KR20200089998A - Thermal dissipation characteristics sensing device - Google Patents

Abstract

According to the present invention, an apparatus for measuring heat dissipation properties includes: a vacuum heat source chamber accommodating a heat source unit irradiating a light heat source; a convection chamber accommodating an air injection port for adjusting convection conditions; a transmission plate provided between the heat source chamber and the convection chamber that are connected in series; and a sensor unit measuring heat dissipation properties of a heat dissipation member disposed on the transmission plate. According to the present invention, the apparatus for measuring the heat dissipation properties can control convection conditions and a high-speed heat source, and measure the heat dissipation properties by being applied to various types of new materials.

Description

Heat dissipation characteristics measurement device {THERMAL DISSIPATION CHARACTERISTICS SENSING DEVICE}

The present invention relates to a device for measuring heat dissipation properties, and more particularly, to a heat dissipation property measurement device capable of controlling convection conditions and a high-speed heat source, and applicable to various types of new materials.

The utilization and purpose of the heat dissipation member (heat sink) attached to the electronic equipment, LED, and cooling/heating devices has been greatly diversified, while the recent integration of electronic devices, the increase in high-power equipment, and the emergence of wearable devices have led to different types of heat dissipation. The demand for materials is on the rise.

Among them, air-cooled heat-dissipating members (MCPCB, etc.) to heat-dissipating fins that maximize the convection area, heat-transfer pads that transfer heat to the case, micro-grooves formed on the surface, radiant heat-radiating materials using heat-dissipating paint or radiation film, thin film Various types of heat dissipation materials, including heat consumps of convection/radiation heat-radiating films, carbon/nano (fine) materials, and heat dissipation materials that have physical characteristics such as flexibility or are unique in methods of application such as coating, patterning, and surface treatment. Is being utilized.

In contrast, the method of measuring the heat dissipation property has no clear standard, so a method of measuring or relatively comparing the heat dissipation property on its own basis was mainly used. However, these metrics differ depending on the method or environment, and there is a problem that it is difficult to compare objectively. Furthermore, the method of experimentally measuring using individual measuring elements based on the theory of heat transfer has a problem that it is difficult to apply directly in the field of heat dissipation industry because a person with expert knowledge must measure precisely using very precise equipment.

In addition, since the conventional air-cooled heat dissipation measurement method mainly targets a flat plate, a fluid, and a heat sink, there is a structural difficulty in applying to a new material having various characteristics such as very thin or particle characteristics.

On the other hand, in addition to the method of obtaining the convection/radiation heat transfer coefficient or the amount of heat released, various methods of obtaining the thermal conductivity of the member have been utilized. As a typical method, measure the temperature difference between both ends of the sample using a hot disk, measure the thermal diffusion coefficient using a method such as LFA, and measure the temperature of the sample in contact with an actual hot plate or fluid heat source. Various indicators such as heat transfer coefficient, heat flux, thermal diffusion coefficient, thermal resistance, temperature of heat source and heat dissipation material can be obtained.

However, these measurement techniques also had difficulties in simulating convective environment, neglecting radiative heat radiation, or measuring errors due to material deformation and size (including inability to measure), and difficulty in controlling the measurement environment. (Heat diffusion) may be non-uniform, and in the case of a porous material, an error due to voids may occur, and the heat source may interfere with the properties of the heat sink due to the residual heat source.

In recent research literature on new material heat dissipation materials, various measurement methods for heat dissipation properties have been suggested, but in the case of fiber type heat dissipation materials, a single line is measured or in the case of particle type heat dissipation materials (graphene, carbon coating, etc.) It was evaluated as a measurement technique that does not consider the actual use environment. The characteristics in the actual use environment were mainly presented using the actual heat source (hot plate, IC chip, etc.) to provide the heat dissipation effect. However, since these results are difficult to make consistent comparison in various environments, research and development of objective measurement technology is required.

Republic of Korea Registered Patent Publication No. 10-1337225B1 (2013.11.29.

The present invention has been devised in view of the above-described technical requirements, and an object of the present invention is to provide a heat dissipation property measurement device capable of controlling convection conditions and high-speed heat sources, and applicable to various types of new materials.

