EFFECT OF VARIATIONS IN THERMAL CONDITIONS ON THERMAL COMFORT, COGNITIVE PERFORMANCE AND ELECTROENCEPHALOGRAM SIGNALS

Abstract

This research paper focuses on variations of indoor thermal conditions and its effect on thermal comfort, cognitive performance and electroencephalogram (EEG) signals. In Singapore, the Building and Construction Authority (BCA) have been emphasizing on Super Low Energy (SLE) strategies for sustainability efforts in the built industry. The strategies include the adoption of hybrid system: the usage of ceiling fan in indoor space to elevate indoor air movement. Utilizing ceiling fans can increase the energy savings for air-conditioned buildings operated at warmer setpoint temperatures without sacrificing user comfort.

In this research study, the environments (24? and 27? environment with ceiling fan) were compared to understand more on the thermal sensations, comfort and acceptability of the environments. EEG and cognitive tests were used as objective measurements for the assessment of thermal comfort. The results showed that the subjects felt thermally comfortable in both environments and perceive stronger air movement in the 27? environments with ceiling fan. This is so as the usage of elevated fans enhances air movement, increasing convective heat loss from the skin. No significant difference was found between the cognitive performance and EEG signals of the subjects across the two environments. As such, subjects do not experience any significant cognitive load or arousal from heat stress in the two environments.