Performance improvement of the vapour compression refrigeration cycle by a two-phase constant area ejector

The performance of a vapour compression system that uses an ejector as an expansion device was investigated. In the analysis, a two‐phase constant area ejector flow model was used. R134a was selected as the refrigerant. According to the obtained results, for any operating temperature there are diffe...

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Bibliographic Details
Published in:International journal of energy research 2009-04, Vol.33 (5), p.469-480
Main Authors: Bilir, Nagihan, Ersoy, H. Kursad
Format: Article
Language:English
Subjects:
Applied sciences
COP
Devices using thermal energy
ejector
Energy
Energy. Thermal use of fuels
Exact sciences and technology
expansion valve
Heat exchangers (included heat transformers, condensers, cooling towers)
off-design
optimum performance
Refrigerating engineering
Refrigerating engineering. Cryogenics. Food conservation
Techniques. Materials
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Summary:The performance of a vapour compression system that uses an ejector as an expansion device was investigated. In the analysis, a two‐phase constant area ejector flow model was used. R134a was selected as the refrigerant. According to the obtained results, for any operating temperature there are different optimum values of pressure drop in the suction chamber, ejector area ratio, ejector outlet pressure and cooling coefficient of performance (COP). As the difference between condenser and evaporator temperatures increases, the improvement ratio in COP rises whereas ejector area ratio drops. The minimum COP improvement ratio in the investigated field was 10.1%, while its maximum was 22.34%. Even in the case of an off‐design operation, the performance of a system with ejector is higher than that of the basic system. Copyright © 2008 John Wiley & Sons, Ltd.
ISSN:0363-907X
1099-114X
DOI:10.1002/er.1488