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- W2186467176 abstract "Determination of emission of contaminant gases as ammonia and methane from natural ventilated livestock buildings with large opening is a challenge due to the large variety in gas concentration and air velocity in the openings. The close relation between calculated animal heat production and the carbon dioxide production from the animals have in several cases been utilized for estimation of the emission of ammonia and other gasses. Using this method the problem of the complicated air velocity and concentration distribution in the openings is avoided, but still there is considerable doubt about (1) the precision of the estimations (2) the requirement for the length of measuring periods, and (3) the required measuring point number and location. The purpose of this work was to investigate how estimated average gas emission and the precision of the estimation is influenced by different calculation procedures, different measuring period length, different measure point locations, different measure point numbers and different criteria for excluding measuring data. The analyses is based on existing data from a 6 days measuring period in a naturally ventilated, 150 milking cow building, and it shows that the methane emission can be determined with much higher precision than ammonia emission, and, for methane, relatively precise estimations can be based on measure periods as short as 3 hours. This result makes it feasible to investigate the influence of feed composition on methane emission in a relative large number of operating cattle buildings and consequently it can support a development towards reduced greenhouse gas emission from cattle production. For ammonia the analyses did not reveal any shortcuts to precise and simple estimation of emission from naturally ventilated buildings." @default.
- W2186467176 created "2016-06-24" @default.
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- W2186467176 date "2010-01-01" @default.
- W2186467176 modified "2023-09-27" @default.
- W2186467176 title "USE OF GAS CONCENTRATION DATA FOR ESTIMATION OF METHANE AND AMMONIA EMISSION FROM NATURALLY VENTILATED LIVESTOCK BUILDINGS" @default.
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