Effects of Measurement Intervals on Estimation of Ammonia Emissions from Layer Houses

Thumbnail Image
Date
2006-01-01
Authors
Xin, Hongwei
Gates, Richard
Wheeler, Eileen
Casey, Kenneth
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Research Projects
Organizational Units
Journal Issue
Is Version Of
Versions
Series
Department
Agricultural and Biosystems Engineering
Abstract

Continuous quantification of aerial emissions from animal feeding operations over an extended time period is labor and resource intensive. Strategically reducing measurement time to achieve comparable emission results is thus highly desirable. This article delineates the effects of measurement intervals on estimation of annual mean and maximum daily ammonia emission rate (ER) of high-rise (HR) and manure-belt (MB) layer houses. The full dataset consisted of 318 daily ER values of four HR houses from weekly 48 h continuous measurement and 112 daily ER values of two MB houses from bi-weekly 48 h continuous measurements over one-year period. Each full dataset was sampled to yield subsets of daily ER at different intervals, i.e., one week (HR houses only), two weeks, one month, two months, or three months. The corresponding estimates of annual ammonia ER from the subsets were computed and compared with that of the full dataset. The results indicate that the annual mean daily ER values derived from the subsets progressively deviated from that of the full dataset by 3% to 37% for the HR houses and by 6% to 41% for the MB houses. The augmented measurement intervals (i.e., greater than bi-weekly for the HR houses and greater than monthly for the MB houses) led to considerable underestimation of the daily maximum ER values, and thus are not recommended when daily maximum emission values are to be assessed.

Comments

This article is from Transactions of the ASAE 49, no. 1 (2006): 183–186.

Description
Keywords
Citation
DOI
Source
Copyright
Sun Jan 01 00:00:00 UTC 2006
Collections