基于PCM改善帐篷围护结构热工性能的有效性

Effectiveness of improving tent envelope thermal performance based on PCM

由于空气渗透、热辐射吸收和薄的厚度,帐篷围护结构所具有的低热惰性和热阻已成为导致其内部热环境恶劣的重要原因。为了改善帐篷围护结构的热工性能,提出了复合结构并应用于帐篷中,具体包括外部织物层、相变层和内部织物层。同时,建立了复合结构的传热模型并进行了验证。此外,针对成都气候条件且在不同相变材料热导率、相变潜热、比热容、相变温度的影响下,结合数值模拟方法评估了复合结构的热工性能以及确定了相变材料改善复合结构热工性能的有效性。

Owing to effect of air permeability,thermal radiation adsorption and thin thickness,low thermal inertia and resistance of tent envelope become one fundamental reason causing poor indoor thermal environment of tent.For the sake of improving thermal performance of tent envelope,composite structure was proposed and applied in tent,including outer fabric layer,phase change material(PCM)layer and inner fabric layer.Meanwhile,the heat transfer model of this new type structure was established and verified.In addition,for the climatic conditions of Chengdu in China,the thermal performance of composite structure was evaluated and effectiveness of improving tent envelope thermal performance based on PCM was determined with the aid of numerical simulation under the influence of different PCM thermophysical properties,containing PCM thermal conductivity coefficient,latent heat,specific heat capacity and phase-transition temperature.