Steady-state calorimetry method to measure the ventilation rate in an airspace

Yuanhui Zhang, Leslie L. Christianson, Gerald L. Riskowski

Research output: Contribution to journalConference articlepeer-review


In many cases, airflow rates through microenvironments (e.g., zones within a room) are unknown and vary considerably from mean room (macroenvironmental) conditions. A steady-state calorimetry method to estimate the ventilation rate in an airspace is described. The method can be applied not only to enclosed, mechanically ventilated airspaces but also to those less-enclosed airspaces such as a room with a door open or a zone within a room. The method is more appropriate for small airspaces (e.g., zones within a room) where thermal capacitance effects are of little influence. Large airspaces usually have large heat capacitances, which can result in failure to reach a steady state because of the superimposed heating, ventilating, and air-conditioning (HVAC) system and diurnal temperature fluctuations. Limitations of the steady-state calorimetry method are also discussed.

Original languageEnglish (US)
Pages (from-to)300-304
Number of pages5
JournalASHRAE Transactions
Issue number2
StatePublished - Dec 1 1994
Externally publishedYes
EventProceedings of the ASHRAE Annual Meeting - Orlando, FL, USA
Duration: Jun 25 1994Jun 29 1994

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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