Study On The Indoor Thermal Environment And Passive Energy-saving Technology Of Rural Residential Houses In The HSCW Zone Of China

Despite their high energy consumption,rural residential houses in the hot summer and cold winter zone still have a generally poor indoor thermal environment.The objectives of this study were to understand the current status of the indoor thermal environment for rural residential houses in the hot summer and cold winter zone and analyze its cause in order to develop some strategies for improvement through passive design of the building envelope.In this study,we investigated rural residential houses in the hot summer and cold winter zone through face-to-face interviews and field measurement After a detailed analysis of the general situation of the building envelope,residents’ lifestyle,air tightness,indoor thermal environment and energy consumption of rural residential houses in the hot summer and cold winter zone,it was found that the thermal performance of rural residential houses in hot summer and cold winter zone is very poor,and wooden roof gaps,window frame gaps,and air conditioning holes are very common.The indoor thermal environment is far away from the comfort zone,and the problems of high temperature and high humidity in summer and low temperature and high humidity in winter are very serious.Besides,Rural residential houses in hot summer and cold winter zone zone have high energy consumption costs.The average household electricity fee reaches 139.2 CNY/month,about about 2.5 times the electricity cost of rural households in China.Then,some passive design strategies were simulated,including the application of functional interior materials such as hygroscopic and phase change materials.It is found that increasing the thickness and position of CMPCM-15 has a regulation effect on the indoor thermal environment and saves energy.An overall passive design for the building envelope can increase the room temperature by 3.6℃,reduce the indoor relative humidity by 12%in the winter,and reduce the room temperature by 4.4℃ in the summer.In addition,the annual energy-saving rate of building envelope and the carbon emission reduction rate can reach about 35%.