JP3197107B2 - Thermal storage type air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a daytime electric power suppressing and leveling countermeasure, and more particularly to a heat storage type air conditioner having a heat storage tank containing a cold storage heat medium.

[0002]

2. Description of the Related Art FIG. 25 shows a conventional embodiment. ing. Reference numeral 4 denotes an outdoor heat exchanger that functions as a condenser during cooling and as an evaporator during heating, and is connected to the first four-way switching valve 2 via a refrigerant circuit 5.

[0003] Reference numeral 6 denotes a first expansion device, which is connected to the outdoor heat exchanger 4 by a refrigerant circuit 7, and 8 denotes a first valve.
Of the refrigerant circuit 9 from the expansion device 6
And 11 are connected to the first valve 8 and the fifth valve 12, respectively, and the refrigerant circuit 13 is connected to the fifth valve 12
And the heat exchanger 14 for heat storage.

Reference numeral 15 denotes a heat storage tank, in which a number of heat transfer tubes are vertically arranged, and a heat storage medium 16, for example, water stored in the tank is stored by the heat storage heat exchanger 14 formed by connecting the heat transfer tubes. Freezing during cooling and heating during heating.

[0005] The refrigerant circuit 17 from the heat storage heat exchanger 14 is branched to form a refrigerant circuit 18 and a refrigerant circuit 19. The refrigerant circuit 19 is connected to a second four-way switching valve 20. It is connected to the third valve 21. Reference numeral 22 denotes a second compressor that conveys the refrigerant, and selects a compressor having a variable operating capacity. The refrigerant circuit 23 is connected to the discharge port of the second compressor 22 .
Out and which connects the second four-way switching valve 20, the refrigerant circuit 24 and the second four-way switching valve 20 and the second compressor 2
Two suctions are connected. 25 is a fourth valve,
The refrigerant circuit 26 is connected to the second four-way switching valve 20.

Reference numeral 27 denotes a refrigerant circuit connected to the above-mentioned first valve 8, and a plurality of indoor unit refrigerant circuit systems a, b, and c are provided between the circuit and the refrigerant circuit 28. , Refrigerant circuit 29, second expansion device 30, refrigerant circuit 3
1. The indoor heat exchanger 32 and the refrigerant circuit 33 are sequentially connected.

The refrigerant circuit 34 from the fourth valve 25 is branched to form a refrigerant circuit 35 and the refrigerant circuit 28. The refrigerant circuit 35 is connected to the second valve 36 and connected to the second valve 36. After the joined refrigerant circuit 37 and the refrigerant circuit 38 connected to the third valve 21 are joined, they are connected to the first four-way switching valve 2 by the refrigerant circuit 39.

In the cold storage operation in which the regenerative air conditioner having the above-described configuration operates at night, the first valve 8, the second valve 36, and the fourth valve 25 are closed as shown in FIG. The third valve 21 and the fifth valve 12 are opened, and the first compressor 1 is operated. At this time, the refrigerant discharged from the first compressor 1 is condensed in the outdoor heat exchanger 4, adiabatically expanded in the first expansion device 6, evaporates in the heat storage heat exchanger 14, and e.g. Heat is taken from water, the surface of the heat storage heat exchanger 14 is frozen, and the vaporized refrigerant returns to the first compressor 1. With this operation, the heat storage medium 16
Storing low-temperature heat by freezing.

FIG. 27 shows an operation state during the cold storage operation. The operating points represented by numerals in the figure indicate the state of the refrigerant at locations corresponding to the reference numerals of the refrigerant circuit shown in FIG. In this operation, the system starts ice making at 22:00 and ends ice making at 8:00 the next morning, for example, on the assumption that there is no residual ice in the tank.

The cooling operation in the daytime will be described below. FIG.
Reference numeral 8 denotes a cooling operation when the cooling operation is performed only by the first compressor 1 without using the cold storage heat. In the figure, the first valve 8 and the second valve 36 are opened, the first throttle device 6 is fully opened, the third valve 21, the fourth valve 25, and the fifth valve 12 are closed, and the first compressor is opened. Drive 1 The high-pressure refrigerant condensed and liquefied by the same operation as in FIG.
, And sent to the indoor unit refrigerant circuit systems a, b, and c. The pressure is reduced while adjusting the amount of the refrigerant in each second expansion device 30, and the indoor heat is generated at a pressure of about 6 kg / cm ² G. It flows into the exchanger 32 and evaporates. At this time, the refrigerant that has absorbed heat from the surrounding room air and returned to the first compressor 1 is gasified.

FIG. 29 shows an operation state during the general cooling operation. The numbers in the figure are as described in FIG. 26. The condensation temperature is about 45 ° C. and the evaporation temperature is about 10 ° C. In this operation, the present system performs, for example, cooling after consuming cold storage heat.

FIG. 30 shows cooling by cold storage heat, that is, a cooling operation. In the figure, the first throttle device 6, the second valve 36, and the third valve 21 are closed, and the first valve 8, the fourth valve
The second compressor 22 is operated by opening the valve 25 and the fifth valve 12. At this time, the gas refrigerant sent out by the second compressor 22 is pressurized to about 9 kg / cm ² G, then cooled by ice in the heat storage tank 15 and condensed at about 22 ° C. After the pressure is reduced to about 6 kg / cm ² G by the above, the refrigerant is sent to each indoor unit refrigerant circuit system a, b, c, and cooled in the same manner as in FIG. At this time, the refrigerant circulation amount of the second compressor 22 is equal to the refrigerant circulation amount of the first compressor 1 in FIG.
The same amount of refrigerant having the same temperature and the same pressure as in the ordinary cooling flows, and the cooling capacity is the same as that of the first compressor 1 irrespective of the small capacity of about 3 kg / cm ² as the power. This is equivalent to the general cooling operation in FIG.

