水蒸気による放射エネルギーの吸収・放射を考慮した室内温熱環境解析 : 室内湿度が空間温度分布に与える影響(その2)

概要

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It is well known that water vapor and carbon dioxide in the air have several infrared bands where these gases absorb and emit radiative energy. Therefore the radiative heat absorbed by room moisture may not be neglected in the prediction of room air temperature. Glicksman and Chen(1998) carried out numerical analysis and showed that the effect of radiative heat absorbed by room air moisture should be considered in the prediction of temperature distribution in large enclosed spaces. In this paper the analysis method of the radiative energy absorbed by room moisture is shown and some examples simulated by this method are presented. (1) The numerical analysis with temperature of walls as a given boundary condition was carried out. The simulated results with 25%, 50%, 75% relative humidity were compared to the case with absolutely dry air and the impact of radiative heat absorbed by room moisture on air temperature was confirmed. The effect of moisture on air temperature was remarkable especially when the temperature difference between walls was large and the volume of space was big. (2) The interactive simulation of convective and radiative heat transfer was conducted with the moisture's effect on air temperature simultaneously. The results showed that the impact of the radiative heat absorbed by room moisture appeared not only in air temperature but in the surface temperatures of walls.
社団法人日本建築学会の論文
2001-09-30