JPH10281579A - Heat storage type air conditioning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the amount of consumption of cold storage heat by previously effectively cooling a refrigerant proior to heat exchange of a heat storage medium. SOLUTION: A refrigerant circuit 101 includes a main refrigerant circuit 103 where there are connected annularly a compressor 1, an outdoor heat exchanger 3, indoor expansion valves 6, 6,... and indoor heat exchangers 5, 5,..., and a heat storage circuit 104. A heat dissipation heat exchanger 8 different from the outdoor heat exchanger 3 is provided on the heat storage circuit 104. Although the heat dissipation heat exchanger 8 is constructed with the outdoor heat exchanger 3 in an integrated faschion, its refrigerant path is different. Upon cooling operation using cold storage heat before a refrigerant is cooled with cold water in a preheater 11, it is cooled with outdoor air in the heat dissipation heat exchanger 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative air conditioner, and more particularly to an improvement in the efficiency of cold storage.

[0002]

2. Description of the Related Art In recent years, for the purpose of cutting power peaks,
An ice regenerative air conditioner has been developed in which ice is generated and stored at night using inexpensive late-night power, and the ice is used as a cold source for daytime cooling.

[0003] As such an ice storage type air conditioner,
For example, an air conditioner as disclosed in Japanese Patent Application Laid-Open No. 7-301438 is known. As shown in FIG. 10, this air conditioner includes a compressor (c), an outdoor heat exchanger
(d), a thermal storage circuit in which an ice thermal storage device (g) is provided in a main refrigerant circuit (a) composed of an electronic expansion valve (e) and an indoor heat exchanger (f)
(b) is added.

[0004] In the cold storage operation for making ice, the refrigerant is
It circulates as shown by the solid arrow in the figure. On the other hand, at the time of the cold storage utilizing cooling operation in which the cooling heat is recovered and the cooling operation is performed, the refrigerant circulates as indicated by the dashed arrow in the drawing.

[0005] In the cooling operation utilizing cold storage, the refrigerant is cooled in advance by an outdoor heat exchanger before exchanging heat with cold water in the ice storage device (g). Therefore, compared with the case where all cooling of the refrigerant is performed by the ice heat storage device (g), the consumption of the cold storage is reduced by the amount of the outdoor air used as a part of the cold heat source. That is, the efficiency of using cold storage is improved.

[0006]

However, the amount of heat to be cooled in advance by the outdoor air is smaller than the amount of heat of condensation. Therefore, if the refrigerant simply flows into the outdoor heat exchanger as in the air conditioner, a portion where heat exchange is not effectively performed occurs. That is, since the amount of heat to be radiated is small, the size of the outdoor heat exchanger is relatively excessive. Therefore, there is a problem that the pressure loss of the refrigerant increases due to the size of the heat exchanger.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object of the present invention is to efficiently cool a refrigerant before exchanging heat with a heat storage medium and reduce the consumption of cold heat. It is in.

[0008]

Means for Solving the Problems To achieve the above object, the present invention provides an exclusive heat exchanger for cooling gas refrigerant discharged from a compressor (1) separately from an outdoor heat exchanger (3). Heat exchanger (8).

Thus, during the cooling operation utilizing the cold storage heat, an appropriate amount of heat exchange is performed with respect to the refrigerant before being cooled by the heat storage medium, and efficient operation without waste is performed.

Specifically, the means adopted by the invention of claim 1 includes a compressor (1), an outdoor heat exchanger (3), and a pressure reducing means.
(6), and a main refrigerant circuit (103) in which an indoor heat exchanger (5) is connected in order to form an annular closed circuit, and a heat storage heat exchanger (9) that generates a supercooled heat storage medium And a heat storage recovery heat exchanger (1) for recovering heat storage by exchanging heat between a refrigerant and a heat storage medium.
And a heat storage circuit (104) having a heat storage circuit (104), and during the cold storage operation, the condensed refrigerant flows from the main refrigerant circuit (103) to the heat storage circuit (104), and the refrigerant is evaporated in the heat storage heat exchanger (9). Let the compressor (1)
On the other hand, during cooling operation using cold storage, the refrigerant discharged from the compressor (1) is condensed in the heat storage and recovery heat exchanger (11) to reduce the pressure.
Returning to the main refrigerant circuit (103) from upstream of (6), the indoor heat exchanger
In the regenerative air conditioner that circulates refrigerant so as to evaporate in (5), the refrigerant discharged from the compressor (1) exchanges heat with outdoor air on the upstream side of the heat storage recovery heat exchanger (11). After the cooling and cooling, the heat exchanger for heat dissipation (8) to be supplied to the heat exchanger for heat storage and recovery (11) is provided.

According to the above invention, the heat exchanger for radiating heat is provided.
Heat exchange is performed between the refrigerant and the outdoor air via (8). As a result, an appropriate amount of heat exchange is performed on the refrigerant before being cooled by the heat storage medium, and efficient operation without waste is performed.

