DEVELOPMENT OF DIRECT CALORIMETER FOR THERMOPHYSIOLOGICAL ANALYSIS OF CLOTHING SUBJECT

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The aim of this study was to develop the direct calorimeter for thermophysiological analysis of clothing subject. The insulation of door part of the calorimeter was improved to enhance the sensitivity of heat flux sensors by using insulation materials in this year. A sensitivity of the calorimeter was calibrated with the rubber heater at water temperatures (Tw) and at ambient temperatures (Ta) of 22,28 and 34ﾟC,respectively. Mean of the sensitivity were 0.30,0.31 and 0.31 mV/W at Ta of 22,28 and 34ﾟC and were 0.31,0.30 and 0.30mv/W at Tw of 22,28 and 34ﾟC,respectively. Heat loss from the hand and forearm was measured by using the calorimeter at Ta of 22ﾟC and relative humidity of 45% in six healthy women subjects. Their mean hieght, weight and body surface area were 158cm, 50kg and 1.45m^2. The subjects wore one of the three different clothings shown in followings, type A ; T shirts, short pants, underwear, socks and sneakers, type B ; long sleeved training wear and type A clothing, type C ; working gloves and type B clothing, respectively. The heat loss from the hand and forearm was3.2,6.6 and 7.4 W in clothing type A,B and C,respectively. Increase in the heat loss was in relation to the increases of clothing weight and skin blood flow. These results show that the calorimeter developed in the study is useful for thermophysiological analysis of clothing subjects.