FIG. 31 shows an operation state during the cooling operation. The numbers in the figure are as described in FIG. 26. The condensation temperature is about 22 ° C. and the evaporation temperature is about 10 ° C. In this operation, the system performs, for example, cooling at a light load.

FIG. 32 shows the general cooling operation of FIG. 28 and FIG.
A cooling operation combined with regenerative heat in which a cooling operation of 0 is simultaneously performed is shown. In the figure, the third valve 21 is closed, and the first valve 8, the second valve 36, the fourth valve 25, the fifth
, The first compressor 1 and the second compressor 22 are operated. At this time, the liquid refrigerant condensed in the heat storage tank 15 on the second compressor 22 side joins with the refrigerant decompressed by the first expansion device 6 on the first compressor 1 side, and the refrigerant circuit system for the indoor unit a , B, and c, the refrigerant circulates about twice as much as in the general cooling operation in FIG. 28 or the cooling operation in FIG. 30, and the capacity is also doubled.

FIG. 33 shows an operation state during the cooling operation using the cold storage heat. The numbers in the figure are as described in FIG. Evaporation temperature is about 10 ° C like other cooling operation,
The condensation temperature of the outdoor heat exchanger 4 is about 45 ° C., and that of the heat storage heat exchanger 14 is about 22 ° C. In this operation, the system performs cooling under normal cooling load.

In the cooling operation combined with cold storage and heat, when the cooling load is smaller than the normal operation, the operation frequency of the first compressor is controlled using, for example, an inverter, and the cooling load is changed from the cooling load only by the cooling operation. Up to twice the cooling load.

Although the operation relating to cooling has been described above, the operation relating to heating will be described below. Therefore, unless otherwise specified, the first four-way switching valve 2 and the second four-way switching valve 2 are used.
0 is set to the heating mode. FIG. 34 shows, for example, a heat storage operation at night, that is, a hot water storage operation. In FIG. 34, the first valve 8, the second valve 36 and the fourth valve 25 are closed, the third valve 21 and the fifth valve 12 are opened, and the first compressor 1 is operated. At this time, the high-temperature gas refrigerant discharged from the first compressor 1 flows in the direction of the arrow in the drawing, condenses in the heat storage heat exchanger 14 of the heat storage tank 15, and the heat storage medium 16
Is heated. The condensed refrigerant adiabatically expands in the first expansion device 6, absorbs heat from the outside air in the outdoor heat exchanger 4 and evaporates.
Return to the compressor 1.

FIG. 35 shows an operation state during the heat storage operation. The numbers in the figure are as described in FIG. 26. The boiling temperature of the tank water temperature is about 50 ° C., and the condensation temperature at this time is about 55 ° C.
° C, the evaporation temperature is about 0 ° C. In this operation, the system stores hot water during the nighttime power period and ends the operation as soon as the temperature reaches a predetermined tank water temperature.

The daytime heating operation will be described below. FIG.
Reference numeral 6 denotes a general heating operation when the heating operation is performed only by the first compressor 1 without using the heat storage. In the figure, the first valve 8 and the second valve 36 are opened, the first throttle device 6 is opened, the third valve 21, the fourth valve 25, and the fifth valve 12 are closed, and the first The compressor 1 is operated. The high-temperature and high-pressure gas discharged from the first compressor 1 at a pressure of about 17 kg / cm ² G is supplied to the refrigerant circuit systems a, b,
c, and is condensed in each indoor heat exchanger 32 to heat the indoor air. The condensed liquid refrigerant is supplied to the second expansion device 30
After the pressure is reduced to a pressure of about 4 kg / cm ² G in the outdoor heat exchanger 4, the first pressure is reduced by the same operation as in FIG.
Return to the compressor 1.

FIG. 37 shows an operation state during the general heating operation. The numbers in the figure are as described in FIG. 26. The condensation temperature is about 42 ° C. and the evaporation temperature is about 0 ° C. In this operation, the present system performs heating during light load during the day after heat storage consumption, for example.

FIG. 38 shows heating by heat storage, that is, heat dissipation operation. In the figure, the first throttle device 6, the second valve 36, and the third valve 21 are closed, and the first valve 8, the fourth valve
The second compressor 22 is operated by opening the valve 25 and the fifth valve 12. At this time, the gas refrigerant delivered from the second compressor 22 is supplied to each indoor unit refrigerant circuit system a, b,
condensed in order sent 17 kg / cm ² G to c, is again sucked into the heat storage is heated and vaporized at the evaporation pressure of about 13 kg / cm ² G in a heat exchanger the second compressor 22. FIG. 39 shows an operation state during the heat dissipation operation. The numbers in the figure are as described in FIG. 26. The condensation temperature is about 42 ° C. and the evaporation temperature is about 35 ° C. In this operation, the present system performs, for example, heating at a light load.

FIG. 40 shows the general heating operation of FIG. 36 and FIG.
8 shows a heat storage combined heating operation in which the heat dissipation operation of FIG. In the figure, the third valve 21 is closed, the first valve 8, the second valve 36, the fourth valve 25, and the fifth valve 12 are opened, and the first compressor 1 and the second compressor 22 are connected. drive. At this time, the gas refrigerant discharged from the second compressor 22 merges with the gas refrigerant discharged from the first compressor 1,
A high-temperature and high-pressure refrigerant having a pressure of about 17 kg / cm ² G is circulated to the indoor unit refrigerant circuit systems a, b, and c in an amount about twice that in the general heating operation in FIG. 36 or the heat radiation operation in FIG. As a result, the ability will be about double. About 1/2 kg of the refrigerant of about 13 kg / cm ² G decompressed by the second expansion device 30 flows into the heat storage tank 15 and performs the same operation as the heat dissipation operation in FIG. The pressure is further reduced by the first expansion device 6 and reaches a pressure of about 4 kg / cm ² G, flows into the outdoor heat exchanger 4, and performs the same operation as the general heating operation in FIG.

