JP2000055516A - Ice heat storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ice heat storage device capable of removing ice in short time as a result of improving a heat exchanging efficiency by performing a heat exchanging operation under latent heat. SOLUTION: An ice heat storage device comprises a compressor 1 for compressing a refrigerant, a condensing/evaporating heat exchanger 3 for condensing and liquefying the refrigerant compressed upon making ice and evaporating the condensed and liquefied refrigerant upon removing ice, an ice making/ removing heat exchanger 22 having an ice making plate for making ice by absorbing the heat of the condensed and liquefied refrigerant and removing ice under the heat radiated when the refrigerant is condensed and liquefied, a selector valve 2 connected to the heat exchangers 3 and 22 and the compressor 1 to switch the passages of the refrigerant and a throttle device 4 provided between the two heat exchangers 3 and 22 to reduce the pressure of the condensed and liquefied refrigerant. The ice making/removing heat exchanger 22 is provided with an ice removing heat exchanger 23 for introducing the refrigerant compressed by the compressor 1, heating the ice and removing the ice.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage device capable of deicing in a short time by efficiently performing heat exchange.

[0002]

2. Description of the Related Art FIG. 5 is a circuit diagram showing a refrigerant circuit of a conventional dynamic ice heat storage device. In the drawing, reference numeral 1 denotes a compressor for compressing refrigerant, 2 denotes a four-way valve (switching valve), and 3 denotes an outdoor side. A heat exchanger (condensing / evaporating heat exchanger), 4 a throttle device for decompressing the condensed and liquefied refrigerant, 5 an ice making / deicing heat exchanger,
6 to 8 are refrigerant pipes, 9 is a water pump for supplying water, and 10 is a spray pipe for spraying the water supplied by the pump 9.

[0003] The ice making / deicing heat exchanger 5 is shown in Figs.
As shown in FIG. 1, the tube 12 is arranged in a meandering state and serves as a passage for a refrigerant, and an ice making plate 13 is arranged on both sides of the tube 12 so as to make ice of the sprayed water. The compressor 1 to the ice making / deicing heat exchanger 5 are connected by refrigerant pipes 6 to 8 to constitute an ice making refrigeration cycle.

[0004] The ice making operation of the dynamic ice heat storage device will be described. As shown by solid arrows in FIG. 5, the high-temperature and high-pressure refrigerant compressed by the compressor 1 flows into the outdoor heat exchanger 3 through the four-way valve 2 and the refrigerant pipe 6, where it is condensed and liquefied. The condensed and liquefied refrigerant is depressurized by the expansion device 4 to be in a low-pressure two-phase (gas phase and liquid phase) state, and flows into the ice making / deicing heat exchanger 5.

The ice making / de-icing heat exchanger 5 functions as an evaporating heat exchanger for evaporating the low-pressure two-phase refrigerant, so that the refrigerant flowing into the tube 12 and the water pump 9
The heat is exchanged with water sprayed on the surface of the ice making plate 13 by the spraying pipe 10 through the water, and the water is cooled to below the freezing point to make ice 14 on the ice making plate 13. On the other hand, the refrigerant evaporated (vaporized) by heat absorption in the tube 12 of the ice making / deicing heat exchanger 5 returns to the compressor 1 through the four-way valve 2.

[0006] Next, the deicing operation of this dynamic ice heat storage device is performed after a lapse of a predetermined time from the start of the ice making operation, as indicated by a white arrow in FIG. Flows through the four-way valve 2 and the refrigerant pipe 8 into the ice making / deicing heat exchanger 5 to be condensed and liquefied.

The ice making / deicing heat exchanger 5 functions as a condensing and liquefying heat exchanger for condensing and liquefying the refrigerant, so that the refrigerant in the tube 12 and the ice 14 frozen on the surface of the ice making plate 13 are formed. The ice 14 is heated by heat generated when the refrigerant is condensed and liquefied, deiced from the surface of the ice making plate 13, and stored in a heat storage tank (not shown). on the other hand,
The refrigerant condensed and liquefied in the tube 12 of the ice making / deicing heat exchanger 5 is reduced in pressure in the expansion device 4 to be in a low-pressure two-phase state, flows into the outdoor heat exchanger 3, and evaporates.
The flow returns to the compressor 1 via the four-way valve 2.

