The Effective Thermal Resistance of Fibrous Layers in Sleeping Bags

Abstract

This paper describes a simple method for evaluating the thermal insulation capacity of fibrous layers in sleeping bags. Our measurements have kept the thickness layer at 75per cent of the thickness when the sleeping bag is in free state. Thus, the expansion (volumetric)characteristics of the tested fibrous layers are respected, resulting in a more objective evaluation and comparison of the tested layers. The results were recalculated to the same square mass of layers. It was found that various layers differ substantively from one another, and that these first results also differ from those achieved under common testing procedures, where the tested layers are subjected to constant pressure between two plates of different temperature.