FIG. 4 shows the operating state during the heat storage combined heating operation.
It is shown in FIG. The numbers in the figure are as described in FIG. The condensation temperature is about 42 ° C. as in other heating operations, but the evaporation temperature is about 35 ° C. for the heat storage heat exchanger 11 and about 0 ° C. for the outdoor heat exchanger 4 . In this operation, the system performs heating when the heating load is concentrated, for example, in the morning.

FIG. 42 shows a standard operation pattern diagram during cooling. In the drawing, for example, in the operation time zone of each operation pattern, the cold storage operation is 22:00 to 8:00, and the cooling operation is 8:00 to 22:00. The cold storage operation is an operation by the first compressor with a cold storage capacity of 8000 kcal / h, and 8000 kcal / h × 10h = 8 in a cold storage time zone.
A cold storage amount of 0000 kcal can be secured. On the other hand, in the daytime cooling operation, the cooling operation combined with the cold storage heat is performed during the time period when the cooling load of the day is large (load concentration time period). 5 hp operation for cooling operation 1
It is desired to perform 0h, but since the regenerative heat is 80000 kcal, the cooling operation side is stopped at about 14:30. In this system, the base load of cooling cannot be covered by the cooling operation throughout the load concentration time zone. The general cooling portion covers a region where the cooling load fluctuates, and exhibits a cooling capacity of 5 horsepower when the cooling load is maximized. After consuming cold storage heat, the general compressor uses the first compressor for cooling.
The cooling operation with horsepower is performed, but when the cooling load is 5 hp or more, the cooling capacity becomes insufficient.

[0025]

The conventional regenerative air conditioner that performs each of the above-described operations has a problem in that the amount of cold storage heat stored by the cold storage operation at night is reduced. That is, since the capacity of the first compressor is determined by the daytime cooling / heating operation, the cooling / radiation operation exhibiting the same performance as the general cooling / heating operation is performed in the power load concentrated time zone (when the power consumption of the air conditioner is large). Obi, 8: 00-
18:00), it was not possible to secure a sufficient amount of cold storage heat for operation.

In addition, if the air conditioning load exceeds the cooling and heating capacity of general cooling and heating after the cold storage heat consumption, there is a problem that the operation is insufficient.

Further, during the cooling / heating operation by the first compressor, the cold storage or the heat storage operation could not be performed.

The present invention focuses on the above-mentioned points, and an object of the present invention is to provide a heat storage device capable of securing a sufficient amount of cold storage heat for operation throughout most of the time zone. It is to provide a type air conditioner.

[0029]

In order to achieve the above object, a heat storage and cooling device according to the present invention has a first compressor, a first four-way switching valve, a first outdoor heat exchanger, a first outdoor heat exchanger, and a first outdoor heat exchanger. Diaphragm device,
A first general cooling / heating circuit formed by sequentially connecting a second expansion device and an indoor-side heat exchanger; a second compressor;
Four-way switching valve, second outdoor heat exchanger, second throttle device
, And a second formed by sequentially connecting the indoor heat exchanger
2 general cooling and heating circuits , the first compressor, the first
Four-way switching valve, the first outdoor heat exchanger, said first throttle device, and a heat storage heat exchanger and are sequentially connected form <br/> first cold accumulating heat circuit, said first The second compressor, the second
A four-way switching valve, the second outdoor heat exchanger, a third throttle device
And a second heat storage heat exchanger formed by sequentially connecting the heat storage heat exchangers.
2 for the cold storage heat , the second compressor, and the heat storage heat
Heat exchanger, the second expansion device, and the indoor heat exchanger in this order.
Comprising a heat absorption circuit formed by the following connection, and a heat storage tank that houses the thermal storage heat exchanger, depending on the load conditions, the
A first general cooling and heating circuit, a second general cooling and heating circuit,
The first circuit for cold storage heat, the second circuit for cold storage heat and the cooling heat circuit
Allow refrigerant to flow through selected circuits of the
Cooling / heating, cold storage, cold storage, cooling / heating and cold storage, cooling / heating
Operation in any of the modes
The operation is controlled by switching the modes according to changes in the load.
Caught. Further, in a time zone when the power demand is small, such as at night, the second compressor, the second four-way switching valve, the second outdoor heat exchanger, the third throttle device, and the heat storage A means for performing a cold storage operation or a heat storage operation by using a second cold storage heat circuit formed by sequentially connecting heat exchangers and the first cold storage heat circuit is taken.

In the cooling / heating operation, the second
A second general cooling and heating circuit formed by sequentially connecting the compressor, the second four-way switching valve, the second outdoor heat exchanger, the second expansion device, and the indoor heat exchanger And the first general cooling and heating circuit may be used in combination for cooling and heating.

In addition, during the operation with combined use of cold storage and heat, cooling or heating is performed by the first general cooling and heating circuit, and at the same time, the second compressor, the second four-way switching valve,
Cold storage or heat storage may be performed by a second cold storage heat circuit formed by sequentially connecting the second outdoor heat exchanger, the third expansion device, and the heat storage heat exchanger.

[0032]

According to the above configuration, when cold storage heat is stored by cold storage operation or heat storage operation during a time period during which power demand is small, such as at night, the first compressor and the second compressor are operated simultaneously. That is, the amount of cold storage heat increases by using the first and second circuits for cold storage heat together. Therefore, the cooling / radiating operation that exhibits the same performance as the general cooling and heating by the first compressor in the daytime is performed through the power load concentrated time period (time period when the power consumption of the air conditioner is large, 8:00 to 18:00). Can drive.

Further, even if the air conditioning load exceeds the cooling and heating capacity of the general cooling and heating by the first compressor after the cold storage heat consumption during the cooling and heating operation, the capacity is supplemented by operating the second compressor.

Further, during the general cooling and heating operation by the first compressor, the second compressor can perform the cold storage or heat storage operation.

