Linked Life Data

12363211

Source:http://linkedlifedata.com/resource/pubmed/id/12363211

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
2002-10-4
pubmed:abstractText
The ventilation rate within a negatively pressurized room is usually determined by measuring the exhaust air flow rate. This method does not account for air mixing factors and gives limited information on ventilation efficiency within the room. Effective ventilation rates have been determined using tracer gases such as sulfur hexafluoride (SF6). The objective of this study was to determine whether artificially generated airborne particles could be used as a tracer to directly measure ventilation efficiency. We monitored the decay of artificially generated particles within negatively pressurized rooms. Separate trials were conducted at air exhaust rates ranging from about 6 to 20 room air changes per hour. Particles were generated to a minimum of 20 times the ambient concentration using a simple ventilation smoke bottle and measured with handheld light-scattering airborne particle counters. Data were obtained for aerodynamic particle size ranges of: 0.5 micron (microM) and larger, and 1.0 microM and larger. The time rate of decay of particles was plotted after subtracting the background concentrations. Results were compared with simultaneously conducted tracer gas decay analyses (ASTM method E741-95) using SF6. Particle concentrations followed an exponential decay (R2 = 0.98-0.99+) and mirrored the decay curve of the tracer gas. The air change rates predicted by the particle count procedure differed from the tracer gas results by a mean of 4.0 percent (range 0%-12%). The particle count procedure was substantially simpler and less expensive than the SF6 tracer gas method. Additional studies are needed to further refine this procedure and to explore its range of applicability.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
1047-322X
pubmed:author
pubmed:issnType
Print
pubmed:volume
17
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
704-10
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
A simple and inexpensive method for determining the effective ventilation rate in a negatively pressurized room using airborne particles as a tracer.
pubmed:affiliation
New York State Department of Health, Troy, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.