Cascaded superheat control with a multiple evaporator refrigeration system
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Variable refrigerant flow (VRF) systems are increasingly being used in commercial buildings in preference to chilled water or ducted air systems. The closely coupled dynamics of VRF systems, however, create a need for effective control strategies to ensure safe and effective operation. Of particular interest is the regulation of evaporator superheat. In this paper a cascaded architecture for controlling superheat is applied to a multiple evaporator system, and compared to traditional PID-controlled evaporators. The effects of the architecture on dynamic coupling are explored, and efficacy is demonstrated with experimental results. © 2011 AACC American Automatic Control Council.
author list (cited authors)
Elliott, M. S., Estrada, C., & Rasmussen, B. P.