A COMPARISON OF THE HUMAN-BODY EXERGY BALANCE BETWEEN LOW-EXERGY RADIANT COOLING AND CONVENTIONAL CONVECTIVE COOLING

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  • 人体エクセルギー収支の採冷空間と冷房空間における比較
  • ジンタイ エクセルギー シュウシ ノ サイレイクウカン ト レイボウ クウカン ニ オケル ヒカク

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Abstract

Passive cooling strategies alone may not be able to provide sufficient comfortable indoor environment during summer seasons, especially in highly dense urban areas. In such a case, we have to take some "coolness" into the room space to remove the redundant heat that the passive cooling strategies cannot yet remove. The "coolness" would not need to be an excessive coolness available from low-temperature cooling source, but rather a moderate coolness available from high-temperature cooling source, once appropriate passive cooling strategies are imple-mented. We call such a system supplying moderate coolness "SAIREI" system. "SAIREI" system is an active system that can work in harmony with passive systems. To make clear the feature and the possibility of "SAIREI" system, we compared the human-body exergy balance in the three types of room spaces : one is the built environment designed with external "sudare" screen and a radiant cooling panel, through which moderately-cold water flows ; the second is a mechanically air-conditioned room without "sudare" screen ; and the third is a naturally-ventilated room without "sudare" screen. The ratio of radiant cool exergy to convective cool exergy was 6 to 1 in the room with a radiant panel while it was 2 to 1 in the mechanically air-conditioned room. The thermal sensations of the subjects in the room with a radiant cooling panel fluctuate less than those in the air-conditioned room. Radiant cooling with moderately cold water was found to work quite well.

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