JP2508240B2 - Ice heat storage device and ice heat storage type air conditioner equipped with the ice heat storage device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a heat storage type air conditioner provided with a heat storage tank for storing a heat storage medium, and more particularly to a heat storage type air conditioner housed in the heat storage tank of the heat storage apparatus. Regarding improvement of heat exchanger.

(Prior Art) Conventionally, as a means for reducing the power demand at the peak of the cooling load and expanding the power demand at the off-peak time, cold heat is stored in a heat storage medium at the off-peak time of the cooling load, and the cold heat is operated at the peak. Development of a heat storage type air conditioner designed to contribute to

An example of this heat storage type air conditioner is the device disclosed in Japanese Utility Model Laid-Open No. Sho 55-94661. What is disclosed in the publication is that a heat storage tank having a heat storage heat exchanger and a cold heat extraction heat exchanger is provided between an indoor heat exchanger and an outdoor heat exchanger, and one side of the heat storage heat exchanger is provided. To the outdoor heat exchanger via the pressure reducing mechanism and the switching valve,
Connected to the compressor on the other side, one side of the heat exchanger for cold heat extraction is connected to the outdoor heat exchanger via the switching valve, and the other side is connected to the indoor heat exchanger via the pressure reducing mechanism. By appropriately switching the switching valve, during heat storage operation, the refrigerant flows in the order of the compressor, the outdoor heat exchanger, the pressure reducing mechanism, and the heat storage heat exchanger, and the refrigerant flows in the cooling pipe of the heat storage heat exchanger. Evaporate to cause heat exchange between the refrigerant and water stored in the heat storage tank to cool the water into ice,
The ice is attached and generated on the surface of the cooling pipe to store cold heat in the heat storage tank. On the other hand, during the heat storage recovery cooling operation, the compressor,
Refrigerant is caused to flow in the order of the outdoor heat exchanger, the heat exchanger for extracting cold heat, the pressure reducing mechanism, and the indoor heat exchanger, and heat is exchanged between the ice adhering to the cooling pipe and the refrigerant in the heat storage tank to melt the ice. The refrigerant is cooled by cooling the refrigerant, and the cold heat is taken out into the refrigerant pipe and supplied to the indoor heat exchanger to contribute the cold heat to the cooling.

(Problems to be solved by the invention) However, in the conventional heat storage type air conditioner as described above, the pipe direction of the hairpin type cooling pipe of the heat exchanger for heat storage is the horizontal direction, and Since ice is attached to the cooling pipe in the direction to store cold heat, there are problems as described below.

(I) As indicated by the arrow in FIG. 7, ice (I) is melted by convection of water (W) in the heat storage tank (b).
On the side surface, the melting is promoted, but on the upper and lower surfaces, there is a large amount of residual ice, so when ice making and melting are repeated, the ice may fuse in the vertical direction, and the heat storage efficiency deteriorates.

(Ii) When the amount of ice making is large and the respective ices (I) are in a fused state as shown in FIG. 8 (a), only the surface of the fused ice blocks is melted by the circulation flow ( As shown in FIG. 8 (b), the melting efficiency is low, and the original function of the heat storage device is hindered.

Further, when the heat storage and heat recovery are performed by one heat storage heat exchanger, there are the following problems.

(I) As shown in FIG. 9 (a), when the ice (I) adhering to the surface of the cooling pipe (a) is melted during heat storage recovery, the ice (I) is cooled by the cooling pipe (a). It will melt from the contact part, that is, from the inside. At this time, since the ice (I) is kept in a horizontal state, the water (W) in the melted portion has a high temperature and is located in the upper part, which is higher in the upper part than in the lower part of the cooling pipe (a). Melting is promoted, and as shown in FIG. 9 (b), the ice (I) above the cooling pipe (a) becomes thin in the cross section of the ice (I) around the cooling pipe (a). . After that, when ice making (heat storage operation) is performed again, FIG. 9 (c)
As shown in (3), the deposited thickness of ice (I) was non-uniform and the heat storage efficiency was poor.

(Ii) Since the ice attached to the cooling pipe is always kept in a state of surrounding the cooling pipe, as shown in FIG. 10, when only a part of the ice is melted, the buoyancy of ice (I) ( The arrow A) is applied as a load to the cooling pipe (a), which leads to deformation of the cooling pipe (a).

(Iii) When ice making and thawing are repeated so that the remaining ice remains at the same place without moving, the old unmelted ice (I) shown in FIG. 10 is not updated, Moreover, since the defrosting of that part is also bad, the residual water amount increases, and the local blocking phenomenon easily occurs.

