KR101658462B1 - Layered type thermal energy storage - Google Patents

Abstract

The present invention relates to a flat panel display device comprising a plurality of flat panel tubes extending in a predetermined cross-sectional shape so as to form a flow path of a brine and spaced apart from each other, and a cross section corresponding to the flat panel tubes extending along the extending direction of the flat panel tubes And a plate-like porous material having pores for storing a phase change material that is melted or solidified by exchanging heat with the brine and arranged to form a contact surface with an outer wall of the plate tube, Shaped porous material to maintain a shape of the contact surface and form a molten interface moving from both sides of the plate-like porous material to the inside thereof, and melting the phase-change material at a central portion of the plate- Are arranged symmetrically on both sides of the material and are stacked alternately with the porous material It provides a multi-layer axial cooling air as claimed.

Description

{LAYERED TYPE THERMAL ENERGY STORAGE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cold storage unit which is a container for storing and discharging cold heat required for cooling by using the phase change characteristics of solidification and melting of a phase change material.

A cooling-type cooler is a collective term for a cooling system that stores cold heat (energy required for cooling) required for cooling in advance and uses cold heat prepared when necessary. That is, in the case of intermittently generating heat, the cooling-type cooler is a method of preparing and using cold heat necessary for cooling for a long time in advance.

There are two main types of cooling methods. One uses the latent heat generated when the phase changes, and the other uses the sensible heat. In general, the latent heat is larger than the sensible heat, so that the method using the latent heat has a merit that the temperature is constant during the phase change and the heat is stored and discharged without changing the temperature. In order to take advantage of these advantages, a cooling system using latent heat is mainly used in a quench type cooler.

Among them, the cooler type cooler using the phase change material is mainly used in the cooler type cooler because it uses a solid or liquid phase change material and is easy to handle and operates at atmospheric pressure. However, since the thermal conductivity of the phase change material used in the quench type cooler is generally very low, there is a disadvantage in that the heat transfer performance is poor.

The cold air cooler is one of the core components of the cooler type cooler, which stores the cold heat required for cooling by utilizing the latent heat of the phase change material generated during melting or solidification in the cooling type cooler. Currently, various types of axial coolers are being used.

In the prior art embodiments, only a small number of phase change materials around the tube were used for brine cooling due to the low heat transfer performance between the brine and the phase change material due to the low thermal conductivity of the phase change material. Therefore, a phase change material that does not participate in the brine cooling, that is, a dead volume, exists. This insoluble volume weighs the weight of the freezing unit and causes waste of the phase change material.

In another conventional embodiment, fins, expansion structures, porous materials, etc. are used to enhance the heat transfer performance between the brine and the phase change material. As an example of a porous material, a phase change material is stored in numerous pores present in the porous material, and the phase change material and the brine exchange heat through the porous material.

1 is a cross-sectional view showing the structure of a cooling device 10 in which a plurality of circular tubes 11 are inserted in a phase change material 12. Fig. Under such a structure, the phase change material 12 around the circular tube 11 is melted by exchanging heat with the brine flowing through the circular tube 11, and the melted phase change material 12 is circulated around the circular tube 11 It is enclosed. The molten interface 13 of the phase change material 12 maintains a circular shape and moves in the radial direction of the tube 11.

However, if the molten bond interface 13 expands and the adjacent molten bond interface 13 as shown in FIG. 1 contacts, the area of the molten bond interface 13 drastically decreases. This means that the substantial heat transfer area to the solid phase change material 12 is reduced, which means that the heat transfer performance in the cooler 10 is lowered. Under this structure, the insoluble volume 14 of the phase change material 12 still exists.

It is an object of the present invention to provide a compact and lightweight freezing chamber by effectively reducing the amount of insolubles present in the freezing chamber to thereby effectively reduce the heat transfer performance .

Another object of the present invention is to provide a structure of a cooling and cooling machine capable of easily increasing a capacity.

