JP2974180B2 - Multi-room 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 multi-room cooling / heating apparatus having a heat source side refrigerant cycle and a use side refrigerant cycle, and more particularly to a heat storage system.

[0002]

2. Description of the Related Art Conventionally, a heat storage refrigerant cycle of a multi-room cooling / heating apparatus which is separated into a heat source side refrigerant cycle and a use side refrigerant cycle is disclosed in Japanese Patent Application Laid-Open No. 3-51644.
It was configured as follows.

Hereinafter, description will be made with reference to the drawings. In FIG. 3, 11 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 14 is a cooling decompression device, 15 is a heating decompression device, and 16 is a heating / cooling decompression device 14 for closing. A stop valve, 17 is a check valve for closing the cooling / heating decompression device 15, and 18 is a first auxiliary heat exchanger which connects these in a ring shape,
A heat source side refrigerant cycle is formed. Reference numeral 19 denotes a second auxiliary heat exchanger which is integrally formed so as to exchange heat with the first auxiliary heat exchanger 18. Reference numeral 20 denotes a refrigerant amount adjusting tank for adjusting the amount of refrigerant during cooling and during heating.

[0004] Reference numeral 21 denotes a refrigerant transport device having reversible characteristics in which the refrigerant flows in opposite directions during cooling and during heating, and these are accommodated in an outdoor unit f. 22a, 22b
Is a use-side heat exchanger housed in the indoor units g and h and connected to the outdoor unit f by connection pipes i, i ', j and j'. The second auxiliary heat exchanger 19 and the refrigerant amount adjusting tank 2
0, refrigerant transfer device 21, use side heat exchangers 22a, 22b
The connection pipes i, i ', j, and j' are connected in a ring to form a use-side refrigerant cycle.

[0005] Reference numeral 23 denotes a heat storage tank which is filled with a heat storage material such as water, exchanges heat with the heat storage material and stores heat, and is also provided in series with the second auxiliary heat exchanger 19. A heat-dissipating heat exchanger 25 for exchanging heat with a heat storage material and dissipating heat is provided.

The three-way switching valves 27a and 27b for switching the flow rate of the refrigerant to the first auxiliary heat exchanger and the heat storage heat exchanger 24 are connected to the second auxiliary heat exchanger 19 and the heat radiation heat exchanger 25, respectively. Is a three-way flow valve for adjusting the flow rate of the refrigerant.

[0007] The operation of the multi-room air-conditioning apparatus configured as described above will be described. In the cooling operation, the refrigerant cycle is indicated by a solid line in the drawing. In the heat source-side refrigerant cycle, the high-temperature and high-pressure gas from the compressor 11 passes through the four-way valve 12 and radiates heat in the heat source-side heat exchanger 13 to condense and liquefy. The pressure is reduced by the cooling expansion valve 14, evaporated by the first auxiliary heat exchanger 18, and circulated to the compressor 12 through the four-way valve 12.

At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the use side refrigerant cycle is cooled and liquefied, and the amount of refrigerant is adjusted. The refrigerant is sent to the refrigerant transfer device 21 through the tank 20, and is sent to the use side heat exchangers 22a and 22b through the connection pipes i and j by the refrigerant transfer device 21 to be absorbed and evaporated, gasified, and connected to the connection pipe i ′. , J ′ to the second auxiliary heat exchanger 19.

The heat storage operation of the cooling-time heat source side refrigerant cycle is as follows:
The cooling expansion valve 14 serves as a heat storage expansion valve, and the compressor 11,
Refrigerant from the four-way valve 12, the heat source side heat exchanger, and the check valve 16 passes through the heat storage expansion valve 14, passes through the three-way switching valve 26a, flows to the heat storage heat exchanger 24, exchanges heat with the heat storage material, and absorbs heat. It evaporates and circulates from the four-way valve to the compressor 11 through the three-way switching valve 26b.

On the other hand, during the cooling peak load operation of the use side refrigerant cycle, the heat source side refrigerant cycle is connected to the first auxiliary heat exchanger 1.
The cooling operation from the use-side heat exchangers 22a and 22b passes through the connection pipes i 'and j', and a part of the refrigerant adjusted according to the load passes through the three-way flow valve 27a. From the heat exchanger 25 for heat radiation, cooled and condensed by a heat storage material of about 0 ° C., liquefied, and sent to the three-way flow valve 27b.

