KR20040050326A - Passive cooling type cooling apparatus having multiple cooling pin structure using phase change materials and passive cooling system thereof - Google Patents

Abstract

PURPOSE: A self energy cooling apparatus and a self energy cooling system of a multi-cooling fin structure using phase change materials are provided to prevent polluted fine articles from moving in, and reduce the cost for energy. CONSTITUTION: A self energy cooling apparatus(1) includes internal and external pipes(11,12) for containing a phase change material(15), and a heat dissipating rod(14) extended from one ends of the internal and external pipes. The external pipe has a plurality of outer fins(111) formed on an outer peripheral surface thereof at regular gaps. The internal pipe is placed inside the external pipe, and has a plurality of inner fins(121) formed on an outer peripheral surface thereof at regular gaps. A cooling core(13) is inserted into the internal pipe and has a plurality of core fins(131) formed on an outer peripheral surface thereof. The phase change material is put in a space part between the internal pipe and the external pipe.

Description

PASSIVE COOLING TYPE COOLING APPARATUS HAVING MULTIPLE COOLING PIN STRUCTURE USING PHASE CHANGE MATERIALS AND PASSIVE COOLING SYSTEM THEREOF}

The present invention relates to a natural cooling device and a natural cooling system of a multiple cooling fin structure using a latent heat storage material, and more particularly, to the use of a latent heat storage material having a large heat storage capacity. The present invention relates to a cooling device having a natural circulation multi-cooling fin structure that continuously absorbs operating heat generated during operation and releases it to the outside, and a cooling system thereof.

Chillers using phase change materials (PCMs) are widely used in a variety of forms and applications. That is, the latent heat material has a high density of heat storage of about 40 ~ 50 kcal / kg and is widely used in heat storage systems using solar heating and heating and midnight power.

However, most of these structures in the related art generally have a unidirectional cooling or heating type of heat storage characteristics or employ a forced cooling method using a cooling fan. In this case, the unidirectional cooling structure is a structure in which a latent heat storage material injected into a ball or a container is cooled through a heat exchanger to cool the latent heat storage material to accumulate cooling heat, or a hot water or steam heated using a boiler. It is a simple heat exchange type structure that can be heat-exchanged with latent heat storage material and used for the required time.

Recently, according to the trend of high integration, high performance, and miniaturization of semiconductor chips and packages including the same, communication equipment is rapidly becoming high performance. Accordingly, the performance of communication equipment is improved by quickly and efficiently dissipating heat generated therein when the communication equipment is operated. Various attempts have been actively made to keep it smooth, and this heat dissipation problem has become an important factor in the development of communication equipment.

Conventionally, the general structure for discharging the operating heat inside the communication equipment to the outside, in the case of a small communication equipment is an air-cooled structure equipped with a simple cooling fan structure therein, or in rare cases a small pump structure for the circulation of the cooling water. It has a water-cooled structure, and in the case of large communication equipment is operating with a cooling air conditioning system.

However, in the air-cooled cooling fan structure by forced ventilation, the life of the equipment is shortened by the intrusion and vibration of contaminated dust or harmful fine particles from the outside environment into the equipment, and energy costs are required to operate the cooling fan. In addition, noise is accompanied, so residential areas provide a cause for complaints due to noise. In addition, even in the water-cooled structure, in addition to the energy cost and noise problems described above, there is a problem that the cooling structure becomes complicated and there is a fear of freezing in winter. On the other hand, the installation of the cooling air conditioner system inside the device is expensive to install and maintain, complicated structure, requires a separate relatively large occupied space, and there is a problem of noise, small electronic communication There is a problem that is difficult to apply to the equipment.

Therefore, there has been a need in the art for a quiet natural cooling device without noise or vibration inevitably accompanied by a forced cooling method, and the conventional general natural cooling device proposed according to this request is a coolant circulation as shown in FIG. The natural cooling device 1 ', which adopts the system S', which is a main part of the system S ', is as shown in FIG.

