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An apparatus for measuring an overall heat transfer coefficient may include an internal case provided using a heat insulation material and having an open upper portion, an external case configured to enclose outer sides excluding an upper portion of the internal case, and provided using a heat insul

An apparatus for measuring an overall heat transfer coefficient may include an internal case provided using a heat insulation material and having an open upper portion, an external case configured to enclose outer sides excluding an upper portion of the internal case, and provided using a heat insulation material, a temperature adjusting portion configured to adjust an internal temperature of the external case and an internal temperature of the internal case, and a blocking portion disposed in an upper portion of the internal case to seal the internal case, in which the blocking portion may be configured to implement various covering conditions through a combination of a covering material and a thermal screen.

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1. An apparatus for measuring an overall heat transfer coefficient of a covering material or a thermal screen, the apparatus comprising: an internal case provided using a heat insulation material and having an open upper portion;an external case configured to enclose outer sides excluding an upper p

1. An apparatus for measuring an overall heat transfer coefficient of a covering material or a thermal screen, the apparatus comprising: an internal case provided using a heat insulation material and having an open upper portion;an external case configured to enclose outer sides excluding an upper portion of the internal case, and provided using a heat insulation material;a temperature adjusting portion configured to adjust an internal temperature of the external case and an internal temperature of the internal case;a blocking portion disposed in an upper portion of the internal case to seal the internal case; anda cooling portion comprising an upper case configured to extend from an outer side of the external case, and comprising a side provided using a heat insulation material, and a cooler provided on the side of the upper case,wherein the blocking portion is configured to implement various covering conditions through a combination of the covering material and the thermal screen,the overall heat transfer coefficient is calculated by dividing an overall heat capacity by an area of the covering material or the thermal screen of the blocking portion, and a difference between the internal temperature of the internal case and an external temperature of an upper side of the internal case. 2. The apparatus of claim 1, wherein the temperature adjusting portion comprises: a first temperature adjusting element disposed in a space between the external case and the internal case; anda second temperature adjusting element disposed in the internal case,wherein the first temperature adjusting element and the second temperature adjusting element are configured to achieve thermal equilibrium between a temperature of the space between the internal case and the external case and the internal temperature of the internal case. 3. The apparatus of claim 1, wherein the cooler comprises: an upper cooler disposed on an upper side in the cooling portion; anda lower cooler disposed on a lower side in the cooling portion,wherein the lower cooler is disposed adjacent to an upper portion of the blocking portion to circulate air above the blocking portion, and an operation of the lower cooler is adjusted to implement a wind velocity. 4. The apparatus of claim 1, further comprising: a radiation cooling portion disposed on the cooling portion to cover an upper portion of the upper case,wherein a surface temperature of the radiation cooling portion is decreased to occur a loss of radiant heat, thereby implementing radiation cooling. 5. The apparatus of claim 1, wherein the covering material and the thermal screen are disposed to be spaced apart from each other in an upper portion of the internal case. 6. An apparatus for measuring an overall heat transfer coefficient of a covering material or a thermal screen, the apparatus comprising: an internal case provided using a heat insulation material, and having an open upper portion;a blocking portion disposed in an upper portion of the internal case to seal the internal case and comprising the covering material or the thermal material; anda cooling portion disposed on the blocking portion to circulate air above the blocking portion,wherein the overall heat transfer coefficient is calculated by dividing an overall heat capacity by an area of the covering material or the thermal screen of the blocking portion, and a difference between the internal temperature of the internal case and an external temperature of an upper side of the internal case, the cooling portion comprises: an upper case configured to extend from an outer side of the external case, and comprising a side provided using a heat insulation material; anda cooler provided on the side of the upper case,wherein operations of the cooler is controlled to adjust wind velocity conditions. 7. The apparatus of claim 6, further comprising: an external case provided using a heat insulation material, and configured to seal the internal case, the blocking portion, and the cooling portion. 8. The apparatus of claim 7, further comprising: a temperature adjusting portion,wherein the temperature adjusting portion comprises:a first temperature adjusting element disposed in a space between the external case and the internal case; anda second temperature adjusting element disposed in the internal case, andthe first temperature adjusting element and the second temperature adjusting element are configured to achieve thermal equilibrium between a temperature of the space between the internal case and the external case and an internal temperature of the internal case. 9. The apparatus of claim 6, further comprising: a radiation cooling portion provided on the internal case to seal the internal case,wherein a surface temperature of the radiation cooling portion is decreased to occur a loss of radiant heat, thereby implementing radiation cooling. 10. A method of measuring an overall heat transfer coefficient of a covering material or a thermal screen, the method comprising: providing an apparatus for measuring an overall heat transfer coefficient, the apparatus comprising an internal case provided using a heat insulation material and having an open upper portion, and an external case configured to enclose outer sides of the internal case;selecting a combination of the covering material and the thermal screen to be disposed in an upper portion of the internal case;achieving thermal equilibrium between a temperature of a space between the internal case and the external case and an internal temperature of the internal case;measuring the internal temperature of the internal case and an external temperature of an upper side of the internal case; andcalculating the overall heat transfer coefficient based on the measured values,wherein the overall heat transfer coefficient is calculated by dividing an overall heat capacity by an area of the covering material or the thermal screen, and a difference between the internal temperature of the internal case and the external temperature of the upper side of the internal case,the apparatus for measuring an overall heat transfer coefficient further comprises a cooling portion comprising an upper case configured to extend from an outer side of the external case, and comprising a side provided using a heat insulation material, and a cooler provided on the side of the upper case. 11. The method of claim 10, further comprising: implementing a wind velocity or radiation cooling,wherein the wind velocity is implemented by controlling an operation of the cooler,the radiation cooling is implemented by decreasing a surface temperature of a radiation cooling portion disposed on the cooling portion to occur a loss of radiant heat of the covering material or the thermal screen.