The remaining refrigerant adjusted to the load by the three-way flow valve 27a passing through the connection pipes i 'and j' flows from the three-way flow valve 27a to the second auxiliary heat exchanger 19,
Cooled and liquefied by the auxiliary heat exchanger 18 and the three-way flow valve 27
b and merges with the refrigerant from the heat exchanger 25 for heat radiation, and circulates from the refrigerant amount adjustment tank 20 to the refrigerant transport device 21. Therefore, at this time, the cooling capacity of the use side cycle increases substantially as the sum of the capacity of the heat source side refrigerant cycle and the capacity of the heat radiating heat exchanger 25.

On the other hand, during the heating operation, the refrigerant cycle is indicated by a broken line in the drawing. In the heat source side refrigerant cycle, the high-temperature and high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 18, Then, the pressure is reduced from the check valve 17 by the heating depressurizing device 15, absorbed and evaporated by the heat source side heat exchanger 13, and circulated to the compressor 11 through the four-way valve 12. At this time, the second auxiliary heat exchanger 19 of the utilization side refrigerant cycle
And the first auxiliary heat exchanger 18 exchanges heat, and the liquid refrigerant in the use-side refrigerant cycle is heated and gasified, sent to the use-side heat exchanger 22 through the connection pipes i ′ and j ′, and heated. Then, the refrigerant is liquefied and liquefied, passed through the connection pipes i and j, sent to the refrigerant transfer device 21, and circulated from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19.

In the heat storage operation of the refrigerant cycle at the time of heating on the heat source side, the refrigerant from the compressor 11 and the four-way valve 12 is supplied to the three-way switching valve 2.
6b to a heat storage heat exchanger 24, which is cooled and condensed by the heat storage material and liquefied, passes through the three-way switching valve 26a, passes through the check valve 17, is depressurized by the heating expansion valve 15, and is absorbed by the heat source side heat exchanger 13. It evaporates and circulates from the four-way valve 12 to the compressor 11.

On the other hand, during the heating peak load operation of the use side refrigerant cycle, the heat source side refrigerant cycle is switched to the three-way switching valve 26a,
6b is switched to perform a normal heating operation using the first auxiliary heat exchanger 18 as a condenser. At this time, the use side heat exchangers 22a, 22
The refrigerant that has been condensed by the heat radiation in b passes through the connection pipes i and j and is sent from the refrigerant transport device 21 to the three-way flow valve 27b through the refrigerant amount adjustment tank 20. In the three-way flow valve 27b, a part of the refrigerant is sent to the heat radiating heat exchanger 25 to be heated and gasified by the heat storage material according to the load, and the remaining refrigerant is sent to the second auxiliary heat exchanger 19, (1) Heat gasification in the auxiliary heat exchanger 18, the respective gas refrigerants merge at the three-way flow valve 27a, and pass through the connection pipes i 'and j', and the use side heat exchanger 22
a, circulating to 22b.

Therefore, at this time, the heating capacity of the use-side refrigerant cycle increases substantially as the sum of the heating capacity of the heat-source-side refrigerant cycle and the capacity of the heat radiating heat exchanger 25.

[0016]

However, in the above-described structure, the internal volume of the heat radiation heat exchanger 25 is increased, so that the amount of refrigerant in the use-side refrigerant cycle is increased and a large amount of heat is stored in the heat radiation heat exchanger 25. There is a problem that the refrigerant stagnates in the heat transfer device, the load on the refrigerant transfer device 11 increases during the heat storage utilization operation, and a large amount of the liquefied refrigerant in the heat radiating heat exchanger 25 flows into the refrigerant transfer device 11 and is damaged by liquid compression.

Further, if the temperature of the heat storage material in the heat storage tank is higher than the refrigerant temperature of the use-side refrigerant cycle in cooling and lower in heating, the performance of the heat storage material cannot be improved. There were few issues.

In view of the above problems, the multi-room cooling / heating device of the present invention reduces the amount of refrigerant in the use-side refrigerant cycle, reduces the load on the refrigerant transport device due to liquefied refrigerant, and prevents damage to the refrigerant transport device due to liquid compression. Is what you do.

Further, in addition to the above objects, the temperature range of use of the heat storage material is expanded to increase the energy saving by effectively utilizing the heat storage.

