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Improving Commercial Broiler Attic Inlet Ventilation through CFD Analysis

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2012 IX International Livestock Environment Symposium (ILES IX)  ILES12-1382.(doi:10.13031/2013.41565)
Authors:   Jonathan W.W Olsen, Jeremiah D Davis, Joseph L Purswell, Brian D Luck
Keywords:   Poultry, Energy Efficiency, Attic, Solar, Ventilation, CFD

The use of solar heated attic air is an area of increasing interest in commercial poultry production. Attic inlets satisfy the demand for alternative heating while being simple to implement in an existing poultry house. A number of demonstration projects have suggested that attic inlets may decrease the amount of fuel required to raise minimum ventilation air to set point temperature by tempering the inlet air. However, little attention has been given to the configuration of the attic space and its influence on thermal energy extraction. The objectives of this study were as follows: 1) Collect data for the operation of attic inlets in a commercial broiler house, 2) develop a two-dimensional computational fluid dynamic (CFD) simulation model using experimental data, and 3) Use the simulation to investigate the efficiency of attic inlet system configurations. Field data collected during the operation of attic inlets in an east-west oriented broiler house illustrated the asymmetric heating and stratification of air temperature. A two dimensional CFD simulation model was developed for attic inlet system operation using field data to develop boundary conditions. The simulation demonstrated that the strategic placement of a simple 2.44 m ridge cap diverter and a central inlet riser (1.3 m high) may increase thermal energy extraction by 55% and 68% (30 s and 60 s fan runtimes, respectively) over the measured attic inlet system.

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