Still another object of the present invention is to provide a cold storage device that is simple to manufacture.

According to an aspect of the present invention, there is provided a refrigerator including: a plurality of flat tubes extending in a predetermined shape to form a flow path of a brine and spaced apart from each other; And a pore for storing a phase change material that is melted or solidified by exchanging heat with the brine, the pore having a cross section corresponding to the flat plate and extending along the extending direction of the flat plate, And a plate-like porous material disposed to form the porous plate. At this time, the plurality of flat tubes maintains the shape of the contact surface at the time of cooling, forms a molten interface moving from both sides of the plate-like porous material to inside, and melts the phase-change material at the center of the plate- Are arranged symmetrically on both sides of the plate-like porous material and are stacked alternately with the porous material so as to limit heat transfer performance degradation.

According to an example of the present invention, the plurality of flat tubes may have a rectangular section with a large slenderness ratio.

According to another embodiment of the present invention, the plurality of flat tubes are provided with multiple channels having a plurality of brine channels so as to distribute the brine flow in the flat tube and ensure structural stability.

According to another embodiment of the present invention, the plurality of flat tubes may be multichannels having a plurality of fine channels having a height of 1 to 9 mm in order to improve the heat transfer performance in the flat tubes.

According to another embodiment of the present invention, the plate-like porous material may be formed of any one of copper, aluminum, and graphite.

According to another embodiment of the present invention, the plurality of plate-shaped porous materials are stacked and cross-stacked with the plurality of flat tubes to enable capacity expansion.

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According to the present invention having the above-described structure, since the shape of the melting interface of the phase change material meets two melting interfaces, the change is small until the melting is completed, and there is no sharp decrease in heat transfer performance, It is possible to provide both small and lightweight freezers with no insoluble volume.

It is easy to expand the capacity of the cooler by cross-stacking the plurality of flat plate tubes and the plate-like porous material.

The cold storage device according to the present invention includes a flat plate and a plate-like porous material, and thus the manufacturing process is simple.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a cooling and cooling device according to a conventional embodiment;
2 is a perspective view of a cooling and cooling device according to an embodiment of the present invention;
Figure 3 is a perspective view of a cold air cooler in accordance with another embodiment of the present invention.
Figure 4 is a perspective view of a shaft cooler in accordance with another embodiment of the present invention;
5 is a perspective view of a shaft cooler in accordance with another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a cooling / cooling device according to the present invention will be described in detail with reference to the drawings.

In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. Furthermore, the singular < RTI ID = 0.0 > terms < / RTI > used herein include plural referents unless the context clearly dictates otherwise.

2 is a perspective view of a cooling and cooling device 200 according to an embodiment of the present invention.

Referring to FIG. 2, the cooler 200 includes a plurality of flat tubes 210 and a plate-like porous material 220. Specifically, the cold storage unit in this embodiment includes two flat plate pipes 210 and one plate-like porous material 220. The brine, which is a medium for transporting heat, can flow through the duct of the flat tube 210.

 For this purpose, the flat tube 210 is formed with a predetermined cross-section. The brine flows along this extension direction and carries heat. In this embodiment, the end surface of the flat tube 210 is rectangular, but a cross section of the flat tube 210 according to the present embodiment may be used as long as it has two surfaces that are substantially parallel to each other.

Also, the plurality of flat tubes 210 may have a rectangular cross section with a large slenderness ratio.

In addition, the plurality of flat plate pipes 210 can form a micro channel (1 to 9 mm) having a low height. In this case, the equivalent flow path that dominates the heat transfer, that is, the hydraulic diameter is reduced, and the additional effect that the heat transfer performance in the tube is improved can be obtained.

The two flat tubes 210 are spaced apart from each other. More specifically, the two flat tubes 210 each have an outer wall 211, and each of the outer walls 211 is arranged to face each other. The flat tubes 210 are spaced apart from each other so that the plate-like porous material 220 may be disposed between the flat tubes 210.

