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在当前的建筑节能研究中,有人提出了用“经济热阻”取代“低限热阻”的设想,本文拟结合我国高寒地区的实际情况,探讨从理论上确定围护结构经济热阻的可能性。一、围护结构的低限热阻在现行的建筑热工计算中,围护结构低限热阻是按下式确定的: R_0~d=(t_n-t_w)/(△t_y)·R_n·n·A (1)根据低限热阻计算的保温层厚度是: δ_0~d=λ(R_0~d-R’) (2) 从(1)、(2)两式可以看到,确定低限热阻的关键是△t_y值,亦即冬季室内计算温度与围护结构内表面温度的允许温差。在采暖房屋中,实际温差小于或等于△t_y,即可避免墙体对人体产生强烈的冷辐射,防止外墙内表面结露,满足卫生和使用要
In the current research on building energy efficiency, some people put forward the idea of replacing the “low limit thermal resistance” with “economic thermal resistance”. This paper intends to explore the possibility of theoretically determining the economic thermal resistance of the building envelope in combination with the actual conditions in China’s alpine regions. Sex. First, the lower limit thermal resistance of envelope structure In the current calculation of building thermal engineering, the lower limit thermal resistance of envelope is determined by the following formula: R_0~d=(t_n-t_w)/(△t_y)·R_n· n·A (1) The thickness of the insulating layer calculated based on the lower limit thermal resistance is: δ_0~d=λ(R_0~d-R’) (2) As can be seen from the equations (1) and (2), the determination is low. The key to limiting the thermal resistance is the value of Δt_y, which is the allowable temperature difference between the indoor temperature in the winter and the internal surface temperature of the envelope. In a heating house, the actual temperature difference is less than or equal to △t_y, which can prevent the wall from generating strong cold radiation on the human body, prevent condensation on the inner surface of the outer wall, and meet the requirements of hygiene and use.