Experimental investigation of the improvement potential of dual evaporator based refrigeration system equipped with two-phase ejector

This paper proposes an experimental investigation of the improvement potential of the dual evaporator based ejector expansion refrigeration system (DEERS). The major purpose is to demonstrate the key improvement potential over the conventional dual-evaporator based vapour compression refrigeration system (DEVRS). An alternative one-dimensional design model based on the homogeneous-equilibrium model (HEM) is proposed to predict the mass flow rate in which the mixture density is determined by the combinations of the void fraction and dryness fraction. Validations of the predicted results with the experimental results are performed to ensure the correctness of the designed model. The impact of the cooling temperature on the performance is investigated and discussed experimentally, and the relative error of 2.0 %-5.6 % is found for predicting the mass flow rate, while the entrainment ratio is around 5.6 %-11.6 %. Experimental findings show that the DEERS produces a much higher cooling capacity at the evaporator#1. The percent improvement is around 16 %-42 % depending on the working conditions. The electricity consumption of both systems is similar under the same working conditions. The COP of the DEERS is higher throughout the investigated range of the cooling temperatures. The percent improvement of the COP is 14 %-30 %.