Experiments on thermal environmental design of ceiling radiant cooling for supine human subjects

This study aims to clarify the control conditions of ceiling radiant cooling systems for human subjects in a supine position. The results will be useful for the design of hospital rooms and bedrooms. Five subjects cooperated in these experiments. The subject put on bedroom attire typical of hospital patients. In total, 28 experiments were performed under various conditions. When SET* and PMV were calculated, mean radiant temperatures evaluated from the radiative heat transfer between the inside surfaces of walls, a floor and a ceiling, and the surfaces of a rectangular model of a human body were applied. As a result, it was clarified that SET* and PMV that gave comfortable thermal conditions were around 27.0°C and around 0.25°C, respectively, in these experimental conditions. On the other hand, reduction of skin temperature on exposed parts such as the instep reduced the favorable impression. However, there was no clear relationship between radiative sensation and favorable impression.