Air conditioning and ventilation strategies in lecture rooms impact energy and indoor exposure with consequential effects on occupant satisfaction with the indoor environmental quality. Optimizing thermal comfort, ventilation effectiveness and energy efficient is challenging. Few field studies on the penalty of overventilation or under ventilation in lecture rooms with real occupant data and the associated occupant exposure have been reported. In this study, intervention was performed on the temperature setpoints in the lecture room operating with a Variable Air Volume Air-Conditioning system. There was uneven exposure to thermal and air quality of the occupants due to the stepped-incline seating design of the lecture room. We present a systematic analysis of the compromises among air conditioning energy, ventilation, CO2 exposure and occupants’ satisfaction in indoor space. In particular, there was diversity in the associated perception, satisfaction and health (SBS) symptoms.
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