Ventilation performance measurement using constant concentration dosing strategy

Christopher Y. Chao, M. P. Wan, Anthony K. Law

Research output: Journal article publicationJournal articleAcademic researchpeer-review

50 Citations (Scopus)


Air change performances of an office with variable air volume (VAV) mechanical ventilation system and a domestic apartment with natural ventilation were evaluated using tracer gas techniques. Both the constant concentration and the decay method were utilized. Experimental results showed that the domestic apartment with opened windows performed better than the VAV system in terms of air-exchange efficiency, and maintained the highest air change rate. However, poor air change rate and air-exchange efficiency were resulted when the windows were closed in the home. By comparing the measurement results from the two tracer gas methods, it is found that the results obtained by the constant concentration dosing method were compatible with that obtained from the widely adopted tracer decay method. Several recommendations for conducting constant concentration dosing test were also discussed in this article.

Original languageEnglish
Pages (from-to)1277-1288
Number of pages12
JournalBuilding and Environment
Issue number11
Publication statusPublished - Nov 2004


  • Air change rate
  • Air-exchange efficiency
  • Constant concentration dosing strategy
  • Natural ventilation
  • Tracer gas decay method
  • Variable air volume (VAV)

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Geography, Planning and Development
  • Building and Construction


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