In this dynamic ice heat storage device, as shown in FIGS. 6 and 7, a portion 13a of the ice making plate 13 in the ice making / deicing heat exchanger 5 which is close to the tube 12 is provided.
In this case, since heat exchange is performed between the refrigerant and water on the ice making plate 13, ice layers are stacked with time to form thick ice. On the other hand, in the portion 13 b of the ice making plate 13 located between the tubes 12, 12, heat exchange between the refrigerant and the water on the ice making plate 13 is difficult to be performed. Thin ice is formed in this portion 13b.

Thus, the ice 1 made on the ice making plate 13
4 is that a thick ice is formed in a portion 13a close to the tube 12 and a thin ice is formed in a portion 13b between the tubes 12, 12, so that the thickness of the ice 14 is increased along the arrangement direction of the tubes 12. It will change periodically.

[0010] A heat storage device having a configuration different from the dynamic ice heat storage device has also been proposed (Japanese Utility Model Application Laid-Open No. 1-16).
No. 0238). This heat storage device includes a cooler capable of reverse cycle operation, a water tank for heat storage, and a heat exchanger for ice making that receives cold and warm heat alternately from the cooler via a heat transfer medium, A radiator for ice separation is provided in parallel with a passage on the heat supply side to the ice making heat exchanger. In this heat storage device, ice is made by supplying cold heat only to the ice making heat exchanger at the time of ice making, and warming is supplied to the ice making heat exchanger via the ice making radiator at the time of ice removal. Melt the ice-attached surface on the upper surface and separate it.

[0011]

In the above-mentioned conventional dynamic ice heat storage device, the ice 14 produced in the ice making / deicing heat exchanger 5 is generated when the high-temperature and high-pressure refrigerant is condensed and liquefied. The ice is defrosted from the surface of the ice making plate 13 by being heated by the heat. At this time, in the portion 13a of the ice making plate 13 which is close to the tube 12, the heat exchange amount is large and the deicing is performed promptly.
Since the heat exchange amount is small and the deicing speed is very low in the portion 13b located between
No. 4 could not easily be deiced, and there was a problem that ice hardly fell into the heat storage tank and the deicing efficiency was reduced.

In the above-described heat storage device, a radiator for ice separation is provided separately from the heat exchanger for ice making, and the refrigerant flows from the ice radiator to the heat exchanger for ice making at the time of ice separation. However, in the heat exchanger for ice making, which originally requires the most heat, there is a problem that the refrigerant is liquefied, so that heat is exchanged with sensible heat, and the heat exchange rate is extremely poor. Was.

The present invention has been made in view of the above circumstances, and it is possible to improve the heat exchange rate by performing heat exchange with latent heat, and as a result, to perform deicing in a short time. It is an object of the present invention to provide an ice thermal storage device capable of performing the above-mentioned.

[0014]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides the following ice heat storage device. That is, an ice heat storage device according to claim 1 includes a compressor that compresses a refrigerant, and a condensing / evaporating heat exchanger that condenses and liquefies the compressed refrigerant during ice making and evaporates the condensed and liquefied refrigerant during deicing. An ice making / deicing heat exchanger having an ice making plate for making ice by absorbing heat of the condensed and liquefied refrigerant and performing deicing by radiating heat when the refrigerant is condensed and liquefied; A switching valve connected to switch the flow path of the refrigerant,
An ice heat storage device provided between the two heat exchangers and configured to reduce the pressure of the condensed and liquefied refrigerant, wherein the switching valve is switched to selectively execute an ice making cycle and a deicing cycle. The ice heat exchanger is characterized by being provided with a deicing heat exchanger for introducing the refrigerant compressed by the compressor to heat the ice made and deicing the ice.

