Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Simulation of Radiative Property Effects on Radiant Cooling of Opaque Surface

비 투과면 복사 냉각에 대한 복사 물성의 영향 예측

  • Byun, Ki-Hong (Dept. of Mechanical Robotics and Energy Engineering)
  • 변기홍 (동국대학교 기계로봇에너지공학과)
  • Published : 2009.12.30
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Abstract

The effects of surface radiative properties on the radiant cooling of opaque surfaces under clear sky condition are studied. Two types of surfaces, one gray and the other selective, are compared. For the nighttime cooling, black surface gives the lowest plate temperature and on the other hand the ideal selective surface gives the highest temperature. The reverse is true when there is an insolation. Equivalent radiative heat transfer coefficient of radiant cooling without convection is about $1{\sim}7\;W/m^2-K$ for the range of values studied. The surface with black within the $6{\sim}13\;{\mu}m$ band else zero emissivity could be regarded as a black surface for the nighttime radiant cooling purposes. However, lower band limit of $4\;{\mu}m$ is preferred to $6\;{\mu}m$ for small insolation situations.

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References

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