Study on Thermal Resistance of Basement Exterior Wall in Hot Summer and Cold Winter Zone

Abstract

With the growing of high-rise building in hot summer and cold winter zone, dew retardation measures of building basement are becoming more and more important. The problem of dew retardation is appeared in some buildings, which built before the code of design standard for energy efficiency of public buildings putting into practice. With the implementation of the code of design standard for energy efficiency of public buildings, the problem of dew retardation is not appeared any more. But the regulations of limits for the thermal resistance of basement exterior wall in hot summer and cold winter zone are 1.2 m2 k/w, which did not find the relevant basis. In this paper, the inner surface temperature of basement exterior wall in Chengdu was studied by using numerical simulation program, energyplus, under given outside weather conditions in summer. After analyzing and comparing the calculated results, the basement exterior wall will be condensed despite the thermal resistance of basement exterior wall, which is inconsistent with the actual. After analyzing the results, there are three reasons. First, the underground soil temperature is missing, and the temperature provided by software is not accurate. Second, because the basement is connected outdoor through the underground garage entrance, the ventilation frequency is very difficult to determine. Third, the meteorological data is wrong.