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Two air inlet control systems for a naturally ventilated swine finishing barn were compared onthe basis oftemperature regulation during winter condi tions . The barn was fitted with continuous above-centre pivot rotating doors in the sidewalls and a continuous ridge opening. The nonmodulated system used thermostats, compressed air cylinders and pistons to totally open orclose the air inlets. The modulated control system used thermostats, a gear motor, and a time delay to step the inlets open and closed in small increments. Results showed that tem perature fluctuations atpiglevel were reduced and temperature across theroomat animallevelwasmoreuniformandgenerallywarmerwith themodulated as compared to thenonmodulated system.
J.A. Munroe, Y. Choiniere and F. Blais 1991. Comparison of a modulated vs nonmodulated control system in a warm naturally ventilated swine barn. Canadian Agricultural Engineering 33(2):335-340.
Canadian Society for Bioengineering