According to a second aspect of the present invention, there is provided a regenerative air conditioner according to the first aspect, wherein
(1) is the first compressor that raises the refrigerant pressure from low pressure to high pressure
(1a) and a second compressor (1b) for increasing the pressure of the refrigerant from the low pressure to an intermediate pressure lower than the high pressure, and discharged from the first compressor (1a) during the cold storage utilizing cooling operation. The refrigerant is condensed in the outdoor heat exchanger (3), while the refrigerant discharged from the second compressor (1b) is cooled in the heat-exchanging heat exchanger (8), and thereafter, is cooled. ), The refrigerant is circulated so as to be condensed.

According to the above-mentioned invention, the refrigerant condenses at two different pressures and condenses at two different temperatures. As a result, the refrigerant with a high condensation temperature exchanges heat with the outdoor air, while the refrigerant with a low condensation temperature exchanges heat with the outdoor air in the heat exchanger for heat dissipation (8), and then the heat exchanger for heat storage and recovery. In step (11), heat exchange is performed with the heat storage medium. Therefore, an appropriate amount of heat exchange is performed with respect to the refrigerant before being cooled by the heat storage medium, and efficient operation without waste is performed.

According to a third aspect of the present invention, there is provided a regenerative air conditioner according to the first aspect, wherein the outdoor heat exchanger (3) comprises an air-cooled heat exchanger; 3) and a heat exchanger for heat dissipation (8) are integrated.

According to the invention, the heat exchanger for radiating heat is provided.
(8) Installation space is reduced.

According to a fourth aspect of the present invention, in the regenerative air conditioner according to the third aspect, the outdoor heat exchanger (3) and the heat radiating heat exchanger (8) are arranged at predetermined intervals. The heat exchanger includes a plate fin tube type heat exchanger in which a plurality of heat transfer tubes pass through the arranged plate fin group, and the plurality of heat transfer tubes form a first heat transfer passage forming a refrigerant path of the outdoor heat exchanger (3). It is configured to have a heat tube group and a second heat transfer tube group forming a refrigerant path of the heat exchanger for heat dissipation (8).

According to the specific features of the invention, the outdoor heat exchanger (3) and the heat radiating heat exchanger (8) are integrated with a specific configuration. In addition, the same plate fin is used for the outdoor heat exchanger.
The fins of (3) and the heat exchanger (8) for heat radiation are shared.

According to a fifth aspect of the present invention, in the regenerative air conditioner according to the third aspect, the outdoor heat exchanger (3) and the heat radiating heat exchanger (8) are connected to the outdoor heat exchanger (8). Heat exchanger
The configuration is such that a blower (12) for supplying air to both (3) and the heat exchanger for heat dissipation (8) is provided.

According to the invention, the heat exchanger for radiating heat is provided.
There is no need to separately provide a blower (16) for (8), and the air conditioner is configured at low cost.

The means taken by the invention according to claim 6 is that a compressor (1), an outdoor heat exchanger (3), a pressure reducing means (6), and an indoor heat exchanger (5) are connected in this order to form a ring. A main refrigerant circuit (103) configured as a closed circuit, a heat storage heat exchanger (9) that generates a supercooled heat storage medium, and heat storage recovery that recovers heat by exchanging heat between the refrigerant and the heat storage medium. A heat storage circuit (104) having a heat exchanger (11), a heat storage medium conveying means (20), the heat storage recovery heat exchanger (11), the heat storage heat exchanger (9), a heat storage medium. A heat storage tank (21) for canceling a supercooled state and storing heat is connected in order and a heat storage medium circuit (102) configured in an annular closed circuit, and condensed from the main refrigerant circuit (103) during cold heat storage operation. Flow the refrigerant to the heat storage circuit (104), the refrigerant for heat storage heat exchanger (9)
While returning to the compressor (1), the refrigerant discharged from the compressor (1) is transferred to the heat exchanger (1)
Condensed in 1) and the main refrigerant circuit (103) from upstream of the pressure reducing means (6)
In the regenerative air conditioner in which the refrigerant is circulated so as to evaporate in the indoor heat exchanger (5), the heat storage medium circuit
Condensed water storage means (25) for storing dew water generated in (102)
Is provided, on the upstream side of the heat storage and recovery heat exchanger (11), a heat radiation heat exchanger (8) for cooling the refrigerant discharged from the compressor (1) by exchanging heat with the condensed water. However, it is configured such that it is disposed so as to be immersed in the dew water stored in the dew water storage means (25) with respect to the dew water storage means (25).

According to the above-described invention specific matter, the refrigerant before flowing into the heat storage / recovery heat exchanger (11) is cooled not by the outdoor air but by the dew condensation water. Therefore, since the heat exchange is performed with the liquid having good heat transfer, the refrigerant is easily cooled. Therefore, the heat-exchanging heat exchanger (8) is downsized. In addition, since the cold heat is recovered from the condensed water that has been conventionally wasted, the effective use of the cold storage is further promoted. Further, the fan (16) for the heat exchanger (8) for heat radiation is not required.

[0022]

Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

-Configuration of Air Conditioner (100)-As shown in FIG. 1, the regenerative air conditioner (1
(00) is an air conditioner equipped with a so-called dynamic ice heat storage device, and a refrigerant circuit (101) in which refrigerant circulates,
And a water circuit (102) in which water as a heat storage medium circulates.

