HVAC dehumidification systems for thermal comfort: a critical review

ABSTRACT The paper deals with moisture control in buildings during the summer season. Dehumidification is considered as a key feature of HVAC systems for thermal comfort. Principles of mechanical and chemical dehumidification are shown. In the mechanical dehumidification field, a proper control of ambient temperature and humidity can be obtained by means of an Air Handling Unit which treats outside air alone, while recirculating air is treated by a simple cooling coil. Various configurations and HVAC systems for a theatre and for a supermarket are analysed. The use of hybrid systems with desiccant wheel for these applications has shown: remarkable savings in operating costs and higher plant costs; a notable reduction of the power electric demand; a better control of ambient humidity.