JPH06273084A - Heat/cold storage apparatus - Google Patents

Abstract

PURPOSE:To provide a latent heat utilizing heat/cold/ storage apparatus in which the area of heat absorbing/ dissipating surfaces is increased without increasing in size to improve a heat exchanging efficiency. CONSTITUTION:A porous heat transfer material is brought into contact with a heat storage material 3 contained in a sealed vessel 2. Foamed metal 1 is placed in contact with the heat storage material 3 in a structure in which impregnation of the molten material 3 is prevented, and heating medium is fed to pores of the metal 1. The metal has a very large surface area to become heat absorbing/dissipating surface, and hence the heat exchanging efficiency is enhanced even if many thin pipes are not provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage and cold storage device for storing and releasing heat by utilizing sensible heat of a substance and latent heat associated with phase change, a heat storage method using this device, and heat exchange with improved heat transfer efficiency. Regarding the device.

[0002]

2. Description of the Related Art In order to effectively use heat energy, it has become active to collect and store exhaust heat and the like and use it for cooling and heating, hot water supply and the like when necessary. One of the heat storage and cool storage devices used for such purposes is one that uses the latent heat of fusion of a substance. The heat storage and cool storage materials used in this latent heat utilization type device generally have low thermal conductivity. In addition, the heat conduction effect due to heat convection during use is small. Therefore, the latent heat type device is
If an attempt is made to increase the heat storage amount by increasing the usage amount of the heat storage or cold storage material, the heat will not be evenly distributed over the whole, and the utilization efficiency of the heat storage or cold storage material will be reduced.

In the case of an apparatus utilizing sensible heat, as a measure against the above-mentioned problem, the heat storage and cold storage materials can be made into particles as small as possible, and the heat medium can be directly contacted with the particles having a large volume specific surface area. The utilization type device requires special treatment such as covering the particles with a shell because the heat storage material and the cold storage material change from the solid phase to the liquid phase, which causes technical difficulties and increases the cost burden. This kind of measure is not suitable.

Therefore, it is possible to increase the heat storage efficiency by inserting heat storage / cooling material into the pores of the foam metal and transmitting the heat through the skeleton of the foam metal.
It is proposed in Japanese Utility Model No. 63-46115.

However, the heat exchange portion with the heat medium or the like has not been devised so much. That is, as shown in FIG. 4, the cell 11 in which the heat storage material and the cold storage material are enclosed is connected to the conduit 12
The heat medium 13 that has been placed in the middle of the pipe and has flowed into the pipe is brought into contact with the surface of the cell, or as shown in FIG.
The heat is absorbed and dissipated by, for example, flowing. This is also the case when the above-mentioned heat storage or cold storage material in which a foam metal is combined is used.

[0006]

In the conventional heat exchange method as described above, since the area of the heat exchange portion is small, heat storage and cold storage unevenness can occur, and the utilization efficiency of the heat storage and cold storage material does not sufficiently increase.

Therefore, when it is necessary to increase the heat exchange rate, the surface area of the heat exchange portion is increased by lengthening the heat exchange portion, or by encircling a large number of thin tubes and passing a heat medium through the thin tubes. A method is used in which irregularities are formed on the inner surface of the pipe to generate turbulent flow, but this type of method involves the problems of complicating the device and increasing its size.

An object of the present invention is to eliminate these problems.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a heat storage / cooling material in a heat storage tank, a porous heat transfer material made of foam metal, metal wool, etc. The structure is such that impregnation is prevented, and the heat storage and the cold storage material are brought into and out of contact with each other through the porous heat transfer material. When this heat storage / cool storage device is used, a heat medium can be caused to flow through the voids of the porous heat transfer material, and thermal energy can be absorbed from this heat medium via the porous heat transfer material and stored in the heat storage / cool storage material.

Also, in the heat exchange device of the present invention, the first conduit for passing the first heat medium penetrates the second conduit for allowing the second heat medium to pass through, and at this penetrating portion, the inside of the first and second conduits Each of them is filled with a porous heat transfer material made of foam metal, metal wool or the like so that heat transfer between the first and second heat transfer mediums is performed through the porous heat transfer material.

The heat exchanging device and the heat accumulating / cooling device described above increase the heat exchanging rate based on the same principle. The heat exchange device of the present invention is a heat storage device or a cold storage device when the porous heat transfer material in the first pipeline, the second pipeline, or both the first and second pipelines is brought into contact with the heat storage or cool storage material. It becomes the structure including.

[0012]

[Function] The porous heat transfer material has a very large surface area. In the present invention, heat energy is absorbed or released therefrom, so that the heat exchange rate is increased, and the time required for storage, heat dissipation, or heat exchange between heat mediums is shortened.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the heat storage / cool storage device of the present invention. The illustrated device is a heat storage device. In the figure, 1 is a breathable metal foam, 2 is a closed container forming a heat storage tank, 3 is a heat storage material housed in the container, and a heat storage device A is configured by the above three elements. This device becomes a cool storage device when a cool storage material is used instead of the heat storage material 3.