As described above, in the conventional heat storage device, the heat storage and melting efficiency are poor, and when the melting and re-ice making are repeated, the respective ices are fused (blocking) and the cooling pipe or the heat storage tank is deformed,
It led to damage.

Therefore, an object of the present invention is to obtain a heat storage device of a heat storage type air conditioner in which a cooling pipe of a heat storage heat exchanger is arranged in a vertical direction in a heat storage tank so as to uniformly melt ice. .

(Means for Solving the Problems) Next, the means taken by the present invention to achieve the above object will be described.

First, the invention according to claim (1) is based on FIG.
As shown in the figure, the heat storage tank (9), the heat storage medium (W) for ice making stored in the heat storage tank (9), and the heat storage medium (W) During icing operation,
The cooling refrigerant supplied from the cold inside supply means (1) circulates, heat is exchanged between the cooling refrigerant and the heat storage medium (W) to ice the heat storage medium (W), and the ice ( While I) is attached to the outer peripheral surface, during the cold heat recovery operation of melting ice, the melting refrigerant supplied from the refrigerant supply means (1) flows,
A heat storage heat exchanger (10) having a heat transfer tube (10a) for melting ice (I) from the inside while performing heat exchange between the melting refrigerant and ice (I) to give cold heat to the melting refrigerant. And the heat transfer pipe (10a) of the heat storage heat exchanger (10) is formed to meander vertically in the heat storage tank (9).

The invention according to claim (2) is, in the ice heat storage device according to claim (1), as shown in FIG. 6, a heat storage heat exchanger (10) is provided with a plurality of heat transfer tubes (10a). The heat transfer tube (10a) is arranged such that the cross section of the heat transfer tube (10a) is located in a straight line in the vertical and horizontal directions in a horizontal sectional view of the heat storage tank (9).

The invention according to claim (3) is, as shown in FIG. 1, a compressor (2), a first heat exchanger (3) on the heat source side, a first pressure reducing mechanism (4) for depressurizing the refrigerant, and a load side. The second heat exchanger (5) of the main refrigerant circuit (1) is connected by the refrigerant pipe (6).
And an ice heat storage type air conditioner including an ice heat storage device provided with a heat storage medium (W) capable of storing heat. Then, while the second pressure reducing mechanism (12) for reducing the pressure of the refrigerant during the ice heat storage operation is provided in the refrigerant pipe (6), the ice heat storage device has a heat storage medium (W) for ice making in the heat storage tank (9). ) Is stored and a heat storage heat exchanger (10) immersed in the heat storage medium (W) is provided. Further, the heat storage heat exchanger (10) is connected to the main refrigerant circuit (1) in parallel with the second pressure reducing mechanism (12), and a heat transfer tube (10a) through which the refrigerant passes is provided, and the heat transfer tube is provided. (10a) is formed so as to meander vertically in the heat storage tank (9). Furthermore,
The first heat exchanger side end portion (10) of the heat storage heat exchanger (10)
One end of the short-circuit pipe (13) is connected to b), and the other end of the short-circuit pipe (13) is connected to the refrigerant pipe (6) upstream of the compressor (2). Then, during the ice heat storage operation, by causing the refrigerant to flow from the second pressure reducing mechanism (12) to the heat storage heat exchanger (10) from the second heat exchanger side end portion (10c), the heat storage tank (9) stores heat. The heat transfer tube (10) of the heat exchanger (10) for heat storage by cooling the medium (W)
Ice is attached to the outer peripheral surface of a), and then the short-circuit tube (1
While flowing through the compressor (12) to the upstream side of the compressor (12), the refrigerant is transferred from the first heat exchanger (3) to the heat storage heat exchanger (10) at the end of the first heat exchanger during ice melting and cooling operation. A circuit switching means (15) is provided for switching the circuit connection so as to supply the second heat exchanger (5) with the cooling by cooling the melting while melting the ice from the inside by flowing from the section (10b). It has a structure.

(Operation) Next, the operation of the present invention having the above configuration will be described.

In the invention according to claim (1), during the icing operation of the heat storage medium, the cooling refrigerant is supplied from the refrigerant supply means (1) to the heat transfer pipe (10a) of the heat storage heat exchanger (10) to store heat. The heat storage medium (W) in the tank (9) is cooled by exchanging heat with the refrigerant. By this cooling, the heat storage medium (W) adheres to the outer peripheral surface of the heat transfer tube (10a) as ice (I) to store cold heat. On the other hand, during the cold heat recovery operation, the heat transfer tube (10
The ice (I) adhering and generated due to the meandering of a) in the vertical direction is uniformly melted and emits cold heat.

