Energy saving potentials of an 100% outdoor air system integrated with indirect and direct evaporative coolers for clean room

In general, HVAC systems for clean room facility are required significant energy to maintain the required indoor environment. Due to high air change rates, reducing operating energy consumptions has been the critical issue. The purpose of this paper is to investigate energy saving potentials of 100% outdoor air system integrated with indirect and direct evaporative coolers (IDECOAS) serving a clean room. This research also provides a practical insight how cooling and heating coil loads can be reduced and how to design the proposed system. In this study, it was assumed that a clean room is served by four different types of HVAC systems; a variable air volume system (VAV), an air washer system(AIRWASH), a dedicated outdoor air system (DOAS), and IDECOAS. It was found that DOAS and IDECOAS can reduce the annual cooling and heating coil loads over 65.7% and 59.5%, respectively, compared with the VAV.