner and the refrigerator and further reduce the running cost.

As such a conventional heat storage type refrigerating air conditioner, for example, a "heat accumulating type refrigerating air conditioner" is disclosed in Japanese Patent Application Laid-Open No. 8-226683. FIG. 9 is a block diagram showing a schematic configuration of the "heat storage type refrigerating air conditioner". Filling 9 "regenerative refrigeration air conditioning system" is the air conditioning unit 110 for indoor cooling and heating of the store, the refrigeration unit 120 to coercive <br/>-cooling showcases scan, the heat storage tank 130 (heat storage medium, such as water The units 110 and 120 are thermally connected to each other via the heat storage tank 130 to cool and heat the room and keep the showcase cold.

Further, as shown in FIG. 9, the air conditioning unit 110 includes a first compressor 111, a first outdoor heat exchanger 112,
The indoor heat exchanger 113, the first expansion device 114a, the second expansion device 114b, four three-way valves 115a to 115d, three check valves 116a to 116c, two opening / closing valves 117a,
117b and the heat storage tank 130 described above are connected by piping.

On the other hand, the refrigerating unit 120 includes a second compressor 121, a second outdoor heat exchanger 122, a showcase cooler evaporator 123, a third expansion device 124a, a fourth expansion device 124b, and four three sides. The valves 125a to 125d, the three check valves 126a to 126c, the opening / closing valve 127a, and the heat storage tank 130 described above are connected by piping.

This "heat storage type refrigerating air conditioner" is configured as described above and has four three-way valves 115a to 115d and three check valves 116a to 116c of the air conditioning unit 110.
And two on-off valves 117a and 117b, and four three-way valves 125a to 125d of the refrigeration unit 120, three check valves 126a to 126c, and the on-off valve 127a, by selectively operating the cooling circuit. It is possible to intermittently switch between the heat storage circuit and the cold storage circuit and to circulate the refrigerant between the indoor unit and the heat storage tank at the same time.

As a result, a heat source for indoor cooling and heating can be obtained from the outside air through the first outdoor heat exchanger 112 or can be obtained from the heat storage tank 130, and a heat source for keeping cold of the showcase can be obtained from the heat storage tank 130. Therefore, it is possible to optimally perform cooling / heating and keep cold of the showcase in accordance with changes in the cooling / heating load and the showcase load. In addition, since heat exchange is performed between the air conditioning unit 110 and the refrigeration unit 120 via the heat storage tank 130, the required capacity of the air conditioner and the refrigerator can be reduced, and the running cost can be reduced. .

[0008]

However, the "heat storage type refrigerating air conditioner" disclosed in Japanese Unexamined Patent Publication No. 8-226683 described above is stored in the heat storage tank 130 by the surplus capacity of the heat source unit while processing the air conditioning load at night. When storing cold, heat storage tank 1
The amount of heat stored in 30 and the temperature of the heat storage material become low, and particularly when cold heat is stored as ice, even if an attempt is made to operate cooling and cold storage at the same time, the refrigerant circulates intensively in the higher temperature cooling circuit, There was a problem that I could not store cold.

Further, in this case, if the first expansion device 114a of the indoor unit is further narrowed down in order to allow the refrigerant to flow also to the heat storage tank 130 side, the evaporation temperature is lowered and the indoor heat exchanger is frosted, so that the air conditioner is cooled. There was a problem that the comfort of the room was significantly impaired due to a decrease in ability, a phenomenon in which water droplets of melted frost were scattered in the room, and the like.

Further, when the temperature of the heat storage material in the heat storage tank 130 is high, there is a problem that the refrigerant circulates intensively in the heat storage tank 130 so that the indoor unit cannot be cooled. Furthermore, there is a problem that no consideration is given to utilizing the surplus capacity of the heat source unit on the air conditioning side when the load on the freezing side is similar to that during the daytime even at night.

The present invention has been made in order to solve the above problems, and the cooling load of the heat exchanger on the use side such as a refrigerated showcase such as a convenience store is almost the same as that in the daytime even at night. Even in such a case, the excess capacity of the air conditioner is used to reduce the required capacity of the heat source unit, and stable heat storage is possible by adapting to the temperature of the heat storage material without impairing the comfort of air conditioning. The purpose is to obtain a heat storage type refrigeration air conditioner.

[0012]

[Means for Solving the Problems]
To achieve the object, in a heat storage type refrigerating air conditioner according to the present invention, a first compressor, a first heat source side heat exchanger, a first pressure reducer, a first utilization side heat exchanger, and A first cooling system having a first heat storage heat exchanger to form a first refrigeration cycle, a second compressor, a second heat source side heat exchanger,
The second decompressor, the second utilization side heat exchanger, and the second heat storage heat exchanger are included in the second refrigeration cycle to form the first refrigeration cycle .
Second cooling system for cooling a cooling target different from the cooling system of No. 3 , a third compressor, a third heat source side heat exchanger, and a third decompression
And a third utilization side heat exchanger, and a third refrigeration cycle
The same cooling target as the first cooling system.
A third cooling system, and a heat storage tank that stores cold heat and that includes the first heat storage heat exchanger and the second heat storage heat exchanger and is shared by the first and second cooling systems ; Record
The first cooling system separates the first utilization side heat exchanger from the refrigeration cycle of the first cooling system to provide the first cooling system.
Wherein the second cooling system is cold accumulating utilizing cooling luck with through the heat storage heat exchanger performs cold-storage operation <br/> to thermal storage into the thermal storage tank
In the low load operation mode in which the third cooling system performs a normal operation , the first heat storage heat exchanger is connected to the first cooling system.
The first and third cooling separated from the refrigeration cycle of
The system is a normal operation, the second cooling system is a cool storage utilization cooling operation.
It is characterized in that it is provided with an operation mode switching means for switching between the high load operation mode to be carried out and the operation mode.

According to the present invention, a convenience store
Such as the refrigeration showcase, etc.
If the load is almost the same at night,
In addition, the location of the heat source unit by utilizing the surplus capacity of the air conditioner
Along with reducing the required capacity, the comfort of air conditioning will not be impaired.
Storage that enables stable heat storage by adapting to the temperature of the heat storage material
A thermal refrigeration air conditioner can be obtained.

In a heat storage type refrigerating and air conditioning apparatus according to the next invention, in the above invention, the capacity of the third cooling system is
The amount of the cooling target load of the first and third cooling systems.
The first part of the cooling system, and the capacity of the first cooling system is
From the peak load of the cooling target load of the 1st and 3rd cooling systems
Select a capacity less the capacity of the third cooling system.
And are characterized. According to the invention, the volume of the second cooling system is
The amount is smaller than the capacity corresponding to the original processing capacity.
Large capacity is enough.

In the heat storage type refrigerating air conditioner according to the next invention, in the above invention, the first cooling system is
At least two first heat storage heat exchangers are provided, and the first heat storage heat exchangers are connected to each other in series or in parallel. According to this invention, the first cooling system is
Since it has at least two first heat storage heat exchangers,
A heat storage tank that can be shared with the second cooling system can be provided for each of these heat storage heat exchangers.

In the heat storage type refrigerating air conditioner according to the next invention, in the above invention, the second cooling system is:
It is characterized in that at least two second heat storage heat exchangers are provided and the second heat storage heat exchangers are connected in series or in parallel with each other. According to this invention, the second cooling system is
Since at least two second heat storage heat exchangers are provided,
For each of these heat storage heat exchangers, a heat storage tank that can be shared with the first cooling system can be provided.

In the heat storage type refrigerating air conditioner according to the next invention, in the above invention, at least two heat storage tanks are provided, and each of the heat storage tanks includes the first heat storage heat exchanger and the second heat storage heat exchanger. At least one heat storage heat exchanger is provided. According to the present invention, since at least two heat storage tanks that can be shared by the first cooling system and the second cooling system are provided, the cold heat accumulated by the first cooling system is stored in the plurality of heat storage tanks. Can be dispersed in.

A heat storage type refrigerating air conditioner according to the next invention is characterized in that, in the above invention, at least two second cooling systems are provided. According to the present invention, at least two second cooling units are provided for one first cooling system.
Since the cooling system is provided, the cold heat stored by the one first cooling system can be used in the plurality of second cooling systems.

A heat storage type refrigerating air conditioner according to the next invention is characterized in that, in the above invention, at least two first cooling systems are provided. According to the present invention, at least two first cooling systems are provided for one second cooling system.
Since the second cooling system is provided, the cold heat stored by the plurality of first cooling systems can be used in the second cooling system.

In the heat storage type refrigerating air conditioner according to the next invention, in the above invention, the first cooling system is
At least two first user-side configurations including the first pressure reducer and the first user-side heat exchanger are provided.
It is characterized in that the use side configurations of are connected in parallel with each other. According to the invention, even for the first pressure reducer and the first of the first cooling system of the first usage-side configuration comprising a usage-side heat exchanger are connected a plurality equipped with and parallel to each other, the The effect of the invention can be exerted.

In the heat storage type refrigerating air conditioner according to the next invention, in the above invention, the second cooling system is:
At least two second user-side configurations including the second pressure reducer and the second user-side heat exchanger are provided.
It is characterized in that the use side configurations of are connected in parallel with each other. According to the present invention, the above is also applied to the second cooling system which is provided with a plurality of second utilization side configurations including the second pressure reducer and the second utilization side heat exchanger and which are connected in parallel with each other. The effect of the invention can be exerted.

