Dynamic modeling of a refrigeration system with an internal heat exchanger and dual evaporators through exergoeconomic analysis

In this study exergy and exergoeconomic analyses of a refrigeration system with two evaporators and an internal heat exchanger were performed. The analysis of the whole system included various thermodynamics parameters such as sustainability index, exergetic improvement potential, ratio of the thermodynamic losses(energetic and exergetic losses) to the capital cost, relative irreversibility for each component of the system. Furthermore, the efficiencies for each component were analyzed using two different approaches, one was the net rational efficiency basis and another one was the product/fuel basis. The whole system efficiency on the net rational basis was determined to be 7.24% and on the product/fuel basis it was obtained to be 43.92%. The system has a huge capacity for improvement. The greatest Irreversibility occurs in the compressor with a value of 0.29 kW and the efficiency values for the compressor using both the approaches were found to be 16.9% and 21.57%, respectively.