The effect of air permeability and radiation property on free convective heat transfer of clothing system

Convective heat transfer coefficients of the vertical hot plate with the clothing material placed parallel to it, when there was no forced flow in surroundings, were measured. The effect of air penetration both through the permeable clothing material and through the bottom of air space was studied. The effect of radiation property of the clothing material was also examined. The effect of penetration on heat transfer through the material was smaller than those through the bottom of the space when there was no forced flow in surroundings. Radiation effect of the material on heat transfer was about 30±5% for every height and size of air space when the bottom was closed, while when the bottom was open, radiation effect was much less than those of closed condition when space was 5 or 10mm. It was probably because of convection in air space of clothing.