In a heat storage type refrigerating and air-conditioning apparatus according to the next invention, in the above invention, the first heat exchanger on the utilization side is used.
The exchanger and the third use-side heat exchanger share a fin.
Characterized in that that. According to this invention, the first user side
A fin is shared between the heat exchanger and the third user side heat exchanger.
Since it has, only one of the use side heat exchangers
Even when used, the heat transfer area on the air side increases and the
The efficiency of the crew is improved.

In the heat storage type refrigerating air conditioner according to the next invention, in the above invention, the first and third cooling systems perform the cooling operation by the first and third utilization side heat exchangers. It is characterized by having a four-way valve for switching to cooling operation or heating operation. According to the present invention, since the first and third cooling systems are provided with the four-way valve that enables switching between cooling and heating, cooling operation and heating are performed by the use side heat exchangers of the first and third cooling systems. You can drive. Heat storage type refrigeration according to the next invention
In the air conditioner, the first compressor, the first heat source side heat exchange
The exchanger, the first decompressor, and the first use-side heat exchanger are annularly arranged in sequence.
And the first heat storage heat exchanger that stores cold heat in the heat storage tank
Parallel / series connection switching for the first heat exchanger on the use side
The first refrigeration cycle can be configured by connecting as much as possible, and at night
The heat storage cooling operation, the air conditioning system that is air-conditioned during the day, and the second
The compressor, the second heat source side heat exchanger, and the cold heat of the heat storage tank.
Second heat storage heat exchanger, second pressure reducer, second utilization
The second refrigeration cycle by sequentially connecting the heat exchangers on the working side in an annular shape
A refrigerator that uses heat storage for cooling operation both day and night
Is a refrigeration system, a third compressor, a third heat source side heat exchanger,
The third decompressor and the third heat exchanger on the use side are sequentially made into a ring
Connected to form the third refrigeration cycle, air conditioning both day and night
And a third cooling system to be operated.
It According to this invention, like a convenience store
The cooling load of the heat exchanger on the use side such as a refrigerated showcase is at night
Even if it is almost the same as during the daytime,
Of the required capacity of the heat source machine by utilizing the surplus capacity of the machine
Heat storage material without reducing the comfort of air conditioning while reducing
Storage type refrigeration that adapts to the temperature of the tank and enables stable heat storage
An air conditioner can be obtained. Heat storage according to the next invention
In the above invention, there is provided a fourth type refrigeration air conditioning system.
Compressor, fourth heat source side heat exchanger, fourth pressure reducer, and
Fourth freezing by sequentially connecting the fourth heat exchanger on the utilization side in an annular shape
Configure a cycle and cooperate with the refrigeration or freezing system
A fourth cooling system is provided. According to this invention
This will increase the cooling capacity of the refrigeration or freezing system.
Wear.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a heat storage type refrigerating and air-conditioning apparatus according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1. First, the heat storage type refrigerating air conditioner according to the first embodiment will be described. The heat storage type refrigerating air conditioner according to the first embodiment is shared by both the first cooling system and the second cooling system that cools a cooling target (cooling load) different from the first cooling system. And a heat storage tank that is configured to include a heat storage tank, and in particular, according to the operating time zone and cooling load of both cooling systems, a normal cooling operation that does not use the heat storage tank, a heat storage cooling operation that stores heat in the heat storage tank, and It performs operations such as cooling operation using heat storage that uses the cold heat of the heat storage tank.

In the first embodiment and other subsequent embodiments, the first cooling system described above is an air conditioning system that enables cooling and heating of the room, and the second cooling system described above is a food product. Will be described as a refrigerating system or a refrigerating system that cools the inside of a showcase or the like.

FIG. 1 is a block diagram showing a schematic structure of a heat storage type refrigerating and air conditioning apparatus according to the first embodiment. The heat storage type refrigerating air-conditioning apparatus shown in FIG. 1 has a compressor 11, a four-way flow path switching valve 19 and an outdoor heat exchanger 12 as a first cooling system.
An outdoor unit U11 having an air conditioner and an indoor unit U12 having a decompression device 13 and a heat exchanger 14 on the use side, and a first vapor compression system that is an air conditioning system by sequentially connecting these components in an annular shape. A refrigeration cycle is constructed. Here, the indoor unit U12 is used for air conditioning of supermarkets, food stores, stores such as convenience stores that have refrigerated and frozen showcases, and the like.

Further, in this first vapor compression refrigeration cycle configuration, the on-off valves V11a and V11 connected in parallel with each other between the outdoor heat exchanger 12 and the pressure reducing device 13.
11b is provided, and two heat storage heat exchangers 16a are further provided.
And 16b are provided. Further, one end of the heat storage heat exchanger 16a is connected between the outdoor heat exchanger 12 and the on-off valve V11a via the pressure reducing device 15, and the other end is connected to the on-off valves connected in parallel. V12
a and V13a. Here, the on-off valve V
On the other hand, 12a is connected between the four-way flow path switching valve 19 and the use side heat exchanger 14, and has an opening / closing valve V13a.
On the other hand, is connected between the on-off valve V11a and the pressure reducing device 13.

Similarly, one end of the heat storage heat exchanger 16b is also connected via the pressure reducing device 15 between the outdoor heat exchanger 12 and the on-off valve V11b described above, and the other ends thereof are parallel to each other. Open / close valves V12b and V1 connected
It is connected to 3b. On the other hand, the on-off valve V12b is connected between the four-way passage switching valve 19 and the utilization side heat exchanger 14 on the other hand, and the on-off valve V13b on the other hand connects the on-off valve V11b and the pressure reducing device 13 to each other. Is connected in between.

On the other hand, the heat storage type refrigerating air conditioner shown in FIG.
As the second cooling system, the compressor 21 and the outdoor heat exchanger 2
2, an outdoor unit U21, an indoor unit U22 having a decompression device 23 and a use side heat exchanger 24, and heat storage heat exchangers 26a and 26b connected in parallel with each other.
And a second vapor compression refrigeration cycle, which is a refrigeration system or a refrigeration system, is configured by sequentially connecting these constituent elements in an annular shape.

Here, the indoor unit U22 is installed in a refrigerating or freezing showcase such as a supermarket, a food store, or a convenience store.
When the low-temperature low-pressure two-phase refrigerant is vaporized and gasified in the use-side heat exchanger 24, the air in the showcase is cooled to allow the food to be cooled or frozen.

Specifically, the heat storage heat exchanger 26a includes an outdoor heat exchanger 22 and a pressure reducing device 23 via a pressure reducing device 25a.
And a heat storage heat exchanger 26b.
Is connected in series between the outdoor heat exchanger 22 and the pressure reducing device 23 via the pressure reducing device 25b. And this heat storage type refrigerating air-conditioning system is equipped with two heat storage tanks 90 for storing cold heat.
a and 90b, the heat storage tank 90a has the above-mentioned heat storage heat exchangers 16a and 26a installed therein, and the heat storage tank 90b has therein the above-mentioned heat storage heat exchangers 16b and 2b.
6b is installed. That is, the first cooling system and the second cooling system share the heat storage tanks 90a and 90b, respectively. Therefore, in the heat storage type refrigerating and air conditioning apparatus according to the first embodiment, as shown in FIG. 1, the portions distinguished by the configurations 10a and 10b are connected in parallel with each other.

In the heat storage tanks 90a and 90b,
Water, an ethylene glycol aqueous solution, a propylene glycol aqueous solution, a quaternary ammonium salt aqueous solution, a mixed solution of silicon oil and water, etc. are mainly contained as a heat storage material for storing cold heat.

Next, the operation of this heat storage type refrigerating and air conditioning system will be described. In particular, the heat storage type refrigerating air conditioner according to the first embodiment has two operation modes of normal operation or cool storage operation in the first cooling system, and operation mode of cool storage utilizing cooling operation in the second cooling system. In addition, switching between these operation modes is performed during the cooling period night (low load time period), cooling period daytime (high load time period), heating period night (low load time period), heating period daytime (high load time period). ) Are classified into four patterns.

In the following, the operation based on the above operation mode will be described by dividing it into the above four patterns.
In addition, the heat storage type refrigerating air conditioner according to the present invention can obtain the effects as will be described later by itself.
In one of the patterns, in addition to the heat storage type refrigeration air conditioner according to the present invention, a refrigeration cycle of an air conditioning system similar to the first cooling system is independently configured and the first cooling A third cooling system having the same system and cooling target, or a refrigeration cycle of a refrigeration system or a refrigeration system similar to the second cooling system is independently configured, and the second cooling system and the cooling target are A greater effect can be obtained by cooperation with the same fourth cooling system.

FIG. 2 shows the third cooling system and the fourth cooling system described above.
It is an explanatory view for explaining the configuration of the cooling system. In particular,
FIG. 2A shows a configuration example of the third cooling system, which includes an outdoor unit U31 having a compressor 31, a four-way flow path switching valve 39 and an outdoor heat exchanger 32, a pressure reducing device 33 and a use side. An indoor unit U32 having a heat exchanger 34,
And a vapor compression refrigeration cycle, which is an air conditioning system, is configured by sequentially connecting these components annularly.