The refrigerant circuit (101) has a main refrigerant circuit (103) for cooling or heating indoor air with the indoor heat exchanger (5);
A heat storage circuit (104) for storing heat by giving cold or warm water to water in the water circuit (102).

The main refrigerant circuit (101) includes a compressor (1), a four-way switching valve (2), an outdoor heat exchanger (3), a first solenoid valve (SV1),
A first expansion valve (4) and a plurality of indoor expansion valves arranged in parallel
(6,6,…) and indoor heat exchanger (5,5,…) and accumulator
And (7) are connected in order to form an annular closed circuit. The compressor (1) includes a first compressor (1) having an unloader mechanism.
a) and a variable capacity type second compressor (1b). The discharge pipes of the first compressor (1a) and the second compressor (1b) are provided with check valves for preventing a backflow of the refrigerant. The outdoor heat exchanger (3) is an air-cooled heat exchanger and is composed of a plate-fin tube type heat exchanger.

On the other hand, the heat storage circuit (104) has an upstream end (104a) connected between the outdoor heat exchanger (3) and the first solenoid valve (SV1),
The downstream end (104b) is connected between the four-way switching valve (2) and the accumulator (7). The heat storage circuit (104) includes, in order from the upstream end (104a), a sixth solenoid valve (SV6), a preheater (11) serving as a heat storage recovery heat exchanger, a third expansion valve (10), and a heat storage heat exchanger. An exchanger (9) is provided. The preheater (11) is composed of a double-pipe heat exchanger as a liquid-liquid heat exchanger,
It is configured such that a refrigerant flows inside the inside and water serving as a heat storage medium flows outside the inside. Heat storage heat exchanger (9)
Is composed of a shell-and-tube heat exchanger.

The heat storage circuit (104) further includes a heat storage recovery circuit (108), a heat radiation circuit (105), a seed ice generation circuit (106), and an ice growth prevention circuit (107).

The heat storage recovery circuit (108) is a circuit for recovering cold or warm heat stored in the water circuit (102) and using it for cooling or heating. One end of heat storage recovery circuit (108)
(108a) is the preheater (11) of the heat storage circuit (104) and the third expansion valve (1).
0), and the other end (108b) is connected to the main refrigerant circuit (103).
Are connected between the first expansion valve (4) and each of the indoor expansion valves (6, 6,...).

The radiating circuit (105) is provided for cooling the high-temperature refrigerant discharged from the compressor (1) with the cold water of the water circuit (102).
This is a circuit for cooling by outdoor air in advance. The upstream end (105a) of the heat dissipation circuit (105) is connected between the discharge side of the compressor (1) and the four-way switching valve (2), and the downstream end (105b) is connected to the sixth solenoid valve (SV6). It is connected between the preheater (11). A second solenoid valve provided in parallel to the heat dissipation circuit (105)
(SV2) and a third solenoid valve (SV3), and a fifth solenoid valve (SV5) and a heat-dissipating heat exchanger (8) are provided. In parallel with the fifth solenoid valve (SV5) and the heat radiation heat exchanger (8), the fourth solenoid valve (SV5)
V4). The heat-dissipating heat exchanger (8) is an air-cooled heat exchanger, and is composed of a plate-fin tube type heat exchanger smaller than the outdoor heat exchanger (3). A blower (16) for supplying outdoor air to the heat exchanger for heat dissipation (8) is provided behind the heat exchanger for heat dissipation (8).

The seed ice generating circuit (106) is a circuit for generating seed ice for eliminating supercooling on the inner wall of the pipe of the water circuit (102). The upstream end (106a) of the seed ice generating circuit (106)
The downstream end (106b) is connected between the expansion valve (10) and the upstream end (108a) of the heat storage recovery circuit (108), and the downstream end (106) of the heat storage heat exchanger (9) and the heat storage circuit (104). 104b).
The seed ice generating circuit (106) includes a seventh solenoid valve (SV7), a capillary tube (CP), and a seed ice generator (14).

The ice progress prevention circuit (107) includes a seed ice generator (14).
Heat exchanger for heat storage as the seed ice generated in
This is a circuit for warming the water pipe immediately after the outlet of the heat storage heat exchanger (9) so as not to flow into (9). Ice progress prevention circuit (1
07) is connected between the upstream end (104a) of the heat storage circuit (104) and the downstream end (105b) of the heat dissipation circuit (105), and the downstream end (107b) is connected to the heat storage and recovery circuit. It is connected between the upstream end (108a) of (108) and the upstream end (106a) of the seed ice generating circuit (106). The ice growth prevention circuit (107) is provided with an ice growth prevention means (15) including an eighth solenoid valve (SV8), a capillary tube (CP), and a double tube heat exchanger.

The above is the configuration of the refrigerant circuit (101). Next, the configuration of the water circuit (102) will be described.

The water circuit (102) includes a pump (20) and a preheater (1).
1), mixer (23), heat exchanger for heat storage (9), subcooler (2)
4) and the heat storage tank (21) are connected in order to form a closed circuit. The mixer (23) is provided with a preheater (11) when generating supercooled water.
The ice nuclei contained in the cold water are melted by mixing and stirring the cold water heated in the above step, thereby preventing the ice nuclei from being mixed into the heat storage heat exchanger (9). The supercooling eliminator (24) mixes and agitates supercooled water to eliminate the supercooled state, and generates slurry ice. The heat storage tank (21) is a tank for storing ice and cold water in a slurry state for cold heat storage and for storing hot water for hot heat storage, and a water pipe is connected to a lower portion thereof.

