کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8055044 | 1519510 | 2016 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Temporal and spatial variation of methane concentrations around lying cubicles in dairy barns
ترجمه فارسی عنوان
تنوع زمانی و مکانی غلظت متان در اطراف حیاط دروغ در انبارهای لبنی
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کلمات کلیدی
غلظت متان، دراز کشیدن تنوع غلظت، روش ارزیابی تولید متان، تنوع اندازه گیری،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
کنترل و سیستم های مهندسی
چکیده انگلیسی
To breed cows for low methane production, farm measurement methods are required to measure individual methane production of cows. The long lying period of cows in cubicles could be utilised here. However, variable aerial conditions around cubicles may challenge this approach. The objective of this study was to (1) assess temporal and spatial variability of methane concentrations around cubicles; (2) explore influencing factors on them; and (3) assess effects of barn background variability in methane concentrations on assessed individual methane production. Concentrations around two cubicles in a naturally ventilated dairy barn were measured during a summer and a winter period. The effect of barn background variability in methane concentration on individual cow measurements was analysed in relation to the working principles of the breath methane concentration and methane flux methods. Mean methane concentrations around the cubicle were 29-37Â ppm in the summer and 33-51Â ppm in the winter period. Spatial variations of hourly averages of methane concentration around the cubicle were 71% in the summer and 58% in the winter period. Temporal variations of hourly averages of methane concentration varied from 115 to 153% in the summer, and from 57 to 109% in the winter period among the sample locations. These variations were mainly affected by airflows and barn management. The coefficient of variation (CV) of the background concentration strongly influenced the overall measurement CV of assessed methane production, in both the methane flux and breath methane concentration method. This information can be used to limit measurement variation in methane measurement methods.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biosystems Engineering - Volume 151, November 2016, Pages 464-478
Journal: Biosystems Engineering - Volume 151, November 2016, Pages 464-478
نویسندگان
Liansun Wu, Peter W.G. Groot Koerkamp, Nico W.M. Ogink,