No abstract

Under high temperature condition, determination of phase transition temperature and combination of PCM layer with the other layers affect the thermal buffering properties of the protective clothing. In this paper, Body-clothing-environment temperature gradient was analyzed. Related data was obtained from the dressing experiments. After that, phase transition temperature range of the protective clothing was determined. Temperature and humidity of human skin and microclimate were tested respectively with different positions of PCM layer. Finally, the optimization layer configuration was suggested.

The research reported here examines heat buffering property changes of phase change materials used in textiles. In the study, six types of fabrics with different warmth retention rate catalogued in two groups were used to determine how warmth retention rate of fabric affect heat buffering time of PCM when fabric was wrapped around PCM pouches. It was found that the greater the warmth retention rate of the wrapped fabric, the longer the heat buffering time of the PCM pouch, we also found that the heat buffering time prolonged in direct proportion to the warmth retention rate in different manners for fabrics weaved by fibers that have different heat conductivity. Greater warmth retention rate and smaller fiber conductivity lead to greater increase of the heat buffering time of PCM pouches. The results in this research suggested a possibility about how to control heat buffering time of PCM-containing textiles.

In low temperature environment, the lack of a proper thermal protection can cause human body frostbite, or even cause death. In this paper, the computational method of theoretical relationship between the phase change materials content in protective clothing, protective time and the working environment temperature was proposed when took into account the comfort requirement of human bodies, clothing thermal properties and heat loss through clothing system. This theoretical model could be used to predict the relationship between the protective material content and the protection time of phase change protective clothing. Experimental results show good accordance with the theoretical prediction.

Abstract. In this paper, we use the variable fiber reinforced reaction injection molding process to produce different kinds of fiber reinforced polyurethane composite materials. We analyze the effects of different types of fibers on the mechanical properties of the composites, while the tensile strength and bending performance testing -displacement curves. The changes of the density and mechanical properties of the composites were analyzed by the analysis of the fiber content from 10% to 20%.Finally, according to the analysis, a fiber material is optimized.