-Operation of Air Conditioning Apparatus (100)-Next, regarding the operation of the air conditioning apparatus (100), a cold storage operation in which cold heat is stored and a cooling operation using cold storage in which cooling is performed using cold storage. It will be described in order.

-Cold heat storage operation- In the cold heat storage operation, the refrigerant circulates as shown by the solid arrow in FIG. 2, and the water circulates as shown by the dashed arrow. Specifically, circulation is performed as follows.

In the refrigerant circuit (101), the gas refrigerant discharged from the compressor (1) passes through the four-way switching valve (2) and flows into the outdoor heat exchanger (3). In the outdoor heat exchanger (3), the gas refrigerant is condensed and turns into a liquid refrigerant. The liquid refrigerant flows into the heat storage circuit (104), a part of the refrigerant is diverted to the ice progress prevention circuit (107), and the other part flows through the heat storage circuit (104) as it is.
The refrigerant flowing through the heat storage circuit (104) is supplied to the water circuit (10) by the preheater (11).
2) Heat exchange with water to preheat water. Then, while a part of the refrigerant is diverted to the seed ice generating circuit (106), the other part of the refrigerant is decompressed and expanded in the third expansion valve (10) to become a low-temperature and low-pressure two-phase refrigerant and heat exchange for heat storage. It flows into the vessel (9). In the heat storage heat exchanger (9), the two-phase refrigerant evaporates and
The water circulating in (102) is cooled to a supercooled state. After the evaporated refrigerant flows out of the heat storage heat exchanger (9), the heat storage circuit (104)
From the downstream end (104b) to the main refrigerant circuit (103), and is sucked into the compressor (1) via the accumulator (7).

The refrigerant diverted to the ice progress prevention circuit (107)
The water circulating in the water circuit (102) is heated by the ice development preventing means (15), and merges with the refrigerant flowing in the heat storage circuit (104) at the downstream end (107b).

The refrigerant diverted to the seed ice generating circuit (106) expands in the seed ice generator (14), cools and cools the water in the water pipe, and generates seed ice on the inner wall of the water pipe. Then, at the downstream end (1
06b), the heat storage circuit flowing out of the heat storage heat exchanger (9)
Merges with the refrigerant of (104).

On the other hand, in the water circuit (102), the heat storage tank (2
The cold water in 1) is sucked by a pump (20) and stored in a heat storage tank (21).
Spill out of. The cold water discharged from the pump (20) is heated in the preheater (11). The heated water is added to the mixer (2
In (3), the ice nuclei contained in the cold water are melted by stirring and mixing. And cold water that no longer contains ice nuclei
The refrigerant flows into the heat storage heat exchanger (9), is cooled by the refrigerant flowing through the refrigerant circuit (101), and turns into supercooled water. After the supercooled water flows out of the heat storage heat exchanger (9), it passes through the ice growth preventing means (15), and in the seed ice generator (14), the seed ice generated on the inner wall of the water pipe is removed. Contact and the supercooled state is eliminated. This water is mixed and stirred in the supercooling eliminator (24), the supercooling state is completely eliminated, and the slurry becomes ice. After the ice flows out of the supercooler (24), the ice accumulates in the heat storage tank (21).
Is stored in

As described above, ice as a cold heat source is stored in the heat storage tank (21). That is, cold heat is stored.

-Cooling operation utilizing cold storage heat-The cooling operation utilizing cold storage heat is an operation which is a feature of the present invention. The refrigerant circulates as shown by the solid arrow in FIG. 3, and the water circulates as shown by the dashed arrow. Specifically, circulation is performed as follows.

In the refrigerant circuit (101), the gas refrigerant discharged from the compressor (1) flows into the heat radiation circuit (105) and flows into the heat radiation heat exchanger (8). And heat exchanger for heat dissipation (8)
In, the sensible heat is changed by cooling to the outdoor air. That is, as schematically shown in FIG. 4, the amount of heat input to the compressor (1) is released to the outdoor air. This is a compressor (1)
This is because the gas refrigerant immediately after being discharged has a relatively high temperature, and a sufficient temperature difference can be secured between the gas refrigerant and the outdoor air, so that good heat exchange is performed.

Then, the refrigerant cooled by the heat-exchanging heat exchanger (8) flows into the heat storage circuit (104) from the downstream end (105b) and flows into the preheater (11). The refrigerant is cooled by the cold water flowing through the water circuit (102) in the preheater (11), and condensed into a liquid refrigerant. That is, the cold heat stored in the heat storage tank (21) is recovered. The liquid refrigerant flowing out of the preheater (11) is stored in a heat storage recovery circuit.
(108), and flows into the main refrigerant circuit (103) from the downstream end (108b). After being diverted and expanded by the indoor expansion valves (6, 6,...), The indoor heat exchangers (5, 5,...) Evaporate to cool the indoor air. After the evaporated refrigerant flows out of the indoor heat exchanger (5, 5, ...), it passes through the four-way switching valve (2) and the accumulator (7),
It is sucked into the compressor (1).

