Reference : Experimental investigation and optimal performance assessment of four volumetric expa...
Scientific journals : Article
Engineering, computing & technology : Energy
http://hdl.handle.net/2268/227372
Experimental investigation and optimal performance assessment of four volumetric expanders (scroll, screw, piston and roots) tested in a small-scale organic Rankine cycle system
English
Dumont, Olivier mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques >]
Parthoens, Antoine mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques >]
Dickes, Rémi mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques >]
Lemort, Vincent mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques >]
2018
Energy
Elsevier
Yes (verified by ORBi)
International
0360-5442
United Kingdom
[en] Modeling ; Experimental ; Scroll ; Screw ; Piston ; Roots ; Volumetric ; Expander ; ORC
[en] The aim of this paper is to facilitate the selection of the expander for a small-scale organic Rankine cyclebased on an experimental comparison of a piston, a screw, a scroll and a roots expander. First, based on aliterature review, a comparison between these four technologies of volumetric expansion machines isperformed. Afterward, four displacement expanders [2e4 kW] are tested on two similar small-scale ORCunit withfluid R245fa. The maximum effective isentropic efficiencies measured are 53% for the pistonexpander and the screw expander, 76% for the variable-speed scroll and 48% for the roots machine.However, these performances do not reflect the highest efficiencies achievable by each expander: thetest-rig presents experimental limitations in terms of massflow rate and pressure drop (among others)that restricts the achievable operating conditions. The calibration of semi-empirical models based on themeasurements allows to overcome this issue and to predict the isentropic efficiency in optimal condi-tions despite the limitations of the test-rigs. Based on experimental results, extrapolated prediction ofthe semi-empirical model and practical considerations, some guidelines are drawn to help the reader toselect properly a volumetric expander.
http://hdl.handle.net/2268/227372
10.1016/j.energy.2018.06.182

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