This conventional system (S ') consists of a receptor (11') containing latent heat storage materials (PCMs) and a loop-shaped pipeline (24) penetrating the inside thereof in a transverse direction. The cooling principle is that the latent heat storage material inside the receptor 11 'absorbs heat generated by the heat generating element 3 of the electronic communication device, and then the heat absorbed inside the receptor 11' is absorbed. Is transferred to the coolant 25 in the pipeline 24, and the heated coolant 25 moves upward by the density difference, and the coolant 25 in the pipeline exposed to the outside is subjected to natural convection. By the cooling by means of the cyclic shift principle using the difference in density is moved to the inside of the above-mentioned receptor (11 ') containing the latent heat storage material.

However, such a conventional natural cooling system S 'focuses only on the fact that the latent heat storage material has a high latent heat amount, but uses only a function of mediating heat transfer between the heating element 3 and the cooling water 25, Despite the large amount of heat storage of the latent heat storage material 15 described above, due to the fact that a heat exchanger is used to transfer the heat absorbed by the latent heat storage material 15 from the heating element 3 to the cooling water 25 again. Due to the inferiority of the heat transfer efficiency has a problem that the cooling efficiency is bad, and the internal structure also has a complex disadvantage. In addition, since the accurate circulation head has to be calculated for smooth circulation of the coolant 25, the design is very difficult, and there is a problem in that, in winter, special care is required to prevent freezing of the coolant 25.

Accordingly, the first object of the present invention is to provide an efficient natural cooling device for a small communication device capable of extending the life of communication equipment by quiet and energy-free, low inflow of dust and harmful particles without noise and vibration, and less inflow of dust or harmful particles. It is for.

A second object of the present invention is to provide a natural cooling system including a natural cooling device according to the first object of the present invention, which can block the radiant heat of the sun and increase the cooling efficiency by the chimney effect. .

According to a preferred aspect of the present invention for achieving the first object of the present invention, an outer tube body having a plurality of cooling outer fins formed on its outer circumferential surface, and located in the outer tube body, A latent heat storage material comprising an inner tube having a cooling inner fin formed therein, a cooling core rod inserted into the inner tube, and a latent heat storage material injected into a space between the outer tube and the inner tube; And a receiving portion, and optionally, further comprising a cooling protrusion extending from at least one end of the latent heat storage material accommodating portion, the inner tube having a plurality of inner pins on its outer circumferential surface, and a cooling mandrel positioned therein. There is provided a natural chiller having a multiple cooling fin structure.

According to one preferred aspect of the present invention for achieving the second object of the present invention described above, the nature of the multiple cooling fin structure according to the above-described first aspect, which is arranged in series, in parallel, or in matrix form. A cooling device; A heating element in the electronic communication device located below the natural cooling device; And a radiant heat shield casing in which at least one cold air inlet formed on at least one side of the lower portion and at least one heat dissipation hole formed on at least one side of an upper upper surface thereof are formed: heat dissipated by the heating element described above The heat dissipation is absorbed by the latent heat storage material injected into the latent heat storage material receiving portion and then conducted to the protruding cooling portion through the mandrel, and the cold air flow from the outside is absorbed from the protruding cooling portion through the cold air inlet. A natural cooling system is provided that includes a natural cooling device of a multiple cooling fin structure released through.

1 is a state diagram showing a natural cooling device according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a schematic view showing a natural cooling system according to the present invention.

4 is a plan sectional view of the present invention cooling system.

5 is a graph showing the radiant heat absorption rate of various materials.

6 is a graph showing a natural cooling device according to the present invention in which a mandrel and a mandrel pin are installed, and a temperature change inside the natural cooling device in the case of omitting it.

7 is a schematic diagram of a conventional natural cooling system using a refrigerant.

8 is a cross-sectional view taken along the line B-B in FIG.