On the other hand, in the water circuit (102), the heat storage tank (2)
The cold water in 1) is sucked by the pump (20) and flows out of the heat storage tank (21). The cold water discharged from the pump (20) is supplied to the preheater (11)
In, heat exchange is performed with the refrigerant flowing through the refrigerant circuit (101) to cool the refrigerant and at the same time heat itself. The heated water, whose temperature has risen, is supplied to the mixer (23), a heat storage heat exchanger.
After passing through (9) and the supercooling canceller (24), it flows into the heat storage tank (21). This water is cooled by performing heat exchange with ice in the heat storage tank (21) to become cold water. Then, the cold water flows out of the heat storage tank (21) again, and repeats the above-described circulation operation.

As described above, the room is cooled by using the ice in the heat storage tank (21) as a cold heat source.

-Effects of Air Conditioner (100)-As described above, in the cooling operation utilizing cold storage heat, the refrigerant is
Before being cooled by cold water in the preheater (11), it is cooled in advance by outdoor air in the heat-dissipating heat exchanger (8). Therefore, when the heat exchange amount is fixed,
The amount of heat exchange in the preheater (11) is reduced. Therefore, the consumption of ice stored in the heat storage tank (21) can be reduced while maintaining the cooling capacity. That is, it is possible to reduce the amount of cold storage heat and efficiently use the cold storage.

The heat exchange between the refrigerant and the outdoor air in the cooling operation utilizing the cold storage heat is performed by the heat-radiating heat exchanger (8) which is a heat exchanger having a refrigerant path different from that of the outdoor heat exchanger (3). ing. In other words, the heat radiation circuit (10) is a circuit different from the main refrigerant circuit (103) provided with the outdoor heat exchanger (3).
The heat exchanger (8) for heat radiation provided in (5) exchanges heat between the refrigerant and the outdoor air. In other words, the preheater
The heat exchange is performed by a dedicated heat exchanger (8) for exchanging heat between the refrigerant and the outdoor air before collecting the cold heat in (11). Therefore, heat exchange without waste becomes possible,
Since the pipe length is short, the pressure loss in the heat exchanger can be reduced.

[0048]

[Embodiment 2] As shown in FIG.
In the air conditioner (200), the outdoor heat exchanger (3) and the heat radiating heat exchanger (8) are integrated.

-Configuration of the air conditioner (200)-The basic configuration of the air conditioner (200) is the same as that of the air conditioner (100) of the first embodiment. ) Will be described only. Further, the same reference numerals are given to the same parts as in the first embodiment, and the description thereof will be omitted.

In the second embodiment, the fourth solenoid valve (SV) is disposed between the second solenoid valve (SV2) and the downstream end (105b) of the heat radiation circuit (105).
4) and a bypass circuit (109) for bypassing both sides of the fourth solenoid valve (SV4).
The bypass circuit (109) is provided with a fifth solenoid valve (SV5) and a heat-radiating heat exchanger (8).

The heat-exchanging heat exchanger (8) is integrated with the outdoor heat exchanger (3) of the main refrigerant circuit (103). Specifically, the outdoor heat exchanger (3) and the heat exchanger for heat dissipation (8)
It is composed of a plate-fin tube type heat exchanger in which a plurality of heat transfer tubes penetrate a group of plates arranged at predetermined intervals. The plurality of heat transfer tubes are connected to an outdoor heat exchanger.
It is composed of a first heat transfer tube group forming a refrigerant path of (3) and a second heat transfer tube group forming a refrigerant path of the heat radiating heat exchanger (8). That is, for a single plate fin tube type heat exchanger (13), the refrigerant path is divided into two systems, one of which constitutes a part of the main refrigerant circuit (103), and the other one. It constitutes a part of the heat radiation circuit (105). Therefore, this plate fin tube heat exchanger (1
3) is configured so that two systems of refrigerants having different circulation paths respectively exchange heat with outdoor air. Behind the plate fin tube type heat exchanger (13), that is, the outdoor heat exchanger (3) and the heat radiation heat exchanger (8), these heat exchangers (3, 8)
A blower (12) for supplying air to both is installed.

-Operation of Air Conditioner (200)-The cold storage operation is performed in the same manner as in the first embodiment. Here, the cooling operation using the cold storage heat of the air conditioner (200) of the second embodiment will be described. In this operation, the refrigerant circulates as shown by a solid arrow in FIG. 6, and water circulates as shown by a dashed arrow. Specifically, circulation is performed as follows.

In the refrigerant circuit (101), the gas refrigerant discharged from the compressor (1) flows into the heat radiation circuit (105) and further flows into the bypass circuit (109). Then, in the heat-dissipating heat exchanger (8), it is cooled by the outdoor air and changes sensible heat.

