ABSTRACT
There are several factors that influence thermal comfort: air temperature, air velocity, relative humidity, radiant environment, clothing and activity level. Air temperature is the most common measure of comfort, and the one that is most widely understood. An air-conditioning system provides the controlled environment in which the following parameters are maintained within desired ranges: temperature, humidity, air distribution and indoor air quality in order to build up a comfortable and healthy indoor environment for people to work or live in. Thermal comfort and minimum health requirements must be achieved by the basic controls of the air-conditioning system, while the optimal control of the systems aims at providing satisfied thermal comfort and indoor air quality with minimum energy input.