In the invention according to claim (2), the cooling pipe (10a)
In the horizontal sectional view of the heat storage tank (9), the cross sections of the cooling pipes are located on the straight lines in the vertical and horizontal directions, respectively, so that even if the ice pieces are fused with each other, a portion that is not frozen is likely to occur in the vertical direction. Therefore, the partial heat storage medium (W) is circulated to promote melting.

In the invention according to claim (3), during the ice heat storage operation, the circuit connection is switched by the circuit switching means (15) and the opening degree of the second pressure reducing mechanism (12) is controlled so that the arrow in FIG. As shown, the refrigerant that has passed through the compressor (2) and the first heat exchanger (3) is decompressed by the second decompression mechanism (12), and then the first heat exchanger side end portion (10b) is used for heat storage heat exchange. Bowl (10)
Supply in. The refrigerant supplied into the heat storage heat exchanger (10) cools the heat storage medium (W) in the heat storage tank (9) by evaporating in the heat storage heat exchanger (10), Ice (I) is adhered and generated on the surface of the heat exchanger (10) for storage, and cold heat is stored in the heat storage tank.

Further, during the ice-melting / cooling operation, the circuit connection is switched by the circuit switching means (15), and the opening degrees of the first and second pressure reducing mechanisms (4) and (12) are controlled, as shown by arrows in FIG. The refrigerant that has passed through the compressor (2) and the first heat exchanger (3) is transferred from the first heat exchanger side end portion (10a) to the heat storage heat exchanger (10) by the second pressure reducing mechanism (12). Controls the flow rate of the supplied refrigerant. The refrigerant supplied to the heat storage heat exchanger (10) is ice (I) stored in the heat storage tank (9).
And is guided to the first pressure reducing mechanism (4) from the second heat exchanger side end portion (10c), introduced from the first pressure reducing mechanism (4) to the second heat exchanger (5), and Evaporation in the second heat exchanger (5) contributes to indoor cooling.

(Example) Next, the Example of this invention is described along drawing.

FIG. 1 shows the overall configuration of the air conditioner according to this example,
(2) is a compressor, (3) is an outdoor heat exchanger as a heat source side heat exchanger for condensing the discharge gas from the compressor (2),
(4) is a first electronic expansion valve for decompressing the refrigerant condensed in the outdoor heat exchanger (3), and (5) is an indoor heat exchanger as a load side heat exchanger for evaporating the refrigerant. The above devices (2) to (5) are sequentially connected by a refrigerant pipe (6) so that the refrigerant can flow, and the heat obtained by heat exchange with indoor air in the indoor heat exchanger (5) is an outdoor heat exchanger. In (3), the main refrigerant circuit (1) having a heat pump function of discharging to the outside air is configured.

And, as an accessory to this main refrigerant circuit (1),
A receiver (7) for temporarily storing the refrigerant is provided downstream of the outdoor heat exchanger (3), and a liquid refrigerant in the intake gas to the compressor (2) is provided upstream of the compressor (2). An accumulator (8) for separating is provided respectively. Further, the thermistors (Th1) and (Th2) are provided on the upstream side of the first electronic expansion valve (4) and the upstream side of the accumulator (8), respectively.
Are arranged to detect the temperature in each refrigerant pipe (6), while a pressure sensor (Ps) is arranged on the upstream side of the accumulator (8) and the refrigerant pipe on the upstream side of the compressor (2). The pressure in (6) is detected, and the opening of the expansion valve and the capacity of the compressor (2) by inverter control are controlled by the refrigerant temperature and refrigerant pressure.

The air conditioner is provided with a heat storage tank (9) that stores water (W) as a heat storage medium capable of storing heat. Inside the heat storage tank (9), a refrigerant and water (W) are stored. ), A heat storage exchanger (10) for exchanging heat with The heat exchanger (10) is composed of a plurality of heat transfer tubes (10a), the heat transfer tubes (10a) are branched and connected from the main refrigerant circuit (1), and one end of the heat exchanger is connected to the receiver (7). The outdoor side connecting end (10b) is connected to the downstream side, and the other end is the indoor side connecting end (10c) connected to the upstream side of the first electronic expansion valve (4). That is, the outdoor side connecting end (10b) is arranged closer to the outdoor heat exchanger (3) than the indoor side connecting end (10c). Further, the refrigerant pipe (6) between both connecting ends (10b) and (10c) of the heat storage heat exchanger (10).
A second electronic expansion valve (12) for reducing the pressure of the refrigerant during the ice heat storage operation is provided therein. That is, the heat transfer tube (10a) is arranged in parallel with the second electronic expansion valve (12).

