IMPROVEMENTS OF INDOOR HUMIDITY PERFORMANCE BY A NOVEL AIR-CONDITIONING SCHEME: CHILLED-CEILING COMBINED WITH DESICCANT COOLING

摘要

A novel HVAC system, chilled-ceiling combined with desiccant cooling is proposed for an office room in hot and humid climates in Hong Kong. Studies found that improved indoor humidity performance can be obtained in comparison with a traditional all-air conditioning system. Actually, for conventional constant volume all air system, the minimum RH is in July and the RHs are well controlled to around 50% in summer season. In winter and transient seasons, the RHs rise up. RHs bigger than 70% occasionally occur in these seasons. In contrast, the chilled ceiling combined with desiccant cooling system controls indoor temperature and humidity independently. The variations of monthly averaged RH are relatively small and they are in phase with outside humidity fluctuations: maximum in August and minimum in February.