Abstract
Compost bedded pack (CBP) barns have been receiving increased attention as an alternative housing system for dairy cattle. To create a satisfactory environment within CBP barns that promotes a good composting process, an adequate air movement and minimal temperature fluctuations throughout the building are required. Therefore, a study based on compost barn structure model employing techniques of dimensional analysis for naturally ventilated buildings was developed. Three-dimensional computational fluid dynamic (CFD) simulations of compost barns with different ridge designs and wind direction, along with the visual demonstration of the impact on airflow through structure were performed. The results showed that the barn ventilation CFD model and simulations were in good agreement with the experimental measurements, predicting the airflow through the CBP barns structure for alternative roof ridge types adequately. The results also indicate that the best roof configuration in the winter was the open ridge with chimney for a west to east wind direction.
Highlights
Compost bedded pack (CBP) barns represent a relatively new loose housing system for dairy cows able to improve cow comfort [1,2]
The purpose of this study was to develop a 3D computational fluid dynamic (CFD) model to investigate the performance of a CBP barn structure with a natural ventilation system and its influence on the surface of the bed, faced with different wind directions and roof configurations
Dairy cows are mainly housed in naturally ventilated dairy barns with large openings, connected directly to the ambient, turbulent weather conditions
Summary
Compost bedded pack (CBP) barns represent a relatively new loose housing system for dairy cows able to improve cow comfort [1,2]. These facilities are similar in many aspects to typical free-stall dairy barns. Both types of buildings have feed mangers, feed alleys and waterers. The main difference is that in CBP barns the area occupied by free-stalls and free-stall alleys is replaced with a bedded pack. The bedding is generally aerated twice a day using appropriate equipment to dry the surface and incorporate manure into the pack [3]
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