According to a second aspect of the present invention, there is provided an ice heat storage device, comprising: a compressor for compressing a refrigerant; An ice-making / de-icing heat exchanger having an ice-making plate, making ice by absorbing heat of the condensed and liquefied refrigerant, and performing de-icing by releasing heat when the refrigerant is condensed and liquefied; these heat exchangers; A switching valve connected to the compressor to switch the flow path of the refrigerant; and a throttle device provided between the two heat exchangers to reduce the pressure of the condensed and liquefied refrigerant. An ice heat storage device for selectively performing a deicing cycle is characterized in that the ice making / deicing heat exchanger is provided with heating means for heating the ice made and deicing.

In the ice heat storage device according to the first aspect of the present invention,
The deicing heat exchanger for introducing the refrigerant compressed by the compressor and heating and deicing the ice produced by introducing the refrigerant compressed by the compressor into the ice making / deicing heat exchanger, ice making/
By sequentially performing a reverse cycle de-icing operation for heating the de-ice heat exchanger and a forward cycle de-ice operation for heating the de-ice heat exchanger, the ice making / de-ice heat exchanger and the de-ice The entire ice making plate is heated by the latent heat of condensation of both heat exchangers, and the whole ice made on the ice making plate is de-iced in a short time, so that ice for heat storage can be efficiently made in a short time. .

Further, in the ice heat storage device according to the present invention, the ice making / deicing heat exchanger is provided with a heating means for heating the ice made and deicing the ice, so that the ice making can be performed during deicing. By performing a reverse cycle deicing operation of heating the heat exchanger for deicing / deicing and heating by the heating means, the latent heat of condensation of the heat exchanger for ice making / deicing and the heating of the heating means heat the entire ice making plate. The whole ice that has been heated and made on the ice making plate is deiced in a short time, and ice for heat storage can be efficiently made in a short time.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the ice heat storage device of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a refrigerant circuit of a dynamic ice heat storage device according to a first embodiment of the present invention, and FIG.
FIG. 2 is a sectional view taken along line BB in FIG.
A heat exchanger 1 includes an ice making / de-icing heat exchanger 22 for performing ice making (forward cycle) and de-icing (reverse cycle) and a de-ice heat exchanger 23 for performing de-ice (forward cycle). Is done. 24 is a check valve provided on the ice making / de-icing heat exchanger 22, 25 is a check valve provided on the de-icing heat exchanger 23, 26 is an electromagnetic two-way valve, and 27 and 28 are refrigerants. Piping.

A tube 31 serving as a refrigerant passage of the ice making / deicing heat exchanger 22 is arranged in a meandering state, and a tube 32 serving as a refrigerant passage of the deicing heat exchanger 23 is provided between the tubes 31. The tube 3 in a meandering state in the vertical direction
1 are arranged close to each other.

The tubes 31 and 32 are connected by refrigerant pipes 6 to 8 via check valves 24 and 25 during ice making (forward cycle) and deicing (reverse cycle), respectively. At the time of the (forward cycle), the refrigerant is connected to the refrigerant pipes 27, 28, and 8 via the electromagnetic two-way valve 26 and the check valve 24, thereby forming a refrigeration cycle for ice making and a water pump 9
Making / deicing heat exchanger 2 by means of a spray pipe 10
Water is scattered and supplied to the ice making plate 13 in the inside 2 to make ice. The produced ice is defrosted by heating by making the ice making / deicing heat exchanger 22 and the deicing heat exchanger 23 function as condensers, and is stored as ice in a heat storage tank (not shown).

Next, a refrigeration cycle of the dynamic ice heat storage device will be described. During ice making operation,
As shown by the thin solid arrows in FIG. 1, the gaseous high-temperature, high-pressure refrigerant compressed by the compressor 1 passes through the four-way valve 2, is condensed and liquefied by the outdoor heat exchanger 3, and decompressed by the expansion device 5. Then, it enters a low-pressure two-phase state and flows into the ice making / deicing heat exchanger 22.

The low-pressure two-phase refrigerant that has flowed into the tube 31 of the ice making / de-icing heat exchanger 22 evaporates here, and from the water sprinkling pipe 10 through the water pipe 9, the ice making / de-icing heat exchanger. Heat exchange is performed with the water sprayed on the ice making plate 13 to make ice on the ice making plate 13. The refrigerant evaporated in the tube 31 of the ice making / deicing heat exchanger 22 returns to the compressor 1 via the four-way valve 2.

