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Session: System design and optimization V
Session starts: Tuesday 08 October, 14:00
Presentation starts: 14:00
Room: Ruys & Rijckenvorsel Zaal

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Mario Gaia (Turboden)
Claudio Pietra (Turboden)

Abstract:
In a subcritical ORC, fed by a liquid stream, the presence of a Pinch Point causes that even a large increase of thermal exchanger surface does not involve a significant increase in thermal power subtracted from the heat source. A number of solution like adopting hypercritical cycles, multiple evaporation levels or zeotropic mixtures as working fluid can be used to reduce the exergy loss associated with thermal exchange. Here an alternative solution called by the authors Pinch Point Smoothing is presented, consisting in heating a fraction of the working fluid flow at lower pressure and compressing it to turbine inlet pressure. The solution features are analyzed for a number of working fluids and cycle organization.