FIG. 2B shows an example of the construction of the fourth cooling system, which includes an outdoor unit U41 having a compressor 41 and an outdoor heat exchanger 42, a decompression device 43 and a heat exchange on the use side. And a utilization side unit U42 having a container 44, and these components are sequentially connected in an annular fashion to configure a vapor compression refrigeration cycle that is a refrigeration system or a refrigeration system.

(Cooling Night Operation) First, the cooling night operation (low load time zone) will be described. In the cooling night operation, the first cooling system does not contribute to the cooling in the room but performs the operation for accumulating the heat in the heat storage tanks 90a and 90b, and the above-described third cooling system causes the cooling in the room. While doing all of the above, the second cooling system
The cooling operation using the cold heat stored in the heat storage tanks 90a and 90b is performed.

In the first cooling system, the on-off valves V11a and V13 are used to perform the operation for the night during the cooling period.
a, V11b and V13b are closed, and the on-off valves V12a and V12b are opened. That is, by operating these opening / closing valves, the outdoor unit U11 and the heat storage heat exchangers 16a and 16b form a refrigeration cycle, and the indoor unit U12 is separated from the refrigeration cycle.

With this connection configuration, the gas refrigerant compressed in the compressor 11 and having a high temperature and high pressure flows to the outdoor heat exchanger 12 by the four-way flow path switching valve 19 and radiates heat to the outside air in the outdoor heat exchanger 12. Condensed and liquefied. Thereafter, the liquid refrigerant branches to the pressure reducing devices 15a and 15b, respectively, and becomes a low-temperature low-pressure two-phase refrigerant by the pressure reducing devices 15a and 15b. And this refrigerant is heat storage heat exchange
Heat is absorbed from the surrounding heat storage material via the vessels 16a and 16b to be vaporized and gasified, and the on-off valves V12a and V1 are respectively provided.
After passing through 2b, they merge and return to the compressor 11 via the four-way flow path switching valve 19.

The decompression devices 15a and 15b automatically adjust their opening so that the superheat degree of the refrigerant on the outlet side of the heat storage heat exchangers 16a and 16b becomes a target value. Thereby, the refrigerant flow rate is controlled according to the load state in the heat storage heat exchangers 16a and 16b, that is, the temperature of the cold storage material and the amount of heat storage. In this way, the heat storage heat exchanger 16
Operate both a and 16b as evaporators (cold storage operation)
Then, cold heat is stored in the heat storage tanks 90a and 90b.

On the other hand, in the second cooling system, the compressor 2
The gas refrigerant that has been compressed in 1 to have high temperature and high pressure radiates heat to the outside air in the outdoor heat exchanger 22 to be condensed and liquefied, and then the decompression device 2
5a and 25b, respectively, and these two pressure reducing devices 25a and 25b form a low-temperature low-pressure two-phase refrigerant. Then, this refrigerant is stored in the heat storage heat exchangers 26a and 2a.
It is further cooled by the cold heat stored in the heat storage tanks 90a and 90b via 6b. After being merged, the supercooled liquid refrigerant becomes a low-temperature low-pressure two-phase refrigerant in the decompression device 23, which absorbs heat from the surrounding air in the utilization side heat exchanger 24 to be evaporated and gasified, and then returns to the compressor 21.

Incidentally, the decompressor 25a and 25b, the opening degree as the subcooling degree of the refrigerant on the outlet side of the usage-side heat exchanger 24 becomes the target value is automatically adjusted, thereby, heat storage heat
The amount of heat collected in the exchangers 26a and 26b is controlled.

Further, the pressure reducing device 23 is the heat exchanger 2 on the utilization side.
The opening degree is automatically adjusted so that the degree of superheat of the refrigerant on the outlet side of No. 4 becomes a target value, whereby the refrigerant flow rate is controlled to a flow rate according to the cooling load state in the use side heat exchanger 24.

By such control, the ratio between the heat radiation amount in the outdoor heat exchanger 22 and the heat radiation amount in the heat storage heat exchangers 26a and 26b is appropriately set according to the cooling load in the use side heat exchanger 24. It is possible to use the heat storage too much and use the heat exchanger 2 in the evening (high load time end time) in the evening.
The problem of being unable to handle the cooling load in No. 4 has been solved.

Therefore, the second cooling system is used by performing a cooling operation (cooling-utilizing cooling operation) while utilizing a part of the cold heat stored in the first cooling system in the heat storage tanks 90a and 90b. The cooling load of the side heat exchanger 24 is processed to cool and store the food.

On the other hand, in the third cooling system, the gas refrigerant that has been compressed by the compressor 31 and has become high temperature and high pressure flows to the outdoor heat exchanger 32 by the four-way flow path switching valve 39, and the outside air is exchanged in the outdoor heat exchanger 32. After the heat is radiated to and condensed and liquefied, the decompression device 3
At 3, the low-temperature low-pressure two-phase refrigerant is obtained, which absorbs heat from the surrounding air in the use-side heat exchanger 34 to be vaporized and gasified, and returns to the first compressor 31 via the four-way flow path switching valve 39.

Due to this flow of the refrigerant, the indoor unit U3
2 can cool the indoor air when the low-temperature low-pressure two-phase refrigerant is vaporized and gasified by the use-side heat exchanger 34. Further, the decompression device 33 automatically adjusts the opening degree of the refrigerant on the outlet side of the utilization side heat exchanger 34 so that the degree of superheat of the refrigerant becomes a target value. As a result, the refrigerant flow rate is controlled according to the cooling load state in the use side heat exchanger 34. In this way, the third cooling system processes all the cooling and air conditioning loads of the store at night (low load time zone).

Here, the object to be cooled may be operated in parallel by the fourth cooling system which is the same as the second cooling system. That is, the fourth cooling system of the indoor unit U42 shown in FIG. 2 (b), the second cooling system of the indoor unit U 22
In addition, it is a case where they are installed in the same showcase, whereby the cooling capacity by refrigeration or freezing in the showcase can be enhanced.

In this case, in the fourth cooling system, the compressor 41
The gas refrigerant that has been compressed to high temperature and high pressure in the outdoor heat exchanger 42 radiates heat to the outside air to be condensed and liquefied, and then the decompression device 43.
Becomes a low-temperature low-pressure two-phase refrigerant, absorbs heat from the surrounding air in the use-side heat exchanger 44, evaporates into gas, and returns to the compressor 41. Here, the decompression device 43 can automatically adjust the opening degree thereof so that the superheat degree of the refrigerant on the outlet side of the utilization side heat exchanger 44 becomes a target value. Thereby, the refrigerant flow rate can be controlled according to the cooling load state in the utilization side heat exchanger 44.

Therefore, in the cooling night operation described above, since the cooling capacity of the use side heat exchanger 24 is increased by the amount of the refrigerant supercooled in the heat storage heat exchangers 26a and 26b, the use side heat exchange at night. Even if the cooling load in the device 24 is equal to that in the daytime, the capacity of the heat source device, that is, the capacities of the compressor 21 and the outdoor heat exchanger 22 can be reduced.

(Cooling Daytime Operation) Next, the cooling daytime operation (high load time zone) will be described. In the daytime operation in the cooling period, the heat storage type refrigeration air conditioner according to the first embodiment cools the room indoors together with the third cooling system described above, without contributing to the cold heat accumulation in the heat storage tanks 90a and 90b. The second cooling system performs the cooling operation using the cold storage described above.

In the first cooling system, the opening / closing valves V12a and V13 are used to perform the operation for the cooling daytime.
a, V12b and V13b are closed, open / close valves V11a and V11b are opened, and pressure reducing devices 15a and 1
Fully close 5b. That is, by operating the opening / closing valve and the pressure reducing device, the outdoor unit U11 and the indoor unit U12 form a refrigeration cycle, and the heat storage heat exchangers 16a and 16b are separated from the refrigeration cycle.

With this connection configuration, the first cooling system is
The normal cooling operation like the above-described third cooling system is performed to process the remaining air conditioning load that could not be completely processed in the refrigeration cycle of the third cooling system.

On the other hand, in the second cooling system, the refrigerant condensed and liquefied in the outdoor heat exchanger 22 is stored in the heat storage heat exchanger 26.
It is supercooled by flowing it to a and 26b, and is made into a low-pressure two-phase refrigerant in the decompression device 23 to process the cooling load in the utilization side heat exchanger 24.

Further, the decompression devices 25a and 25b automatically open their openings so that the degree of supercooling of the refrigerant on the outlet side of the heat storage heat exchangers 26a and 26b becomes a target value, as in the night time (low load time zone). Heat storage heat exchanger 1 by adjusting
The amount of heat collected in 6a and 16b is controlled to prevent excessive use of heat storage.

The third cooling system is the outdoor heat exchanger 3
2 is a condenser, and the use side heat exchanger 34 is an evaporator, and a part of the cooling and air conditioning load of the store in the daytime (high load time zone) is processed. Further, as described above, the fourth cooling system can be introduced.

