JPH05196379A - Cold heat accumulating device - Google Patents

Abstract

PURPOSE:To provide a cold heat storing device wherein heat storage density is high and heat can be effectively utilized, and besides is manufactured at a low cost. CONSTITUTION:A cold heat storing device comprises a heat storage tank A which is provided inside a heat-exchanger 6 and filled with a high melt point emulsion 3 being a latent heat accumulating material H, a heat accumulating tank B which is provided inside a heat-exchanger 7 and filled with a low melt point emulsion 4 being a latent heat storing material L, a radiator 11, pipings 13 and 19-21 through which the heat accumulating tanks A and B are connected to the radiator 11, a pump 5 with the aid of which the a latent heat accumulating material H or L is caused to flow in the piping, and control valves 15-18 to switch the latent heat accumulating material, fed to the radiator 11, to H or L. The latent heat accumulating material H or L is caused to impart or receive heat in the heat accumulating tank A or B by the radiator 11 and returned to an original heat accumulating tank. Dispersion liquid prepared such that a phase change material dissoluble in liquid forming a continuous phase and molten at temperature higher than that of the liquid is dispersed in the liquid is used as the latent heat accumulating material H and L. The latent heat accumulating materials H and L are different in melting point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus (or system) for storing heat (cooling) or transferring heat by using a heat storage body utilizing latent heat generated by a phase change.

[0002]

2. Description of the Related Art A latent heat storage material has a characteristic that the temperature of heat radiation or heat absorption is constant and the heat storage density is high. As a usage form of this latent heat storage material, it is generally used by enclosing it in a container, but it is encapsulated, dispersed and fixed in a matrix, or dispersed in a continuous phase. What has been done has been actively researched in recent years.

However, in general, a latent heat storage material has only one melting point (freezing point). For example, when it is desired to use both the high temperature side and the low temperature side, one uses latent heat and the other uses sensible heat. In most cases, they exchanged heat. FIG. 2 shows a conventional example of such a cold storage device. In FIG. 2, 31 is a heat storage tank, 32 is a blower, 33 is a latent heat storage material, 35 is a pump, 37 is a heat exchanger, 38 is a heat pump, 41 is a heat exchanger of a radiator, 44 is refrigerant piping, 4
Reference numeral 7 is a control valve, and 49 is a pipe through which the latent heat storage material is passed. When using capsules, different latent heat storage materials were enclosed in two types of containers for use.

[0004]

When the sensible heat of the latent heat storage material is used, the heat storage density is generally small,
The heat cannot be used effectively. Moreover, when two types of capsules are used, it becomes very expensive. An object of the present invention is to provide a cold heat storage device which has a high heat storage density and can effectively use heat and is inexpensive.

[0005]

In order to solve the above-mentioned problems, the present invention has a heat storage tank A having a heat exchanger inside and containing a latent heat storage material H, and a latent heat storage having a heat exchanger inside. The heat storage tank B in which the material L is put, a heat radiation section, a pipe connecting the heat storage tanks A and B and the heat radiation section, a pump for flowing the latent heat storage material H or L in the piping, and latent heat sent to the heat radiation section A means for switching the heat storage material between H and L is provided,
The latent heat storage material H or L, which has stored heat in the heat storage tank A or B, is designed to transfer heat to and return to the original heat storage tank in the heat radiating section, and become a continuous phase as the latent heat storage material H and L. A dispersion liquid in which a phase change material that is insoluble in the liquid and melts at a higher temperature than the liquid is dispersed is used.
Provided is a cold heat storage device in which the latent heat storage materials H and L have different melting points.

As the continuous phase, for example, an aqueous solution such as an aqueous solution of ethylene glycol or an aqueous solution of propylene glycol, or a liquid such as simple water is used. As the dispersed phase, a phase change material that melts (or solidifies) at a higher temperature than the liquid of its continuous phase is used.
Those which are insoluble in the liquid of the continuous phase, paraffin, fats and oils, olefins and the like can be mentioned. As the phase change material, for example, a material having an appropriate melting point according to the heat radiation temperature to be used is used.

For the latent heat storage material H and the latent heat storage material L, for example, one (latent heat storage material H) uses a high melting point phase change material as a dispersed phase and the other (latent heat storage material L) has a low melting point. The melting point is adjusted by using the phase change material of (1) as the dispersed phase. When the phase change material that is the dispersed phase is melted, the latent heat storage material is an emulsion, and when it is solidified, the latent heat storage material is a suspension.

As the heat dissipation part, for example, a heat exchanger is used, but the heat dissipation part is not limited to this. It should be noted that the transfer of heat in the heat radiating section means heat radiation and / or heat absorption. For example, a control valve is used as a means for switching the latent heat storage material sent to the heat radiation portion to H or L, but is not limited to this.

[0009]

The heat can be dissipated by utilizing the latent heat storage material having a high melting point during heating, and the heat can be dissipated by utilizing the latent heat storage material having a low melting point during cooling. As a result, the latent heat of the heat storage material can be effectively used.

