ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-469-4
ISBN Online: 978-1-56700-470-0
Second Thermal and Fluids Engineering Conference
AN EXPERIMENTAL STUDY OF VAPOR EJECTORS WORKING WITH R245FA
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.