NCEUB Conferences, MC2014 Masters Conference People and Buildings

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Empirical study: investigating the effect of CO2 concentration on reported thermal comfort
Bingyun Liu, Stephanie Gauthier

Date: 2014-09-19 10:50 AM – 11:00 AM
Last modified: 2014-09-18


Research shows that an increase in indoor CO2 concentration stimulates the human respiratory system; this action will in turn increase metabolic rate and heat exchange with the environment. The hypothesis is that people may fell warmer. To investigate this effect, this paper presents the results of an empirical study carried out in a climate chamber over the summer of 2014. While the six predictive model independent variables were kept constant, eighteen participants were exposed to three conditions: an increase (1), then a decrease (2) in CO2 concentration, and finally a constant exposure (3). During the experiments, participants completed questionnaires, reporting on their comfort perception and concentration level. Preliminary results show that CO2 concentration has an effect on reported thermal comfort. This insight may be used in future studies to review the operation of ventilation systems, aiming to reduce energy consumption whilst minimising impact on occupants’ thermal comfort.

Keywords: Thermal comfort, Indoor CO2 concentration, Perceived concentration level