[0058] Thus, in the cooling phase daytime operation described above, the heat storage tank 90a and 90b, which are shared by the amount of refrigerant is supercooled through a heat storage heat exchanger 26 a and 26 b the use side heat exchanger Since the cooling capacity at 24 increases, the capacity of the heat source machine, that is, the capacity of the compressor 21 and the outdoor heat exchanger 22 can be reduced.

(Heating Night Night Operation) Next, the heating night operation (low load time zone) will be described. In the heating period night operation, in the first cooling system and the third cooling system, the same connection form and operation as those in the cooling period night operation described above are applied except that the cooling operation is switched to the heating operation. .

Therefore, in order to perform the night operation in the heating period, first, in the first cooling system, by operating the opening / closing valve, the connection form is made the same as that in the night in the cooling period, and the utilization side heat exchanger 14 is connected to the condenser. the chamber outside heat exchanger 12 as an evaporator, by storing cold energy in the thermal storage tank 90a and 90b,
Perform cold storage operation.

On the other hand, the second cooling system is also supercooled by causing the refrigerant condensed and liquefied in the outdoor heat exchanger 22 to flow through the heat storage heat exchangers 26a and 26b, as in the cooling night, and the low pressure is reduced by the pressure reducing device 23. A cooling storage utilization cooling operation is performed by treating the cooling load of the utilization side heat exchanger 24 with a two-phase refrigerant.

Further, in the third cooling system, the four-way flow passage switching valve 39 is switched in the reverse of the cooling period, and the utilization side heat exchanger 3
By using 4 as a condenser and the outdoor heat exchanger 32 as an evaporator, all heating and air conditioning loads at night are processed. In addition, you may introduce a 4th cooling system like the case of the cooling period night operation. However, during the heating period, since the ambient air temperature is originally reduced, the cooling load of the second cooling system use-side heat exchanger 44 and the second cooling system use-side heat exchanger 24 is It is considered to be sufficiently smaller than the period, but in the sense that it can respond to sudden temperature changes and keep a constant temperature,
There is an advantage to introducing the cooling system.

Therefore, in the nighttime operation during the heating period described above, the cooling capacity of the use side heat exchanger 24 is increased by the amount of the refrigerant supercooled in the heat storage heat exchangers 26a and 26b, so that the use side heat exchange at night is performed. Even when the cooling load in the device 24 is the same as that in the daytime and does not change, the capacity of the heat source device, that is, the capacities of the compressor 21 and the outdoor heat exchanger 22 can be reduced at the initial design of the device.

(Daytime operation during heating period) Next, operation during daytime during the heating period (high load time zone) will be described. In the heating period daytime operation, in the first cooling system and the third cooling system, the same connection form and operation as those in the cooling period daytime operation described above are applied, except that the cooling operation is switched to the heating operation. .

Therefore, in order to perform the heating period daytime operation, first, in the first cooling system, the opening / closing valve is operated to make a connection similar to that in the cooling period daytime, and the four-way flow path switching valve 19 is set in the cooling period. Switching to the opposite of the above, and using the heat exchanger 14 on the use side as a condenser and the outdoor heat exchanger 12 as an evaporator, normal heating operation is performed, and processing is completed in the refrigeration cycle of the third cooling system described later. Process the remaining air conditioning load that did not exist.

On the other hand, also in the second cooling system, as in the cooling daytime, the refrigerant condensed and liquefied in the outdoor heat exchanger 22 is supercooled by flowing into the heat storage heat exchangers 26a and 26b, and the low pressure is reduced by the pressure reducing device 23. A cooling storage utilization cooling operation is performed by treating the cooling load of the utilization side heat exchanger 24 with a two-phase refrigerant.

Further, in the third cooling system, the four-way flow passage switching valve 39 is switched in the reverse of the cooling period, and the utilization side heat exchanger 3
By using 4 as a condenser and the outdoor heat exchanger 32 as an evaporator, a part of the heating and air conditioning load of the store in the daytime (high load time zone) is processed. In addition, the fourth cooling system described above may be introduced here.

Therefore, in the heating daytime operation described above, since the cooling capacity of the use side heat exchanger 24 increases by the amount of the refrigerant supercooled in the heat storage heat exchangers 26a and 26b, the capacity of the heat source unit, that is, it is possible to reduce the capacity of the compressor 21 and the outdoor heat exchanger 2 2.

As described above, the cooling season night, the cooling season daytime,
By switching the operation mode of the first cooling system in accordance with the four periods during the heating period night and during the heating period daytime, the heat source unit of the air conditioning system that does not need to be air-conditioned at night is operated, and inexpensive heat storage power at night is stored. It is possible to reduce the heat source capacity of the refrigerating or freezing system that does not reduce the load even at night, so the basic electricity charge depends on the capacity of the heat source equipment, and the power that depends on the actual power consumption. It is possible to reduce the weight charge together.

Further, by using the same heat storage tanks 90a and 90b structurally, the heat storage tank unit can be standardized, an inexpensive heat storage cooling device can be obtained, and the heat storage tank unit can be reused easily. Become.

Further, in the above-mentioned first cooling system, it is possible to switch between the two operation modes of the normal operation (cooling or heating) and the cold storage operation, but further, while performing the cooling or heating operation, the heat storage tank 90a and It is also possible to perform the heat storage utilization cooling operation using the heat storage of 90b.

In particular, in the above-mentioned daytime operation during the cooling period and daytime operation during the heating period, it is assumed that all the cold heat stored in the heat storage tanks 90a and 90b is used in the second cooling system. It is advantageous to utilize a part of the heat storage in the tanks 90a and 90b also in the first cooling system. The smaller the air conditioning load in the daytime period, or the smaller the refrigeration or freezing load in the second cooling system, the more the amount of heat stored in the heat storage tanks 90a and 90b stored by the first cooling system becomes, The first cooling system can process a part of the cooling load in the daytime (high load time zone) by using this heat storage.

In the first cooling system, in order to perform the heat storage utilizing cooling operation, the pressure reducing devices 15a and 15b are fully opened, and the opening / closing valves V11a, V12a, V11b and V12.
b is closed and the on-off valves V13a and V13b are opened. At this time, the heat storage heat exchangers 16a and 16b are connected in series with the outdoor heat exchanger 12 and the utilization side heat exchanger 14, respectively.

With this connection configuration, the gas refrigerant compressed in the compressor 11 and having high temperature and high pressure radiates heat to the outside air in the outdoor heat exchanger 12 to be condensed and liquefied, and the decompression devices 15a and 15a.
After passing through b, the heat storage heat exchangers 16a and 16b further radiate heat to the surrounding low temperature heat storage material, and after supercooling, the pressure reducing device 13 becomes a low temperature and low pressure two-phase refrigerant, and the use side heat exchanger 14
At the same time, heat is absorbed from the surrounding air to be vaporized and gas is returned to the compressor 11.

At this time, the heat storage heat exchangers 16a and 16
Since the cooling capacity of the use side heat exchanger 14 is increased by the amount of supercooling of the refrigerant in b, the second outdoor unit U of the second cooling system is compared with the case of only the normal cooling operation or the heating operation.
Not only the capacity of 21, but also the outdoor unit U of the first cooling system
11, the capacity of the compressor 11 and the outdoor heat exchanger 1
The capacity of 2 can be reduced. Therefore, the basic electric power charge determined by the capacity of the heat source device and the electric power weight charge determined by the actual power consumption can be further reduced.

Next, the capacity of the outdoor unit in each cooling system of the first embodiment will be described. Third and fourth
The cooling system of the outdoor units U31 and U4 is the same as the conventional one, depending on the capacity to be processed by the use side heat exchangers 34 and 44.
Select 1. In particular, the capacity to be processed by the third cooling system is selected according to the maximum value of the nighttime air conditioning load of the target 24-hour store such as a convenience store.

On the other hand, the first cooling system is the outdoor unit U11 according to the capacity to be processed by the remaining utilization side heat exchanger 14 after subtracting the capacity that the third cooling system can process from the peak load during the cooling period daytime. Is selected. Then, for the second cooling system, the capacity of the outdoor unit may be smaller than the capacity to be processed by the utilization side heat exchanger 24.

Here, the relationship between the outdoor unit capacities of the first, second and third cooling systems will be described. FIG. 3 is an explanatory diagram for explaining the relationship between the cooling loads of the first and third cooling systems and time, and the relationship between the cooling loads of the second cooling system and time. In FIG. 3, as an example, FIG. 3A shows a temporal change of the cooling load of the air conditioning systems in the first and third cooling systems for one day, and FIG. 3B shows refrigeration in the second cooling system. The time change of the cooling load of the refrigeration system in one day is shown.

In FIG. 3A and FIG. 3B, the area A
+ B indicates the heat storage amount stored in the heat storage tanks 90a and 90b by the above-described cold storage operation in the first cooling system,
Of these, regions A and B represent the heat storage amounts used in the nighttime and daytime in the second cooling system, respectively.
Area C indicates the cooling load processed by the first cooling system, and area D indicates the cooling load processed by the third cooling system. Here, it can be seen that the third cooling system processes the heat quantity of the base portion of the air conditioning load for one day. The area E indicates the cooling load originally processed by the second cooling system.

Therefore, as can be understood from FIG.
The outdoor unit U21 of the second cooling system may have a capacity smaller than the capacity corresponding to the capacity to be processed by the use side heat exchanger 24, usually 75-80%.

