
Agricultural and Biosystems Engineering Publications
Title
Comparison of Direct vs. Indirect Ventilation Rate Determinations in Layer Barns using Manure Belts
Document Type
Article
Publication Version
Published Version
Publication Date
2005
Journal or Book Title
Transactions of the ASAE
Volume
48
Issue
1
First Page
367
Last Page
372
Abstract
Direct measurement of building ventilation rate in livestock housing is a formidable task due to uncontrollable variations in fan and system performance that are caused by factors such as building static pressure, fan belt slippage, and dust accumulation on shutters and blades. Estimating building ventilation rate by an indirect method based on a CO2 balance offers a potentially viable alternative to direct measurement. The validity of the CO2 balance method depends on the validity of relationship between CO2 production inside the building and metabolic rate of the animals and the knowledge of CO2 generation by the housing environment. Metabolic rates of modern laying hens have recently been quantified in intensive large-scale laboratory measurements. However, performance of the indirect method remains to be evaluated under field conditions. This article compares building ventilation rates obtained by direct measurement and by a CO2 balance. The test was conducted at a commercial laying hen house that used manure belts with daily manure removal. The results indicate that ventilation rates estimated by the indirect method were not significantly different (P > 0.2) from those as determined by the direct measurement when the averaging or integration time interval was 2 h or longer. Careful application of the indirect method could greatly improve the affordability and versatility of endeavors toward quantifying air emissions from confined animal housing.
Access
Open
Copyright Owner
American Society of Agricultural Engineers
Copyright Date
2005
Language
en
File Format
application/pdf
Recommended Citation
Li, Hong; Xin, Hongwei; Liang, Yi; Gates, Richard S.; Wheeler, Eileen F.; and Heber, Albert J., "Comparison of Direct vs. Indirect Ventilation Rate Determinations in Layer Barns using Manure Belts" (2005). Agricultural and Biosystems Engineering Publications. 158.
https://lib.dr.iastate.edu/abe_eng_pubs/158
Comments
This article is from Transactions of the ASAE 48, no. 1 (2005): 367–372.