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Effects of control strategy, size of heating/ventilation equipment and controller time constant on thermal responses and supplemental heat use for a livestock building



Effects of control strategy, size of heating/ventilation equipment and controller time constant on thermal responses and supplemental heat use for a livestock building



Livestock Environment IV Proceedings of a conference held in Coventry, UK, 6-9 July 1993: 347-355



Thermal responses and supplemental heat consumption of a livestock building airspace using 3 different control strategies, either-or-temperature (EOT), either-or-neither-temperature (EONT) and temperature-humidity-control (THC) controls, and using different sizes of heating/ventilating equipment and different controller time constants, were simulated under actual Canadian Prairie typical meterological year weather data of 2 typical days: a cold day (-23 to -32 degrees C) and a warm day (-4 to 7 degrees C). Thermal response and heat consumption were affected by control strategies. Oversize of heating/ventilating equipment resulted in both poor thermal response and energy consumption for EO and EONT systems but had little effect on THC system. Controllers with large time constants may save supplemental heat but introduced poor thermal responses for all 3 control strategies.

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