[0020]

In order to solve the above-mentioned problems, a multi-room cooling / heating apparatus according to the present invention comprises a compressor, a heat source side four-way valve, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger. A heat source-side refrigerant cycle connected in an annular manner, a second auxiliary heat exchanger formed integrally with the first auxiliary heat exchanger and exchanging heat, a refrigerant transfer device and a plurality of utilization-side heat exchangers, (2) a use-side refrigerant cycle having a first auxiliary heat exchanger for heat dissipation in series with the auxiliary heat exchanger; a heat exchanger for heat storage in parallel with the first auxiliary heat exchanger; and the first auxiliary heat exchanger for heat dissipation. A second auxiliary heat exchanger for heat radiation integrally formed with the heat exchanger, and a heat radiation circuit in which the second auxiliary heat exchanger for heat radiation, a heat storage material transfer device and a heat storage tank having the heat storage heat exchanger are connected in a ring shape. It has.

Also, a heat source side refrigerant cycle in which a compressor, a heat source side four-way valve, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger are connected in a ring, and the first auxiliary heat exchanger is integrated with the heat source side refrigerant cycle. A second auxiliary heat exchanger formed and heat-exchanged, a refrigerant transfer device and a plurality of utilization side heat exchangers, and a utilization side refrigerant having a first auxiliary heat exchanger for heat radiation in series with the second auxiliary heat exchanger A cycle, a heat exchanger for heat storage in parallel with the first auxiliary heat exchanger, a heat source side heat exchanger between the heat source side heat exchanger and the pressure reducing device, and the heat dissipation first auxiliary heat exchanger. A second heat-dissipating auxiliary heat exchanger integrally formed and exchanging heat;
A heat radiating circuit is provided in which a heat storage tank having an auxiliary heat exchanger, a heat storage material conveying device, and the heat storage heat exchanger and a heat source side heat radiating heat exchanger is connected in a ring shape.

[0022]

According to the multi-room cooling / heating apparatus of the present invention, the above configuration eliminates the heat radiation heat exchanger in the heat storage tank, so that the amount of refrigerant in the use-side refrigerant cycle can be reduced and the heat radiation heat exchanger can be used. Liquefaction of the refrigerant is eliminated.

Further, the temperature of the heat storage material is higher than the temperature of the use-side refrigerant cycle during cooling and can be used at a lower temperature during heating.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a multi-room air conditioner according to a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a refrigerant cycle of a multi-room cooling / heating apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 30 denotes a first auxiliary heat exchanger for heat dissipation provided in series with the second auxiliary heat exchanger 19 and radiates heat storage to the use-side refrigerant cycle, and 31 denotes a first auxiliary heat exchanger 30 for heat dissipation. A second auxiliary heat exchanger for heat radiation that exchanges heat with the heat exchanger;
Reference numeral 32 denotes a heat storage material transporting device that circulates the heat storage material from the second auxiliary heat exchanger 31 for heat radiation to the heat storage tank 23, and reference numeral 33 connects the second auxiliary heat exchanger 31 for heat release, the heat storage material transporting device 32, and the heat storage tank 23. This is a heat dissipation circuit, and the other configuration is the same as that of the conventional example. Here, the same reference numerals are used and the description thereof is omitted.

The operation of the refrigerant cycle is the same as that of the conventional example, and a detailed description thereof will be omitted. However, a description will be given below of a heat storage utilization operation of a utilization-side refrigerant cycle different from the conventional example.

In FIG. 1, during the peak load operation of the cooling and heating, the operation of the utilization-side refrigerant cycle and the operation of the heat storage material transfer device 3 are performed.
2, the second auxiliary heat exchanger 31 for heat dissipation is cooled or heated, and heat is added to the capacity of the refrigerant cycle on the heat source side by the first auxiliary heat exchanger 30 for heat dissipation, thereby increasing the capacity of the use side refrigerant cycle. Let it.

As described above, according to the present embodiment, the heat-exchanger 24 is formed integrally with the heat-storing heat exchanger 24 and the heat-radiating first auxiliary heat exchanger 30 in parallel with the first auxiliary heat exchanger 18. A second auxiliary heat exchanger 31 for heat dissipation, and a heat radiating circuit 33 in which the heat storage tank 23 having the second auxiliary heat exchanger 31 for heat dissipation, the heat storage material transfer device 32, and the heat exchanger 24 for heat storage are connected in a ring shape. By storing heat at night, heat storage is added to the capacity of the heat source side refrigerant cycle at the time of a peak load during cooling and heating, and it is possible to cope with the peak load. Therefore, the compressor 11
And the equipment capacity can be reduced. In addition, the amount of refrigerant in the usage-side refrigerant cycle can be reduced, and liquid compression due to the inflow of a large amount of liquefied refrigerant into the refrigerant transport device 21 can be eliminated, and damage to the refrigerant transport device 21 can be prevented.

