Specific Consumption Analysis of Vapor Compression Refrigeration System

In real life applications the latest findings of energy savings are playing important role for optimizing and improving the systems. Vapor compression refrigeration systems are some of the most implemented refrigeration systems and most of the energy consumption in this area depends on this system. The power consumption of VCR systems cannot be obtained or compared only with the COP. In order to alleviate the above challenges, a temperature-entropy diagram of actual compression refrigeration cycle is designed to show the differences between the actual and theoretical refrigeration cycles in this research. Second law of thermodynamics was utilized to analyze the entropic and exergy balance of irreversible factors during the refrigeration process. Then specific consumption analysis model of VCR is proposed and specific consumption of specific refrigeration capacity is studied. The proposed method can obtain the actual specific consumption and distribution of the additional specific consumption. Numerical results have shown that the exergy efficiency of the VCR is lower than the COP due to high entropy generation (irreversible losses) because of electricity consumed by the system. An alternative method is introduced for the evaluation of the energy saving potential in VCR system.