Effects of Space Geometry, Season and Weather Condition on Different Components of Outdoor Thermal Radiation
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Thermal radiation is an important component of outdoor thermal environment since it accounts for a significant part of thermal load on human body. This study investigated the radiation fields in two outdoor spaces with different Sky View Factors (SVFs) in summer and autumn, and under sunny and overcast weather conditions. The result shows that the decrease of SVF significantly reduced the short-wave radiation due to the block of the sun. In contrast, the change in SVF had a much smaller impact on the level of long-wave radiation. The total level of radiation among seasons had a huge difference, as the difference in the Tmrt among seasons exceeded 30 °C. Weather condition had a smaller impact on the total level of radiation than season, as the Tmrt on a sunny day was only about 10 °C higher than that on an overcast day. The findings of this study provide a database for studying the radiation field and thermal comfort in outdoor spaces.
KeywordsOutdoor thermal comfort Outdoor radiation Outdoor thermal environment Sky view factor
This research is financially supported by the National Natural Science Foundation of China (No. 51708400).
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