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Determination of Minimum Ventilation Rate in Pig Houses with Natural Ventilation based on Carbon Dioxide Balance |
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| Institution: | 1. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China;2. CAS Excellence Center for Nanosciences, National Center for Nanoscience and Technology of China, Beijing 100190, China;1. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China;2. Key Laboratory of Energy Conservation and Waste Treatment of Agricultural Structures, Ministry of Agriculture, Beijing 100081, PR China;3. Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China;1. College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, People’s Republic of China;2. College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, People’s Republic of China;3. Heilongjiang Agricultural and Rural Department, 4-1 Wenfu Street, Harbin 150060, People’s Republic of China |
| Abstract: | The measurement of ventilation rate is necessary for good climatic control in pig houses with natural ventilation and heating. A model based on a carbon dioxide balance is developed for pig houses. Included are diurnal variation patterns in carbon dioxide production. The model can estimate the ventilation rate in a pig house when carbon dioxide concentration in the pig house is measured. Measurements were made of the rates of decay in concentrations of a tracer gas in an occupied pig house with natural ventilation. The results of the tracer gas experiments and carbon dioxide model calculations showed a mean discrepancy of 13% for a natural ventilated pig building over ventilation rates between 0·1 and 0·3 kg/s. This indicates that estimation of ventilation rates by using carbon dioxide measurements and applying the carbon dioxide model can be a convenient technique in climatic control of pig houses with natural ventilation. |
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