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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Deng Pan (Tongji University , College of Mechanical Engineering)
Naiping Gao (Tongji University , College of Mechanical Engineering)
Feibo Xie (Tongji University , College of Mechanical Engineering)
Tong Zhu (Tongji University , College of Mechanical Engineering)
Hai Wang (Tongji University , College of Mechanical Engineering)
Haiying Wang (Tongji University , College of Mechanical Engineering)
Wei An (Tongji University , College of Mechanical Engineering)

Abstract:
The performance of a scroll expander modified from compressor was tested in an organic Rankine cycle (ORC) system. The ORC system mainly consisted of evaporator, scroll expander, plunger pump and condenser. The test rig employed R123 as working fluid. A natural gas burner was employed as the heat source whose flue-gas temperature was about 250℃. The performance of the scroll expander was investigated under different pump capacity and different electric loads. The maximum output power of the expander was 2.56kw and the maximum isentropic efficiency was 78.75% under the testing conditions. The evolutions of output power and isentropic efficiency with the pressure ratio and rotation speed were obtained. In the second part, a 2-D model was established to simulate the working process of the scroll expander by the approach of computational fluid dynamics (CFD). The pressure distribution in the scroll expander and its variation with the crank angle were analyzed.