Research On Energy Saving Reconstruction Design Of Rural Residential Roof Based On The Perspective Of Thermal Comfort In Winter

In recent years,with the implementation of the Rural Revitalization policy,the economic income and living standard of rural residents have been significantly improved;meanwhile,the comfort requirements of rural residents for the indoor environment of buildings are constantly improved.Therefore,the energy consumption of residential buildings for improving the indoor environment is increasing,but the thermal performance of rural building envelope is often poor,which leads to huge energy waste.Unlike urban residential building,the roof of rural residential building occupies a large proportion in the building envelope because of the low height.As the top envelope of building,the roof should have good load-carrying capacity and good thermal performance.Because the roof is located in a special location,a large amount of heat will enter into and exit from the building through the roof,which results in the high indoor temperature in summer and low indoor temperature in winter.Therefore,for rural residential buildings,improving the thermal performance of the roof can reduce the energy consumption needed to create a comfortable indoor thermal environment.This paper takes the roof of rural residential buildings in Yuncheng of Shandong Province as the research object,and studies the influence of the thermal performance improvement of the roof on the indoor thermal environment and energy conservation in winter,by using the methods of theoretical analysis,questionnaire survey,field measurement and simulation analysis.This paper first reviews and summarizes the research on energy saving reform and thermal comfort of buildings at home and abroad.Based on the theory of thermal comfort,this paper explores the improvement effect of rural residential roof energy saving reform on building energy consumption and indoor thermal environment in winter.Secondly,through the investigation,the common methods and common materials of rural residential roof are summarized,the indoor and outdoor temperature and humidity of winter buildings are measured on site,as well as the indoor black globe temperature and wind speed.Meanwhile,the questionnaire survey is conducted.The subjective feeling and heat adaptation mode of residents’ thermal comfort are investigated,and the comfort temperature range of rural residents in winter is analyzed.Thirdly,the representative buildings are selected,and the existing buildings are simulated by using Ladybug + Honeybee parametric simulation plug-in in Rhinoceros 6modeling software.The energy consumption,the gain and loss of the enclosure structure,the surface temperature,the indoor temperature distribution and the indoor thermal comfort in winter are obtained,and the influence of the roof on the indoor comfort in winter is analyzed.Combined with the current energy saving requirements and construction methods of residential enclosure structure,and the roof construction practice of the selected case of the rural residential buildings,the roof energy-saving reform scheme suitable for rural areas is selected.Finally,the simulation software is used to obtain the optimal extent of different roof renovation schemes which are used in energy consumption,roof gain and loss heat and surface temperature,indoor temperature distribution and comfort in winter.Through the comparison and analysis of the optimization effect of different roof renovation schemes,and combining with the comfort temperature range of the local residents in the heat adaptation mode,the paper analyzes the impact of energy-saving renovation on the indoor comfort of the building in winter.Through the research and demonstration of this paper,combined with the heat adaptation mode,comfortable temperature range,existing roof construction methods and energy saving demand of local residents,the optimization scheme of building roof in different ages is proposed.Through the simulation analysis,the most suitable energy saving renovation scheme is obtained,which provides a certain selection basis for the roof of new and reconstructed rural residential in local and similar climate conditions.