The plate-like porous material 220 is formed such that a cross section corresponding to the flat plate 210 extends along the extending direction of the flat plate 210. The section corresponding to the flat plate 210 means a section having substantially the same shape as the section of the flat plate 210 if the width or height is adjusted.

The plate-like porous material 220 also has pores for storing the phase change material that is melted or solidified by exchanging heat with the brine. The pores of the plate-like porous material 220 have a size of several tens to several hundreds of micrometers.

The plate-shaped porous material 220 is disposed to form a contact surface with the outer wall 211 of the flat tube 210. That is, the outer wall 211 of the flat plate 210 and the outer side 221 of the plate-like porous material 220 are arranged to be in contact with each other. As a result, the flat outer surface 221 of the plate- 210 are in contact with each other. At this time, the outer surface 221 of the plate-like porous material 220 is substantially the same as the shape of the outer wall 211 of the flat plate 210. The shape of the contact surface is substantially equal to the shape of the outer surface 221 of the plate-like porous material 220 or the outer wall 211 of the flat tube 210.

On the other hand, the shape of the outer wall 211 of the flat plate 210 and the shape of the outer side 221 of the plate-like porous material 220 may be different from each other. In this case, The shape of the outer wall 211 of the plate-like porous material 220 and the shape of the outer surface 221 of the plate-like porous material 220 may be different. However, the shape of the outer surface 211 of the flat plate 210, the outer surface 221 of the plate-like porous material 220, and the contact surface should be substantially the same for effective heat transfer.

The heat is transferred to the inner wall 212 of the flat plate 210, the outer wall 211 of the flat plate 210 and the outer wall 211 of the plate-like porous material 220 in the brine flowing along the channel of the flat plate 210. [ And sequentially moves to the phase change material stored inside the outer side surface 221 and the plate-like porous material 220. The heat can also be moved in the reverse direction.

The brine flowing along the channel of the flat tube 210 by such a heat exchange is cooled or heated. The phase change material stored in the plate-like porous material 220 is melted or solidified. Specifically, on cooling, the brine is cooled and the phase change material is melted.

As the melting of the phase change material proceeds, a melting interface 222 of the phase change material is formed within the plate-like porous material 220. This molten interface 222 is generated from the outer surface 221 of the plate-like porous material 220 through which the heat transferred from the brine first passes. Therefore, the melting interface 222 has a shape substantially identical to the shape of the outer surface 221 of the plate-like porous material 220.

The shape of the outer surface 221 of the plate-like porous material 220 is substantially the same as the shape of the contact surface between the plate 210 and the plate-like porous material 220, so that the shape of the melting interface 222 Is substantially the same as the shape of the contact surface.

When the shape of the outer wall 211 of the flat plate 210, the shape of the outer surface 221 of the plate-like porous material 220 and the shape of the contact surface are different from each other, the shape of the melting interface 222 is substantially heat The shape of the contact surface to be transferred will be substantially the same.

As the heat transfer progresses, the phase change material inside the plate-like porous material 220 melts more. That is, only the phase change material stored near the outer surface 221 of the plate-shaped porous material 220 is melted at the beginning of heat transfer, but the phase change material stored in the central portion of the plate-shaped porous material 220 is melted as the heat transfer continues. In other words, the molten interface 222 formed from the outer surface 221 of the plate-shaped porous material 220 moves to the center of the plate-like porous material 220.

 Since the flat plate 210 is in contact with the outer side surfaces 221 of the plate-like porous material 220, the molten interface 222 is generated from the outer side surfaces 221 of the plate- And as a result, there are two melting interface surfaces 222 inside the single plate-like porous material 220.

Shaped porous material 220 to form a molten interface 222 that moves from both sides of the plate-like porous material 220 to the inside of the plate-like porous material 220, and the melting interface 222 of the phase- (210) are disposed symmetrically on both sides of the plate-like porous material (220) and are stacked alternately with the plate-like porous material (220).