A device for measuring heat dissipation according to the present invention for achieving the above object includes: a heat source chamber in a vacuum that accommodates a heat source unit irradiating a light source; A convection chamber accommodating an air jet for adjusting convection conditions; A transmission plate provided between the heat source chamber and the convection chamber connected in series; And a sensor unit measuring a heat dissipation characteristic of the heat dissipation member disposed on the transmission plate.

And, a metal or non-metallic medium disposed under the heat dissipation member; And a thermocouple that senses a temperature difference between the upper and lower surfaces of the medium and measures the heat flux during the temperature increase process.

In addition, the heat dissipation member and the heat insulating material disposed on the side of the medium to block heat transfer; may further include.

In addition, the lower surface of the medium may be formed with a light absorbing coating that promotes absorption of light, and the lower surface of the heat insulating material may have a light reflection coating that promotes reflection of light.

In addition, a vacuum chamber accommodated in the interior of the convection chamber and disposed on the medium and the heat dissipation member to radiate heat can be further included.

Further, the convection chamber further includes; a curved guide groove into which one end of the air injection hole is inserted, and the direction of air applied to the heat dissipation member changes by moving one end of the air injection hole along the curved guide groove. can do.

In addition, a lens unit disposed between the transmission plate and the heat source unit to control a moving direction of light generated from the heat source unit; may further include a.

In addition, the sensor unit may include at least one of a thermometer, a hygrometer, a thermal imaging camera, and a wind vane.

In addition, the convection chamber may further include; an air conditioning unit for adjusting air pressure and humidity in the chamber.

According to the apparatus for measuring heat dissipation according to the present invention, convection conditions and high-speed heat source control are possible, and heat dissipation characteristics can be measured by applying to various types of new materials.

1 is a schematic diagram of a device for measuring heat dissipation according to the present invention.
2 shows another embodiment of a device for measuring heat dissipation according to the present invention.
3 shows another embodiment of a device for measuring heat dissipation according to the present invention.
4 is an enlarged view of the internal configuration accommodated in the two chambers of the heat dissipation property measuring apparatus according to the present invention.
Figure 5 shows a first measurement method of the heat dissipation characteristics measuring device according to the present invention.
Figure 6 shows a second measurement method of the heat dissipation characteristics measuring device according to the present invention.
7 shows a configuration for performing heat flux measurement in the apparatus for measuring heat dissipation according to the present invention.
Figure 8 shows a coating method for improving the measurement reliability of the heat dissipation characteristics measuring device according to the present invention.
9A and 9B show an implementation example of the heat dissipation property measuring apparatus 100 according to the present invention.
10A to 10F are graphs showing various measurement values measured by the heat dissipation property measuring apparatus 100 according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and the general knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Although the first, second, etc. are used to describe various elements, components and/or sections, it goes without saying that these elements, components and/or sections are not limited by these terms. These terms are only used to distinguish one element, component or section from another element, component or section. Accordingly, it goes without saying that the first element, the first component or the first section mentioned below may be the second element, the second component or the second section within the technical spirit of the present invention.

The terminology used herein is for describing the embodiments and is not intended to limit the present invention. In the present specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, "comprises" and/or "made of" mentioned components, steps, operations, and/or elements are those of one or more other components, steps, operations, and/or elements. Presence or addition is not excluded.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings commonly understood by those skilled in the art to which the present invention pertains. Also, terms defined in the commonly used dictionary are not ideally or excessively interpreted unless specifically defined.

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

1 is a schematic diagram of an apparatus 100 for measuring heat dissipation according to the present invention. 1, the apparatus 100 for measuring heat dissipation according to the present invention includes a convection chamber 110 and a heat source chamber 120.

The convection chamber 110 is controlled so that proper radiant/convective heat transfer proceeds, and the heat source chamber 120 is controlled to minimize the influence of residual heat by the heat transfer medium.

The apparatus 100 for measuring heat dissipation according to the present invention can be thoroughly controlled by being separated into a convection chamber 110 and a heat source chamber 120. Specifically, the existing measurement system uses metal or air as a heat transfer medium, and since the heat remaining in the medium is continuously released, a constant amount of heat is supplied and a temperature distribution in a steady state can be obtained. It was very limited to be used in various conditions such as cooling/heating, repetitive heat load, and material having high thermal conductivity compared to the medium. On the other hand, since the heat dissipation property measuring apparatus 100 according to the present invention performs direct heating without a medium by irradiating a light heat source, it is possible to supply heat uniformly and accurately, and it is possible to control heat quickly by blocking the light heat source.

