One of the primary purposes of heating, ventilating and air conditioning (HVAC) systems is to make occupants comfortable in terms of thermal comfort. The indicator of human thermal comfort
is technically called the thermal comfort index. The most widely used thermal comfort index is the Predicted Mean Vote (PMV) index, which was developed by Fanger. Practical applica-
tion of the heat balance equation was proposed by formulating a thermal comfort equation which allows the prediction of the thermal sensation of a group of persons in an arbitrary but
stationary climate via Predicted Mean Vote (PMV).