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围护结构的内表面温度是衡量围护结构热工质量的指标之一。为确定围护结构内表面会不会因结露而产生冷疑水,可以通过图解法、计算法确定。图1是根据在稳定传热条件下,平壁任何一层的热流量均相同的原理采用图解法求得的。例:某砖混结构外墙厚370毫米,室内抹2厘米厚白灰砂浆,室外抹2厘米厚水泥砂浆,已知室内气温t_n=18℃,室外气温t_w=-10℃,求围护结构内表面温度。
The internal surface temperature of the envelope structure is one of the indexes for measuring the thermal quality of the envelope structure. In order to determine whether the inner surface of the envelope structure will not produce cold water due to condensation, it can be determined by graphic methods and calculation methods. Figure 1 is based on the principle that the heat flux of any layer on a flat wall is the same under a stable heat transfer condition. Example: A brick-concrete structure with a wall thickness of 370 mm, an indoor wipe of 2 cm thick white-gray mortar, and an outdoor wipe of 2 cm thick cement mortar, known indoor air temperature t_n=18°C, outdoor air temperature t_w=−10°C, in the enclosing structure surface temperature.