Vapour compression refrigeration (VCR) system has maximum COP and widely used system all round the world. Due to hazardous chlorine content in HFC refrigerants, which deplete ozone layer, various attempts were made by HVAC engineers to replace the freons with alternate refrigerants. The present scope of the paper is to prepare an azeotropic solution with R600a, agglomerated with composite of TiO2 and CuO of size less than 100 Nm in size. The operating pressures, temperatures of low pressure and high-pressure regions were discussed with R600a, R600a with nano composition. The experiments were performed on existing VCR system with dual refrigerant test capacity. The COP of VCR system using R600a agglomerated with nano composites tested for various cap¬illary lengths are reported. It was observed that due to enhancement of thermal conductivity of the R600a with nano composites, the COP of the VCR system has increased and the system worked stable at elevated condenser temperatures.

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