Abstract
The net thermal radiation of hot water panel was measured in accordance with the new measurement method using the radiant illumination meter, developed by Heating Machinery Society of Japan in 1987. The main results are shown as follows : (1) The ratio of radiation to total output of single panel and double panel are 20〜30% and 11〜14%, respectively, regardless of temperature difference between room air and hot water in panel. (2) the measured values are 0〜20% greater than predicted values of thermal radiation based on Hottel's radiant theorem.
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