In the present embodiment, in both the cooling period and the heating period, the high load time zone is daytime and the low load time zone is nighttime.
If there are few customers in the store at the time of cloudy weather, etc.),
During the time period, the cold storage operation may be performed in the first cooling system.

In this case, the magnitude of the air conditioning load can be detected by any of the following methods, for example. (1) It is detected that the capacity of the compressor 11 of the first cooling system has become equal to or less than a predetermined amount (for example, 25%). (2) It is detected that the total compressor capacity of the first and third cooling systems has become equal to or less than the maximum capacity of the compressor 11. (3) In the use side heat exchangers of the first and third cooling systems, the difference between the set intake air temperature and the actually detected intake air temperature is a predetermined value (for example, 1
℃) is detected below. (4) It is detected that the rotation speed or the air volume of the blower of the use side heat exchangers of the first and third cooling systems has become equal to or less than a predetermined amount. (5) It is detected that the evaporation temperature, the evaporation pressure, or the suction pressure of the first cooling system has become equal to or lower than a predetermined value.

If the heat storage heat exchangers 26a and 26b are properly designed, the pressure reducing devices 15a and 15b will be used.
Can be omitted. The reason for this is that by using too much heat storage in the second cooling system, a situation in which the cold heat in the heat storage tanks 90a and 90b becomes insufficient near the end of the cool storage use time zone and the load cannot be completely processed does not occur. Because. In particular, when the second cooling system is a refrigeration system that originally has a small load, the heat storage side pressure reducing devices 15a and 15b may be omitted.

Furthermore, in the present embodiment, the case where the first and third cooling systems are systems for processing an air conditioning load has been described as an example, but the present invention is not limited to air conditioning, and for example, cooling of a manufacturing process of a factory or the like. But it doesn't matter.

As described above, according to the heat storage type refrigerating and air-conditioning apparatus according to the first embodiment, the four-way flow path switching valve 19, the compressor 11, the outdoor heat exchanger (heat source side heat exchanger) 1
2, the first cooling system that has the decompression device 13, the use-side heat exchanger 14, and the heat storage heat exchangers 16a and 16b to form an air conditioning system, the compressor 21, the outdoor heat exchanger (heat source side heat exchanger) ) 22, a decompression device 23, the usage-side heat exchanger 24, stores a second cooling system which constitutes a cooling system or frozen strains have connected蓄 heat exchanger 26a and 26b in parallel to each other, the cold A heat storage tank 90a that includes the heat storage heat exchanger 16a and the heat storage heat exchanger 26a and is shared by the first and second cooling systems, and a heat storage heat exchanger 16b and a heat storage heat exchanger 26b that store cold heat And a heat storage tank 90 shared by the first and second cooling systems
b, and on-off valves V11a, V12a, V13a,
By operating V11b, V12b, V13b and the four-way flow path switching valve 19, the heat storage heat exchangers 16a and 16b.
Is separated from the first cooling system so that the first cooling system performs a cooling operation only by the use side heat exchanger 14 and a normal cooling or heating operation, and the use side heat exchanger 14 is separated from the first cooling system. Heat storage heat exchangers 16a and 1 by separating
Cooling operation in which heat is stored in the heat storage tanks 90a and 90b via 6b, and further cooling operation by the use side heat exchanger 14 by connecting each of the heat storage tanks 90a and 90b in series to the use side heat exchanger 14. And the cooling capacity of the heat exchanger 14 on the use side is stored in the heat storage tank 90.
Since it is possible to switch between the three operation modes of the cold storage utilization cooling operation that increases according to the amount of supercooling in a and 90b, this exercise mode switching is performed first.
By carrying out according to the use time zone of the cooling system, the heat storage in the heat storage tank using the surplus capacity of the heat source machine of the first cooling system and the heat storage by the second cooling system can be efficiently used. The heat source unit capacity of the refrigerating or freezing system, which is the second cooling system, can be reduced, and thus the electric power charge determined by the capacity and the amount of use of the heat source unit can be reduced.

Further, in the heat storage type refrigerating air conditioner according to the first embodiment and other embodiments described below,
By making a plurality of shared heat storage tanks (here, the heat storage tanks 90a and 90b) have the same specifications, it is possible to easily reuse the heat storage tanks when they are discarded. In the first embodiment, the case where the number of heat storage tanks is two has been described, but the same idea can be applied to the case where there are three or more heat storage tanks, and this is the same in other embodiments described below.

Embodiment 2. Next, a heat storage type refrigerating air conditioner according to the second embodiment will be described. In the heat storage type refrigerating and air-conditioning apparatus according to the first embodiment, two heat storage tanks 90a and 90b are connected in parallel to each other when the above-described cold storage operation or cooling operation using cold storage is performed, and this parallel connected configuration is used as an outdoor unit. U11 and U21 are connected in series, but in the heat storage type refrigerating air conditioner according to the second embodiment, two heat storage tanks 90 are used in the same operation mode.
a and 90b are connected in series with each other, and this series-connected configuration is further connected in series with each of the outdoor units U11 and U21.

FIG. 4 is a block diagram showing a schematic structure of a heat storage type refrigerating air conditioner according to the second embodiment. In addition, in FIG. 4, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. In the heat storage type refrigerating air conditioner shown in FIG. 4, on-off valves V11a and V11b are connected in series between the outdoor heat exchanger 12 and the use side heat exchanger 14.

One end of the heat storage heat exchanger 16a is connected to the outdoor heat exchanger 12 and the on-off valve V11a via the pressure reducing device 15a.
And the other end of the heat storage heat exchanger 16a via the on-off valve V12a. The other end of the heat storage heat exchanger 16a is connected via the on- off valve V12a.
Then, it is connected between the utilization side heat exchanger 14 and the four-way flow path switching valve 19. Further, one end of the heat storage heat exchanger 16b is connected to the opening / closing valve V13a and the opening / closing valve V1 via the pressure reducing device 15b.
1b, the other end is connected between the on-off valve V11b and the pressure reducing device 13 via the on-off valve V13b,
Further, the other end of the heat storage heat exchanger 16b is provided with an opening / closing valve V12b.
It is connected via between the utilization side heat exchanger 14 and the four-way flow path switching valve 19.

On the other hand, one end of the heat storage heat exchanger 26a is connected to the outdoor heat exchanger 22 via the pressure reducing device 25a, and the other end is connected to one end of the heat storage heat exchanger 26b via the pressure reducing device 25b. The other end of the heat exchanger 26b is connected to the pressure reducing device 23. Therefore, the heat storage type refrigerating air conditioner according to the second embodiment has a configuration 10a as shown in FIG.
And 10b are respectively connected in series with each other.

Next, the operation of the heat storage type refrigerating and air conditioning apparatus according to the second embodiment will be described. In addition, also in the second embodiment, the third and fourth cooling systems described in the first embodiment can be introduced, and the same effect can be obtained. Therefore, here, the third and fourth cooling systems are used. A description of the operation of the system is omitted.

Further, the operation mode selection and the operation of the on-off valve and the like associated with each of the above-described cooling period night operation, cooling period daytime operation, heating period nighttime operation, and heating period daytime operation are also the same as in the first embodiment. Therefore, their explanations are omitted here.

Further, in the heat storage type refrigerating air conditioner according to the second embodiment, as in the first embodiment, the pressure reducing devices 25a and 25b are replaced by the heat storage heat exchangers 26a and 26.
The opening degree is automatically adjusted so that the degree of supercooling of the refrigerant on the outlet side of b is set to a predetermined target value.
Although it is possible to control the amount of collected heat in a and 26b, in particular, the target value of the degree of supercooling is that the heat storage heat exchanger 26a on the upstream side and the heat storage heat exchanger 26b on the downstream side have the same refrigerant heat quantity. It is desirable that it is set to be cooled to.

For example, temperature sensors S11a, S12a, S11b and S12b arranged as shown in FIG.
When the detected values of T1a, T52a, T51b and T52b are respectively set to SC1 = T51a-T52a and SC2 = T51b-T52b, the respective target values of these calculated values SC1 and SC2 are set to 10 [deg]. Set. That is, the openings of the pressure reducing devices 25a and 25b are controlled so that the calculated values SC1 and SC2 approach their respective target values.

[0095] Alternatively, fully open or remove decompressor 25b, may be controlled to heat storage usage only under reduced equipment 2 5a. In this case, the target value detected value of the temperature sensor S 1 2b, for example, made to be 10 [° C.]. By doing so, the use side heat exchanger 24
In accordance with the cooling load in the outdoor heat exchanger 22, the ratio between the heat radiation amount in the outdoor heat exchanger 22 and the heat radiation amount in the heat storage heat exchangers 26a and 26b is appropriately controlled, and the heat storage 24 is used too much and the utilization side heat exchanger 24 It is possible to prevent a situation in which the cooling load in the above can not be processed.

In the configuration shown in FIG. 4, the two heat storage heat exchangers respectively provided on both the first cooling system side and the second cooling system side are connected in series.
Two heat storage heat exchangers on either side of the cooling system may be connected in parallel with each other as in the first embodiment.