Then, the refrigerant cooled by the heat-radiating heat exchanger (8) flows into the heat storage circuit (104) from the downstream end (105b), and flows into the preheater (11). The refrigerant is cooled by the cold water flowing through the water circuit (102) in the preheater (11), and condensed into a liquid refrigerant. That is, the cold heat stored in the heat storage tank (21) is recovered. The liquid refrigerant flowing out of the preheater (11) is stored in a heat storage recovery circuit.
(108), and flows into the main refrigerant circuit (103) from the downstream end (108b). Each of the indoor expansion valves (6, 6,...) Expands and evaporates in each of the indoor heat exchangers (5, 5,...) To cool the indoor air. After the evaporated refrigerant flows out of the indoor heat exchanger (5,5, ...),
After passing through the four-way switching valve (2) and the accumulator (7), the compressor
Inhaled in (1).

On the other hand, in the water circuit (102), cold water circulates in the same manner as in the first embodiment.

As described above, the ice in the heat storage tank (21) is used as a cold heat source to cool the room.

-Effects of Air Conditioner (200)-As described above, also in the air conditioner (200), before the refrigerant is cooled by the cold water in the preheater (11), the refrigerant is radiated in the heat exchanger (8) for heat radiation. It is cooled by outdoor air in advance. Therefore, the same effect as in the first embodiment can be obtained.

Furthermore, the air conditioner (200) of the second embodiment
In this example, the outdoor heat exchanger (3) and the heat radiation heat exchanger (8) are integrally configured. Therefore, the installation space for the heat exchanger for heat dissipation (8) can be reduced. Also one blower
According to (12), the outdoor heat exchanger (3) and the heat exchanger for heat dissipation (8)
Supply air to both. That is, the blower (12)
It also serves as a fan of the outdoor heat exchanger (3) and a fan of the heat exchanger for heat dissipation (8). Therefore, it is not necessary to separately provide a blower for the heat exchanger for heat dissipation (8). Therefore, the air conditioner (200) can be configured compactly and inexpensively.

-Modifications- In the air conditioner (200), in addition to the above-described cooling operation using cold storage heat, the following cooling operation using cold storage heat is also possible.

In this operation, as shown in FIG.
Condensed at different pressures. That is, the refrigerant is condensed at two different condensing temperatures, and the amount of heat input to the compressor (1b) is released to the outdoor air in the same manner as in the above-described operation for the refrigerant circulating at the lower condensing temperature. .

The refrigerant circulates as shown by solid arrows in FIG. That is, the refrigerant that has been pressurized from low pressure to high pressure by the first compressor (1a) is discharged from the first compressor (1a), passes through the four-way switching valve (2), and then passes through the outdoor heat exchanger (3). Condense. The condensed refrigerant is supplied to the first solenoid valve (SV1), outdoor expansion valve (4)
, And expanded at each indoor expansion valve (6, 6, ...), and then evaporated at each indoor heat exchanger (5, 5, ...). After that, each indoor heat exchanger
After flowing out of (5,5, ...), it is sucked into the compressor (1) through the four-way switching valve (2).

On the other hand, the refrigerant whose pressure has been raised from low pressure to intermediate pressure by the second compressor (1b) is discharged from the second compressor (1b), passes through the third solenoid valve (SV3), and then passes through the bypass circuit (109). ), And is cooled by performing sensible heat change in the heat-exchanging heat exchanger (8). The refrigerant flowing out of the heat exchanger for heat dissipation (8) is
From b), it flows into the heat storage circuit (104) and condenses in the preheater (11). The refrigerant condensed in the preheater (11) is stored in the heat storage and recovery circuit (108).
From the downstream end (108b) into the main refrigerant circuit (103) and joins with the refrigerant flowing from the outdoor heat exchanger (3). After that,
As described above, the refrigerant expands in each indoor expansion valve (6, 6, ...), evaporates in each indoor heat exchanger (5, 5, ...), and returns to the compressor (1).

In this operation, the same effect as in the above-described cooling operation utilizing cold storage heat can be obtained.

[0064]

Third Embodiment An air conditioner (30
No. 0) stores dew water generated in the water circuit (102), and cools the refrigerant immediately after discharge by the dew water.

—Configuration of Air Conditioner (300) — As shown in FIG. 9, in the third embodiment, as in the second embodiment, the heat radiation circuit (105) is provided with a bypass circuit (109). The bypass circuit (109) is provided with a fifth solenoid valve (SV5) and a heat-exchanging heat exchanger (8). The heat-dissipating heat exchanger (8) is immersed in the dew condensation water stored in the dew condensation water storage means (25).

The dew condensation water storage means (25) is arranged below the preheater (11), and is configured so that dew condensation water generated on the surface of the preheater (11) is dropped and stored. That is, the preheater (1
When cold water flows through 1), the surface of the preheater (11) is cooled,
Water vapor in the outdoor air condenses on the surface of the preheater (11). And this dew water falls, and the dew water storage means (25)
To stay in.

The heat-dissipating heat exchanger (8) is composed of a bare copper pipe, and is disposed in the dew-water storage means (25) so that the whole is immersed in the dew water. In addition, heat exchanger for heat dissipation
(8) may be provided with fins.

The other configuration is the same as that of the first embodiment, and the description is omitted.

