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Session: System design and optimization IV
Session starts: Tuesday 08 October, 11:20
Presentation starts: 12:20
Room: Ruys & Rijckenvorsel Zaal

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Emeline Georges ()
Ian Bell ()
Brandon Woodland ()

Abstract:
Brazed plate heat exchangers present different characteristics that make them suitable for use in ORC systems. The main advantages are the minimal risk of internal leakage, the compact design, efficient heat transfers in both single-phase and two-phase applications, controllable pressure drops and easy maintenance. They are commonly used as the evaporator, condenser or regenerator in Organic Rankine Cycles (ORC). The present paper presents a unique solution technique implemented to solve moving boundaries brazed plate heat exchanger models (Bell, 2011). This solution technique allows one model to solve for the full range of steady state operating conditions possible in the heat exchanger. This includes the most complex case involving phase-change in both fluids. The model is validated with a set of points obtained experimentally for an ORC working with R134a as working fluid. Agreement within 3% error was found when comparing the heat transfer rate at the condenser estimated by the model to the one obtained experimentally.