A pressure-exchange ejector and different nozzle structures were presented in order to get better efficiency for the mixing process (Chen et al., Citation2015 Hong et al., Citation2004). The effective ejector performance optimization could be done easily by having a movable spindle or using a movable nozzle.
The coefficient of performance (COP) of the system could be affected by the nozzle position (Aphornratana & Eames, Citation1997), geometric parameters, and cooling capacity (Sriveerakul et al., Citation2007b Wu et al., Citation2014 Zhu et al., Citation2009 Wang et al., Citation2017) the operation could be fine-tuned adaptably using a spindle of an ejector to alter the nozzle’s area of the primary throat (Ma et al., Citation2011 Pereira et al., Citation2014).
The geometric structure of an ejector has an effect on its performance considerably. The important factors affecting the optimum performance of ejector systems are the system conditions and ejector structures (Tashtoush et al., Citation2019). They can replace mechanical compressors or can be combined with mechanical compressors in refrigeration systems (Keerlatiyadatanapat et al., Citation2017).Įjectors are well known for their versatility and diversity and are utilized in refrigeration technologies. Ejectors are inexpensive devices that can operate using energy sources, for example, solar collectors or heat rejected from industrial processes. Therefore, to avert an energy crisis, it is necessary to conserve energy or reduce its consumption by enhancing the efficiency of refrigeration systems through ejector installation. Refrigeration and air conditioning are applications consuming considerable amounts of energy. At present, the global energy situation is critical because the current demand for energy in various fields is increasing steadily and rapidly.
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