The heat source chamber 120 is preferably maintained in a vacuum state for accurate heat amount control. To this end, the heat source chamber 120 may be provided with a vacuum pump (reference numeral 125 in FIGS. 9A and 9B) to maintain a constant vacuum state.

The heat source chamber 120 includes a light heat source unit 160 for irradiating a light heat source, and the light heat source unit 160 may be embodied as a device capable of irradiating a light source of a laser or halogen lamp.

The convection chamber 110 may be embodied as a vacuum to measure the heat capacity or the like of the medium disposed on the lower surface of the heat dissipation member, but may not be a vacuum. The convection chamber 110 accommodates an air injection port 115 for controlling convection conditions. The simulation of convection conditions should be appropriately controlled such as convection intensity, convection direction, Reynolds number, temperature and humidity, and gas component ratio. The air injection port 115 is injected into the air compressor while the temperature and humidity of the injected air are controlled, and the pressure and air volume of the injected air compressor are adjusted by a regulator or the like to be injected through the air injection port 115.

The air injection port 115 is basically arranged to inject air toward the heat dissipation member. That is, the air injection port 115 is basically disposed in a direction perpendicular to the arrangement surface of the heat dissipation member.

One end of the air injection port 115 is provided to be movable along the circumferential guide hole (P). Accordingly, the angle between the injection direction of the air injection port 115 and the heat dissipation member may be changed. In a state vertically disposed with respect to the arrangement surface of the heat dissipation member, the air injection port 115 sends air in a direction perpendicular to the heat dissipation member, but when the air injection port 115 moves along the guide hole P, the heat dissipation member is disposed. Since the angle changes with respect to the surface, the air delivery angle to the heat radiating member changes.

The air injection port 115 transmits the air with the injection intensity, temperature, and humidity adjusted by a compressor, a regulator, etc. while adjusting the injection angle of the air.

As shown in FIG. 1, the convection chamber 110 and the heat source chamber 120 may have a hexahedral shape having an accommodation space therein, but may be formed in a different shape. The convection chamber 110 and the heat source chamber 120 are connected in series, and a transmission plate 170 is provided therebetween. That is, between the two chambers are blocked by the transmission plate 170. The transmissive plate 170 may be made of a material having a very high transmittance (eg, glass).

A heat dissipation material HS is disposed on the upper surface of the transmission plate 170. That is, the upper portion of the heat dissipation material (HS) belongs to the interior of the convection chamber 110 to simulate the convection condition, the lower portion of the transmission plate 170 is provided with a heat light source unit 160 for generating a heat light source heat source chamber It belongs to the interior of (120).

Meanwhile, the apparatus 100 for measuring heat dissipation according to the present invention may be provided with various sensor parts for measuring heat dissipation properties of the heat dissipation member HS disposed on the transmission plate 170, and sensing sensed by the sensor part An analysis unit (not shown) for analyzing information, a display (not shown) for displaying the analyzed information may be further included. The sensor unit may include at least one of a thermometer, a hygrometer, a thermal imaging camera, and a wind vane, and may include various sensing devices necessary for measuring heat dissipation characteristics.

2 shows another embodiment of the apparatus 100 for measuring heat dissipation properties according to the present invention, and FIG. 3 shows another embodiment of the apparatus 100 for measuring heat dissipation properties according to the present invention.

As illustrated in FIG. 2, in the heat dissipation property measuring apparatus 100 according to the present invention, the lens unit 150 is disposed between the transmission plate 170 and the heat source unit 160. The lens unit 150 has a function of guiding the moving direction of the light source generated and supplied by the heat source unit 160.

Meanwhile, as illustrated in FIG. 2, a thermal imaging camera 140 may be disposed on an upper surface of the convection chamber 110 (a surface facing the surface on which the heat radiating member HS is disposed). The thermal imaging camera 140 visually measures the temperature change of the parallel member HS to measure the heat dissipation property of the thermal member HS.

As shown in FIG. 3, the apparatus 100 for measuring heat dissipation according to the present invention may further include an air conditioning unit 130 for adjusting air pressure and humidity in the chamber on the sidewall of the convection chamber 110. The air conditioning unit 130 may be configured as a fan or an openable window for discharging internal air or introducing external air.