That is, the molten interface 222 formed from the outer surface 221 of the plate-like porous material 220 and having substantially the same shape as the outer surface 221 can be changed in shape until the melting is completed Thus limiting the rapid deterioration of the heat transfer performance. This is because the molten interface 222 moves into the inside of the plate-like porous material 220 while maintaining substantially parallel to the outer surface 221 of the plate-like porous material 220.

In addition, as the melting interface is completed at the center of the plate-like porous material 220, the molten interface 222 is almost not present. As a result, almost no insoluble volume is present in the plate-like porous material 220.

Hereinafter, another embodiment of the cooling and cooling device related to the present invention will be described in more detail.

3 is a perspective view showing another embodiment of the axial cooler 300 related to the present invention.

Referring to FIG. 3, the axial cooler 300 according to the present embodiment includes a plurality of flat tubes 310 and a plurality of plate-like porous materials 320. Since the plurality of flat tubes 310 are disposed symmetrically on both sides of the plate-like porous material 320, the number of the flat tubes 310 may be more than the number of the plate-like porous materials 320.

In FIG. 3, five plate pipes 310 and four plate-shaped porous materials 320 are stacked alternately. However, the present invention is not limited thereto and may be more or less.

If one embodiment shown in Fig. 2 is referred to as a single stack and another embodiment shown in Fig. 3 is referred to as a multi-stack, it is possible to expand the capacity of the stall cooler 300 by performing multiple stacking. That is, the axial cooler 300 according to the present invention expands in proportion to the number of stacked layers.

The heat is transferred to the inner wall 312 of the flat plate 300, the outer wall 311 of the flat plate 300, the plate-like porous material 320, and the like, in the brine flowing along the channel of the flat plate 310, Shaped porous material 320 and the phase change material stored in the inside of the plate-like porous material 320. Also, as in the case of a single stack, heat can be moved in the opposite direction. The arrows shown in Fig. 3 indicate the movement of the columns.

Since the flat plate 310 is in contact with the outer side surfaces 321 of the plurality of plate-like porous materials 320, the molten interfacial surfaces 322 are separated from the outer side surfaces 321 of the plate- And as a result, there are two melting interface surfaces 322 in one plate-like porous material 320.

A plurality of flat plate members 320 are formed so as to form a molten interface 322 that moves from both sides of the plate-like porous material 320 to the inside and meet the melting interface 322 of the phase change material at the center of the plate- The plurality of plate-shaped porous materials 320 are arranged symmetrically on both sides of the plurality of plate-shaped porous materials 320, and are stacked in multiple layers crossing the plurality of plate-shaped porous materials 320.

In this case, the molten interface 322 has substantially the same shape as the outer surface 321 of the plate-like porous material 320 and is substantially parallel to the outer surface 321 of the plate- .

Hereinafter, another embodiment of the cooling and cooling device related to the present invention will be described in more detail.

4 is a perspective view of a cold storage 400 according to another embodiment of the present invention.

The axial cooler 400 according to the present embodiment includes a multi-channel flat plate 410. That is, the multi-channel flat-plate pipe 410 has a plurality of channels through which brine flows. Accordingly, the brine flows through the plurality of channels 411 provided in the single flat tube 410, respectively, to perform heat exchange and thereby to be cooled or heated.

By using the multi-channel flat plate pipe 410 as described above, the flow in the flat plate pipe 410 can be distributed and the structural stability can be ensured. At this time, each channel 411 can form a micro channel (1 to 9 mm) having a low height. In this case, it is possible to obtain an additional effect that the equivalent flow path that governs the heat transfer, that is, the size of the hydraulic diameter is small, thereby improving the heat transfer performance in the tube.

Although FIG. 4 shows an example in which a plurality of channels 411 are provided in a single flat plate 410, it is also possible to form a multi-channel flat plate by stacking the respective channels in the height direction.

