Abstract
Abstract : The effect of gases having different thermal conductivities on the thermal insulation of handgear was investigated. Experimental mittens with special plastic spacer interliners of various thicknesses were sealed between gas impermeable outer and inner shells and filled first with room air (as control), then various experimental gases, and thermal insulation measured on a copper hand. Experimental gases included carbon dioxide, Freon-12, and helium. Comparative results are presented in terms of percentage insulation change; clo per inch; conductivity (K) values; and the measured thermal insulation (clo) values. Before all tests each mitten was evacuated (13 cm Hg) to remove all entrapped air, then filled without contamination with the control, or experimental gas. Gas within the handgear was maintained at a constant positive pressure (7.6 mm water) throughout each experiment. Mean measurements showed significant increases (13-32%) of thermal insulation for Freon-12 and carbon dioxide, with decreased insulation observed with helium. Significance and some practical application of these results for protective clothing design are shown.
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