关键词: 气凝胶, 消防救援服, 隔热内衬, 热阻计算, 数值模拟

Abstract:

In order to improve thermal comfort performance of fire rescue suits in high temperature environment, theoretical formula derivation and calculation of thermal resistance of fire rescue clothing lining were studied, and relationship among particle size, thermal conductivity, filling angle and thermal resistance was deduced. Then, a three-dimensional model was made by using matlab to show the relationship between thermal resistance and the three. The results show that when particle size is smaller, filling angle and thermal conductivity were smaller, the thermal resistance will be greater. When the size is at a fixed value, isothermal resistance curve presents a parabolic trend. As filling angle increases, total thermal resistance Rdecreases first and then increases, but when it is fixed, the resistance curve is approximately a monotonic decreasing oblique line, and total thermal resistance decreases linearly with the increase of particle size and thermal conductivity. What is more, the thermal conductivity is constant, the isotherm is approximately a left hyperbola, and it has the largest particle size at a filling angle of about 0.92.

Key words: aerogel, fire-fighting and rescue clothing, insulation lining, thermal resistance calculation, numerical simulation