Effects of Exterior Sun Shades on Heat Transfer by Solar Radiation

Abstract

Heat transfer in walls, as affected by climatic conditions such as fluctuations in outside air temperature, solar radiation intensity and wind speed as well as wall structures and heat transfer coefficients of materials, becomes a complex and non-steady state. The aim of this paper is to examine the relationship between total whole-day solar radiation and heat absorbed by and released from materials. An reduced scale of experiment was conducted using reduced scale precast concrete slabs and focusing on the effect of heat transfer involving solar radiation, building materials and shading rate. The results show that even though the sun shadings would stem partly the solar radiation into the wall, yet they obstruct in the mean time the release of the heat, which absorbed hours ago. That leads to a temperature raise and uncomfort to the interiors.

Effect of Solar Radiation to the Building Materials Properties: A Review

“…Concrete creep are accumulated by frequent temperature rise due to solar radiation when the concrete is not exposed to rain. Huang and Tsai [5] studied on effects of exterior sunshades on heat transfer by solar radiation. Huang and Tsai [5] separated the effect of solar radiation into two concrete specimens which one specimen with covered sun shading net and other without sun shading net.…”

“…Huang and Tsai [5] studied on effects of exterior sunshades on heat transfer by solar radiation. Huang and Tsai [5] separated the effect of solar radiation into two concrete specimens which one specimen with covered sun shading net and other without sun shading net. The specimens were exposed outside with actual solar heat radiation.…”