[0035]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a basic system of the present invention. In the figure, reference numeral 1 denotes a first compressor having a variable operating capacity and a rated 5 hp, and 2 denotes a first four-way switching valve.
It is connected by. Reference numeral 4 denotes a first outdoor heat exchanger that functions as a condenser during cooling and as an evaporator during heating, and is connected to the first four-way switching valve 2 via a refrigerant circuit 5.

Reference numeral 6 denotes a first expansion device, which is connected to the first outdoor heat exchanger 4 by a refrigerant circuit 7, and 8 denotes a first valve, which controls the refrigerant circuit 9 from the first expansion device 6. The refrigerant circuit 10 and the refrigerant circuit 11 are branched to be connected to the first valve 8 and the fifth valve 12, respectively.
The refrigerant circuit 41 is branched to form a refrigerant circuit 42 and a refrigerant circuit 13. The refrigerant circuit 13 is connected to the heat storage heat exchanger 14, and the refrigerant circuit 42 is connected to the third expansion device 43. ing. Reference numeral 15 denotes a heat storage tank, in which a number of heat transfer tubes are vertically arranged, and a heat storage medium 16 such as water stored in the tank is cooled by the heat storage heat exchanger 14 formed by connecting the heat transfer tubes. Heating is possible during freezing and heating.

The refrigerant circuit 17 from the heat storage heat exchanger 14 is branched to form a refrigerant circuit 18 and a refrigerant circuit 19. The refrigerant circuit 19 is connected to a second four-way switching valve 20. It is connected to the third valve 21. Reference numeral 22 denotes, for example, a second compressor having a rated horsepower of 3 horsepower, and has a variable operating capacity. The refrigerant circuit 44 is connected to the second compressor 22
Is connected to the second four-way switching valve 20, and the refrigerant circuit 24 connects the second four-way switching valve 20 to the suction side of the second compressor 22. The refrigerant circuit 45 from the second four-way switching valve 20 is branched to form a refrigerant circuit 46 and a refrigerant circuit 47, which are connected to a seventh valve 48 and a fourth valve 25, respectively. The refrigerant circuit 49 from 48 is connected to the second outdoor heat exchanger 50. Reference numeral 51 denotes a sixth valve, which is connected to the second outdoor heat exchanger 50 and the third expansion device 43 by a refrigerant circuit 52 and a refrigerant circuit 53, respectively.

Reference numeral 27 denotes a refrigerant circuit connected to the first valve 8 and a plurality of indoor unit refrigerant circuit systems a, b, and c between the circuit and the refrigerant circuit 28. , Refrigerant circuit 29, second expansion device 30, refrigerant circuit 3
1. The indoor heat exchanger 32 and the refrigerant circuit 33 are sequentially connected.

The refrigerant circuit 34 from the fourth valve 25 is branched to form a refrigerant circuit 35 and the refrigerant circuit 28. The refrigerant circuit 35 is connected to a second valve 36, and is connected to the second valve 36. After the connected refrigerant circuit 37 and the refrigerant circuit 38 connected to the third valve 21 merge, they are connected to the first four-way switching valve 2 and the refrigerant circuit 39. A refrigerant circuit 54 connects the first four-way switching valve 2 and the suction side of the first compressor 1.

In the regenerative air conditioner having the above-described configuration, in the cold storage operation, which is an operation at night, as shown in FIG. 2, the third valve 21, the fifth valve 12, the sixth valve 51, Open the seventh valve 48, close the first valve 8, the second valve 36, and the fourth valve 25,
The first compressor 1 and the second compressor 22 are operated. At this time, the refrigerant discharged from the first compressor 1 is condensed in the first outdoor heat exchanger 4, adiabatically expanded in the first expansion device 6, and then discharged from the second compressor 22, The refrigerant is condensed in the second outdoor heat exchanger 50, merges with the refrigerant that has been adiabatically expanded in the third expansion device 43 at the same pressure, evaporates in the heat storage heat exchanger 14, and removes heat from the heat storage medium 16, for example, water. Heat storage heat exchanger 14
After freezing the surface and distributing the vaporized refrigerant,
Return to the first compressor 1 and the second compressor 22. With this operation, the heat of the low temperature is stored by freezing the heat storage medium 16 or the like.

FIG. 3 shows an operation state during the cold storage operation.
The operating points represented by numerals in the figure indicate the state of the refrigerant at the location corresponding to the reference numeral of the refrigerant circuit shown in FIG. In this operation, this system assumes that there is no residual water in the tank,
Ice making starts at 22:00 and ends at 8:00 the next morning.

The daytime cooling operation will be described below. FIG.
Indicates a cooling operation when the cooling operation is performed only by the first compressor 1 without using the cold storage heat. In the figure, the third valve 2
1, the fourth valve 25 and the fifth valve 12 are closed,
The first compressor 1 is operated. The high-pressure refrigerant condensed and liquefied by the same operation as in FIG. 2 passes through the first expansion device 6 and is then sent to each indoor unit refrigerant circuit system a, b, c. Reduce the pressure while adjusting the refrigerant amount, and
It flows into the indoor heat exchanger 32 at a pressure of about kg / cm ² G and evaporates. At this time, the refrigerant that has absorbed heat from the surrounding room air and gasified passes through the second valve 36 and returns to the first compressor 1.

FIG. 5 shows an operation state during the general cooling operation. The numbers in the figure are as described in FIG. 2, and the condensation temperature is about 45 ° C. and the evaporation temperature is about 10 ° C. In this operation, the system performs, for example, light-load cooling (5 hp or less) after consuming cold storage heat. 00 ~
18:00).

