Experimental investigation, model validation and application of twin-screw expanders with different built-in volume ratios

Fabian Dawo, Sebastian Eyerer, Roberto Pili, Christoph Wieland and Hartmut Spliethoff

Applied Energy, 2021, vol. 282, issue PA, No S030626192031552X

Abstract: Organic Rankine Cycles (ORC) are a promising technology to generate power from low temperature heat sources and can therefore help transform current energy systems into renewable ones. However, ORCs are often affected by a wide range of operating conditions with a high share of part load operation. Therefore, detailed component models are necessary for the design of these ORC modules. In this study, systematical experimental investigations were conducted on two identical twin-screw expanders with different built-in volume ratios. The expander measurements covered the entire operational range of the ORC test rig and the expander by methodically varying rotational speed, mass flow, inlet pressure and superheating at constant expander outlet pressure. The experimental data is then utilized to validate a semi-empirical model of the twin-screw expander. Subsequently, the validated expander model is used to determine the optimum built-in volume ratio of an expander supplied by a wide range of heat source temperatures and mass flows and fluctuating heat source mass flows.

Keywords: Organic Rankine Cycle (ORC); Twin-screw expander; Modeling; Experimental validation (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (9)

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DOI: 10.1016/j.apenergy.2020.116139

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