After a lapse of a predetermined time from the ice making, a deicing operation is performed.
During this de-icing operation (reverse cycle), the high-temperature and high-pressure refrigerant compressed by the compressor 1 passes through the four-way valve 2 as shown by a white arrow in FIG. To condense and liquefy. At that time, the portion 13a of the ice making plate 13 around the tube 31 in the ice making / de-icing heat exchanger 22 is mainly heated to perform de-icing. Thereafter, the condensed and liquefied refrigerant is reduced in pressure by the expansion device 4 to be in a low-pressure two-phase state, evaporated in the outdoor heat exchanger 3, and returned to the compressor 1 via the four-way valve 2.

After the completion of the deicing operation, the electromagnetic two-way valve 26 is opened and the deicing heat exchanger 23 performs a deicing operation (forward cycle), as indicated by the thick solid arrow in FIG. The high-temperature and high-pressure refrigerant compressed by the compressor 1 is supplied to the electromagnetic two-way valve 26.
, And flows into the deicing heat exchanger 23. At this time, since the tube 32 of the deicing heat exchanger 23 is provided close to the tube 31 of the ice making / deicing heat exchanger 22,
The compressed high-temperature and high-pressure refrigerant that has flowed into the tube 32 of the deicing heat exchanger 23 is
The portion 13b in the vicinity is mainly heated to perform deicing.
Thereafter, the condensed and liquefied refrigerant returns to the compressor 1 via the four-way valve 2.

The point of the refrigeration cycle of this dynamic type ice heat storage device is that when the ice is separated, the cycle is switched to the reverse cycle, and the refrigerant as the discharge gas flows into the ice making / deicing heat exchanger 22 to exchange heat with latent heat. After a predetermined period of time, the refrigerant, which is the same discharge gas, flows into the deicing heat exchanger 23 through the electromagnetic two-way valve 26 while maintaining the reverse cycle, and the latent heat is used for heat exchange. Since all of the heat exchange is performed by latent heat, it is efficient and time is shortened.

As described above, according to the present embodiment, the heat exchanger 21 is provided with an ice making / de-ice heat exchanger 22 for performing ice making (forward cycle) and de-ice (reverse cycle), and Since it is constituted by the deicing heat exchanger 23 which performs the normal cycle, the reverse cycle deicing operation for heating the ice making / deicing heat exchanger 22 and the deicing heat exchanger 23 during deicing. By sequentially performing the normal cycle de-icing operation, the entire ice making plate 13 is heated by the latent heat of condensation of both the ice making / de-ice heat exchanger 22 and the de-ice heat exchanger 23, and the ice made on the ice making plate 13 The whole can be deiced in a short time. Therefore, ice for heat storage can be efficiently made in a short time.

[Second Embodiment] FIG. 3 is a circuit diagram showing a refrigerant circuit of a dynamic ice heat storage device according to a second embodiment of the present invention, and FIG. 4 is a sectional view taken along the line CC of FIG. The dynamic ice heat storage device according to the first embodiment is different from the dynamic ice heat storage device according to the first embodiment in that the heat exchanger 21 is different from the heat exchanger 21 according to the first embodiment.
Is composed of an ice making / de-icing heat exchanger 22 for performing ice making (forward cycle) and de-icing (reverse cycle) and a de-ice heat exchanger 23 for performing de-ice (forward cycle). The dynamic ice heat storage device of the embodiment is characterized in that a heating device (heating means) 41 such as an electric heater is provided between the meandering tubes 12 of the ice making / deicing heat exchanger 5.

In this dynamic type ice heat storage device, the deicing cycle is only the reverse cycle of the ice making cycle as in the prior art, but instead of the deicing heat exchanger 23, the ice making / deicing heat exchanger 5 is used. After the ice making operation and the de-icing operation by the reverse cycle are performed, the heating device 41 is disposed between the tubes 12 to heat the heating device 27, thereby obtaining the same as the dynamic ice heat storage device of the first embodiment. The effect can be achieved.