FIG. 6 shows a cooling operation when the first and second compressors are operated simultaneously without using the cold storage heat. In the figure, the first valve 8, the second valve 36, the third valve 21, the fifth valve 12, the sixth valve 51, and the seventh valve
The first throttle device 6 and the third throttle device 43 are fully opened, the fourth valve 25 is closed, and the first compressor 1 and the second compressor 22 are operated. The high-pressure refrigerant condensed and liquefied by the same operation as in FIG. 2 passes through the first expansion device 6, is discharged from the second compressor 22, condensed in the second outdoor heat exchanger 50, and At the same pressure as the refrigerant passing through the expansion device 43, the refrigerant flows into the refrigerant circuit systems a, b,
The pressure is reduced while controlling the amount of refrigerant in each second expansion device 30, and flows into the indoor heat exchanger 32 at a pressure of about 6 kg / cm ² G to evaporate. At this time, the refrigerant that has absorbed heat from the surrounding room air and returned to the first compressor 1 is gasified.

The state during the general cooling operation is the same as that in FIG. 5, and the numbers in the figure are as described in FIG. 2, with the condensation temperature being about 45 ° C. and the evaporation temperature being about 10 ° C. The difference from the general cooling shown in FIG. 4 is the refrigerant circulation amount. The cooling capacity shown in FIG. 4 is, for example, 5 hp, whereas the capacity shown in FIG. 6 is 8 hp. In this operation, the present system performs a cooling operation when the cooling load cannot be covered by the first compressor 1 after the cold storage heat is consumed, for example. The operation time is, for example, a power load concentrated time zone (a time zone in which the power consumption of the air conditioner is large,
１８18: 00) outside.

FIG. 7 shows cooling by cold storage, that is, cooling operation. In the figure, a first throttle device 6, a second valve 3
6, the third valve 21, the sixth valve 51, and the seventh valve 48 are closed, and the first valve 8, the fourth valve 2
5 and the fifth valve 12 are opened, and the second compressor 22 is opened.
To drive. At this time, the gas refrigerant sent out by the second compressor 22 is pressurized to about 9 kg / cm ² G, then cooled by ice in the heat storage tank 15 and condensed at about 22 ° C. After the pressure is reduced to about 6 kg / cm ² G, the refrigerant is sent to each indoor unit refrigerant circuit system a, b, c, and cooled in the same manner as in FIG. At this time, the refrigerant circulation amount of the second compressor 22 is equal to the refrigerant circulation amount of the first compressor 1 in FIG. 4, and the indoor heat exchanger 32 has the same temperature and pressure during general cooling. The same amount of refrigerant flows, and the power difference is about 3 kg / cm ² G.
As for the cooling capacity, FIG.
It becomes the same as the general cooling operation.

FIG. 8 shows an operation state during the cooling operation.
The numbers in the figure are as described in FIG. 2, and the condensation temperature is 22 ° C.
The evaporation temperature is about 10 ° C. In this operation, the system performs cooling at a light load (5 hp or less), for example.

FIG. 9 shows a cooling operation combined with cold storage operation in which the general cooling operation of FIG. 4 and the cooling operation of FIG. 7 are simultaneously operated. In the figure, a third valve 21, a sixth valve 5
The first and seventh valves 48 are closed, and the first valve 8, the second valve 36, the fourth valve 25, and the fifth valve 12 are opened to open the first compressor 1 and the second compressor The machine 22 is operated. At this time, the liquid refrigerant condensed in the heat storage tank 15 on the second compressor 22 side joins with the refrigerant decompressed by the first expansion device 6 on the first compressor 1 side, and the refrigerant circuit system for the indoor unit a , B, c. In this operation, about twice the amount of refrigerant circulates during the general cooling operation in FIG. 4 or the cooling operation in FIG. 7, and the capacity is also doubled.

FIG. 10 shows an operation state during the cooling operation combined with the cold storage heat. The numbers in the figure are as described in FIG.
The evaporation temperature is about 10 ° C. as in other cooling operations, but the condensation temperature is about 45 ° C. in the outdoor heat exchanger 4 and about 22 ° C. in the heat storage heat exchanger 14. In this operation, the system performs cooling under normal cooling load.

Further, in the cooling operation combined with cold storage and heat, when the cooling load is smaller than the normal operation, the operating frequency of the first compressor is controlled by using, for example, an inverter, and when the cooling load is higher than the cooling load by only the cooling operation, It covers up to twice the cooling load of the cold operation.

FIG. 11 shows an operation when the general cooling operation by the first compressor and the cold storage operation by the second compressor in FIG. 4 are performed simultaneously. In the figure, the third valve 21, the fourth valve 25, and the fifth valve 12 are closed, and the first valve 8, the second valve 36, the sixth valve 51, and the seventh valve 48 are opened. Then, the first compressor 1 and the second compressor 22 are operated. At this time, in the general cooling operation by the first compressor, the same operation as the operation shown in FIG. 4 is performed.
The refrigerant in the cold storage operation by the second compressor is discharged from the second compressor 22, condensed in the second outdoor heat exchanger 50, adiabatically expanded in the third expansion device 43, and then heat stored for heat. It evaporates in the exchanger 14, takes heat from the heat storage medium 16, for example, water, freezes the surface of the heat storage heat exchanger 14, and returns the vaporized refrigerant to the second compressor 22. With this operation, the heat of the low temperature is stored by freezing the heat storage medium 16 or the like.

The operating state of FIG. 11 is the same as that of FIG. 5 for the general cooling operation by the first compressor, and the same as that of FIG. 3 for the cool storage operation of the second compressor.
The evaporation temperature in the cold storage operation by the second compressor is about -2 ° C. In this operation, for example, the system performs the ice making operation while performing the cooling operation regardless of the presence or absence of residual ice in the tank.

Although the operation relating to cooling has been described above, the operation relating to heating will be described below. Therefore, unless otherwise specified, the first four-way switching valve 2 and the second four-way switching valve 2 are used.
0 is set to the heating mode. FIG. 12 shows, for example, a heat storage operation at night, that is, a hot water storage operation. In FIG.
First valve 8, second valve 36, fourth valve 2
5, closing the sixth valve 51 and the seventh valve 48,
The first compressor 1 is operated by opening the third valve 21 and the fifth valve 12. At this time, the high-temperature gas refrigerant discharged from the first compressor 1 flows in the direction of the arrow in the drawing, condenses in the heat storage heat exchanger 14 of the heat storage tank 15, and the heat storage medium 16
Is heated. The condensed refrigerant adiabatically expands in the first expansion device 6, absorbs heat from the outside air in the outdoor heat exchanger 4 and evaporates.
Return to the compressor 1.