Next, the second embodiment of the multi-room cooling and heating apparatus according to the present invention will be described.
Will be described with reference to the drawings, the same reference numerals will be given to the same components as those in the first embodiment, and detailed description thereof will be omitted.

In FIG. 2, reference numeral 34 denotes a heat-source-side heat-dissipating heat exchanger provided in the heat storage tank 23, and reference numerals 35a and 35b denote three-way switching valves for switching refrigerant flow to the heat-source-side heat-dissipating heat exchanger 34. Is the same as that of the conventional example and the first embodiment. Here, the same reference numerals are used, and the description is omitted.

The operation of the refrigerant cycle is the same as that of the conventional example and the first embodiment, and the detailed description is omitted. However, a description will be given of the heat storage utilizing operation different from the conventional example and the first embodiment. Perform the following.

In FIG. 2, when the temperature of the heat storage material is higher than the refrigerant temperature in the use side refrigerant cycle during the peak load operation of the cooling and heating, the heat storage material transfer device 32 is operated together with the operation of the use side refrigerant cycle to release the heat. Second auxiliary heat exchanger 31
Is cooled or heated, and heat is added to the capacity of the heat source-side refrigerant cycle by the first heat-radiating auxiliary heat exchanger 30 to increase the capacity of the use-side refrigerant cycle.

If the temperature of the heat storage material is lower than the temperature of the refrigerant in the use-side refrigerant cycle, the heat storage material transport device 32 is stopped, and the three-way switching valves 35a and 35b are operated to operate the heat source side heat-radiating heat exchanger 34. The refrigerant of the heat source side refrigerant cycle flows through the refrigerant. At this time, in cooling, the degree of subcooling of the refrigerant in the heat source side refrigerant cycle increases, the capacity of the heat source side refrigerant cycle increases, and the capacity of the use side refrigerant cycle also increases.

In the heating operation, the heat source side heat radiating heat exchanger 34 is used.
Becomes an evaporator, and the capacity of the heat source side refrigerant cycle increases due to the increase of the evaporation capacity, and the capacity of the use side refrigerant cycle also increases.

As described above, according to the present embodiment, the heat-source-side heat exchanger 24 is disposed in parallel with the first auxiliary heat exchanger 18, and the heat-source-side radiator is disposed between the heat source-side heat exchanger 13 and the pressure reducing devices 14 and 15. Heat exchanger 34, a second auxiliary heat exchanger 31 for heat radiation that is formed integrally with the first auxiliary heat exchanger 30 for heat exchange, a second auxiliary heat exchanger 31 for heat radiation, and a heat storage material transport device 32 And a heat radiating circuit 33 in which a heat storage tank 23 having a heat storage heat exchanger 24 and a heat source side heat radiating heat exchanger 34 is connected in a ring shape. Since heat storage is added to the capacity of the heat source side refrigerant cycle and it is possible to cope with a peak load, the capacity of the compressor 11 can be reduced and the installed capacity can be reduced. In addition, while reducing the amount of refrigerant in the use-side refrigerant cycle, the refrigerant transport device 2
The liquid compression due to the inflow of a large amount of liquefied refrigerant into the liquefied refrigerant 1 can be eliminated, and the refrigerant transport device 21 can be prevented from being damaged. Further, since the heat-source-side heat-radiating heat exchanger 34 is provided, the refrigerant temperature of the use-side refrigerant cycle is higher in cooling than in the heat storage material, lower in heating, and the heat source-side refrigerant cycle cannot be used directly. And the capacity of the use-side refrigerant cycle can be increased. Therefore, the use range of the heat storage temperature can be expanded.

In this embodiment, the use of heat storage by operating the heat source side refrigerant cycle has been described. However, in some cases, a cooling and heating operation using only heat storage without operating the heat source side refrigerant cycle is also possible. Needless to say, the rise characteristics are improved by the use.
In the embodiment, the outdoor unit including the heat storage tank is used. However, the heat storage tank may be separated from the outdoor unit.

