Experimental Test And Thermal Comfort Research On Indoor Thermal Environment Of College Classroom In Taiyuan In Cold Region

College classrooms are important places for students to attend classes.Students spend about one-third of their time in the classroom every day.The classroom thermal environment in the classroom has a close influence on students’ comfort and efficiency in class.A comfortable thermal environment in the classroom will help improve the efficiency of students’ listening to lessons.Being in a poor classroom environment for a long time will lead to adverse reactions such as inattention and learning difficulties,and even damage the physical and mental health of students.Although some scholars at home and abroad have conducted researches on the indoor thermal environment and thermal comfort of college buildings in recent years,there are few studies on the thermal comfort of college classrooms under the winter heating mode in cold regions of my country.Therefore,it is necessary to study the indoor thermal environment and thermal comfort of college classrooms in cold regions of our country.This paper takes a university classroom in Taiyuan in the cold area as the research object,and conducts on-site measurements of the indoor and outdoor thermal environment of the university classrooms before and after heating in Taiyuan area.At the same time,a subjective questionnaire survey was conducted on the thermal comfort of students in indoor classrooms.;and the corresponding thermal environment evaluation is proposed.model.The research results show that the measured thermal neutral temperature in the classrooms of colleges and universities before heating in Taiyuan is 25.38℃,and the 80% satisfaction thermal comfort temperature range is 19.3℃ ～ 31.4℃,while the indoor thermal neutral temperature calculated according to PMV is 23.73℃.80% satisfaction thermal comfort temperature range is 13.3℃ ～ 34.2℃;after heating,the measured thermal neutral temperature in the classroom is 24.34℃,80% satisfaction thermal comfort temperature range is 20.2℃ ～ 28.6℃,and the indoor calculated according to PMV Thermal neutral temperature is 22.56℃,80% satisfaction thermal comfort temperature range is 16.9℃～28.2℃;It shows that there is a certain deviation between the thermal sensation predicted by the PMV model before and after heating in college classrooms and the measured thermal sensation;it is verified that the Griffiths model can accurately predict the thermal comfort temperature in the classroom in this area,the predicted value is 25.12 ℃ before heating,and24.01 ℃ after heating;The PMV-PPD model is optimized by the least square method,and the PMV correction equation is established.The proposed mathematical model is very suitable for the evaluation of indoor thermal environment before and after winter heating in college classrooms in cold areas.Through the research on the indoor thermal environment and thermal comfort before and after the heating of college classrooms in the cold area of Taiyuan in winter,it provides a certain reference for the improvement of the indoor thermal environment of college classrooms in cold areas in my country in winter.At the same time,it will help to enhance and improve the thermal environment in the classroom and improve the learning efficiency of students,and provide suggestions and basis for the formulation of indoor thermal environment specifications for college classrooms in cold areas in winter.