FIG. 13 shows an operation state during the heat storage operation. The numbers in the figure are as described in FIG. 2, and the boiling temperature of the tank water temperature is about 50 ° C., and the condensation temperature at this time is about 55 ° C.
° C, the evaporation temperature is about 0 ° C. In this operation, the system stores hot water during the nighttime power period and ends the operation as soon as the temperature reaches a predetermined tank water temperature.

The daytime heating operation will be described below. FIG.
Reference numeral 4 denotes a general heating operation when the heating operation is performed only by the first compressor 1 without using the heat storage. In the figure, the first throttle device 6 is fully opened, and the third valve 21 and the fourth valve 2 are opened.
5 and the fifth valve 12 are closed, the first valve 8 and the second valve 36 are opened, and the first compressor 1 is operated. The high-temperature and high-pressure gas discharged from the first compressor 1 at a pressure of about 17 kg / cm ² G is supplied to each of the indoor unit refrigerant circuit systems a,
b, c, condensed in each indoor heat exchanger 32,
Heats room air. The condensed refrigerant is supplied to the second expansion device 3
After the pressure is reduced to about 4 kg / cm ² G at 0 , it is evaporated in the outdoor heat exchanger 4 and thereafter returns to the first compressor 1 by the same operation as in FIG.

FIG. 15 shows an operation state during the general heating operation. The numbers in the figure are as described in FIG. 2. The condensation temperature is about 42 ° C. and the evaporation temperature is about 0 ° C. In this operation, the system performs, for example, light-load heating (5 hp or less) after consuming cold storage heat. 00
１８18: 00).

FIG. 16 shows that the first and second heat pumps are not used and the first and second heat pumps are not used.
Shows the heating operation when the compressors are operated at the same time. In the figure, the first valve 8, the second valve 36, the third valve 21, the fifth valve 12, the sixth valve 51, and the seventh valve 48 are opened, and the first throttle device 6 and the The throttle device 43 of No. 3 is fully opened, the fourth valve 25 is closed, and the first compressor 1 and the second compressor 22 are operated. The high-temperature and high-pressure gas refrigerant discharged from the first compressor and the second compressor are joined in the refrigerant circuit 37, condensed and liquefied by the same operation as in FIG. 4kg / cm
^After the pressure is reduced to ² G, it is distributed at the outlet of the refrigerant circuit 11 and returns to the first compressor 1 and the second compressor 22.

The operating state during this general heating operation is the same as that in FIG. 15, and the numbers in the figure are as described in FIG. 2, with the condensation temperature being about 42 ° C. and the evaporation temperature being about 0 ° C. The difference from the general heating shown in FIG. 14 is the refrigerant circulation amount. The heating capacity shown in FIG. 14 is, for example, 5 hp, whereas the capacity shown in FIG. 16 is 8 hp. In this operation, this system
For example, a heating operation is performed when the heating load cannot be covered by the first compressor 1 after the cold storage heat consumption. The operation time is set, for example, outside the power load concentration time period (time period during which the power consumption of the air conditioner is large, 8:00 to 18:00).

FIG. 17 shows heating by heat storage, that is, a heat dissipation operation. In the figure, the first throttle device 6, the second valve 36, the third valve 21, the sixth valve 51, and the seventh valve 48 are closed, and the first valve 8, the fourth valve 25, and Open the fifth valve 12 and open the second compressor 2
Drive 2 At this time, the gas refrigerant delivered from the second compressor 22 is supplied to each indoor unit refrigerant circuit system a, b, c.
Sent condensed in 17 kg / cm ² about G to be again sucked into the second compressor 22 is heated and vaporized at the evaporation pressure of about 13 kg / cm ² G in the heat storing heat exchanger 14. At this time, the second
The refrigerant circulating amount of the compressor 22 is equal to the refrigerant circulating amount of the first compressor 1 in FIG. 14, and the refrigerant having the same temperature and the same pressure in the indoor heat exchanger 32 as in general heating is used. Since the pressure difference is about 4 kg / cm ² G as power, the heating capacity is equivalent to that of the general heating operation in FIG. .

FIG. 18 shows an operation state during the heat dissipation operation. The numbers in the figure are as described in FIG.
° C and the evaporation temperature is around 35 ° C. In this operation, the present system performs, for example, heating at a light load.

FIG. 19 shows the general heating operation of FIG.
7 shows a heat storage combined heating operation in which the heat dissipation operation of FIG. In the figure, a third valve 21, a sixth valve 5
The first and seventh valves 48 are closed, and the first valve 8, the second valve 36, the fourth valve 25, and the fifth valve 12 are opened to open the first compressor 1 and the second compressor. The machine 22 is operated. At this time, the gas refrigerant discharged from the second compressor 22 merges with the gas refrigerant discharged from the first compressor 1. At this time, the refrigerant circuit systems a, b, and c for the indoor unit are supplied with a high temperature and high pressure of about 17 kg / cm ² G, which is about twice the amount during the general heating operation in FIG. 14 or the heat radiation operation in FIG. The refrigerant circulates, and the capacity is also approximately doubled. About 1/2 kg of the refrigerant of about 13 kg / cm ² G decompressed by the second expansion device 30 flows into the heat storage tank 15 and performs the same operation as the heat dissipation operation in FIG. The pressure is further reduced by the expansion device 6, and the pressure becomes about 4 kg / cm ² G, flows into the outdoor heat exchanger 4, and performs the same operation as the general heating operation in FIG.