As described above, according to the heat storage type refrigeration air conditioner of the second embodiment, in the structure of the heat storage type refrigeration air conditioner of the first embodiment, two heat storage heat exchanges of the first cooling system are performed. Since the heat exchangers 16a and 16b are connected in parallel with each other and the two heat storage heat exchangers 26a and 26b of the second cooling system are connected in parallel with each other, branching of the connection pipe when the parallel connection is adopted is unnecessary. The device configuration can be made relatively simple and inexpensive.

Further, since the installation constraint of the heat storage tank is further reduced, it becomes possible to use the heat storage even in a place where it was difficult to apply the heat storage, and it is possible to further contribute to the leveling of the electric power load.

Embodiment 3. Next, a heat storage type refrigerating air conditioner according to the third embodiment will be described. In the heat storage type refrigeration air conditioner according to the first and second embodiments, the configuration is shown in which the cold heat stored in the air conditioning system which is the first cooling system is used in one refrigeration system or the refrigeration system which is the second cooling system. However, in the heat storage type refrigeration air conditioner according to the third embodiment, a plurality of second cooling systems are provided, and a heat storage tank shared with the first cooling system is provided for each second cooling system. It has a feature.

FIG. 5 is a block diagram showing a schematic structure of a heat storage type refrigerating air conditioner according to the third embodiment. In FIG. 5, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In regenerative refrigeration air conditioning system shown in FIG. 5, different from the thermal storage type refrigerating air conditioner shown in FIG. 1, the installed heat storage heat exchanger 26a in the thermal storage tank 90a
And the heat storage heat exchanger 26b installed in the heat storage tank 90b are provided in separate second cooling systems.

In FIG. 5, one of the two second cooling systems (hereinafter referred to as the second cooling system A) is an outdoor unit U21a having a compressor 21a and an outdoor heat exchanger 22a. , Pressure reducing device 25a, and heat storage heat exchanger 26
a and an indoor unit U22a having a decompression device 23a and a use side heat exchanger 24a, and these components are sequentially connected in a ring to form a vapor compression refrigeration cycle that is a refrigeration system or a refrigeration system. is doing.

The outdoor unit U21b having the compressor 21b and the outdoor heat exchanger 22b is similarly used for the other of the two second cooling systems (hereinafter referred to as the second cooling system B). A decompression device 25b, a heat storage heat exchanger 26b, a decompression device 23b and a use side heat exchanger 24.
An indoor unit U22b having b is provided, and these components are sequentially connected in a ring to configure a vapor compression refrigeration cycle that is a refrigeration system or a refrigeration system.

That is, as shown in FIG. 5, the heat storage type refrigerating and air conditioning apparatus according to the third embodiment has the configurations 20a and 20b.
And, on the one hand, are connected to one first cooling system, and on the other hand,
It is separately connected to each of the second cooling system A and the second cooling system B.

In FIG. 5, the operation of the structure corresponding to the first cooling system is similar to that of the first embodiment, and
Also in the second cooling system A and the second cooling system B, the second cooling system in the first embodiment, respectively, is a set including the pressure reducing device 25a and the heat storage heat exchanger 26a, and the pressure reducing device 25b and the heat storage heat exchanger. This is the same as the mode in which only one of the group consisting of 26b is connected, and the operation is also the same. Therefore, the description of the operation of the heat storage type refrigerating and air-conditioning apparatus according to the third embodiment will be omitted. Further, as described in the first embodiment, the third cooling system and the fourth cooling system described above can be introduced in consideration of the operation of the heat storage type refrigerating and air-conditioning apparatus.

As described above, according to the heat storage type refrigerating air conditioner according to the third embodiment, the heat storage heat exchanger 2 provided in one second cooling system in the configuration shown in the first embodiment. 6 a and the pressure reducing device 2 5 a and a set of the heat storage heat exchanger 2 6 b and the pressure reducing device 2 5 b are distributed to the second cooling system A and the second cooling system B, respectively. Since it is installed, the effect of the first embodiment can be enjoyed, and the cold heat accumulated by the first cooling system can be used in all of the plurality of second cooling systems constituting the heat storage type refrigerating and air-conditioning apparatus. Therefore, the capacity of the heat source machine used in each second cooling system can be reduced.

Fourth Embodiment Next, a heat storage type refrigerating and air-conditioning apparatus according to the fourth embodiment will be described. In the heat storage type refrigerating air conditioner according to the third embodiment described above, a plurality of second cooling systems (refrigerating system or refrigerating system) that utilize cold storage are assumed to collect heat from separate heat storage tanks. If the cooling load on the use side of the second cooling system is not substantially the same, it is necessary to change the capacity of each heat storage tank according to the cooling load on the use side.
There is a problem in that the price of the apparatus configuration becomes expensive without standardization of the heat storage tank.

Therefore, the heat storage type refrigerating air conditioner according to the fourth embodiment is provided with a plurality of second cooling systems in order to cope with such a problem, and the first cooling system is provided for each second cooling system. Each of the second cooling systems includes a plurality of heat storage heat exchangers connected in parallel with each other, and each of the plurality of heat storage heat exchangers is provided in each heat storage tank. It is characterized by being distributed and installed in.

FIG. 6 is a block diagram showing a schematic structure of a heat storage type refrigerating air conditioner according to the fourth embodiment. The same parts as those in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. First, in FIG. 6, the second cooling system A includes an outdoor unit U21a having a compressor 21a and an outdoor heat exchanger 22a, a decompression device 25a1 and a heat storage heat exchanger 2.
6a1, decompression device 25a2, and heat storage heat exchanger 26a2
And an indoor unit U22a having a configuration in which the pressure reducing device 23a and a use side heat exchanger 24a are connected to each other in parallel.
And, by sequentially connecting these constituent elements in an annular shape, a vapor compression refrigeration cycle that is a refrigeration system or a refrigeration system is configured.

Similarly, the second cooling system B is also the compressor 2
Outdoor unit U having 1a and outdoor heat exchanger 22a
21b, pressure reducing device 25b1 and heat storage heat exchanger 26b
1, a pressure reducing device 25b2 and a heat storage heat exchanger 26b2 are connected in parallel with each other, an indoor unit U22b having a pressure reducing device 23b and a use side heat exchanger 24b,
And a vapor compression refrigeration cycle that is a refrigeration system or a refrigeration system is configured by sequentially connecting these components in an annular shape.

In FIG. 6, the heat storage tank 92 includes the heat storage heat exchanger 16a of the first cooling system, the heat storage heat exchanger 26a1 of the second cooling system A, and the heat storage heat exchange of the second cooling system B. The heat storage tank 93 is provided with the heat storage heat exchanger 16b of the first cooling system and the second cooling system A.
The heat storage heat exchanger 26a2 and the heat storage heat exchanger 26b2 of the second cooling system B are installed.

That is, as shown in FIG. 6, the heat storage type refrigerating and air conditioning apparatus according to the fourth embodiment has the configurations 30a and 30b.
And, on the one hand, are connected to one first cooling system, and on the other hand,
It is separately connected to each of the second cooling system A and the second cooling system B.

In the second cooling system A, a set consisting of the pressure reducing device 25a1 and the heat storage heat exchanger 26a1
The depressurizing device 25a2 and the heat storage heat exchanger 26a2 may not be connected in parallel with each other, but may be connected in series as described in the second embodiment. Similarly, in the second cooling system B as well, the set including the pressure reducing device 25b1 and the heat storage heat exchanger 26b1 and the pressure reducing device 25
It is also possible to connect the set made up of b2 and the heat storage heat exchanger 26b2 in series without connecting them in parallel with each other.

Further, as for the first cooling system, the on-off valves V11a and V1 are also described as described in the second embodiment.
2a and V13a, a pressure reducing device 15a and a heat storage heat exchanger 16a, and on-off valves V11b, V12b and V13b, a pressure reducing device 15b and a heat storage heat exchanger 16b.
It is also possible to connect the group consisting of and in series.

Therefore, the heat storage type refrigerating and air-conditioning apparatus shown in FIG. 6 performs the cold storage operation of storing cold heat in the heat storage tanks 92 and 93 by the first cooling system, and the second cooling system A and the second cooling system B, respectively. Thus, both the cold storage utilization cooling operation using the cold heat stored in the heat storage tanks 92 and 93 can be executed in parallel and simultaneously.

As described above, according to the heat storage type refrigerating air conditioner of the fourth embodiment, the heat storage heat exchanger 26 provided in the second cooling system A in the configuration shown in the third embodiment is used. a and the decompression device 2 5 a are connected in parallel or in series to each other in two groups (a set consisting of the heat storage heat exchanger 2 6 a1 and the decompression device 2 5 a1 and a heat storage heat exchanger 2 6
a2 and a decompression device 2 5 a2), and the heat storage heat exchanger 2 6 provided in the second cooling system B.
b and the decompression device 2 5 b are connected in parallel or in series to each other in two groups (a set consisting of the heat storage heat exchanger 2 6 b1 and the decompression device 2 5 b1, and a heat storage heat exchanger 2 6 b2 and the decompression device 2). 5 b2) and the first
Storage tank 92 in which the heat storage heat exchanger 16a of the cooling system is installed
In the heat storage tank 93 in which the heat storage heat exchangers 2 6 a1 and 2 6 b1 described above are installed, and the heat storage heat exchanger 16b of the first cooling system is installed in the heat storage heat exchangers 2 6 a2 and 2 6
Since b2 is installed, even if the cooling load between the second cooling system A and the second cooling system B that uses heat storage is different, the effect of the third embodiment is achieved by the inexpensive device configuration. Can fully enjoy.

