Experimental study on floor-supply displacement ventilation system under various heat load conditions

Junta Nakano, Takashi Akimoto, Shin Ichi Tanabe, Ken Ichi Kimura

Research output: Contribution to journalConference articlepeer-review


The thermal performance of a floor-supply displacement ventilation system was evaluated in a large climate chamber designed to simulate a single span of an office building. Detailed measurements were made to investigate the indoor environment and thermal characteristics of this system. The temperature gradient in the room could be kept smaller by the cooling effect of an air-permeable floor. Lowering the height of heat sources, increasing the heat load, and decreasing the supply air volume all caused greater vertical temperature differences in the occupied zone. The temperature gradient was kept nearly constant throughout the room, though a temperature rise of 0.3°C - 0.5°C (0.5°F - 0.9°F) was observed near the heat source when clustered at one location. Perimeter load caused by warm or cold windows resulted in a disorder of the thermal stratification. Thermal comfort in the perimeter zone was considerably influenced by the radiation from the window.

Original languageEnglish
Pages (from-to)151-159
Number of pages9
JournalIAQ Conference
Publication statusPublished - 1997
EventConference on Design, Construction, and Operation of Healthy Buildings: Solutions to Global and Regional Concerns, IAQ 1997 - Washington, DC, United States
Duration: 2007 Sept 12007 Sept 1

ASJC Scopus subject areas

  • Building and Construction
  • Environmental Engineering
  • Public Health, Environmental and Occupational Health


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