The feature of the present invention lies in the heat transfer tube (10a) arrangement structure of the heat storage heat exchanger (10). This heat transfer tube (10a) is arranged so as to meander vertically in the heat storage tank (9), that is, as shown in FIG. 2, it is immersed in water (W) in the heat storage tank (9). , A straight line portion (10e) close to the U-shaped portion (10d) that is the end in the vertical direction
Are supported by a support base (9a) provided upright in the heat storage tank (9) and arranged vertically. Further, as shown in FIG. 6, each heat transfer tube (10a) is arranged so as to be located on a straight line in the vertical and horizontal directions in a horizontal sectional view of the heat storage tank (9).

Further, a short-circuit pipe (13) is connected between the outdoor side connection end (10b) of the heat storage heat exchanger (10) and the upstream side of the compressor (2) to connect them.

Further, this device is provided with circuit switching means (15) for switching the circuit connection according to each operating state. The circuit switching means (15) comprises a first opening / closing valve (11), a second opening / closing valve (14) and an opening / closing control means (16), and the first opening / closing valve (11) is a heat storage heat exchanger (10). 2) is provided between the outdoor side connection end (10b) and the connection position of the short-circuit pipe (13), and the second on-off valve (14) is provided in the short-circuit pipe (13). Further, the opening / closing control means (16) controls the operating state of the device, each thermistor (Th1), (Th2), and the pressure sensor (P
In response to the signal from (s), the first on-off valve (1
1) is closed, the second on-off valve (14) is opened, the first electronic expansion valve (4) is fully closed, and the opening degree of the second electronic expansion valve (12) is the thermistor (Th1 ) And pressure sensor (P
s) on the basis of the detection signal, the first opening / closing valve (11) is opened and the second opening / closing valve (14) is closed during heat storage recovery cooling operation, and The openings of the first electronic expansion valve (4) and the second electronic expansion valve (12) are controlled based on the detection signals of the thermistor (Th2) and the pressure sensor (Ps).

Next, each operating state of the circuit configured as described above will be described.

First, during normal cooling operation without heat storage recovery,
The second on-off valves (11) and (14) are closed, and the second electronic expansion valve (12) is fully opened. In this state, the refrigerant compressed by the compressor (2) is condensed by the outdoor heat exchanger (3), decompressed by the first electronic expansion valve (4), and supplied to the indoor heat exchanger (5). After being evaporated in the indoor heat exchanger (5) to take away ambient heat and contribute to cooling, it is again circulated and circulated to the compressor (2) side.

In addition, during the ice heat storage operation, the opening / closing control means (16) of the circuit switching means (15) operates, so that the first opening / closing valve (1
1) is closed, the second on-off valve (14) is opened, the first electronic expansion valve (4) is fully closed, and the opening degree of the second electronic expansion valve (12) is the thermistor (Th1). And pressure sensor (Ps)
The opening and closing control means (16) appropriately controls the opening and closing control means (16) on the basis of the detection signal to detect the refrigerant passing through the compressor (2) and the outdoor heat exchanger (3) as shown by the arrow in FIG. After decompressing with (12), heat transfer pipe (10
a) Supply within. The refrigerant supplied into the heat transfer tube (10a) evaporates in the heat transfer tube (10a) and exchanges heat with the water (W) in the heat storage tank (9), and the heat transfer tube (10a). Ice (I) adheres to the surface of the to generate cold energy.

When the heat storage recovery cooling operation is performed after this ice heat storage operation, the first opening / closing valve (11) is operated by the operation of the opening / closing control means (16).
Is opened, the second on-off valve (14) is closed, and the first
Based on the detection signals of the thermistor (Th2) and the pressure sensor (Ps), the opening and closing control means (1) of the electronic expansion valve (4) is opened.
6) controls the flow rate of the refrigerant flowing through the compressor (2) and the outdoor heat exchanger (3) through the main refrigerant circuit (1) as shown by the arrow in FIG. 3 to the second electronic expansion valve. (12) to control the flow rate of the refrigerant supplied from the outdoor side connection end (10b) to the heat transfer tube (10a). And the heat transfer tube (10
The refrigerant supplied to a) is cooled by heat exchange with the ice (I) stored in the heat storage tank (9), and the first electronic expansion valve (4) from the indoor side connection end (10c). Led to the first
After the opening of the electronic expansion valve (4) is controlled to reduce the pressure,
When introduced into the indoor heat exchanger (5) and evaporated in the indoor heat exchanger (5), it contributes to cooling the room.

