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采用稳态热箱实验法,对采用岩棉作为保温材料的金属面夹芯轻质绝热围护结构进行传热传湿实验,研究蒸汽渗透对其热工性能的影响。通过对典型构造试件在稳定传热状态下的温度、湿度和热流的测量和分析,得到了不同蒸汽渗透情况下保温材料层的热湿分布,比较了5种工况下试件热流的差别,分析了传热系数与湿度的关系。结果表明,蒸汽渗透可导致围护结构传热量增大很多倍,围护结构传热系数与保温材料平均湿度呈指数关系。
The steady-state hot box experiment was used to study the heat and moisture transfer experiments of the metal-clad lightweight thermal insulation envelope with rock wool as the thermal insulation material. The effects of steam infiltration on the thermal performance were studied. Through the measurement and analysis of the temperature, humidity and heat flow of the typical structure specimen in the steady heat transfer condition, the heat and moisture distribution of the insulation material layer under different steam infiltration conditions is obtained. The difference of the heat flow of the specimen in the five conditions is compared , The relationship between heat transfer coefficient and humidity was analyzed. The results show that steam infiltration can cause the heat transfer of the envelope to increase by many times. The heat transfer coefficient of the envelope and the average humidity of the insulation material are exponential.