[0010]

The present invention will be described in detail below with reference to the drawings showing the embodiments, but the present invention is not limited to the following embodiments. FIG. 1 shows a heat storage device 1 of the present invention.
An example is shown. As shown in FIG. 1, this cold storage device is
It has two heat storage tanks A and B each having heat exchangers 6 and 7, respectively. These two heat storage tanks A and B are connected by a pipe 13. A pump (or a circulation or transport pump) 5 is installed in the middle of the pipe 13, and the pump 5 branches at this pump 5. A radiator 11 is provided in the middle of the branched pipe 19. The latent heat storage material flowing through the pipe 19 is the radiator 11
It radiates or absorbs heat. The pipe 19
A pipe 20 returning to the heat storage tank A and a pipe 21 returning to the heat storage tank B are provided on the downstream side of the radiator 11 and branched into two.

In the pipe 13, a control valve 18 is provided on the heat storage tank A side of the pump 5, and a control valve 1 is provided on the heat storage tank B side of the pump 5.
7 are provided respectively. A control valve 15 is provided in the middle of the pipe 20, and the pipe 20 is opened and closed by the function of the control valve 15. A control valve 16 is provided in the middle of the pipe 21, and the function of the control valve 16 causes the pipe 21 to be opened and closed.

In FIG. 1, 8 is a heat pump, 9 is a heat exchanger, 10 is a blower, 12 is a blower, and 14 is a refrigerant pipe. The heat storage tanks A and B are filled with latent heat storage materials having different melting points. That is, one side (for example, the heat storage tank A) is filled with the latent heat storage material H having a high melting point, and the other (for example, the heat storage tank B) is filled with the latent heat storage material L having a low melting point.

Next, the operating condition of the cold energy storage system of the present invention will be described. As shown in Fig. 1, first, heat storage mode (heating)
At this time, the high-melting point emulsion 3 is enclosed in the heat storage tank A as the latent heat storage material H, and the high-melting point emulsion 3 receives heat from the heat exchanger 6 arranged inside the heat storage tank A to store heat. (In this case, for example, the phase change material melts). In this case, the control valve 18 is closed. Next, in the heat radiation mode (heating), the control valve 1
When the control valves 15 and 18 are opened while the valves 6 and 17 are closed and the pump 5 is operated, the stored high melting point emulsion 3 is conveyed to the radiator 11 and radiated by the radiator 11 (in this case, for example, a phase change). The material solidifies.)
It is returned to the heat storage tank A through the pipe 20.

Next, in the cold storage mode (cooling), the low-melting point emulsion 4 is enclosed as the latent heat storage material L in the heat storage tank B, and the low melting point from the heat exchanger 7 arranged inside the heat storage tank B. The emulsion 4 absorbs heat to store cold (in this case, for example, the phase change material solidifies). In this case, the control valve 17 is closed. Next, in the cooling mode (cooling), the control valves 16 and 17 are opened while the control valves 15 and 18 are closed, and the pump 5 is operated.
After being transferred to the heat exchanger 11 and cooled by the radiator 11 (in this case, for example, the phase change material absorbs heat and melts), it is returned to the heat storage tank B through the pipe 21.

As described above, by selecting the heat storage mode or the cold storage mode, either heating or cooling operation can be performed. In the above-described embodiment of the cold heat storage device of the present invention, the pipes for conveying the latent heat storage materials H and L to the heat radiating portion are shared, but the pipes are completely separated for the latent heat storage materials H and L, and the pumps are different. You may connect it to the pipe.

[0016]

As described above, two heat storage tanks having a heat exchanger inside are arranged, the two heat storage tanks are connected by a pipe having a pump and a control valve, and control is performed so as to branch to the pipe. A pipe having a valve and a heat radiating portion is connected to the heat storage tank so as to return to the heat storage tank, and each heat storage tank is filled with a latent heat storage material having a different melting point. By using an emulsion (or suspension) in which a dispersed phase having a high) is dispersed, it is possible to supply a cold heat storage device that effectively utilizes the latent heat of the latent heat storage material.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of a cold energy storage system of the present invention.

FIG. 2 is an explanatory view showing a conventional cold energy storage device.

[Explanation of symbols]

 A heat storage tank B heat storage tank 3 latent heat storage material H (high melting point emulsion) 4 latent heat storage material L (low melting point emulsion) 5 pump 6 heat exchanger 7 heat exchanger 11 heat radiator (heat exchanger) 13 piping 15 control valve 16 Control valve 17 Control valve 18 Control valve 19 Piping 20 Piping 21 Piping

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[Procedure amendment]

[Submission date] February 25, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

As the heat dissipation part, for example, a heat exchanger is used, but the heat dissipation part is not limited to this. Note that the transfer of heat in the heat radiating portion, release Atsuma others are endothermic. For example, a control valve is used as the means for switching the latent heat storage material sent to the heat radiating unit to H or L, but is not limited to this.

Claims (1)

[Claims] 1. A heat storage tank A having a heat exchanger inside and containing a latent heat storage material H, and a latent heat storage material L having a heat exchanger inside.
A heat storage tank B in which the heat is stored, a heat radiation section, a pipe connecting the heat storage tanks A and B to the heat radiation section, and a latent heat storage material H in the piping.
Alternatively, a pump for supplying L or a means for switching the latent heat storage material to be sent to the heat radiating section between H and L is provided, and the latent heat storage material H or L storing heat in the heat storage tank A or B is heated by the heat radiating section. Is exchanged and returned to the original heat storage tank. As the latent heat storage materials H and L, the phase change material that is insoluble in the liquid that becomes the continuous phase and that melts at a temperature higher than the liquid is dispersed. The cold storage heat storage device in which the dispersion liquid thus obtained is used, and the latent heat storage materials H and L have different melting points.