Experimental and numerical study of local mean age of air

AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
Proceedings titleProceedings of Building Simulation '01
ConferenceBuilding Simulation '01, August 13-15, 2001, Rio de Janeiro, Brazil
AbstractThis paper presents the results from the experimental and numerical study of a room with mixing ventilation, focused on the local mean age of air (LMA). The measurements were performed using the tracer gas concentration decay method. The numerical predictions were obtained from the computational fluid dynamics (CFD) module of the latest version of the ESP-r software. In order to address the requirement for a proper choice of the number of control volumes in CFD, the analysis is made by comparing the results from two consequently finer numerical grids. Some guidelines for practicing engineers are given concerning the number of numerical grid points and their distribution, reasonable for buildings energy simulations. The guidelines are based on common CFD rules supported by examples from the presented computations. Both the fine and the coarse grid computations gave results, which were very close to the measurements. An important issue of the present study is that the coarse grid computations are reasonably close to the measured values, which allows the computation of LMA to be made on relatively coarse numerical grids - sometimes (as in the present study) as low as approximately 1000 grid points.
Publication date
Peer reviewedYes
NRC publication
This is a non-NRC publication

"Non-NRC publications" are publications authored by NRC employees prior to their employment by NRC.

NPARC number21274059
Export citationExport as RIS
Report a correctionReport a correction
Record identifier00a0f4e6-ab7a-4d88-9331-1afe898b70e5
Record created2015-02-10
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)