Relative ventilation effectiveness in a mechanically ventilated airspace under isothermal conditions

R. G. Maghirang, Sheryll B. Jerez, B. Z. Predicala

Research output: Contribution to journalArticlepeer-review


The relative ventilation effectiveness for airborne dust was evaluated in a mechanically ventilated airspace under isothermal flow conditions. Three supply air inlets, specifically, one-way ceiling, two-way ceiling, and sidewall, were compared at ventilation rates of 0.1, 0.5, 0.7, and 1.0 m3/s. The dust concentrations were measured with inhalable dust samplers, from which the relative ventilation effectiveness at various locations, the overall relative ventilation effectiveness for the airspace, and the spatial variability in dust concentrations were obtained. Results showed that the dust concentration and the relative ventilation effectiveness varied with location and for the three air inlets. The one-way ceiling air inlet, in which the supply air jet was directed away from the exhaust fan, was the best in removing the dust from the locations considered. It had the highest overall relative ventilation effectiveness (Eo = 1.34), although it also had the highest spatial variability in dust concentration (CV = 0.48). The sidewall air inlet, on the other hand, had the most uniform dust concentration (CV = 0.38); however, it had the lowest relative ventilation effectiveness (Eo = 0.67). Additional research should consider other types of air inlets and nonisothermal conditions.

Original languageEnglish (US)
Pages (from-to)691-696
Number of pages6
JournalTransactions of the American Society of Agricultural Engineers
Issue number3
StatePublished - 2001
Externally publishedYes


  • Air quality
  • Airborne dust

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


Dive into the research topics of 'Relative ventilation effectiveness in a mechanically ventilated airspace under isothermal conditions'. Together they form a unique fingerprint.

Cite this