An experimental and theoretical study of a jet-pump refrigeration system designed using a new two-dimensional model for the entrainment region of the ejector

Abstract

The performance of an ejector refrigeration cycle is investigated both theoretically and experimentally. By applying the equations for the conservation of mass, energy, and momentum as well as that for the exergy balance, for each component in the cycle, a new two-dimensional thermodynamic model is developed. The influence of flow viscosity is taken into account by assuming a two-dimensional flow near the ejector inner wall. Results indicate that the cycle coefficient of performance decreases with increasing generator temperature and the second law efficiency increases with increasing evaporator temperature and/or decreasing generator temperature. It is found that the maximum relative error occurred in calculating the entrainment ratio is 7.52%. Exergy analysis revealed that the ejector has almost the highest contribution in the total exergy destruction. In addition, increasing the evaporator temperature from 2 to 15.5 C results in a decrease in ejector exergy destruction by up to 8%.

Numerical Optimization of an Ejector for Waste Heat Recovery Used to Cool Down the Intake Air in an Internal Combustion Engine

“…Both experimental, numerical and analytical studies comprise the main development methodologies. Studies concerning the jet-ejector design (Dong et al, 2016;Jia and Wenjian, 2012;Ruangtrakoon et al, 2013;Wang et al, 2017;Yan et al, 2012;Zhu et al, 2009) and modeling (Soroureddin et al, 2013) are quite common in the literature. Many research papers have been focused on studying fundamental phenomena occurring inside the jet-ejector since it is the basis for improving the entrainment process (Ruangtrakoon et al, 2013;Sargolzaei et al, 2010;Jiang, 2014a, 2014b).…”