Abstract
A reduced order transient model of a two-zone variable air volume (VAV) system with variable chilled-water flow is developed. The system consists of two environmental zones, a cooling and dehumidifying coil, a chiller and storage tank, a fan, ductwork, a pump and piping system. The model is capable of simulating the fan speed, variable air flow rates and static pressure in the duct system, the pump speed, variable chilled water flow rates in the piping system, heat and mass transfer processes occurring in the coil; environmental zones; chiller plant; and the air distribution system. A total of 32 nonlinear time varying equations are used to describe the dynamics of the VAV system. The developed model is used to simulate various Energy Management Control (EMC) functions. Results showing the VAV system operation during start-up, night time reduced capacity fan operation and day time duty cycling are given.
Published Version
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