严寒地区被动房外墙传热系数

为了研究适用于我国严寒地区气候条件的被动房外墙传热系数，从我国严寒地区与德国气候条件的差异性入手，通过ISO和DIN等国际标准对4种不同环境下的外墙内表面热阻、热桥和发霉温度点等方面的理论进行全面介绍并分析. 运用Heat2热桥软件，计算德国被动房外墙设计标准使用在我国严寒地区气候条件时的外墙室内墙角温度. 将计算出的墙角温度与5种不同室内相对湿度环境下的发霉温度点进行对比分析. 计算结果表明，当内墙表面热阻为0.5和1.00（m²·K）/W时，墙角温度都低于发霉温度点以下. 基于我国气候条件，以发霉温度点为基准反向推导出5种不同室内相对湿度环境下的外墙传热系数，提出室内相对湿度为50%时的传热系数为适用于我国严寒地区被动房建筑的外墙传热系数.

Heat transfer coefficient of passive house exterior wall in cold area

Starting from the differences of climatic conditions between China and Germany, the theories of thermal resistance, thermal bridge and mildewing temperature of exterior walls in four different environments were comprehensively introduced and analyzed by ISO and DIN International standards in order to analyze the heat transfer coefficients of passive exterior walls suitable for the climatic conditions in cold regions of China. Heat2 thermal bridge software was used to calculate the indoor corner temperature of the exterior wall of passive house when the German design standard for exterior wall of passive house was used in the climatic conditions of severe cold regions in China. The calculated wall corner temperature was compared with five mildew temperature points in different indoor relative humidity environments. Results showed that when the thermal resistance of the inner wall surface was 0.5 and 1.00 (m²·K)/W, the corner temperature was below the mildew temperature point. The heat transfer coefficients of the external walls under five different indoor relative humidity environments were deduced by using the mildew temperature point as the benchmark based on the climatic conditions in China. The heat transfer coefficients at 50% indoor relative humidity are the heat transfer coefficients of the external walls suitable for passive buildings in cold regions of China.