-Operation of Air Conditioning Apparatus (300)-During the cooling operation using cold storage heat, the refrigerant circulates as shown by a solid line arrow in FIG. That is, the refrigerant discharged from the compressor (1) flows into the bypass circuit (109) of the heat radiation circuit (105), and in the heat radiation heat exchanger (8), is cooled by the condensed water and changes sensible heat. Dissipates heat input to the compressor (1). And heat exchange with cold water in the preheater (11),
It condenses to liquid refrigerant. Thereafter, in the same manner as in the second embodiment, the indoor heat exchangers (5, 5,...) Evaporate to cool the indoor air and return to the compressor (1).

The water circulation operation in the water circuit (102) is the same as in the first embodiment.

-Effect of Air Conditioner (300)-As described above, in the air conditioner (300), before the refrigerant is cooled by the chilled water in the preheater (11), the heat is radiated in the heat radiating heat exchanger (8). Pre-cooled. Therefore,
The same effect as in the first embodiment can be obtained.

Further, the air conditioner (300) of the third embodiment
In the example, the refrigerant before flowing into the preheater (11) is cooled not by the outdoor air but by dew condensation water. Therefore, since the heat exchange with the liquid having good heat transfer, the refrigerant is easily cooled,
This makes it possible to reduce the size of the heat exchanger (8) for heat radiation.

Further, it is possible to effectively use the condensed water that has been conventionally wasted. That is, the preheater
Condensation water generated on the surface of (11) is generated by consuming cold heat of cold water. Conventionally, since the dew water is simply discarded, a part of the cold storage is discharged to the outside air without being used for cooling the refrigerant. However, in the present embodiment, since the cold heat is absorbed from the dew water, a part of the loss of the cold heat storage is eventually recovered. Therefore, it becomes possible to use the cold storage heat more effectively.

According to the present embodiment, the higher the temperature of the outdoor air, the better the heat exchange in the heat radiating heat exchanger (8). That is, normally, the higher the temperature, the higher the absolute humidity of the outdoor air and the greater the amount of dew condensation generated. Therefore, the amount of dew water flowing outside the heat exchanger for heat dissipation (8) also increases, and heat exchange is improved.

A blower for the heat exchanger (8) for heat radiation
(16) becomes unnecessary.

-Modification- In the above-described Embodiment 3, as the dew water generated in the water circuit (102), the dew water generated exclusively on the surface of the preheater (11) is used. However, the dew water generated in the water circuit (102) is not limited thereto, and may be dew water generated in the heat storage heat exchanger (9), the supercooling canceller (24), and the like. That is,
The dew condensation water storage means (25) may be provided at any place where dew condensation water can be stored, such as below the heat storage heat exchanger (9) or the subcooling canceller (24). Further, the number is not limited to one, and a plurality may be provided.

[0077]

As described above, according to the present invention, the following effects are exhibited.

According to the first and second aspects of the present invention, since the refrigerant is cooled in advance by the outdoor air in the heat radiating heat exchanger, the consumption of the heat storage medium in the heat storage / recovery heat exchanger is reduced. be able to. Therefore, it is possible to efficiently use the cold storage heat. In addition, the heat-exchanging heat exchanger is provided separately from the outdoor heat exchanger for exclusively cooling the refrigerant in advance with the outdoor air, so that heat exchange can be performed without waste. Further, since the pipe length is shortened, the pressure loss in the heat exchanger can be reduced.

According to the third aspect of the present invention, since the outdoor heat exchanger and the heat radiating heat exchanger are integrated, the installation space for the heat radiating heat exchanger can be reduced, and the air conditioner can be improved. The device can be made compact.

According to the fourth aspect of the present invention, the outdoor heat exchanger and the heat radiating heat exchanger can be integrated by a specific structure. In addition, the same plate fin can be commonly used as the fins of the outdoor heat exchanger and the heat radiating heat exchanger, and both heat exchangers can be configured at low cost.

According to the fifth aspect of the present invention, it is not necessary to separately provide a blower for the heat exchanger for heat radiation, and the air conditioner can be constructed at a low cost.

According to the sixth aspect of the present invention, the refrigerant before flowing into the heat storage / recovery heat exchanger is not the outdoor air but the outdoor air.
It can be cooled by dew condensation water. Therefore, heat exchange is performed with the liquid having good heat transfer, and the refrigerant is easily cooled. Therefore, the heat exchanger for heat dissipation can be made compact. Further, since the cold heat is recovered from the condensed water that has been conventionally wasted, the cold heat can be more effectively used. Further, a blower for the heat exchanger for heat dissipation is not required.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a regenerative air conditioner.

FIG. 2 is a circuit diagram showing a circulation operation of refrigerant and water during a cold storage operation.

FIG. 3 is a circuit diagram illustrating a circulation operation of refrigerant and water during a cooling operation using cold storage heat.

FIG. 4 is a Mollier diagram.

FIG. 5 is a circuit diagram of a regenerative air conditioner.

FIG. 6 is a circuit diagram illustrating a circulation operation of refrigerant and water during a cooling operation using cold storage heat.

FIG. 7 is a Mollier diagram.

FIG. 8 is a circuit diagram showing a circulation operation of refrigerant and water during a cooling operation utilizing cold storage heat.