[0038]

As described above, the multi-room air conditioner of the present invention comprises a heat source comprising a compressor, a heat source side four-way valve, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger connected in a ring shape. Side refrigerant cycle, a second auxiliary heat exchanger integrally formed with the first auxiliary heat exchanger and exchanging heat, a refrigerant transfer device and a plurality of utilization side heat exchangers, and a series with the second auxiliary heat exchanger. A use-side refrigerant cycle having a first auxiliary heat exchanger for heat dissipation, a heat exchanger for heat storage in parallel with the first auxiliary heat exchanger, and heat exchange formed integrally with the first auxiliary heat exchanger for heat dissipation. A second auxiliary heat exchanger for heat dissipation, and a heat dissipation circuit in which the second auxiliary heat exchanger for heat dissipation, a heat storage material transporting device, and a heat storage tank having the heat exchanger for heat storage are connected in a ring shape. The heat source side refrigerant cycle capacity during peak loads during cooling and heating. Thermal storage is exerted, it is possible to cope with peak loads. Therefore, the capacity of the compressor can be reduced and the installed capacity can be reduced. In addition, the amount of refrigerant in the usage-side refrigerant cycle can be reduced, and liquid compression due to the inflow of a large amount of liquefied refrigerant into the refrigerant transport device can be eliminated, and damage to the refrigerant transport device can be prevented.

Further, since the heat source side heat radiating heat exchanger is provided, even when the refrigerant temperature of the utilization side refrigerant cycle is higher in cooling than in the heat storage material and lower in heating, the heat storage cannot be used directly. It is possible to improve the capacity of the heat source side refrigerant cycle and increase the capacity of the use side refrigerant cycle. Therefore, the range of use of the heat storage temperature can be expanded, and further energy saving can be performed.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of a multi-room cooling / heating apparatus according to a first embodiment of the present invention.

FIG. 2 is a refrigeration cycle diagram of a multi-room cooling / heating device according to a second embodiment of the present invention.

FIG. 3 is a refrigeration cycle diagram of a conventional multi-room cooling / heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Heat source side heat exchanger 18 1st auxiliary heat exchanger 19 2nd auxiliary heat exchanger 21 Refrigerant conveying device 22a, 22b User side heat exchanger 23 Heat storage tank 24 Heat storage heat exchanger 30 Radiation first auxiliary heat exchanger 31 second auxiliary heat exchanger for heat dissipation 32 heat storage material transport device 33 heat dissipation circuit 34 heat exchanger for heat dissipation on the heat source side

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25B 1/00 399 F25B 13/00 351

Claims (2)

(57) [Claims] 1. A heat source side refrigerant cycle in which a compressor, a heat source side four-way valve, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger are connected in a ring shape, and integrated with the first auxiliary heat exchanger. A second auxiliary heat exchanger formed and heat-exchanged, a refrigerant transfer device and a plurality of utilization side heat exchangers, and a utilization side refrigerant having a first auxiliary heat exchanger for heat radiation in series with the second auxiliary heat exchanger A cycle, a heat storage heat exchanger in parallel with the first auxiliary heat exchanger, a heat release second auxiliary heat exchanger formed integrally with the heat release first auxiliary heat exchanger and exchanging heat, A multi-room air-conditioning / heating apparatus including a heat dissipation circuit in which a second auxiliary heat exchanger, a heat storage material transfer device, and a heat storage tank having the heat storage heat exchanger are connected in a ring shape. 2. A heat-source-side refrigerant cycle in which a compressor, a heat-source-side four-way valve, a heat-source-side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger are connected in a ring shape, and integrated with the first auxiliary heat exchanger. A second auxiliary heat exchanger formed and heat-exchanged, a refrigerant transfer device and a plurality of utilization side heat exchangers, and a utilization side refrigerant having a first auxiliary heat exchanger for heat radiation in series with the second auxiliary heat exchanger A cycle, a heat exchanger for heat storage in parallel with the first auxiliary heat exchanger, a heat source side heat exchanger between the heat source side heat exchanger and the pressure reducing device, and the heat dissipation first auxiliary heat exchanger. Heat storage including a heat-dissipating second auxiliary heat exchanger integrally formed and exchanging heat, the heat-dissipating second auxiliary heat exchanger, a heat storage material conveying device, and the heat storage heat exchanger and a heat source side heat radiation heat exchanger. A multi-room air-conditioning and heating system equipped with a heat-dissipation circuit that connects the tank in a ring shape.