MODELING OF THE SINGLE COIL, TWIN FAN AIR-CONDITIONING SYSTEM IN ENERGYPLUS
Clayton Miller, Chandra Sekhar
This paper outlines the conceptual development of a building energy simulation model for the Single Coil, Twin Fan Air Conditioning (SCTF) system in the whole building simulation program EnergyPlus. The SCTF system is a unitary, multi-zone system which conditions the outdoor ventilation and recirculated return air in two separate streams through a single compartmented cooling coil and supplies these unmixed streams via two variable speed fans and a dual duct arrangement to zonal mixing boxes. The main challenges addressed in EnergyPlus include the existing inability to concurrently simulate unmixed air streams within a centralized VAV system, supply and control outdoor air and recirculated air independently to a space via dual duct network, and prediction of performance of a compartmented cooling coil – all of which have potential applications in other innovative systems.
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