FIG. 9 is a circuit diagram showing a circulation operation of refrigerant and water during a cooling operation utilizing cold storage heat.

FIG. 10 is a circuit diagram of a conventional regenerative air conditioner.

[Explanation of symbols]

 (1) Compressor (3) Outdoor heat exchanger (4) First expansion valve (5) Indoor heat exchanger (6) Indoor expansion valve (8) Heat radiation heat exchanger (9) Heat storage heat exchanger (11 ) Preheater (12) Blower (20) Pump (21) Heat storage tank (101) Refrigerant circuit (102) Water circuit

Claims (6)

[Claims] 1. Compressor (1), outdoor heat exchanger (3), decompression means
(6) and a main refrigerant circuit (103) in which an indoor heat exchanger (5) is connected in order to form an annular closed circuit; and a heat storage heat exchanger (9) that generates a supercooled heat storage medium.
And a heat storage circuit (104) having a heat storage recovery heat exchanger (11) that recovers heat by exchanging heat between the refrigerant and the heat storage medium, and condenses from the main refrigerant circuit (103) during the cold storage operation. The refrigerant flows into the heat storage circuit (104), the refrigerant is evaporated in the heat storage heat exchanger (9) and returned to the compressor (1), while the cold storage utilizing cooling operation,
The refrigerant discharged from the compressor (1) is condensed by the heat storage / recovery heat exchanger (11) and returned to the main refrigerant circuit (103) from upstream of the pressure reducing means (6).
In a regenerative air conditioner that circulates refrigerant so as to evaporate in an indoor heat exchanger (5), a compressor (1) is provided upstream of the heat storage recovery heat exchanger (11).
A heat-exchanger air characterized by being provided with a heat-dissipating heat exchanger (8) for supplying heat to the heat-storing and recovering heat exchanger (11) after exchanging heat with the outdoor air for cooling the refrigerant discharged from the air. Harmony equipment. 2. The regenerative air conditioner according to claim 1, wherein the compressor (1) increases a pressure of the refrigerant from a low pressure to a high pressure.
A compressor (1a), and a second compressor (1b) for increasing the pressure of the refrigerant from the low pressure to an intermediate pressure lower than the high pressure, and discharging the refrigerant from the first compressor (1a) during cooling operation using cold storage. The condensed refrigerant is condensed in the outdoor heat exchanger (3) while the second compressor
Refrigerant discharged from (1b) is cooled by a heat-exchanger heat exchanger (8), and then circulates the refrigerant so as to be condensed by a heat-storage recovery heat exchanger (11). Harmony equipment. 3. The regenerative air conditioner according to claim 1, wherein the outdoor heat exchanger (3) comprises an air-cooled heat exchanger, and the outdoor heat exchanger (3) and the heat-exchanging heat exchanger (8). And a heat storage type air conditioner characterized by being integrated. 4. The regenerative air conditioner according to claim 3, wherein the outdoor heat exchanger (3) and the heat radiating heat exchanger (8) each include a plurality of plate fins arranged at predetermined intervals and a plurality of heat transfer tubes. A plurality of heat transfer tubes, the first heat transfer tube group forming a refrigerant path of the outdoor heat exchanger (3), and a radiating heat exchanger (8). And a second heat transfer tube group forming the refrigerant path of (1). 5. The regenerative air conditioner according to claim 3, wherein the outdoor heat exchanger (3) and the heat exchanger for heat dissipation are provided for the outdoor heat exchanger (3) and the heat exchanger for heat dissipation (8). A regenerative air conditioner comprising a blower (12) for supplying air to both of the air conditioners (8). 6. Compressor (1), outdoor heat exchanger (3), decompression means
(6) and a main refrigerant circuit (103) in which an indoor heat exchanger (5) is connected in order to form an annular closed circuit; and a heat storage heat exchanger (9) that generates a supercooled heat storage medium.
And a heat storage circuit (104) having a heat storage recovery heat exchanger (11) for recovering heat by exchanging heat between the refrigerant and the heat storage medium; and a heat storage medium conveying means (20); Container (1
1), the heat storage heat exchanger (9), a heat storage medium circuit (102) in which a heat storage tank (21) that eliminates a supercooled state of the heat storage medium and stores heat is connected in order and configured in an annular closed circuit. In the cold heat storage operation, the condensed refrigerant flows from the main refrigerant circuit (103) to the heat storage circuit (104), and the refrigerant is evaporated by the heat storage heat exchanger (9) and returned to the compressor (1). During cooling operation using cold storage,
The refrigerant discharged from the compressor (1) is condensed by the heat storage / recovery heat exchanger (11) and returned to the main refrigerant circuit (103) from upstream of the pressure reducing means (6).
In a regenerative air conditioner that circulates refrigerant so as to evaporate in an indoor heat exchanger (5), a dew condensation water storage means (25) for storing dew condensation water generated in the heat storage medium circuit (102) is provided, On the upstream side of the recovery heat exchanger (11), the compressor
The heat exchanger (8) for radiating and cooling the refrigerant discharged from (1) by exchanging heat with the condensed water, the condensed water storage means (25)
A heat storage type air conditioner, which is disposed so as to be immersed in the dew water stored in the dew water storage means (25).