Convective heat transfer from human body. (Part 2. Effect of fabric on heat transfer).

Convective heat transfer from the outer surface of a cylindrical heat source covered with a fabric was experimentally studied and the effect of fabrics on the transfer coefficient was examined analytically based on the results. It was found that, for fabrics less permeable to air, such as tweed or denim, the experimental and analytical methods used in this study were available; that the heat transfer coefficient was reduced by covering; and that the problem of heat transfer may be treated as if fabrics had smooth surfaces by supposing a hypothetical rest layer of air on the surface. It was also found that, for permeable fabrics as knitted fabrics, the apparent heat transfer was larger than that for less permeable ones, so that the analytical method must be improved.