DOI: 10.1016/j.atmosenv.2013.12.030
Scopus记录号: 2-s2.0-84892878242
论文题名: A direct method of measuring gaseous emissions from naturally ventilated dairy barns
作者: Joo H ; S ; , Ndegwa P ; M ; , Heber A ; J ; , Bogan B ; W ; , Ni J ; -Q ; , Cortus E ; L ; , Ramirez-Dorronsoro J ; C
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 86 起始页码: 176
结束页码: 186
语种: 英语
英文关键词: Area inlets
; Area outlets
; Direct ventilation rates
; Emission rates
; Indirect ventilation rates
; Ultrasonic anemometer
Scopus关键词: Area inlets
; Area outlets
; Emission rates
; Indirect ventilation
; Ultrasonic anemometer
; Ventilation rate
; Air
; Anemometers
; Dairies
; Investments
; Ventilation
; Ventilation exhausts
; Farm buildings
; airflow
; anemometer
; atmospheric pollution
; capital formation
; dairy farming
; industrial emission
; outflow
; pollutant transport
; sampling
; spatiotemporal analysis
; ventilation
; air conditioning
; air pollutant
; airflow
; anemometer
; article
; concentration (parameters)
; controlled study
; cost
; dairy industry
; exhaust gas
; meteorology
; priority journal
; ultrasound
; wind
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Air pollutant emission rates from mechanically ventilated (MV) dairy barns are determined from the product of the differences in concentrations of pollutants in air at the inlet and exhaust points and the corresponding ventilation rates. In contrast to well defined entry and exit points in MV barns, large area air inlets or outlets characterize naturally ventilated (NV) freestall dairy barns. Complicating this scenario even more, pertinent airflow characteristics (velocity and direction) necessary for determining ventilation rates vary continuously, both temporally and spatially. This paper describes implementation of a direct method, generally equivalent to the approach used for MV barns, for determining air emission rates of NV barns. Ultrasonic anemometers (sonics) located at salient points in the barn openings mapped air inflow and outflow velocities necessary to calculate ventilation rates. Pollutant concentrations in the air entering or leaving the barn during a given period were measured at sampling points located next to the anemometers. The air inflow rates were, in general, higher than the air outflow rates from the barns, but diurnal profiles were similar. The observed ventilation characteristics were consistent with prevailing wind directions. Air inflows were observed predominantly at windward openings of the barn, while the outflows were mainly at the barn's leeward openings. Results indicated that either: (i) the average of the air inflow and outflow rates (averaging approach), or (ii) the air inflow rates (inflow-only approach) were credible representations of ventilation rates. Results also revealed use of an on-site weather station and one sonic mounted in the middle of each wall of the barn as a possible approach for determining barn ventilation rates. The suggested use of ventilation rates for interpolating missing concentrations from intermittent gas measurements could potentially increase the integrity of emission rates at significantly lower capital investment and operational costs. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80752
Appears in Collections: 气候变化事实与影响
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作者单位: Biological Systems Engineering, Washington State University, PO Box 646120, Pullman, WA 99164, United States; Agricultural and Biological Engineering, Purdue University, 225 South University Street, West Lafayette, IN 47907, United States; Agricultural and Biosystems Engineering, South Dakota State University, Brookings, SD 57007, United States; Natural Resources and Environmental Management, Ball State University, 2000 W. University Ave., Muncie, IN 47306, United States
Recommended Citation:
Joo H,S,, Ndegwa P,et al. A direct method of measuring gaseous emissions from naturally ventilated dairy barns[J]. Atmospheric Environment,2014-01-01,86