-Explanation of symbols for the main parts of the drawing-

1: Natural Chiller (Invention) 1 ': Natural Chiller (Prior Invention)

11: outer body 11 ': receptor 111: outer pin

12: inner tube 121: inner pin 122: through hole

13: heart stick 131: heart stick pin

14: heat dissipation rod 141: heat dissipation fin 142: heat dissipation body

143: heat sink fin

15: latent heat storage materials (PCMs)

2: case

21: cold air inlet 24: euro 23: heat dissipation port

24: pipeline 25: coolant

3: heating element

S: Natural Cooling System (Invention) S ': Natural Cooling System (Prior Invention)

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a state diagram showing a natural cooling device (1) having a multi-pin structure according to the present invention, Figure 2 is a cross-sectional view taken along the line AA of Figure 1, the natural cooling device (1) of the present invention is the inner and outer storage of latent heat storage material It consists of the tube bodies 11 and 12 and the heat dissipation rod 14 extended from the at least one end part of the tube bodies 11 and 12 as an optional structure.

The accommodating part of the latent heat storage material has a plurality of outer fins 11 spaced apart from each other at regular intervals on the outer circumferential surface thereof, and a plurality of inner fins 121 disposed on the outer circumferential surface of the outer tube 11. The inner tube 12 is spaced apart from each other at regular intervals, and optionally a plurality of inner pins (not shown) may be spaced apart from each other at regular intervals, and the inner tube ( 12) a cooling core rod 13 inserted into the outer circumferential surface and having a plurality of core rod pins 131 on the outer circumferential surface thereof, and a latent heat injected into the space portion between the outer tube 11 and the inner tube 12; It consists of a storage material (15).

The shape of the outer tube 11, the inner tube 12 and the core rod 13 may be formed in a variety of shapes, such as the cross section of a circle, square, rectangle, hexagon, octagon, which is optional in the present invention.

In the present invention, the term 'multi-pin structure' is defined as a structure having at least two types of different cooling fins, the outer fin 111 and the inner tube 12 formed on the outer tube 11 described above. The inner pin 121 is formed on the outer circumferential surface of the necessarily, but the inner pin (not shown) formed on the inner circumferential surface of the inner tube 12 and the core pin 131 formed on the outer circumferential surface of the mandrel 13 is optionally included. It means a structure that can be.

In the present invention, at least one through hole 122 may be formed between the outer tube 11 and the inner tube 12 to form a structure capable of flowing the latent heat storage material 15.

On the other hand, the material of the outer tube 11, the inner tube 12, the core rod 13, the outer pin 111, the inner pin 121, the core pin 131 may be any metal, but thermal conductivity It is preferred to use high copper or copper alloys, aluminum or aluminum alloys, and can be formed by various conventional conventional techniques such as extrusion, welding.

Examples of latent heat storage materials that can be preferably used in the present invention include n-paraffins, coconut oil, lauric acid having a melting temperature in the range of −5 to 1 S ° C. and a latent heat of 180 to 240 J / g. Na ₂ SO ₄ ㆍ SH ₂ O with melting temperature of 32 ℃ and latent heat of 176J / g, Na ₂ HPO _{4 with} melting temperature of 36 ℃ and latent heat of 281J / g ㆍ 12H ₂ O, melting temperature of 36.4 ℃ and latent heat of 155J / g of Zn (NO _{3) 2} and 6H ₂ O, the melting temperature is 48 ℃ and latent heat is 201J / g of Na ₂ S ₂ O ₃ and 5H ₂ O, the melting temperature is 50 ℃ and latent heat is 134J / g of NaCH ₃ COO.3H ₂ O, polyethylene glycol (PEG) S-50, or any suitable combination thereof may be added and mixed in the required amount, which is merely a design choice for a person skilled in the art and the present invention. Is not limited to the above example.

Examples of the latent heat storage material that can be particularly preferably applied in the present invention include a melting temperature of 25 to 50 ° C., a latent heat of 180 to 235 J / g, an n-paraffin content of 85 to 99% by weight, and a molar weight of 250 to N-paraffins in the range of 350 g / mol.

By using the characteristics of the latent heat storage material, a large amount of heat can be stored in a small volume, and the phase transition temperature can be adjusted over a relatively wide range for each material or a combination thereof, thereby efficiently absorbing heat under various set temperature conditions. You can do it.

The interval between the outer fin 111 as the cooling fin and the interval between the inner fin 121 may be selected according to the thermal conductivity of the latent heat storage material 15, in general, the latent heat storage material of the paraffin or fatty acid system ( In the case of using 15), although not restrictive in the present invention, an interval of about 3 to 5 mm is appropriate.