The embodiments of the dynamic ice heat storage device of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and does not depart from the gist of the present invention. Can be used to change the design. For example, the tube 12 of the ice making / deicing heat exchanger 5
May be arranged in a zigzag shape in addition to the meandering shape. Further, the arrangement, shape, and the like of the tubes 31, 32, and 12 can be changed as necessary.

[0030]

As described above, according to the ice heat storage device of the first aspect of the present invention, the refrigerant compressed by the compressor is introduced into the ice making / deicing heat exchanger. Since a heat exchanger for deicing that heats and deices the ice that was
During de-icing, the reverse cycle de-ice operation for heating the ice making / de-ice heat exchanger and the normal cycle de-ice operation for heating the de-ice heat exchanger are sequentially performed, so that the heat for ice making / The entire ice making plate can be heated by the latent heat of condensation of both the heat exchanger and the deicing heat exchanger, and the entire ice made on the ice making plate can be deiced in a short time. Therefore, ice for heat storage can be efficiently made in a short time.

According to the second aspect of the present invention, since the ice making / deicing heat exchanger is provided with heating means for heating the ice made and deicing, the ice making / deicing heat exchanger is provided. By performing a reverse cycle deicing operation for heating the ice making / deicing heat exchanger and heating by the heating means, the latent heat of condensation of the ice making / deicing heat exchanger and the heating of the heating means cause the entire ice making plate to be heated. Can be heated, and the whole ice made on the ice making plate can be deiced in a short time. Therefore, ice for heat storage can be efficiently made in a short time.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a refrigerant circuit of a dynamic ice heat storage device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a circuit diagram showing a refrigerant circuit of a dynamic ice heat storage device according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line CC of FIG. 3;

FIG. 5 is a circuit diagram showing a refrigerant circuit of a conventional dynamic ice heat storage device.

FIG. 6 is a sectional view taken along line AA of FIG.

FIG. 7 is an enlarged sectional view of a portion A in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve (switching valve) 3 Outdoor heat exchanger (Heat exchanger for condensation / evaporation) 4 Throttle device 5 Heat exchanger for ice making / deicing 6-8 Refrigerant piping 9 Water pump 10 Spraying pipe 12 Tube 13 ice making plate 13a part 13b other part 14 ice 21 heat exchanger 22 ice making / deicing heat exchanger 23 deicing heat exchanger 24, 25 check valve 26 electromagnetic two-way valve 27, 28 refrigerant pipe 31 tube 32 Tube 41 heating device (heating means)

Claims (2)

[Claims] 1. A condenser for compressing a refrigerant, a condensing / evaporating heat exchanger for condensing and liquefiing the compressed refrigerant during ice making and evaporating the condensed and liquefied refrigerant during deicing, and an ice making plate. An ice making / de-icing heat exchanger for performing ice making by absorbing heat of the liquefied refrigerant and de-icing by releasing heat when the refrigerant is condensed and liquefied, and a refrigerant flow passage connected to these heat exchangers and the compressor And a throttle device provided between the two heat exchangers for reducing pressure of the condensed and liquefied refrigerant, and an ice heat storage device for selectively performing an ice making cycle and a deicing cycle by switching the switching valve. Wherein the ice making / de-ice heat exchanger is provided with a de-ice heat exchanger for introducing the refrigerant compressed by the compressor to heat the ice-made ice and de-ice. Ice storage device. 2. A condensing apparatus comprising: a compressor for compressing a refrigerant; a condensing / evaporating heat exchanger for condensing and liquefying the compressed refrigerant during ice making and evaporating the condensed and liquefied refrigerant during deicing; An ice making / de-icing heat exchanger for performing ice making by absorbing heat of the liquefied refrigerant and de-icing by releasing heat when the refrigerant is condensed and liquefied, and a refrigerant flow passage connected to these heat exchangers and the compressor And a throttle device provided between the two heat exchangers for reducing pressure of the condensed and liquefied refrigerant, and an ice heat storage device for selectively performing an ice making cycle and a deicing cycle by switching the switching valve. The ice heat storage device according to any one of claims 1 to 3, wherein the ice making / deicing heat exchanger is provided with heating means for heating the ice made and deicing.