Research on Thermal Environment of University Classrooms in Severe Cold Areas Based on Different seating rate

College classrooms are the main place for teachers' teaching and student learning. The quality of the thermal environment in the classroom is directly related to the students' physical and mental health and learning efficiency[1]. In the cold regions, the classrooms of colleges and universities are often closed, and the seating rate is generally high. Through the on-site actual measurement of the classroom of the School of Architecture of Harbin Institute of Technology, this paper compares and analyzes the changes of thermal environment in the classroom under the three typical seating rates of 0.2, 0.5 and 1.0. The results showed that in the closed classroom, there is a positive correlation between the seating rate and the indoor temperature and humidity. The high heat dissipation rate of the human body has a significant effect on the indoor air temperature and humidity.When the seating rate is 0.2-0.5, the temperature rise is more obvious. At a seating rate of 0 and 1.0,the highest indoor air temperature is located in the southeast corner of the classroom and the highest relative humidity is located in the southwest corner of the classroom.