Abstract
Proper ventilation in dairy barns is important in the summer as high temperatures and the accompanying heat stress can affect the health of the livestock. Although, high speed fans have been in use for a long time to cater to the needs of cooling, HVLS (High Volume Low Speed) fans have proved to be worthy of attention. The cooling effect of the large diameter HVLS fans were compared with that of high speed conventional drum fans in a simulated space using CFD models of the setups at their respective high rotational speeds. This particular work employs MRF (Moving Reference Frame) technique within the CFD simulation. The performance of both these setups were analysed at different heights and distances in order to meticulously compare the performance of the two setups more accurately. The air velocities from the HVLS fans were only slightly less than the high speed drum fans at a distance of 1 m while at increasing distances, the HVLS fan remained more effective than the high speed fans. Also, the HVLS fans covers larger area with more uniform airflow than the high speed fans.
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