Experimental determination of the optimum performance of ejector refrigeration system depending on ejector area ratio

A study of working fluids for heat driven ejector refrigeration using lumped parameter models

“…For a fixed-geometry ejector, instead, each ejector with a specific area ratio f has its own optimum T g , at where the maximum COP could be obtained (Selvaraju and Mani, 2006). It is possible to observe that the calculated COP from the model increase nearly linearly with increasing of T g , as reported in literature (Yapıcı et al, 2008). The average changes in performance are reported in Table 4.…”

“…For these reasons, ejector refrigeration systems can be used in buildings, in distributed tri-generation systems and for the waste heat recover from industrial processes (Ben Mansour et al, 2014;Godefroy et al, 2007;Little and Garimella, 2011). Nevertheless, the ejector refrigeration has not been able to penetrate the market because of the low coefficient of performance (Sarkar, 2012): this is because the efficiency of the whole system is highly influenced by ejector performances, which significantly depends on the geometry, working fluid and operating conditions (Kasperski and Gil, 2014;Selvaraju and Mani, 2006;Varga et al, 2009a;Yapıcı et al, 2008). This paper deals with the screening of the working fluids, using a validated lumped parameter model, in the range of operating conditions of low grade energy sources (waste heat and solar energy sources).…”

Ejector refrigeration: A comprehensive review

“…Finally, COP decreased with R c and increased with R d . Yapici et al [145], using R123, theoretically and experimentally determined the optimum for T g and the maximum for COP as a function of ϕ at given evaporator and condenser conditions. COP decreases faster when the T g decreases from the optimal temperature for a given ϕ. Yapici [140], analyzing ejectors with a movable primary nozzle, also observed an improvement of the ejector performance if it is carefully designed and realized.…”

Development and performance of steam ejector refrigeration system operated in real application in Thailand

“…The major weak point of a steam ejector refrigeration system is its low COP compared to an absorption refrigeration system, another most widely used type of heat-power refrigeration system. The reduction of energy consumption and increase in refrigeration production by optimizing the ejector geometries or the system's operating conditions are the goals of improvement for many researchers (Yapıci et al, 2008;Meyer et al, 2009;Chen et al, 2013;Chandra and Ahmed, 2014). The development of the working fluid circulating system of the ejector refrigeration system (Srisastra and Aphornratana, 2005;Srisastra et al, 2007) is also the one option for improving the system performance.…”