FIG. 2 shows an operation state during the heat storage combined heating operation.
0 is shown. The numbers in the figure are as described in FIG. The condensation temperature is about 42 ° C. as in other heating operations, but the evaporation temperature is about 35 ° C. for the heat storage heat exchanger 14 and about 0 ° C. for the outdoor heat exchanger 4. In this operation, the system performs heating when the heating load is concentrated, for example, in the morning.

FIG. 21 shows an operation when the general heating operation by the first compressor 1 and the heat storage operation by the second compressor 22 are simultaneously performed. In the figure, the third valve 21, the fourth valve 25, and the fifth valve 12 are closed, and the first valve 8, the second valve 36, the sixth valve 51, and the seventh valve 48 are opened. Then, the first compressor 1 and the second compressor 22 are operated. At this time, the general heating operation by the first compressor performs the same operation as the operation shown in FIG. The refrigerant in the heat storage operation by the second compressor is the second refrigerant.
Is condensed by the heat storage heat exchanger 14, adiabatically expanded by the third expansion device 43, and then vaporized and vaporized by the second outdoor heat exchanger 50. Return to

The operation state of FIG. 21 is the same as that of FIG. 15 for the general cooling operation by the first compressor, and the same as that of FIG. 13 for the heat storage operation by the second compressor. This system performs the heat storage operation while performing the heating operation in such an operation.

FIG. 22 shows an operation when the general cooling operation by the first compressor 1 and the heat storage operation by the second compressor 22 are simultaneously performed. In the figure, a third valve 21,
The fourth valve 25 and the fifth valve 12 are closed, and the first
, The second valve 36, the sixth valve 51, and the seventh valve 48 are opened, and the first compressor 1 and the second
Is operated. At this time, in the general cooling operation by the first compressor, the same operation as the operation shown in FIG. 4 is performed. The refrigerant in the heat storage operation by the second compressor is the second refrigerant.
Is condensed by the heat storage heat exchanger 14, adiabatically expanded by the third expansion device 43, and then vaporized and vaporized by the second outdoor heat exchanger 50. Return to

The operation state of FIG. 22 is the same as that of FIG. 5 for the general cooling operation by the first compressor, and the same as that of FIG. 13 for the heat storage operation by the second compressor.
In this operation, the system performs the heat storage operation while performing the cooling operation.

FIG. 23 shows an operation when the general heating operation by the first compressor 1 and the cold storage operation by the second compressor are simultaneously performed. In the figure, the third valve 21, the fourth valve 25, and the fifth valve 12 are closed, and the first valve 8, the second valve 36, the sixth valve 51, and the seventh valve
, The first compressor 1 and the second compressor 22 are operated. At this time, the general heating operation by the first compressor performs the same operation as the operation shown in FIG. The refrigerant in the cold storage operation by the second compressor is discharged from the second compressor 22, condensed in the second outdoor heat exchanger 50, adiabatically expanded in the third expansion device 43, and then heat-stored. The gas evaporates in the exchanger 14 and returns to the second compressor 22.

The operating state in FIG. 23 is the same as that in FIG. 15 for the general heating operation by the first compressor, and the same as that in FIG. 12 for the cool storage operation by the second compressor. In this operation, the system performs the cold storage operation while performing the heating operation.

FIG. 24 shows a standard operation pattern diagram during cooling. In the drawing, for example, in the operation time zone of each operation pattern, the cold storage operation is 22:00 to 8:00, and the cooling operation is 8:00 to 22:00. The cold storage operation is a simultaneous operation by the first and second compressors and has a cold storage capacity of 13,000 kc.
al / h, and 13,000k in cold storage hours
cal / h × 10h = 130,000 kcal can be secured.

On the other hand, in the daytime cooling operation, the cooling operation combined with the regenerative heat is performed during the time period when the cooling load of the day is large (load concentration time period). 5 for cooling operation
It has been running horsepower for 10 hours, and the cold storage heat consumption is 1
2500 kcal / h × 10 h = 125000 kcal
+ Although the input of the second compressor is required, it can be covered by the cold storage amount. In this system, the base load of cooling can be covered by this cooling operation. The general cooling portion covers a region where the cooling load fluctuates, and exhibits a cooling capacity of 5 horsepower when the cooling load is maximized.

In the cooling after 18:00, the cooling load is 5
When the power is less than the horsepower, the operation is performed by the general cooling by the first compressor. When the cooling load is 5 hp or more, the general cooling operation is performed by simultaneously operating the first and second compressors.

[0072]

Since the present invention is configured as described above, the following effects can be obtained. According to the present invention, the amount of cold storage heat increases by operating the first compressor and the second compressor simultaneously to perform the cold storage heat operation. Therefore, the cooling / radiating operation which exhibits the same performance as the general cooling / heating by the first compressor in the daytime is performed through the power load concentrated time period (time period when the power consumption of the air conditioner is large, 8:00 to 18:00). Can drive.

According to the present invention, the first compressor and the second compressor are operated at the same time to perform the general cooling / heating operation. Therefore, even if the cooling / heating capacity of the general cooling / heating operation is exceeded, the frequency of operation with insufficient capacity can be greatly reduced.

According to the present invention, the cooling / heating operation using the second compressor is performed at the same time as the general cooling / heating operation performed by operating the first compressor. During the operation time, if the cooling / heating load is equal to or less than the cooling / heating capacity of the first compressor, the cold storage heat is secured by the second compressor. Thereafter, if the load is equal to or less than the cooling / heating capacity of the first compressor, the amount of the cold storage is calculated. Use for cooling or heat radiation
When the load is equal to or greater than the cooling and heating capacity of the first compressor, the amount of the stored heat can be used as a cold source for the combined cooling and cooling operation or a cold source for the storage and heating operation.

That is, for example, when the cooling / heating operation is stopped during a lunch break or the like, or when the air conditioner has a low load especially in the morning and evening or when the heating has a low load in the daytime, it is possible to store the cold storage heat used for the cooling and heating on that day by the second compressor. it can.
Further, the cold storage operation that has been performed after the cooling and heating operation can be started during the cooling and heating operation, or the cold storage operation that has been stopped before the cooling and heating operation can be continuously performed until the cooling and heating operation.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a regenerative air conditioner of a multi air conditioner for buildings as an embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram during the cold storage operation of the embodiment.