Next, the heat dissipation rod 14 (optionally, may be exposed to the outside of the electronic equipment case (not shown)) extending from one side or both sides of the outer tube 11, a plurality of outer peripheral surface The heat radiation rod 14 having a heat radiation fin 141 is further configured. In addition, it is optional, but the outer periphery of the heat dissipation rod 14 is added to surround the heat dissipation tube 142 to which a plurality of heat dissipation tube fins 143 are attached to maximize the contact area with the cold, so that the cooling efficiency can be increased more preferable. Do.

Since the heat dissipation rod 14, the heat dissipation body 142, and the material and the formation method of the components forming the fins 141 and 143 are the same as described above, the description thereof will be omitted. In addition, the shape (for example, linear form, loop form, etc.), length, etc. of the said heat radiation rod 14 are not restrictive and selective in this invention.

In addition, since the heat dissipation rod 14 is made of the same material as that of the core rod 13 as described above, the heat dissipation rod 14 is preferable because it can increase the thermal conductivity while reducing the manufacturing cost.

In addition, if necessary, even if any additional structure is added to the heat dissipation rod 14 as a means of increasing the surface area for increasing the contact area with cold air, this is only a design change and additional technical matters are not changed. It is obvious that the technical scope of the invention is not exceeded.

Figure 3 is a schematic diagram showing the natural cooling principle of the natural cooling system (S) according to the present invention, at least one natural cooling device (1) having a multi-pin structure according to the invention arranged in series, parallel, or matrix shape (Only one is shown in FIG. 3 for convenience of illustration), the heating element 3 (semiconductor package, etc.) in the electronic communication equipment located below the cooling apparatus 1, and at least one formed on at least one side of the lower part. One cold air inlet 21 and at least one heat dissipation port 23 formed on at least one side of the upper upper surface is formed of a radiation heat shield case (2).

Looking at the heat flow with reference to the cross-sectional view of Figure 4, the heat dissipated from the heating element (3) in the electronic communication equipment in the outer tube 11 of the natural cooling device (1) according to the present invention located above The heat absorbed by the latent heat storage material 15, and the heat absorbed by the latent heat storage material 15 is part of the through-hole through the inner passage 12 through the inner passage 12 and the other hole (122) The convection of the latent heat storage material 15 is passed to the cooling core rod (13), and then to the heat dissipation rod (14) extending from at least one side of the outer tube (11) to the outside. In addition, the latent heat storage material 15 has a high heat absorption rate, but the transfer efficiency is low, so that the inner and outer fins 111 and 121 are attached to the tubular bodies 11 and 12 to improve conductivity, and the transferred heat is a heat dissipation rod 14. It is air cooled by the downward relatively cold air stream.

On the other hand, the cold air flow is heated by the heat dissipation rod 14 is a hot air flow is discharged upward along the flow path 22 by the natural convection is to achieve a natural heat dissipation.

The radiant heat shield case 2 functions to block the natural cooling device 1 according to the present invention from being exposed to radiant heat caused by high temperature and solar heat in some cases and not being heated. In addition, the cold air flow inlet 21 for inlet of cold air is installed at any point in the lower portion of the radiant heat blocking case 2 of the electronic communication equipment so that the cooling heat can be circulated smoothly by the chimney effect. Cooling heat can form a rising air flow due to the chimney effect to take the heat of the heat dissipation rod 14 can be smoothly discharged to the outside air through the heat dissipation port (23). The vertical distance between the cold air flow inlet 21 and the heat dissipation rod 14 should be at least 30 cm to obtain a sufficient chimney effect.

Figure 4 is a graph showing the radiant heat absorption rate for a variety of materials, the material of the radiant heat shield case (2) of the electronic communication equipment is typically formed of aluminum, the heat transfer coefficient of aluminum is relatively low compared to other materials, heat transfer It is indicated that the heat dissipation efficiency can be further improved by coating the interior of the radiant heat shield case 2 with a material such as graphite having a large coefficient.