When the heat storage material 3 in the liquid phase is impregnated into the metal foam 1, the metal foam is clogged so that the heat medium cannot pass through it. When the pore diameter of the foam metal is small or the heat storage material 3 exhibits a high viscosity in the liquid state, the foam metal 1 is replaced with the cool storage material 3 as shown in the figure.
Although the purpose of preventing impregnation may be achieved even if it is directly contacted with, the partition wall is interposed in the contact portion if it is not desired. When metal wool is used instead of foam metal, the metal wool is packed in a pipe so that it does not come loose. At this time, the pipe can be used as a partition for preventing impregnation.

The heat storage device A having the above-mentioned structure is used in the container 2
The pipe 4 is connected to the pipe 4, and the heat medium flows through the pipe 4. The heat medium passes through the voids of the foamed metal, and the heat held by the heat medium at this time is absorbed by the foamed metal 1, and is transferred to the heat storage material 3 via the foamed metal and stored therein. In addition, heat is dissipated when required by a mechanism opposite to this.

The heat storage material 3 may be a composite with a foam metal other than the foam metal 1 shown in the figure.

FIG. 2 shows an example of use of the heat storage device. In the heat storage device A used here, the foam metal 1 is put in the closed container 2, and the heat storage material 3 is enclosed in the foam metal. This device was connected to a heater 5 and a radiator 6 via a pipe line 4 with a valve as shown in the figure. Then, the heat medium in the tube was heated by the heater 5, the heated heat medium was passed through the heat storage device A by opening the valve 7 on the heater side, and heat was sufficiently stored in the heat storage material 3. After that, the valve 7 was closed, the valve 8 on the radiator side was opened to warm the heat medium, and heat was radiated from the radiator 6. As a result, compared with the case where the metal foam 1 was not used, the time was shortened by about 5% both during heat storage and during heat radiation.

FIG. 3 shows an example of the heat exchange device of the present invention. As shown in the figure, the secondary side conduit 10 is penetrated into the primary side conduit 9, and the conduits 9 and 10 are filled with the foam metal 1a and 1b, respectively, at this penetrating portion to form the heat exchange device B. did. In addition, here, the conduit 9 on the primary side was in contact with the heater 5, and the conduit 10 on the secondary side was connected to the radiator 6. A heat medium to be circulated through the voids of the foamed metals 1a and 1b is enclosed in each pipe.

In this device configuration, the heat medium on the primary side is heated by the heater 5, and the heat of the heat medium is transferred to the heat medium on the secondary side by the heat exchanging device B to dissipate heat from the radiator 6 and heat radiation. Checked the temperature.

As a result, the flow rate of the secondary side heat medium was increased by about 5% compared to when the foam metal 1a, 1b was not used, and the same heat radiation temperature could be secured.

The heat exchange device of FIG. 3 has a structure including the heat storage device, for example, when the heat storage material 3 is built in at the position of the chain line in the figure, and stores heat in the heat storage material 3 at low cost at night, and when necessary. It becomes possible to use the heat for heating, hot water supply, etc.

[0022]

As described above, in the heat storage, cool storage device or heat exchange device of the present invention, heat is allowed to flow in and out of the surface of the porous heat transfer material. The heat exchange rate can be increased, which can contribute to downsizing, simplification, and capacity enhancement of the device.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a heat storage / cool storage device of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the heat storage and cold storage device in a used state.

FIG. 3 is a cross-sectional view showing an example of a heat exchange device.

FIG. 4 is a sectional view showing an example of a conventional heat storage / cool storage device.

FIG. 5 is a perspective view showing another example of a conventional heat storage / cool storage device.

[Explanation of symbols]

 1, 1a, 1b Metal foam 2 Closed container 3 Heat storage material A Heat storage device B Heat exchange device

Claims (4)

[Claims] 1. A heat storage and cool storage material in a heat storage tank, a foam metal,
A porous heat transfer material made of metal wool or the like is contacted in a structure in which heat storage and cold storage material impregnation are blocked, and heat energy is transferred to and from the heat storage and cold storage material through the porous heat transfer material. Characteristic heat storage, cold storage device. 2. A heat storage / cool storage device according to claim 1, wherein a heat medium is caused to flow into the void portion of the porous heat transfer material, and heat energy is absorbed from the heat medium via the porous heat transfer material to store or cool the heat. How to store heat and cold in materials. 3. A first pipeline through which the first heat medium is passed through a second pipeline through which the second heat medium is passed, and at the penetration portion, the first,
A heat exchange in which a porous heat transfer material made of foam metal, metal wool, or the like is filled in the second pipe line so that heat transfer between the first and second heat transfer mediums is performed through the porous heat transfer material. apparatus. 4. In the first pipeline, in the second pipeline or in the first pipeline,
The heat exchange device according to claim 3, wherein the porous heat transfer material in each of the second both pipes is in contact with the heat storage or cool storage material to form the heat storage or cool storage device according to claim 1.