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Dual-fan, dual-duct air-handling units introduce outside air directly into the cooling duct and use two variable speed devices to independently maintain the static pressure of the hot and the cold air ducts. Analytical models have been developed to compare fan power and thermal energy consumption of dual-fan, dual-duct constant volume air-handling units with single-fan, dual-duct constant volume air-handling units. This study shows that the dual-fan, dual-duct system uses less fan power and less thermal energy during winter and uses more thermal energy during summer. Thermal energy performance can be significantly improved if the thermal energy penalty can be decreased or eliminated.

Units: Dual

Citation: ASHRAE Transactions, vol. 108, pt. 2