Further, in the above description of the fourth embodiment, the number of the second cooling systems constituting the heat storage type refrigerating air-conditioning apparatus is two, but the same applies to three or more second cooling systems. The idea of can be applied.

Embodiment 5. Next, a heat storage type refrigerating air conditioner according to the fifth embodiment will be described. In the heat storage type refrigeration air conditioners according to the first to fourth embodiments, since only one first cooling system that performs heat storage operation is provided, if an air conditioning load occurs in this air conditioning system, no matter how small the load is. Even if there is, it is necessary to stop heat storage and switch to normal cooling operation or heating operation. In this case, there is a possibility that the amount of heat storage required in the second cooling system may not be secured in the heat storage tank, or that the cooling capacity may be insufficient during nighttime operation of the second cooling system.

Therefore, in order to solve this problem, the heat storage type refrigerating air conditioner according to the fifth embodiment is provided with a plurality of first cooling systems, and one second cooling system is provided for each first cooling system. It is characterized by having a heat storage tank shared with the system.

FIG. 7 is a block diagram showing a schematic configuration of a heat storage type refrigerating air conditioner according to the fifth embodiment. In FIG. 7, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In regenerative refrigeration air conditioning system shown in FIG. 7, thermal storage type refrigerating air conditioning system is different from that shown in FIG. 1, the heat storage tank 90a to the installed heat storage heat exchanger 16a
And the heat storage heat exchanger 16b installed in the heat storage tank 90b are provided in separate first cooling systems.

In FIG. 7, one of the two first cooling systems (hereinafter referred to as the first cooling system A) includes a compressor 11a, a four-way passage switching valve 19a and an outdoor heat exchanger 12a. An outdoor unit U11a having a pressure reducing device 15a, a heat storage heat exchanger 16a, an indoor unit U12a having a pressure reducing device 13a and a use side heat exchanger 14a
And, the vapor compression refrigeration cycle that is an air conditioning system is configured by sequentially connecting these components in an annular shape.

Similarly, for the other cooling system of the two first cooling systems (hereinafter referred to as the first cooling system B), the compressor 11b, the four-way passage switching valve 19b and the outdoor heat exchanger are similarly provided. The outdoor unit U11b having 12b, the pressure reducing device 15b, the heat storage heat exchanger 16b, and the pressure reducing device 13
b and the indoor unit U having the use side heat exchanger 14b
12b, and a vapor compression refrigeration cycle, which is an air conditioning system, is configured by sequentially connecting these components annularly.

That is, as shown in FIG. 7, the heat storage type refrigerating and air-conditioning apparatus according to the fifth embodiment has configurations 40a and 40b.
And on the one hand are connected to one second cooling system, and on the other hand
It is separately connected to each of the first cooling system A and the first cooling system B.

In FIG. 7, the configuration corresponding to the second cooling system has the same operation as that of the first embodiment, and
Also in the first cooling system A and the first cooling system B, the first cooling system in the first embodiment, respectively, is a set including the pressure reducing device 15a and the heat storage heat exchanger 16a, and the pressure reducing device 15b and the heat storage heat exchanger. This is the same as the mode in which only one of the group consisting of 16b is connected, and the operation is also the same, so the description of the operation of the heat storage type refrigerating and air-conditioning apparatus according to the fifth embodiment will be omitted. Further, as described in the first embodiment, the third cooling system and the fourth cooling system described above can be introduced in consideration of the operation of the heat storage type refrigerating and air-conditioning apparatus.

As described above, according to the heat storage type refrigerating air conditioner according to the fifth embodiment, the heat storage heat exchanger 1 provided in one first cooling system in the configuration shown in the first embodiment. 6 a and a pressure reducing device 1 5 a and a heat storage heat exchanger 1 6 b and a pressure reducing device 1 5 b are divided into a first cooling system A and a first cooling system B, respectively. Since it is installed, the effect of the first embodiment can be enjoyed, and in one second cooling system, the cold heat accumulated by all of the plurality of first cooling systems forming the heat storage type refrigerating and air-conditioning apparatus is used. can do.

In particular, even if an air conditioning load is generated in either the first cooling system A or the first cooling system B at night, heat storage is individually stopped only in the cooling system in which the air conditioning load is generated. Then, the air-conditioning operation can be switched to, and the heat storage in the heat storage tank can be secured by the other cooling system.

Sixth Embodiment Next, a heat storage type refrigerating air conditioner according to the sixth embodiment will be described. In the heat storage type refrigeration air conditioners according to the first to fifth embodiments, the introduction of the third cooling system makes it possible to process the base load of the air conditioning, but the first cooling system performs the cold storage operation. If so, the indoor unit U12 is separated from the refrigeration cycle and is in a stopped state.

Therefore, the air temperature around the indoor unit U12 is different from that around the indoor unit U32 of the other third cooling system, and the normal cooling operation or heating by the first cooling system is performed again. When starting the operation, quick cooling or heating around the indoor unit U12 is hindered,
Occasionally, it may be difficult to maintain indoor comfort.

Therefore, in order to avoid such a situation, in the heat storage type refrigerating air conditioner according to the sixth embodiment, the use side heat exchanger 14 of the first cooling system and the above-mentioned third cooling system are used. A shared heat exchanger capable of cooling a cooling target by at least one of the side heat exchangers 34 is provided.

FIG. 8 is a block diagram showing a schematic structure of a heat storage type refrigerating and air conditioning apparatus according to the sixth embodiment. Note that, in FIG. 8, portions common to those in FIGS. 1 and 2A are denoted by the same reference numerals, and description thereof will be omitted. In the heat storage type refrigeration air conditioning system shown in FIG. 8, a use side heat exchanger 17 is shown instead of the use side heat exchanger 14 of the first cooling system, and a use side heat exchange of the third cooling system is also shown. Although the use side heat exchanger 37 is shown instead of the vessel 34, there is no change in the function of each. However, these use side heat exchangers 17 and 37
Are housed in the plate fin type heat exchanger 50 which is the above-mentioned shared type heat exchanger, and the pressure reducing devices 13 and 33 are
Together with this, an indoor unit U51 is configured.

The plate fin type heat exchanger 50 is an ordinary refrigerant-air heat exchanger, and is configured so that the utilization side heat exchangers 17 and 37 share the fins of each other.

As described above, according to the heat storage type refrigerating air conditioner according to the sixth embodiment, the use side heat exchanger 17 of the first cooling system and the use side heat exchanger 37 of the third cooling system are provided. Since the indoor unit U51 shares the cooling capacity or the heating capacity with the shared heat exchanger, the refrigerant is not supplied to the usage-side heat exchanger 17 during the nighttime when the air conditioning load is small. However, the cooling or heating capacity of the use-side heat exchanger 37 of the third cooling system can constantly air-condition the periphery of the indoor unit U51, so that indoor comfort can be maintained.

When either one of the use side heat exchangers 17 and 37 is used, since the fins of the other use side heat exchangers that are not used are shared, the air side heat transfer area increases and the refrigeration It also has the effect of improving the efficiency of the cycle.

Further, by introducing the above-mentioned fourth cooling system,
When both the fourth cooling system and the second cooling system are processing the same cooling load, the plate-fin type heat exchangers sharing the fins in the use side heat exchangers 44 and 24 are similarly used. It may be equipped with a container.

In the first to sixth embodiments described above, only one set of the pressure reducing device and the use side heat exchanger in each indoor unit in the first to fourth cooling systems is provided in the same refrigeration cycle. Although an example in which they are connected is shown, it is also possible to connect a plurality of sets in parallel in each refrigeration cycle.

[0135]

As described above, according to the present invention , a refrigerated showcase or the like like a convenience store is provided.
Even if the cooling load of the heat exchanger on the use side of the
Utilize excess capacity of air conditioners even if they are almost equal
By reducing the heat source equipment required capacity,
It adapts to the temperature of the heat storage material without sacrificing
Obtaining a heat storage type refrigeration air conditioner that enables constant heat storage
You can

According to the next invention, the capacity of the second cooling system
Is smaller than the capacity corresponding to the original processing capacity
Capacity is enough.

According to the next invention, since the first cooling system is provided with at least two first heat storage heat exchangers, each of these heat storage heat exchangers stores the heat storage shared by the second cooling system. A tank can be provided, and the cold heat accumulated by the first cooling system can be dispersed in a plurality of heat storage tanks.

According to the next invention, since the second cooling system is provided with at least two second heat storage heat exchangers, each of these heat storage heat exchangers stores the heat storage shared with the first cooling system. It is possible to provide a tank, and it is possible to utilize the heat storage of the plurality of heat storage tanks in the second cooling system.

According to the next invention, the first cooling system and the second cooling system
Since at least two heat storage tanks that can be shared with the cooling system are provided, it is possible to disperse the cold heat accumulated by the first cooling system into the plurality of heat storage tanks. by the specification, there is an effect that it is possible these thermal storage tank to facilitate the reuse of when it is discarded.

