Advanced Organic Rankine Cycle for geothermal application

Markus Preiszinger, Florian Heberle and Dieter Brüggemann

International Journal of Low-Carbon Technologies, 2013, vol. 8, issue suppl_1, i62-i68

Abstract: Exploitation of geothermal sources based on advanced Organic Rankine Cycle (ORC) is studied with respect to energetic, plant-specific and economic aspects. Three natural and five synthetic refrigerants are investigated as pure fluids within a sub- and transcritical ORC. Furthermore, a zeotropic mixture of R227ea/R245fa is analysed under subcritical conditions. It is shown that transcritical ORC is a promising way to optimize geothermal power plants. The gross power can be increased by >15% compared with standard subcritical processes. Economic analysis indicates that transcritical ORC as well as zeotropic mixtures lead to significantly lower payback periods and, even when taking into account higher specific investment costs and higher mean cash flow. Copyright , Oxford University Press.

Date: 2013
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