Performance characteristics of the ejector refrigeration system based on the constant area ejector flow model

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

“…9 for the same operating conditions. The optimum theoretical results were determined for three different efficiencies of ejector elements, using the methods provided in literature (Yapıcı and Ersoy, 2005). To obtain these theoretical results, efficiencies of the supersonic nozzle and diffuser were kept constant at the values shown in Fig.…”

“…Studies carried out to increase their efficiencies are generally on a better design of ejector, the selection of a proper refrigerant, the optimization of operating conditions and the addition of various (secondary) devices such as a pre-cooler and regenerator to the refrigeration cycle. Scientists have densely studied on these research subjects for several decades and have achieved a significant improvement in the coefficient of performance of the systems using one or more methods (Chang and Chen, 2000;Huang et al, , 2006Eames, 2002;Nahdi et al, 1993;Selvaraju and Mani, 2006;Eames et al, 1999;Cizingu et al, 2001;Lu et al, 1988;Chunnanond and Aphornratana, 2004;Yapıcı and Ersoy, 2005;Sun and Eames, 1996;Ersoy, 1999;Hamner, 1978;Yapıcı, 2008). Chang and Chen (2000) used a petal nozzle to enhance the performance of a steam-jet refrigeration system.…”

“…Optimum operating conditions of these systems mainly change depending upon the ejector area ratio (Nahdi et al, 1993;Yapıcı and Ersoy, 2005;Sun and Eames, 1996). In other words, when operating temperatures or pressures were determined based on practical considerations such as heat source, refrigerated medium and heat rejected medium temperatures, an ejector should be designed so that its area ratio and nozzle position are optimum for the selected operating conditions.…”

“…All experimental curves showing variations in COP against the generator temperature were totally presented on a graph and the optimum performance curve was generated as a function of the temperature. Moreover, the optimum experimental results were compared with the optimized analytical results obtained for the same refrigerant by using the ejector flow model given in the literature (Yapıcı and Ersoy, 2005).…”

“…In this model, inlet to the mixing chamber is with roundedentry, the mixing chamber is of constant-area and the diffuser is conical. The ejectors were designed based on the constantarea ejector flow model given in the literature (Yapıcı and Ersoy, 2005;Ersoy, 1999). The configurations and dimensions of the six ejectors used in the experiments are presented in Table 1.…”