Study On The Optimization Design Of Summer Indoor Thermal Environment Of Rural Residential Buildings In Chuzhou Area

In the past few decades,China has successively implemented a series of rural construction development strategies such as"The Construction of New Socialist Countryside","The Construction of Beautiful Village",and"The Rural Revitalization Strategy".Today,the architectural appearance of China’s rural areas has taken on a completely new look and it must continue to move forward.However,with the recent development of rural housing,the indoor thermal environment that was not considered during the construction period have become more and more serious.especially in some southern areas with relatively hot summers.The overheated indoor environment has caused a series of health,energy,and environmental problems.Therefore,this paper takes rural houses in Chuzhou area as the research object,and conducts a deeper study on the indoor thermal environment in summer,which is mainly divided into 5 aspects to study.（1）From the perspectives of energy and climate,the current situation of rural housing construction,and the challenges faced by the indoor thermal environment in summer,the urgency and necessity to improve the summer indoor thermal environment of rural residential buildings are explained.It is found that the current research on rural residential thermal engineering is mainly concentrated on the three aspects of human thermal comfort,natural ventilation and energy consumption analysis.Based on the actual situation of the research objects in this paper,a technical route is proposed to improve the indoor air temperature in summer for the optimization goal.（2）The main factors affecting the indoor thermal environment,the mechanism of the objective parameters of the thermal environment affecting the thermal comfort of the human body,the adaptability of the human body to the thermal environment,and the relevant indicators for evaluating the indoor thermal environment are studied.Finally,the PMV evaluation model and the TSV evaluation model are compared.The combined method evaluates and analyzes the indoor thermal environment in Chuzhou area.（3）Based on an extensive survey of rural housing in Chuzhou area,the analysis concluded that there are four main types of residential districts in this area:scattered residential area,cluster residential area,block residential area,linear residential area.The objective factors that led to overheating of indoor environment are summarized,as well as a issued thermal environment questionnaire.The results of the questionnaire showed that the local residentials have low satisfaction with the indoor thermal environment in summer,and corresponding design and optimization are needed.According to the results of the questionnaire,the linear regression equations of PMV and MTSV are further derived:(1=0.4269-11.343、(1=0.3539-9.7509,the predicted thermal neutral temperature is 26.6℃,the actual expected temperature is 27.6℃,and the thermal comfort interval is predicted It is 24.2℃～28.9℃,and the actual thermal comfort zone is 24.7℃～30.4℃;（4）The townhouses and single-family houses were selected to conduct field tests with objective parameters.According to the analysis of temperature,humidity,wall temperature,and indoor and outdoor air velocity changes,the following conclusions were obtained.The indoor air temperature value throughout the day is,the third floor>the second floor>the first floor,and the indoor temperature at night is higher than the outdoor temperature;the relative air humidity value is,the first floor>the second floor>the third floor;the quiet wind rate at night in this area is higher;the townhouse is better than the independent the building type;the house with the corridor structure can play a better shading effect on the outer wall.The wall temperature of each space at night of a representative single-family house is selected,and the main enclosure structures that affect the indoor air temperature at night are obtained through the method of principal component regression analysis:roof,southern wall and western wall;（5）Based on the results of research and actual measurement analysis,the optimization strategies of residential orientation,balcony depth,external wall insulation,and roof insulation were proposed,and single-factor optimization was carried out using Ecotect simulation analysis software to obtain the best single-factor Value:The best orientation of the residence is 162.5°,that is,17.5°from the south to the east;the best depth of the balcony is 1.2m;the best thickness of the external wall EPS insulation board is 30mm;the best thickness of the roof XPS insulation board is 20mm.Based on the single-factor optimization results,the optimization simulation verification under all-factor working conditions is carried out.The optimization results show that the optimization scheme can alleviate the problems of large indoor temperature changes throughout the day and high indoor temperature at night to a certain extent,and have accomplished the expected optimization effect.