Indoor Thermal and Ventilation Indicator on University Students’ Overall Comfort

Lin-rui JIA, Qing-yun LI, Xi CHEN, Chi-chung LEE, Jie HAN

Research output: Journal PublicationsJournal Article (refereed)peer-review


Thermal comfort (TC) and CO2 concentration significantly influence the overall indoor comfort sensations of building occupants. However, few studies have focused on educational buildings regarding both TC and CO2 concentration in tropical regions, and they also lack guidelines for short-term evaluation, which is essential for university classrooms. In this study, a mechanically ventilated university classroom was selected to investigate the 5 min-averaged comfort ranges for indoor parameters and the impacts of TC and variation of CO2 on student overall comfort. The real-time indoor environmental parameters were monitored, including indoor air temperature (Ta), mean radiant temperature (Tm), relative humidity (RH) and CO2 and air velocity (va); the operative temperature (Top) was calculated. Moreover, an online-based questionnaire survey related to thermal sensation (TS) and CO2-related air sensation (AS) was carried out. Linear and nonlinear regression models of comfort sensation predictions were obtained based on the questionnaires and corresponding measured indoor environmental data. The 5 min-averaged comfort ranges for Top, CO2 and RH are 21.5–23.8 °C,
Original languageEnglish
Article number1921
Issue number11
Publication statusE-pub ahead of print - 8 Nov 2022

Bibliographical note

This work was financially supported by the University Grants Council of the Hong Kong Special Administrative Region, China (UGC/FDS16/P01/20) and Hong Kong Metropolitan University Research Grant (No. 2020/1.3).


  • indoor air quality
  • ventilation indicator
  • thermal comfort
  • university classroon
  • questionnaire survey
  • regression analysis


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