Energy analysis for workshops with floor-supply displacement ventilation under the U.S. climates

Josephine Lau, Qingyan Chen

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Many studies have shown that floor-supply displacement ventilation systems are better than mixing ventilation systems. The benefits include indoor air quality, thermal comfort and reduced energy use. The energy benefits depend on the climate conditions. This research compared the energy use of a floor-supply displacement ventilation system in a large industrial workshop with that of a mixing ventilation system for five U.S. climate regions. It was found that the energy use and the system performance vary with the locations. The displacement ventilation system may use more fan and boiler energy but less chiller energy than the mixing ventilation system. The total energy used is slightly less with displacement ventilation, although the ventilation rate was increased in order to handle the high cooling loads found in U.S. buildings. Thus, the displacement ventilation system can save some energy in cooling mode. However, displacement ventilation system has a lower capacity of dehumidification. This system alone, thus, is not suggested for use in humid regions.

Original languageEnglish (US)
Pages (from-to)1212-1219
Number of pages8
JournalEnergy and Buildings
Issue number10
StatePublished - Oct 2006
Externally publishedYes


  • Climates
  • Energy cost
  • Energy performance
  • Floor-supply displacement ventilation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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