Simulation of Different Ventilation Methods on Indoor Air Quality and Thermal Comfort in College Classroom

Indoor air quality in university classrooms is closely related to human thermal comfort, and proper air distribution can dilute indoor air pollutants in time and create a healthy and comfortable indoor environment. This paper selects the classroom of a university in Shenyang as the research object, through numerical simulation of the ventilation modes of up-flow and up-return, up-flow and down-return, and side-flow and down-return, the indoor temperature field, velocity field, CO2 concentration field and PMV-PPD index were obtained. The results show that the most ideal temperature field, velocity field, CO2 concentration field and thermal comfort can be obtained by using the side-flow and down-return air supply mode in the classroom, the temperature in the classroom is in the range of 16–24 ℃, the wind speed is low, and the air distribution is uniform in the area where people are concentrated; The pollutant removal efficiency is high, and CO2 is taken away from the release source position with the air flow, which reduces the CO2 exposure intensity of the breathing microenvironment; Students’ thermal feeling is in a slightly warm state, and the percentage of dissatisfaction with the thermal environment is the lowest.