Appropriate Passive Technology For Traditional Dwellings In Western Hunan,China

Western Hunan is a multi-ethnic area and its climate zone belongs to the hot summer and cold winter zone,in the process of the developing of traditional dwellings,the local residents have accumulated many appropriate technologies that modern architectural design can get lessons.However,the traditional dwellings have been largely demolished and abandoned in Western Hunan in recent years.The main reason for the survive of these houses facing the difficulties encountered in the reality is that the poor building performance,this situation leads to the uncomfortable indoor environment quality and deficient confidence for the traditionally structured dwellings.Therefore,it is imperative to discuss the appropriate technology from the perspective of local climate and indoor thermal comfort.This paper focus on the research of following aspects:First,field study was conducted to identify the environment status of dwellings in Western Hunan,as well as their external building envelope type.We found that some traditional appropriate technologies and the existing problems of dwellings in Western Hunan from the natural ventilation and changeable space,structure and construction,materials aspects.Second,an analysis of the thermal and wind environment of a typical traditional Yinzi dwelling in West Hunan was carried out by field study and indoor thermal test.This component aims to analysis its ecological design strategies and found its existing appropriate technologies.Then,Computational Fluid Dynamics(CFD)of the wind environment of some typical Yinzi dwellings was quantitatively compared to discuss the relationship between the size of patio and ventilation vent with the wind pressure ventilation,and the relationship between the size of patio and living room with the thermal pressure ventilation.Third,based on the thermal environment test results,this study calculated the predicted mean vote(PMV)linear fit and the acceptable temperature ranges of typicalTunkou dwelling.For the poor thermal performance of this Tunkou dwelling,this paper try to find some passive appropriate technologies using the local material and low cost passive technology for upgrading its building envelope and natural ventilation skills,those technologies also compared and optimized by the thermal simulation software.Finally,according to the thermal performance and ventilation performance results of the orthogonal experiments,a final optimum ventilation strategy is provided for the Yinzi dwellings,which can significantly promote the natural stack effect of Yinzi dwellings in summer,and a final comprehensive retrofitting strategy was optimized for the Tunkou dwellings to improve the thermal performance.After retrofitting,those passive strategies can increase by 1169 h acceptable temperature hours in one year and have a 5.8 years dynamic payout period of investment.