4 is an enlarged view of the internal configuration accommodated in two chambers of the apparatus 100 for measuring heat dissipation according to the present invention.

A hole H of a predetermined size is formed on an upper surface of the heat source chamber 120 (a surface adjacent to or in contact with the convection chamber 110), and a transmission plate 170 is disposed in the hole H. A heat dissipation member HS is disposed thereon, and heat dissipation characteristics can be found by measuring a temperature change caused by the light heat source generated in the heat source chamber 120 while controlling convection conditions of the convection chamber 110.

On the other hand, the heat dissipation member (HS) is mounted on the transmission plate 170, except for a certain area to be exposed is blocked with a heat insulating material (HI). The insulation material HI uses a cylindrical acrylic material to expose only a certain area to the atmosphere.

The apparatus 100 for measuring heat dissipation according to the present invention measures heat dissipation characteristics by directly applying heat to the heat dissipation member HS through the heat source 160 and heat dissipation characteristics by applying heat to the medium to which the heat dissipation member is attached. A method of measuring can be used.

FIG. 5 shows a method of measuring heat dissipation characteristics by directly applying heat to the heat dissipation member HS through the heat source unit 160, and FIG. 6 measures heat dissipation characteristics by applying heat to a medium to which the heat dissipation member is attached. Shows how.

As shown in FIG. 5, the heat dissipation member HS is directly placed on the transmission plate 170, and a heat insulating material HI is provided on the side (circumference) of the heat dissipation member HS. The heat dissipation member HS directly receives the light heat source supplied from the heat source unit 160 to change the temperature. At this time, since the heat insulating material HI surrounds the heat dissipation member HS, only the light source directly contacting the heat dissipation member HS is used to cause the temperature change of the heat dissipation member HS, so that more precise measurement is possible.

On the other hand, as shown in Figure 6, the heat dissipation member (HS) may be supplied with a light source in contact, adhesion or attached to the medium 185. More specifically, the medium 185 may be contacted, adhered, or attached to the lower surface (lower part) of the heat dissipation member HS. In addition, a heat insulating member HI may be disposed on the side surface (circumference) of the heat dissipation member HS and the medium 185 to block heat transfer.

The medium 185 may be a specimen (metal or non-metal) or the like with known physical properties. By using the target material (object) to be actually used by the heat dissipation member HS, which is the object of the heat dissipation characteristic measurement, various measurements can be made in a form similar to the actual use conditions.

Through the temperature measurement at both ends of the medium 185, it is possible to measure the heat flux during the heating process. In other words, it is possible to measure the heat flux by measuring the temperature change between the upper surface of the medium 185 in contact with the heat dissipation member HS and the lower surface of the medium 185 facing the heat source 160.

7 shows a configuration for performing heat flux measurement in the apparatus 100 for measuring heat dissipation according to the present invention. The apparatus 100 for measuring heat dissipation properties according to the present invention has a temperature difference (temperature change) between the top surface of the medium 185 in contact with the heat radiation member HS and the bottom surface of the medium 185 facing the heat source 160. It includes a thermocouple 180 connected to the upper surface of the 185 and the lower surface of the medium 185.

Since the thermal interface adhesion between the medium 185 and the heat dissipation member HS may affect the measurement result, it is preferable that the heat dissipation member HS is adhered in the same or similar manner to the type actually used. In addition, when the heat dissipation member HS is attached to the medium 185, it is preferable to form an adhesive interface having a thermal conductivity higher than that of each member.

8 shows a coating method for improving the measurement reliability of the heat dissipation property measuring device 100 according to the present invention. The lower surface of the medium 185 is made of a light absorbing coating (C1) so as to promote absorption of light and uniformly absorb light, and the lower surface of the heat insulating material (HI) has a light reflection coating (C2) that promotes reflection of light. It is preferably made.

Specifically, the lower surface of the medium 185 may be made of a carbon coating so that the medium 185 can efficiently absorb light. On the other hand, in the region other than the region where the medium 185 achieves light absorption (the region where the heat insulating material HI is located), light absorption can be reduced by performing surface polishing or coating with a reflective material. The blocking is to effectively prevent the medium 185 from changing in temperature only by heat supplied from the heat source unit 160 and transferring heat in other places.

