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The purpose of this paper 重 s to evaluate the influence of asymmetric and uneven thermal radia ・ tion field upon the hum 尹 n body， Experiments were conducted under the fol ！ owing conditions ． Ten young male subjects in sedentary nude posture were exposed to eithteen kinds of thermal radiation field ， The 出 ermal radiation field ' was set to Ieft ・ right side symmetry and left − right side asymmetry with the aim of ℃ onstaht operative temperature． It was found the foliowing ：The infLu ． ence of asymmetric thermal radiation field between left side 4nd right side was ' observed ． In asym − metric radiation condition thermal and comf ♀ rt sensations fluctuate over ， the wide range in contrast with symme ric condition ， However ， 'the general tendency the influerice of 』 asymmetric thermal radiation field upon subjective sensation was not evident from data of the tast 10 minutes ． In con − trast， skin temperature difference between right and left sides corresponds to direc し ； onal areq op − erative temperature difference between both sides ． It is necessary to reconsider usual operative temperature that has been used when there are asymmetric thermal radiatien field ． It would be more suitable to deal with the usual operative temperature in every pres と nce of asymmetric ther ． mal radiation and relation between air temperat肛 e and mean radiant temperature． 、 ．

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