Research On Thermal Environment Optimization Design Of Teaching Buildings In Universities Of Different Ages In Xi’an Region

There are many colleges and universities in Xi ’an,which have experienced three concentrated construction periods of 1950-60’s,1980-90’s and the early 21 st century.There are a large number of teaching buildings built in these three different eras on the campus.Influenced by history,technology,culture and other factors,the teaching buildings of colleges and universities in different ages have different architectural characteristics,and also expose many different thermal environment problems.Based on domestic and foreign thermal environment theories,this study builds a thermal environment design research system for university teaching buildings in Xi ’an area.According to this system,27 university teaching buildings of different ages in Xi ’an area are investigated from four aspects: site planning,modeling space,envelope structure and historical building protection,and three teaching buildings of Chang ’an University are selected as typical cases of teaching buildings of three ages.Based on the methods of field investigation,thermal environment measurement,questionnaire survey and De ST simulation,the thermal environment problems,cooling and heat load characteristics and thermal environment design problems of university teaching buildings in Xi ’an area in different years are summarized.Based on the five principles of climate suitability,comfort and energy saving,method suitability,safety and sustainability,and historical continuity,this study proposed thermal environment optimization design strategies for university teaching buildings in Xi ’an in different years from three aspects of site planning,modeling space,and enclosure structure,and applied these design strategies to the three teaching buildings of Chang ’an University.Through De ST simulation of the optimization scheme and comparison of the building thermal environment and cooling and heating load before and after optimization,it can be seen that after optimization,the number of hours that all the rooms of the three buildings are in the comfortable natural room temperature range throughout the year increases to varying degrees,with the increase range between 20% and 40%,and the cooling and heating load of the three buildings decreases by about 20%.In summary,different thermal environment optimization strategies for three different years of university teaching buildings in Xi ’an area are feasible and effective.This study not only provides a reference for the thermal environment optimization design of university teaching buildings in different years in Xi ’an area,but also provides a method for reference for the thermal environment design of university teaching buildings in the future.