Paper Conference

Proceedings of SimBuild Conference 2010: 4th conference of IBPSA-USA


Dynamic Modeling and Consistent Initialization of System of Differential-Algebraic Equations for Centrifugal Chillers

Pengfei Li, Yaoyu Li, John E. Seem
University of Wisconsin-Milwaukee, Milwaukee, WI
Johnson Controls Inc., Milwaukee, WI

Abstract: For simulation of centrifugal chiller system with differential algebraic equations (DAEs), consistent initial conditions are difficult to obtain due to the two-phase refrigerant cycle and the connections between several components. Existing rigorous initialization methods are generally not suitable for the particular problem of centrifugal chiller simulation. In this paper, the dynamic model of a water-cooled centrifugal chiller is developed in Modelica with Dymola and the TLK/IfT Library (TIL). A direct initialization method is proposed for the consistent initialization for centrifugal chiller. Simulation results have shown the effectiveness of the proposed modeling framework and the initialization method.
Pages: 386 - 393