On the other hand, the convection chamber 110 is also made of a vacuum, so that the heat capacity of the measurement object (the medium 185 and/or the heat dissipation member HS) can be measured. In order to measure the amount of radiant heat of the measurement object (the medium 185 and/or the heat-radiating member HS), the area except for the emission area is blocked with a reflector, and radiation is radiated only in a specific area. (185) and/or the heat capacity of the heat dissipation member (HS) can be measured. To this end, a vacuum chamber (not shown) that is accommodated inside the convection chamber 110 and is disposed on a measurement object (the medium 185 and/or the heat dissipation member HS) to radiate heat is achieved. have.

If the heat dissipation characteristics of the heat dissipation material (HS) can be confirmed by the medium 185, a measurement object (media 185 or heat dissipation member (HS) or heat dissipation attached on the medium 185) through a vacuum chamber (not shown) The heat capacity of the member HS can be checked. In order to calculate various physical properties by substituting the identified parameters necessary for heat transfer calculation, a vacuum is created through a vacuum chamber (not shown) to block energy flow. At this time, the interior of the vacuum chamber (not shown) is preferably plated with a material having a reflectivity to minimize the heat radiated by radiation. However, when only radiant heat is to be measured, in consideration of a view factor, a portion of the vacuum chamber (a certain area of the upper surface) radiates heat radiated from a certain area of the heat radiation member HS to the outside. It is preferably made of a material having a light transmittance so that.

9A and 9B show an implementation example of the heat dissipation property measuring apparatus 100 according to the present invention. As shown in Figure 9a, the heat dissipation characteristics measuring device 100 according to the present invention is composed of a convection chamber 110 and a heat source chamber 120, a vacuum for maintaining a vacuum state inside the heat source chamber 120 Pump 125 is disposed.

On the other hand, the inside of the convection chamber 110, the air injection port 115 for simulating convection conditions is installed, the air injection port 115 is fixed to one end is inserted into the curved (circular) guide groove, the air injection port ( As one end of 115) moves along the guide groove, the direction of air applied to the heat radiating member is changed.

In the simulation of convection conditions, the convection intensity, convection direction, Reynolds number, temperature and humidity, and gas component ratios should be appropriately controlled, and the heat dissipation characteristics measuring device 100 according to the present invention controls the temperature and humidity of the injected air. It is injected through the air compressor, and the pressure and air volume of the injected air compressor are adjusted by a regulator, etc., and then injected through the air injection port 115. The position of the air injection port 115 is adjustable at the top of the heat dissipation member, as shown in FIGS. 9A and 9B, and is configured to adjust a specific distance and a specific angle from the heat dissipation member. An air conditioning unit may be further included to prevent air injected from the air injection port 115 and contacting the heat dissipation member from affecting the measurement environment temperature. As described above, the air conditioning unit may be configured of a fan or a retractable window for discharging internal air or introducing external air.

The apparatus 100 for measuring heat dissipation according to the present invention can perform various measurements according to a measurement location, a sensor type, and a method of use, since the purpose of accurate irradiation, control, and measurement of heat is measured. The controller controlling the driving of the heat dissipation characteristic measuring device 100 according to the present invention applies a specific amount of heat for a specified period of time to measure a temperature change by measuring a change in temperature by measuring a temperature change by a specific amount of heat. How to measure the'temperature-specified' method, the method of measuring the maximum temperature/reach time in a steady state, the method of evaluating the deformation of the material and the temperature time series during repeated periodic heat loads, according to the convection conditions There are ways to measure changes, etc.

10A to 10F are graphs showing various measured values measured by the heat dissipation property measuring device 100 according to the present invention.

The convection model of the convection chamber 110 in the apparatus 100 for measuring heat dissipation properties according to the present invention has the following three models.

① Natural convection

② Forced Convection: Adjust wind speed, air volume, spray angle, temperature and humidity, and air composition

③ Vacuum: Measurement of heat absorption, specific heat, and radiant heat

On the other hand, in the heat dissipation characteristic measuring apparatus 100 according to the present invention, the following three control methods are examples of the temperature control method, and various other methods exist.

① Steady state: A constant amount of energy is continuously irradiated to reach an equilibrium state without temperature change. Subsequently, the characteristics are evaluated at the corresponding temperature or the cooling pattern is blocked to evaluate the cooling behavior.

