Study On The Thermal Environment Of University Classrooms In Severe Cold Region

University classrooms are high-frequency using places for students to concentrate on learning.Due to factors such as special climatic conditions,closed indoor environment in winter,and high attendance rate of courses,the indoor thermal environment of university classrooms in severe cold area is relatively complicated.This thesis takes the indoor thermal environment of the university classrooms in severe cold area as the research goal,takes the Zhengxin Building in Harbin Institute of Technology as a typical model,and selects 12 classrooms as research samples.Using field measurement,subjective questionnaire investigation and data analysis to systematically and typically study the thermal environment of university classrooms in severe cold area,and according to the research results,the corresponding thermal environment optimization strategy is proposed.This thesis selects Harbin,a typical city in the severe cold area,as the research site,and selects the Zhengxin Building,a typical teaching building in Harbin Institute of Technology,as the measurement site.First of all,through literature analysis,the orientation,floor,student attendance rate are proposed as the effecting factors of classroom thermal environment,the field measurement program formulating and the questionnaire designing are done according to the effecting factors of classroom thermal environment.Secondly,the typical meteorological days in winter and summer are selected to conduct field measurement and subjective investigation of thermal comfort on the selected classroom samples.Finally,through analyzing the data of the measurement and investigation results,the following conclusions are obtained:In the winter measurement,the floor factor has a very significant effect on the classroom thermal environment.The indoor attendance factor has a significant effect on the indoor thermal environment and has a positive correlation with air temperature,relative humidity,and CO2 concentration.The orientation factor has no significant effect on the indoor thermal environment of the classroom.During the measurement,the relative humidity of all classrooms can not meet the requirements of the thermal comfort standard.The winter subjective investigation results show that the excessively low relative humidity in the classroom does not have a significant effect on the students’ winter thermal comfort,and the students’ heat and humidity sensation is good,students’ evaluation of the overall thermal environment is relatively well.In the summer measurement,the orientation factor has a significant effect on the indoor thermal environment of the classroom.Among the classrooms on the same floor,the air temperature in the southwest-facing classroom is the highest.The floor factor has a significant effect on the indoor thermal environment of the classroom.Student attendance has little effect on summer classroom thermal environment.The relative humidity of each classroom during the measurement meets the requirements for relative humidity in the thermal comfort standard.The results of the summer subjective investigation show that the students’ heat and humidity sensation is well,and most students are satisfied with the overall thermal environment of the classrooms.The subjective evaluation of the classroom thermal environment in summer is significantly better than that in winter.