In this paper, energy and exergy based analysis on cascade vapour compression refrigeration system (CVCRS) with Au-CNT, Ag-CNT and HAuCl4-CNT composite nanoparticles were performed. Au-CNT, Ag-CNT and HAuCl4- CNT composite nanoparticles were suspended using two step method with polyalkylene glycol which was used as lubricant. First and second law of thermodynamics were applied to investigate energetic and exergetic performance of CVCRS six composite nanoparticles combination such as Au-CNT, Ag-CNT and HAuCl4-CNT with 0.2% Au and 0.025% CNT, 0.2% Au and 0.05% CNT, 0.2% Ag and 0.025% CNT, 0.2% Ag and 0.05% CNT, 0.2% HAuCl4 and 0.025% CNT, 0.2% HAuCl4 and 0.05% CNT volume percentages. R134a was used as refrigerant in low temperature circuit (LTC) and high temperature circuit (HTC) for experimentation. The energy and exergy analysis based on experimental results show that for the composite nanoparticles 0.2% Au and 0.05% CNT volume percentage, the evaporator cooling time required and work input to LTC and HTC compressors and exergy losses of components and system are lowest. For 0.2% Au and 0.05% CNT, the actual COP of 3.205, refrigeration efficiency of 49.2% and exergy efficiency of 17.8% are maximum compared to other nanoparticles combination.
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