In such heat storage recovery cooling operation, the heat transfer tube (10
Fig. 4 (a) because a) is arranged vertically.
Ice (I) attached to the heat transfer tube (10a) as shown in
As shown in FIG. 4 (b), the heat transfer tube (10a) is uniformly melted on a concentric circle. Therefore, a predetermined amount of ice (I) is melted along the heat transfer tube (10a) into a heat storage tank. It does not float on the heat transfer tube (10a) and does not act on the heat transfer tube (10a), and deformation of the heat transfer tube (10a) is prevented. Also,
Floating ice (I) is exposed to relatively high temperature water (W), so melting is promoted and old water (W) does not always remain in one place, preventing abnormal growth of ice (I). Therefore, even with the set amount of ice making with a high ice filling rate, local blocking is less likely to occur than in the past, and damage to the heat transfer tube (10a) and the heat storage tank (9) due to the blocking is suppressed. Furthermore,
At the time of re-ice making, as shown in FIG. 4 (c), the portion melted during the cold heat recovery operation becomes iced again, and the reproducibility is excellent.

Further, as described above, since the heat transfer tubes (10a) are arranged so as to be located on the straight lines in the vertical and horizontal directions in the horizontal sectional view of the heat storage tank (9), as shown in FIG. 6 (a). In addition, even if the amount of ice making during the ice heat storage operation is large and the ice (I) is in a fused state, the water (W) between the ice (I) can flow, so the heat storage recovery cooling During the operation, the fusion is performed so as to eliminate this fusion (see FIG. 9 (b)), the area in which water (W) flows is increased compared to the conventional one, and the fusion efficiency can be improved.

In the above, water (W) was used alone as the heat storage medium stored in the heat storage tank (9), but an aqueous brine solution containing ethylene glycol or the like may be used. Further, as shown in FIG. 5 (a), the upper end fixing portion of the heat transfer tube (10a) may be projected above the water surface, as shown in FIG. ), The U-shaped part (10d) at the lower end of the heat transfer tube (10a) is stored in the heat storage tank (9).
When the ice (I) is melted, the factors that hinder the floating of the ice (I) will be removed by projecting the ice (I) to the outside.
The floating operation of ice (I) can be easily obtained.

Although the above-described embodiment uses the direct expansion heat exchanger as the heat storage heat exchanger, it can be applied to an apparatus for making ice using a secondary refrigerant such as brine.

(Effect of the Invention) As described above, the present invention has the following effects.

In the invention according to claim (1), since the heat transfer tubes of the heat storage heat exchanger are arranged in the vertical direction, the attached ice stays substantially uniformly during the cold heat recovery operation, so that the melting is uniform. In addition, the ice does not grow locally during ice making, the ice blocking is suppressed, the heat storage efficiency is improved, and the heat storage heat exchanger and the heat storage tank are prevented from being deformed or damaged. It

In the invention according to claim (2), since the heat transfer tubes are positioned on the straight lines in the vertical and horizontal directions in the horizontal sectional view of the heat storage tank, even if the ice comrades are fused with each other, icing occurs between them. Since there is a portion that does not exist, convection of the heat storage medium to that portion promotes melting and improves melting efficiency.

