Effects of natural solar radiation on manikin heat exchange

• The main objective was to compare short wave radiation from Thorn lamp to solar radiation. In sun all manikin front zones get more or less evenly radiated but in the lab the radiated power reaches some zones more than others. Tests were carried out on the thermal manikin Tore under clear sky in a building corner facing the sun. The manikin was turned so that in the end of each trial the sun faced manikin front. Basic tests without radiation were carried out in homogenous conditions in the climatic chamber. 4 sets of clothing were tested: black Nomex (BN), orange Nomex (ON), white cotton (WC) and reflective Nomex (RN). Helly-Hansen underwear (super stretch, polypropylene) was used under all coveralls. Thermocouples were fixed at chest on underwear inner and outer surfaces and outer layer inner and outer surfaces for textile surface temperature measurements. From basic tests there were estimated the heat losses for particular outdoor conditions. The insulation values were corrected for air velocity according to EN 342 (2004). The difference between the calculated heat losses and actual measured heat losses outdoors gave heat gain from sun for those particular conditions. There was a clear difference between BN and the other suits and RN and the other suits, however, ON and WC were quite similar. The highest textile temperatures were recorded for BN and lowest for RN. A difference between ON and WC was present, too. The curves followed the same pattern as observed from the manikin tests with solar lamps in the climatic chambers: underwear had often the highest temperatures.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Produktionsteknik, arbetsvetenskap och ergonomi (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Production Engineering, Human Work Science and Ergonomics (hsv//eng)

Nyckelord

solar radiation

manikin

heat exchange

clothing

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