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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Upward vs. downward ventilation air flow in a swine house  [1990]

Breum, N.O. (National Institute of Occupational Health, Copenhagen, Denmark); Takai, H.; Rom, H.B.;

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Several ventilation system designs are in common use, and very little is known about their relative performance in achieving an acceptable livestock building air quality. A ventilation system may be characterized quantitatively from the efficiency (beta ) of the air exchange process and the effectiveness (epsilon) of the contaminant removal process. The theoretical framework is summarized and applied in an intervention study of upward versus downward air flow in a swine house. The contaminants considered were NH3, CO2, dust, and excessive heat. It was concluded that the air exchange efficiency of upward air flow was superior to downward air flow. For some contaminants (CO2, excessive heat, dust) the ventilation effectiveness of upward air flow was superior to downward air flow
From the journal
Transactions of the ASAE (USA)
ISSN : 0001-2351

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
1991
Volume:
33
Issue:
5
Start Page:
1693
End Page:
1699
All titles:
"Upward vs. downward ventilation air flow in a swine house"@eng
Other:
"references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
1991
Volume:
33
Issue:
5
Start Page:
1693
End Page:
1699
All titles:
"Upward vs. downward ventilation air flow in a swine house"@eng
Other:
"references"