FIG. 3 is an operation state diagram in FIG.

FIG. 4 is a refrigerant circuit diagram during a general cooling operation of the embodiment.

FIG. 5 is an operation state diagram in FIG.

FIG. 6 is a refrigerant circuit diagram during a general cooling operation of the embodiment.

FIG. 7 is a refrigerant circuit diagram during the cooling operation of the embodiment.

8 is an operation state diagram in FIG.

FIG. 9 is a refrigerant circuit diagram during the cooling operation combined with cold storage according to the embodiment.

FIG. 10 is an operation state diagram in FIG. 9;

FIG. 11 is a refrigerant circuit diagram when performing the cold storage operation with the general cooling in the embodiment.

FIG. 12 is a refrigerant circuit diagram during the heat storage operation of the embodiment.

13 is an operation state diagram in FIG.

FIG. 14 is a refrigerant circuit diagram during a general heating operation of the embodiment.

FIG. 15 is an operation state diagram in FIG.

FIG. 16 is a refrigerant circuit diagram during a general heating operation of the embodiment.

FIG. 17 is a refrigerant circuit diagram during the heat dissipation operation of the embodiment.

18 is an operation state diagram in FIG.

FIG. 19 is a refrigerant circuit diagram during the heat storage combined heating operation of the embodiment.

20 is an operation state diagram in FIG.

FIG. 21 is a refrigerant circuit diagram when general heating and heat storage operation are simultaneously performed in the embodiment.

FIG. 22 is a refrigerant circuit diagram when general cooling and heat storage operation are simultaneously performed in the embodiment.

FIG. 23 is a refrigerant circuit diagram when the general heating and the cold storage operation are simultaneously performed in the embodiment.

FIG. 24 is a standard operation pattern diagram during cooling in the embodiment.

FIG. 25 is a refrigerant circuit diagram of a conventional regenerative air conditioner for a building multi-air conditioner.

FIG. 26 is a refrigerant circuit diagram during a cold storage operation of a conventional example.

FIG. 27 is an operation state diagram during the cold storage operation in FIG. 26.

FIG. 28 is a refrigerant circuit diagram of a conventional example during a general cooling / heating operation.

29 is an operation state diagram at the time of the general cooling operation in FIG. 28. FIG.

FIG. 30 is a refrigerant circuit diagram of a conventional example during a cooling operation.

31 is an operation state diagram at the time of a cooling operation in FIG. 30. FIG.

FIG. 32 is a refrigerant circuit diagram of a conventional example during a cooling operation combined with cold storage heat.

FIG. 33 is an operation state diagram at the time of the cooling operation combined with cold storage in FIG. 32;

FIG. 34 is a refrigerant circuit diagram during a heat storage operation of a conventional example.

FIG. 35 is an operation state diagram during the heat storage operation in FIG. 34.

FIG. 36 is a refrigerant circuit diagram of a conventional example during a general heating operation.

FIG. 37 is an operation state diagram during a general heating operation in FIG. 36.

FIG. 38 is a refrigerant circuit diagram during a heat dissipation operation of a conventional example.

FIG. 39 is an operation state diagram during the heat dissipation operation in FIG. 38.

FIG. 40 is a refrigerant circuit diagram of a conventional example during a heating operation combined with heat storage.

41 is an operation state diagram at the time of the heat storage combined heating operation in FIG. 40.

FIG. 42 is a standard operation pattern diagram during cooling in a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st compressor 2 1st four-way switching valve 4 1st outdoor heat exchanger 6 1st expansion device 10 1st refrigerant circuit 12 5th valve 14 Heat storage heat exchanger 15 Heat storage tank 18th 2 refrigerant circuit 20 2nd four-way switching valve 21 3rd valve 22 2nd compressor 30 2nd expansion device 32 indoor heat exchanger 38 4th refrigerant circuit 41 3rd refrigerant circuit 43 3rd Restrictor 50 Second outdoor heat exchanger

Continuation of the front page (56) References JP-A-2-219959 (JP, A) JP-A-62-293055 (JP, A) JP-A-62-293056 (JP, A) JP-A 1-247967 (JP, A) JP-A-4-93561 (JP, A) JP-A-3-52561 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 F25B 1/00 F25B 5/00 F25B 13/00

Claims (1)

(57) [Claims] 1. A first compressor, a first four-way switching valve, a first
An outdoor heat exchanger, a first throttle device, a second throttle device,
And a first general cooling / heating circuit formed by sequentially connecting the indoor heat exchanger and a second compressor, a second four-way switching valve, and a second outdoor heat exchange.
Device, the second expansion device, and the indoor heat exchanger in sequence.
A second general cooling / heating circuit formed in succession , the first compressor, the first four-way switching valve, the first outdoor heat exchanger, the first expansion device, and heat storage heat. A first regenerative heat storage circuit formed by sequentially connecting exchangers, the second compressor, the second four-way switching valve, and the second
An outdoor heat exchanger, a third expansion device, and the heat exchange for heat storage.
A second cold storage heat circuit formed by sequentially connecting heat exchangers, the second compressor, the heat storage heat exchanger, and the second throttle.
And a discharge device formed by connecting the indoor heat exchanger sequentially.
A cooling circuit, and a heat storage tank that houses the heat storage heat exchanger, and the first general cooling and heating circuit,
2, a general cooling and heating circuit, a first cold storage heat circuit, and a second storage circuit.
Select a cooling circuit or a cooling / heating circuit.
Cooling and heating, cold storage heat, cold cooling heat,
One of the following modes: cooling / heating / cooling heat, cooling / heating / cooling heat
Operation, and the mode is changed according to a change in load.
Heat storage characterized by switching operation control
Type air conditioner .