According to the next invention, since at least two second cooling systems are provided for one first cooling system, the cold heat stored by one first cooling system is divided into a plurality of first cooling systems. 2 cooling system,
The cold heat accumulated by the first cooling system can be used in all of the plurality of second cooling systems that constitute the heat storage type refrigeration air conditioning system, and the capacity of the heat source device used in each second cooling system It is possible to reduce the size and cost of the device and reduce the amount of electric power required to operate the heat source device.

According to the next invention, since at least two first cooling systems are provided for one second cooling system, the cold heat accumulated by the plurality of first cooling systems is secondarily cooled.
The effect of being able to secure heat storage in the heat storage tank by the other first cooling system even when a situation occurs in which any of the plurality of first cooling systems is stopped Play.

According to the next invention, with respect to the first cooling system which is provided with a plurality of first utilization side constitutions including the first pressure reducer and the first utilization side heat exchanger, and which are connected in parallel with each other. Even in this case, it is possible to obtain the effects of the above-described inventions.

According to the next invention, with respect to the second cooling system which is provided with a plurality of second user side constitutions including the second pressure reducer and the second user side heat exchanger and which are connected in parallel with each other. Even in this case, it is possible to obtain the effects of the above-described inventions.

According to the next invention, the first user side heat exchange
And the third user side heat exchanger share the fins
Use only one of the user side heat exchangers.
The heat transfer area on the air side increases,
Efficiency is improved.

According to the next invention, since the first and third cooling systems are provided with the four-way valve that enables switching between cooling and heating, the utilization side heat exchangers of the first and third cooling systems are used. Ru can perform cooling operation and heating operation.
According to the next invention, it is cooled like a convenience store.
The cooling load of the heat exchangers on the use side such as warehouse showcases is at night
Even if it is almost the same as daytime,
The required capacity of the heat source machine by utilizing the surplus capacity of
Along with the reduction in the amount of heat storage material,
Thermal storage type freezing air that adapts to temperature and enables stable thermal storage
A control device can be obtained. According to the next invention, refrigeration
Alternatively, the cooling capacity of the refrigeration system can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a heat storage type refrigeration air conditioner according to a first embodiment.

FIG. 2 is an explanatory diagram for explaining a configuration of a third cooling system and a fourth cooling system in the heat storage type refrigerating air conditioner according to the first embodiment.

FIG. 3 illustrates the relationship between the cooling loads of the first and third cooling systems and the time and the relationship between the cooling load of the second cooling system and the time in the heat storage type refrigerating and air-conditioning apparatus according to the first embodiment. FIG.

FIG. 4 is a block diagram showing a schematic configuration of a heat storage type refrigeration air conditioner according to a second embodiment.

FIG. 5 is a block diagram showing a schematic configuration of a heat storage type refrigeration air conditioner according to a third embodiment.

FIG. 6 is a block diagram showing a schematic configuration of a heat storage type refrigeration air conditioner according to a fourth embodiment.

FIG. 7 is a block diagram showing a schematic configuration of a heat storage type refrigeration air conditioner according to a fifth embodiment.

FIG. 8 is a block diagram showing a schematic configuration of a heat storage type refrigeration air conditioner according to a sixth embodiment.

FIG. 9 is a block diagram showing a schematic configuration of a conventional heat storage type refrigeration air conditioner.

[Explanation of symbols]

11a, 11b, 21a, 21b, 31a, 31b, 4
1a, 41b compressor, 12, 12a, 12b, 22,
22a, 22b, 32, 42 outdoor heat exchanger, 13, 1
3a, 13b, 15a, 15b, 23, 23a, 23
b, 25a, 25b, 33, 43 decompression device, 14, 1
4a, 14b, 24, 24a, 24b, 34 Use side heat exchanger, 16, 16a, 16b, 26, 26a, 26b
Heat storage heat exchanger, 19, 19a, 19b, 39 Four-way flow path switching valve, 50 Plate fin type heat exchanger, U1
1, U21, U31, U41 outdoor unit, U12,
U22, U32, U42, U51 Indoor unit, 90
a, 90b, 92, 93 heat storage tank, V11a, V11
b, V12a, V12b, V13a, V13b Open / close valve.

Continuation of the front page (56) References JP-A 64-10062 (JP, A) JP-A 5-133661 (JP, A) JP-A 6-241591 (JP, A) Actual Kaihei 2-106570 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 5/00

Claims (13)

(57) [Claims] 1. A first compressor, a first heat source side heat exchanger,
A first cooling system having a first pressure reducer, a first utilization side heat exchanger and a first heat storage heat exchanger to form a first refrigeration cycle; a second compressor; and a second compressor. Heat source side heat exchanger, second pressure reducer,
A second refrigerating cycle is constituted by having a second utilization side heat exchanger and a second heat storage heat exchanger, and is different from the first cooling system.
The second cooling system for cooling the cooling target , the third compressor, the third heat source side heat exchanger, the third pressure reducer,
And a third refrigeration cycle having a third utilization side heat exchanger
For cooling the same cooling target as the first cooling system.
3 of a cooling system, a heat storage tank that is shared by the first thermal storage heat exchanger and the second heat storage heat exchanger the first and second cooling system comprises a with store cold, pre Symbol first 1 of the cooling system is thermal storage into the thermal storage tank via the first thermal storage heat exchanger by disconnecting the first utilization-side heat exchanger from the first cooling system of the refrigeration cycle cold storage
When the second cooling system is operated , cold storage is used.
Cooling operation, the third cooling system performs a normal operation in a low load operation mode, and the first heat storage heat exchanger is switched to the first cooling mode.
The first and the third are separated from the refrigeration cycle of the cooling system.
The cooling system is for normal operation, and the second cooling system is for cooling using cooling storage.
A heat storage type refrigerating and air-conditioning apparatus comprising: a high-load operation mode in which a rolling operation is performed, and an operation mode switching means for switching between the operation modes. 2. The capacity of the third cooling system is the same as the capacity of the first cooling system.
And selected as the base part of the cooling target load of the third cooling system
The capacity of the first cooling system to the first and third
The third cooling from the peak load of the cooling target load of the cooling system
Characterized by selecting the capacity after subtracting the capacity of the system
The heat storage type refrigerating and air-conditioning apparatus according to claim 1. 3. The first cooling system is provided with at least two first heat storage heat exchangers, and the first heat storage heat exchangers are connected in series or in parallel with each other. The heat storage type refrigerating air conditioner according to 1 or 2. 4. The second cooling system includes at least two second heat storage heat exchangers, and the second heat storage heat exchangers are connected in series or in parallel with each other. The heat storage type refrigerating and air-conditioning apparatus according to 1, 2 or 3. 5. At least two heat storage tanks are provided, and each of the heat storage tanks is provided with at least one first heat storage heat exchanger and at least one second heat storage heat exchanger. The heat storage type refrigerating and air conditioning apparatus according to claim 3 or 4. 6. The heat storage type refrigerating and air conditioning apparatus according to claim 1, further comprising at least two second cooling systems. 7. The heat storage type refrigerating air-conditioning apparatus according to claim 1, further comprising at least two first cooling systems. 8. The first cooling system includes at least two first use side configurations including the first pressure reducer and the first use side heat exchanger, and the first use side configuration. The heat storage type refrigerating and air-conditioning apparatus according to any one of claims 1 to 7, wherein: 9. The second cooling system includes at least two second user side configurations including the second pressure reducer and the second user side heat exchanger, and the second user side configuration. The heat storage type refrigerating and air-conditioning apparatus according to any one of claims 1 to 8, wherein: 10. The first utilization side heat exchanger and the third
The heat storage type refrigerating and air-conditioning apparatus according to any one of claims 1 to 7 , wherein a fin is shared with the utilization side heat exchanger . 11. The first and third cooling systems are provided with a four-way valve for switching a cooling operation by the first and third utilization side heat exchangers to a cooling operation or a heating operation. The heat storage type refrigerating air-conditioning apparatus according to any one of claims 1 to 10. 12. The method according to claim 12, First compressor, first heat source side heat exchange
The reactor, the first decompressor and the first utilization side heat exchanger
First heat storage heat exchanger that is connected in a circular shape and stores cold heat in a heat storage tank
Is connected in parallel / series to the first heat exchanger on the use side.
Replaceable to configure the first refrigeration cycle and
Is a heat storage cooling operation, an air conditioning system that is air-conditioned during the day, The second compressor, the second heat source side heat exchanger, and the cooling of the heat storage tank.
Second storage using heat Heat heat exchanger, second pressure reducer and
Second freezing by sequentially connecting the second use side heat exchangers in an annular shape
A cycle is configured and cooling operation using heat storage is performed both day and night.
Refrigerated or frozen system, The third compressor, the third heat source side heat exchanger, the third pressure reducer and the
And the third user side heat exchanger are sequentially connected in an annular shape to form a third
The third that constitutes the refrigeration cycle and is air-conditioned both day and night
Cooling system, A heat storage type refrigerating and air-conditioning apparatus characterized by comprising: 13. 4th compressor, 4th heat source side heat exchange
The reactor, the fourth decompressor, and the fourth user-side heat exchanger in sequence.
To form a fourth refrigeration cycle,
Or equipped with a fourth cooling system in cooperation with the refrigeration system
The heat storage type refrigerating and air-conditioning apparatus according to claim 12.