Coffey, CJ and Hunt, GR (2006) New ventilation efficiency measures based on buoyancy removal. HB 2006 - Healthy Buildings: Creating a Healthy Indoor Environment for People, Proceedings, 4. pp. 247-250.Full text not available from this repository.
New measures for estimating the efficiency of transient ventilation flows are proposed. These measures are developed by considering how effectively a ventilation system removes buoyancy from a space. This approach is distinct from standard efficiency measures which are, in general, based on the removal of a neutrally-buoyant passive tracer. Our new measures, based on (active) buoyancy removal, allow both the instantaneous and time-averaged efficiency of the entire space, or of any region within it, to be determined. In addition, expressions for determining vertical profiles of efficiency are proposed. These new measures enable the effectiveness of different flows to be compared directly and are applicable providing density (temperature) differences exist between the interior environment and the replacement air. Thus, they may be used to contrast the effectiveness of a broad range of building ventilation flows including natural, hybrid and forced ventilation.
|Uncontrolled Keywords:||Buoyancy removal Forced Hybrid Natural Transient flows Ventilation efficiency measures|
|Divisions:||Div A > Fluid Mechanics|
|Depositing User:||Cron job|
|Date Deposited:||04 Feb 2015 23:01|
|Last Modified:||05 Feb 2015 08:20|