Hereinafter, another embodiment of the cooling and cooling device related to the present invention will be described in more detail.

Fig. 5 is a perspective view showing still another embodiment of the axial cooler 500 related to the present invention.

The axial cooler 500 according to the present embodiment includes a plurality of multi-channel flat plates 510 and a plurality of plate-like porous materials 520. Since the plurality of multi-channel flat plates 510 are disposed symmetrically on both sides of the plate-like porous material 520, the number of the flat plates 510 may be more than the number of the plate-like porous materials 520.

5, five multi-channel flat plate 510 and four plate-like porous materials 520 are stacked alternately. However, the present invention is not limited thereto, but may be more or less.

By stacking the multi-channel flat plate 510 and the plate-like porous material 520 in multiple layers, it is possible to expand the capacity of the cooler. That is, the cooling fan 500 according to the present invention expands in proportion to the number of stacked layers.

As in the case of stacking the single channel flat plate and the plate type porous material, heat is applied to the inner wall of the flat plate 510, the outer wall of the flat plate 510, the plate porous material 520 And the phase change material stored in the inside of the plate-like porous material 520. The heat can also be moved in the reverse direction.

The plate-like porous material described above may be formed of any one of copper, aluminum, and graphite. That is, the plate-like porous material may be made of a material having a relatively high thermal conductivity as compared with other metals.

In particular, graphite has a characteristic that the thermal conductivity varies depending on the crystal direction. Therefore, when the plate-like porous material is formed of a graphite material, it must be arranged in a direction having the highest thermal conductivity among the various crystal directions of the graphite.

In addition, the plate-like porous material in which the plate-like tube and the phase-change material are stored can be assembled by using an adhesive method such as brazing, compression by mechanical fastening, thermal grease or thermal paste.

Further, the method of manufacturing the cold storage device according to the present invention is simpler than the method of manufacturing the cold storage device according to the prior art. That is, since the present invention uses a flat plate and a plate-like porous material, it does not require processing of a separate porous material for insertion of a cooling tube such as a hole operation or an expansion.

The above-described stacked type axial cooler is not limited to the configuration and the method of the embodiments described above, but all or some of the embodiments may be selectively combined so that various modifications may be made to the embodiments.

Claims (6)

A plurality of flat tubes which are formed by extending with a cross section of a certain shape so as to form a flow path of brine and are spaced apart from each other; And
And a pore for storing a phase change material that is melted or solidified by exchanging heat with the brine, the pore having a cross section corresponding to the flat plate and extending along the extending direction of the flat plate, A plate-like porous material disposed to form a contact surface,
The plurality of flat tubes may include:
Like porous material is disposed on both sides of the plate-shaped porous material, and the shape of the contact surface is maintained at the time of coolsing, so that each of the molten interface surfaces having the same shape as the outer surface of the plate- Forming,
Wherein each of the molten interface faces,
Like porous material is moved toward the inside of the plate-like porous material on both sides of the plate-like porous material and is mutually contacted at a central portion of the plate-
Wherein heat is transferred to the phase change material through the inner wall of the flat plate, the outer wall of the flat plate, and the outer side of the plate-like porous material from the brine flowing along the flow path of the flat plate. The method according to claim 1,
Wherein the plurality of flat tubes are multichannels having a plurality of brine channels so as to distribute the brine flow in the flat tube and to ensure structural stability. The method according to claim 1,
Wherein the plurality of flat tubes are multi-channels having a plurality of micro-channels having a height of 1 to 9 mm in order to improve heat transfer performance in the flat tubes. The method according to claim 1,
Wherein the plate-like porous material is formed of any one of copper, aluminum, and graphite. delete The method according to claim 1,
Wherein the plurality of the plate-like porous materials are stacked and cross-stacked with the plurality of flat tubes to expand the capacity.

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