Study On Influencing Factors Of Energy Consumption And Indoor Comfort Of Existing Residential Buildings In Cold Area

In recent years,with the rapid development of low-carbon recycling economy and the construction of resource-saving society,energy-saving renovation has became a key research topic.Besides,the global warming and the urban heat island also make the study of residential indoor thermal environment very imperative.The comfortable indoor thermal environment not only can improve health,but also raise work efficiency.Therefore,many scholars are investigating the energy consumption and indoor thermal comfort of existing buildings.In this dissertation,we first did a review on the energy-saving and indoor thermal comfort including the evaluation of existing domestic and foreign research literatures.Then,taking the existing residences of different ages in Dalian in the cold region as the example,we investigated the status and simulated the performance of the existing residences.Besides,the differences between energy consumption and indoor thermal comfort before and after renovation were also explored,and those factors affecting the differences were analyzed.Finally,we found the suitable transformation strategies for enclosure structures of existing residential buildings in cold region to achieve the goal of higher comfort and lower energy consumption.The main research contents are as follows:(1)The software SPSS was used to conduct regression analysis on the survey data to obtain indoor thermal comfortable temperature range in summer and winter in Dalian,then we introduced a new thermal comfort index-thermal comfort rate(TCR),which can describe the thermal comfort of existing residential buildings quantitatively,and explained its algorithm.(2)A real-life analysis was conducted on the planning layout,the building envelope and the internal space of the existing residential buildings in different ages.After that,the performance simulation was performed with Phoenics software,and the reasons for the differences in the indoor and outdoor wind environment of existing residential buildings were analyzed.(3)The short-cycle monitoring of indoor temperature and humidity in existing residential buildings was assessed,and the differences in indicators of indoor thermal environment were analyzed.At the same time,the TCR of the house investigated was calculated,and the reasons for the differences were analyzed.(4)The Dest-h software was applied to address the energy consumption of existing residences in different ages,and the differences and the causes were analyzed.Through investigation,we know that,in recent years,the departments have conducted energy-saving renovation on most of the existing residences built in the 1980 to1990 s.Therefore,we simulated the energy consumption and calculated the TCR of existing residential buildings before and after the renovation.Finally,comparing energy consumption with the standard,we analyzed the differences.By analyzing the changes of energy consumption and indoor thermal comfort rate of existing residential buildings before and after the renovation,we learned that the existing residential envelope was the main factor affecting both of them.Based on this,the paper studied the effects of different enclosure structures on the energy consumption and indoor thermal comfort rate with the control variable method.(Wall insulation,Window-wall ratio,Glass type,Shading,Roof insulation)(5)Taking the orthogonal test as the theoretical support,the combination test arrangements were made on the main envelope structures,which affected the energy consumption and the indoor thermal comfort rate of existing houses.Based on the results of simulation and calculation,the optimal combinations of enclosure structures for energy-saving retrofitting of existing residential buildings were selected on the premise of thermal comfort,and the importance of the impact factors were ranked.