5 is a graph showing the temperature change inside the natural cooling device in the case of not using it as a contrast with the natural cooling device 1 according to the present invention in which the mandrel 13 and the mandrel pin 131 are installed. As the latent heat storage material, n-paraffin having a melting temperature of 41 ° C. was used, the outside air temperature was 32 ° C., and the heating power was 500 watts. In the graph, the curve indicated by A is a cooling temperature curve with time in the case of using the natural cooling device 1 according to the present invention, and the curve indicated by B represents a mandrel and a core in the cooling device 1 of the present invention. It is the same curve in the case where a core rod pin is omitted.

In the results shown in FIG. 5, in the case of A using the natural cooling device 1 according to the present invention, a rapid cooling effect is expressed and maintained constant at a temperature of about 45 ° C. after about 25 minutes, while B as a control In the case of, the cooling effect is inferior and after 20 minutes, it can be seen that there is a severe deviation in the very temperature range of 72 ~ 88 ℃.

As described above, according to the natural cooling device and the natural cooling system using the same according to the present invention, the life of the equipment is reduced by the intrusion and vibration of contaminated dust or harmful fine particles from the external environment by forced air into the equipment Not only does it have a problem, but it adopts a natural cooling method, so there is no energy cost, and it is essentially noiseless and vibration-free, so there is no source of complaints caused by the installation of relay communication equipment. Unlike its simple structure, easy design, and no cooling water 25, there is no fear of freezing during the winter, and the fin-resistant structure is adopted for efficient heat transfer from latent heat storage materials with poor thermal conductivity. Cooling efficiency and excellent latent heat storage material in the appropriate temperature range By blocking the radiant heat of the surrounding there is an advantage that can obtain a constant cooling effect without any influence of the ambient conditions such as outdoor air temperature.

Claims (9)

An outer tube having a plurality of cooling outer fins formed on an outer circumferential surface thereof, An inner tube located in the outer tube and having a plurality of cooling inner fins formed on an outer circumferential surface thereof; A cooling core rod inserted in the inner tube and Natural cooling apparatus of the multi-cooling fin structure using a latent heat storage material, characterized in that consisting of the latent heat storage material (Phase Change Marerials (PCMs)) that are injected into the space between the outer and inner tubes and the inner tube and the mandrel. The natural cooling of the multi-cooling fin structure of claim 1, wherein the latent heat storage material is extended from at least one end of the outer tube containing the latent heat storage material, and further comprises a heat dissipation rod having a plurality of heat dissipation fins on its outer circumferential surface. Device. The natural cooling device of claim 1 or 2, wherein a plurality of cooling core rod pins are further formed on the outer circumferential surface of the cooling core rod. The natural cooling apparatus of claim 1 or 2, wherein a plurality of through holes are further formed in the inner tube. The natural cooling apparatus of claim 1 or 2, wherein the latent heat storage material is a compound selected from the group consisting of n-paraffins, coconut oil and lauric acid. The natural cooling apparatus of claim 2, wherein the outer circumference of the heat dissipation rod is surrounded by a heat dissipation tube body having a plurality of heat dissipation tube fins attached thereto. The natural cooling device according to claim 1 or 2, wherein the natural cooling device is formed of copper, aluminum, or their respective alloy materials, and the separation distance between the inner pins and the outer pins is in the range of 3 to 5 mm. Natural chiller with multiple cooling fin structure. A natural cooling device of the multiple cooling fin structure according to claim 2 arranged in series, parallel, or matrix form; A heating element in the electronic communication device located below the natural cooling device; It consists of at least one cold air inlet formed on at least one side of the lower portion and the radiation shielding casing is formed at least one heat dissipation port formed on at least one side of the upper upper surface: The heat dissipated by the heating element is absorbed by the latent heat storage material injected into the latent heat storage material accommodating part of the natural cooling device, and then conducted to the protruding cooling part through the mandrel, and the cold air flow from the outside is introduced into the cold air flow inlet. Natural cooling system, characterized in that it comprises a natural cooling device of the multi-cooling fin structure is absorbed from the protruding cooling unit through the discharge hole. The natural cooling system of claim 8, wherein a vertical distance between the protruding cooling unit and the cold air inlet is at least 30 cm apart.