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    Investigation of ejector entrainment ratio and condenser temperature effect on performance parameters of the experimental refrigeration system using dual evaporators and a single compressor with R515A refrigerant
    (İdris Karagöz, 2023) İşkan, Ümit; Çetin, Gizem; Kahraman, Mahmut Cüneyt; Direk, Mehmet
    In this paper, the effects of ejector entrainment ratio (ER) and condenser temperature on performance parameters such as COP, cooling capacity, etc. were investigated in an experimental refrigeration system using a single compressor with R515A refrigerant and two evaporators that can operate at different temperatures. An extra expansion valve and mixing chamber are necessary to ensure pressure balance in the two evaporator refrigeration systems. Alternatively, the ejector can be utilized instead of these two pieces of equipment and can provide the required cooling capacity. The experimental test system has two evaporators at two different evaporation temperatures and an expansion valve before each evaporator. First tests were carried out by altering the ER and it was observed that when ER increased from 0.2 to 0.8, the total cooling capacity and COP values dropped by 18% and 15%, respectively. When ER value was adjusted to range of 0.5-0.6, the cooling capacities of the two evaporators were closest to each other. Second tests were carried out by changing the condenser temperature but with a constant ER value (between 0.5-06); the results showed that as the condenser temperature increased from 28 °C to 43 °C, the total cooling capacity increased by 11% and the COP value dropped by 23%.