A comparison of indoor humidity behaviors : all-air and chilled-ceiling with desiccant cooling

L.Z. Zhang, Jianlei Niu, H. Zuo

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review

26 Citations (Scopus)


Indoor humidity behaviors with a system combining chilled-ceiling and desiccant cooling (CC+DC) in hot and humid climates are investigated and compared with a conventional constant volume all-air system (CAV). Room mean temperature, mean humidity, maximum RH on the ceiling panel surfaces, annual condensation hours are predicted using a building energy simulation code ACCURACY and a moisture balance analysis method in an office room under Hong Kong weather conditions. The results show that the system controls the indoor humidity poorly in transient seasons, but in comparison, the CC+DC system provides better indoor humidity environment most of the year. For CC+DC, air dehumidification and ventilation system should be operated at least one hour earlier than the operation of ceiling panels. Otherwise, condensation may occur.
Original languageEnglish
Number of pages6
Publication statusPublished - 2002
EventInternational Conference on Indoor Air Quality and Climate [Indoor Air] -
Duration: 1 Jan 2002 → …


ConferenceInternational Conference on Indoor Air Quality and Climate [Indoor Air]
Period1/01/02 → …


  • Radiant cooling
  • Humidity
  • Desiccant cooling
  • Condensation

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