In the invention according to claim (3), the ice melted by a predetermined amount is floated along the heat transfer tube and melted in the upper layer portion of the heat storage tank, so that old water remains inside the ice. It is possible to prevent local blocking.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is a circuit diagram of this device showing a heat storage operation state, FIG. 2 is a longitudinal sectional view of a heat storage tank, and FIG. 3 is a heat storage recovery cooling operation. The state corresponding to FIG. 1, FIG. 4 is a cross-sectional view of the heat transfer tube showing the adhesion state of ice, FIG. 5 is a view corresponding to FIG. 2 showing a modified example of the heat transfer tube, and FIG. 6 is heat storage recovery cooling. It is a cross-sectional view of the heat storage tank during operation. Fig. 7 ~
FIG. 10 shows a conventional example, FIG. 7 is a longitudinal sectional view of a heat storage tank of a type that melts ice by convection in the heat storage tank, and FIG. 8 is a view showing a melting state when the ice blocks, 9
The figure is a cross-sectional view of a heat transfer tube of a type in which ice is melted by a refrigerant in the heat transfer tube, and FIG. 10 is a view corresponding to FIG. 9 for explaining buoyancy acting on ice. (1) ...... Main refrigerant circuit (refrigerant supply means) (2) ...... Compressor (3) ...... Outdoor heat exchanger (first heat exchanger) (4) ...... First electronic expansion valve (first decompression) Mechanism) (5) …… Indoor heat exchanger (second heat exchanger) (6) …… Refrigerant piping (9) …… Heat storage tank (10) …… Heat storage heat exchanger (10a) …… Heat transfer tube ( 10b) …… Outdoor side connection (first heat exchanger side end) (10c) …… Indoor side connection (second heat exchanger side end) (12) …… Second electronic expansion valve (second) (Decompression mechanism) (13) …… Short-circuit tube (15) …… Circuit switching means (W) …… Water (heat storage medium)

Claims (3)

(57) [Claims] 1. A heat storage tank (9) and a heat storage medium (W) for ice making stored in the heat storage tank (9).
And, when the heat storage medium (W) is immersed in the heat storage medium (W), the cooling refrigerant supplied from the refrigerant supply means (1) flows through the cooling medium and the heat storage medium (W). While the heat storage medium (W) is iced to adhere the ice (I) to the outer peripheral surface of the heat storage medium (W), it is supplied from the refrigerant supply means (1) during the cold heat recovery operation for melting the ice. And a heat transfer tube (10a) for melting the ice (I) from the inside while giving a cold heat to the melting refrigerant by performing heat exchange between the melting refrigerant and the ice (I). And a heat transfer pipe (10) for the heat storage heat exchanger (10).
(a) is an ice heat storage device which is formed so as to meander vertically in a heat storage tank (9). 2. The ice heat storage device according to claim 1, wherein the heat storage heat exchanger (10) includes a plurality of heat transfer tubes (10a), and the heat transfer tubes (10a) are heat storage tanks (9). The heat storage device (10a) is arranged such that the cross sections of the heat transfer tubes (10a) are located in a straight line in the vertical and horizontal directions, respectively. 3. A compressor (2), a first heat exchanger (3) on the heat source side, a first pressure reducing mechanism (4) for reducing the pressure of the refrigerant, and a second heat exchanger (5) on the load side are refrigerant pipes ( In an ice heat storage type air conditioner in which the main refrigerant circuit (1) is connected by 5) and an ice heat storage device equipped with a heat storage medium (W) capable of storing heat is arranged, A second pressure reducing mechanism (12) for reducing the pressure of the refrigerant is provided in the refrigerant pipe (6), while the ice heat storage device stores a heat storage medium (W) for ice making in a heat storage tank (9). A heat storage heat exchanger (10) immersed in the heat storage medium (W) is also provided, and the heat storage heat exchanger (10) is arranged in parallel with the second pressure reducing mechanism (12) in the main refrigerant circuit. The heat transfer tube (10a) is connected to (1) and through which the refrigerant passes, and the heat transfer tube (10a) meanders vertically in the heat storage tank (9). On the other hand, one end of the short-circuit pipe (13) is connected to the first heat exchanger side end portion (10b) of the heat storage heat exchanger (10), and the other end of the short-circuit pipe (13) is formed. Is connected to the refrigerant pipe (6) on the upstream side of the compressor (2), and during the ice heat storage operation, the second heat exchanger (10) transfers the refrigerant from the second pressure reducing mechanism (12) to the heat storage heat exchanger (10). Side edge (10c)
Heat storage medium (W) in the heat storage tank (9) by flowing from
Is cooled to cause ice to adhere to and generate on the outer peripheral surface of the heat transfer pipe (10a) of the heat storage heat exchanger (10), and then to flow through the short-circuit pipe (13) to the upstream side of the compressor (2), During the ice-melting cooling operation, the refrigerant is flowed from the first heat exchanger (3) to the heat storage heat exchanger (10) from the first heat exchanger side end portion (10b) to melt the ice from the inside. An ice heat storage system equipped with an ice heat storage device, characterized in that it is provided with circuit switching means (15) for cooling and then switching the circuit connection so as to supply the refrigerant to the second heat exchanger (5). Air conditioner.