Abstract
AbstractSystem simulation with equation based and object-oriented modelling languages has become an important tool for system and control design of vapour compression cycles. A common approach of modelling one-phase and two-phase fluid flow is 1-D spatial discretisation according to the Finite Volume Method. In order to avoid stiff systems and to speed up simulation, pressure loss and momentum balance are usually handled in a simplified way. There exist different approaches. But all approaches suffer from one drawback. There are points where the resulting set of equations is not solvable and simulation fails. In this contribution the solvability problem is analysed in detail. It is shown that these problems are closely connected to fluid properties. Based on this result a modelling approach is suggested to avoid singularities.
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