study of ORC with the expansion process twin screw machines

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Figure 28 Schematic ORC system layout for the simulated case Problem definition: Generating a good design for an overall ORC power plant, maximising annual profit or power output or minimising capital cost while satisfying the given design constraints. The optimisation problem is subject to constraints, which can be physical or logical constraints. The former includes constraints like mass and energy balances, minimum temperature difference and the capacity limits of equipment. Most of these constraints can be modelled using continuous variables. The logical constraints represent structural and operability issues and involve binary variables. Interactivity: The major subsystems of an ORC power plant include the heat exchanger systems, expander and pumps. These are strongly interlinked. This interconnectivity makes it difficult to decompose the design problem into separate sub problems without sacrificing the solution quality. For best results, all the subsystems must be optimised simultaneously, but this will inevitably increase the size of the problem, and hence the difficulty of solving it. Thermodynamic data: One of the challenges in building optimisation models for ORC plants is the modelling of thermal properties of fluids. This problem is greatly simplified by employing REFPROP version 8 property routines. 42

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