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

Abstract

SUMMARYThe 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.

Ejector refrigeration: A comprehensive review

“…Bilir and Ersoy [159,305] studied the performance improvement of EERS over the standard cycle using the R134a refrigerant: the COP was found to increase by 10.1-22.34%, and the reduction in exergy destruction was found to be up 58.7%. The COP improvement increases with T c .…”

Energetic and Exergetic Analysis of an Ejector-Expansion Refrigeration Cycle Using the Working Fluid R32

“…Nehdi et al [14] numerically discovered that replacing the throttle valve with a two-phase ejector improved COP up to 22% in a vapor compression system using R141b as refrigerant. Bilir and Ersoy [15] found theoretically that an EEC using R134a could provide 22.3% COP improvement compared with that of basic cycle. Disawas and Wongwises [16] and Wongwises and Disawas [17] presented experimental results comparing an EEC to the basic cycle using R134a as the refrigerant.…”

Experimental Investigation of Ejector-Expansion Refrigeration System Using Refrigerant R-134a

“…The minimum COP improvement ratio in the investigated field was 10.1% while its maximum was 22.34%. [8].…”

“…EJECTOR DESIGN Ejector is designed on the basis of design procedure published in the open literature [8], [9]. Ejector has three important parts such as motive nozzle, the suction nozzle, and the mixing section.…”