② Temperature designation method (Temp): It measures the required time by irradiating a certain amount of energy from a specific low temperature to a specific high temperature. Subsequently, the characteristics are evaluated at the corresponding temperature or the cooling pattern is blocked to evaluate the cooling behavior.

③ Time designation method (Time): Measures the highest temperature by irradiating a certain energy for a certain time at a certain low temperature. Subsequently, the characteristics are evaluated at the corresponding temperature or the cooling pattern is blocked to evaluate the cooling behavior.

10A is a graph generated by dividing and measuring a model of the convection chamber 110 by dividing a temperature difference from a specific high temperature to a specific low temperature by a required time.

FIG. 10B is a graph measuring heat flux through the medium 185 by measuring both ends of the medium 185 having a clear thermal conductivity and structure through the thermocouple 180. At this time, the amount of conduction (heat transfer) calculated through heat flux is equal to the amount of heat released into the atmosphere.

10C is a graph measuring the calorific value. Since there is no temperature difference between the measurement object (medium 185 and/or heat dissipation member HS) during the cooling process, it is measured through the calculation formula of the amount of heat (Q=mCΔt), and the mass (m) is a measurable value, Δt is It can be obtained by considering changes in the internal temperature. The apparatus 100 for measuring heat dissipation according to the present invention can use an average temperature of an insulated surface and an exposed surface in the air because one surface is insulated. In addition, specific heat (C) can be calculated|required using other thermal property test methods.

10D and 10E are graphs in which the highest temperature is measured through a thermal equilibrium control method and a time-specified control method. Measure the highest temperature (equilibrium temperature in thermal equilibrium) reached when a certain amount of thermal energy is irradiated.

10F is a graph measuring the time to reach the high point through a temperature-specified control method. The time to reach the peak can also be measured by a steady state control method, and represents the elapse of time when a certain amount of thermal energy is continuously irradiated until a certain high temperature is reached.

According to the apparatus 100 for measuring heat dissipation according to the present invention, convection conditions and high-speed heat source control are possible, and heat dissipation characteristics can be measured by applying to various types of new materials.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. You will understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: heat dissipation characteristics measuring device
110: convection chamber
115: air nozzle
120: heat source chamber
130: air conditioning
140: thermal imaging camera
150: lens unit
160: heat source
170: transmissive part
180: thermocouple
185: medium
HS: Heat dissipation member
HI: Insulation

Claims (9)

A vacuum heat source chamber accommodating a heat source portion irradiating a light heat source;
A convection chamber accommodating an air jet for adjusting convection conditions;
A transmission plate provided between the heat source chamber and the convection chamber connected in series; And
A heat dissipation property measurement device comprising a; sensor unit for measuring the heat dissipation property of the heat dissipation member disposed on the transmission plate. According to claim 1,
A metal or non-metallic medium disposed under the heat dissipation member; And
A thermocouple measuring the heat flux during the temperature increase process by sensing the temperature difference between the upper and lower surfaces of the medium. According to claim 2,
A heat dissipation property measuring device further comprising; a heat insulating material disposed on side surfaces of the heat dissipation member and the medium to block heat transfer. According to claim 3,
The lower surface of the medium is made of a light-absorption coating that promotes absorption of light, and the lower surface of the heat insulating material is a heat dissipation property measuring device made of a light reflection coating that promotes reflection of light. According to claim 2,
It is accommodated in the interior of the convection chamber, a vacuum chamber that is disposed on the medium and the heat dissipation member to radiate heat is achieved; further comprising a heat dissipation property measuring device. According to claim 1,
The convection chamber further includes; a curved guide groove into which one end of the air injection hole is inserted, and heat dissipation in which the direction of air applied to the heat dissipation member changes by moving one end of the air injection hole along the curved guide groove Characteristic measuring device. According to claim 1,
And a lens unit disposed between the transmission plate and the heat source unit to control a moving direction of light generated from the heat source unit. According to claim 1,
The sensor unit is a heat radiation characteristic measuring device comprising at least one of a thermometer, a hygrometer, a thermal imaging camera and a wind vane. According to claim 1,
The convection chamber, the air conditioning unit for adjusting the air pressure and humidity in the chamber; further comprising a heat dissipation characteristics measuring device.

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