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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

AN EXPERIMENTAL STUDY OF VAPOR EJECTORS WORKING WITH R245FA

Jianyong Chen
School of Material and Energy, Guangdong University of Technology, Guangzhou, 510006, China

Hans Havtun
Department of Energy Technology, Royal Institute of Technology (KTH), Stockholm, Sweden

Björn Palm
Royal Institute of Technology (KTH); Department of Energy Technology, Brinellvagen 60,100 44 Stockholm, Sweden

Ying Chen
School of Material and Energy, Guangdong University of Technology, Guangzhou, 510006, China

Abstract

The vapor ejector is the key component in the ejector refrigeration system. The ejector determines the working stability and performance of the whole system. A specific test rig was designed and built with a focus on the performance of ejector itself. Instead of a circulation pump and a generator in the ejector refrigeration system, a compressor was used as the driving source. R245fa was selected as the working fluid. The important parameters, like pressure, temperature and mass flow rate, were measured and recorded. The entrainment ratio was obtained at a maximum value of 0.28. It was found that using ideal gas law and an appropriate value of the ejector nozzle isentropic efficiency could provide reasonable predictions of the mass flow rate through the ejector nozzle. Moreover, the insignificant impact of the superheat of the secondary flow on entrainment ratio was verified.

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