Experimental Analysis of Vapour Compression Refrigeration System using Nanorefrigerant
Aiming to improve the characteristics of the traditional refrigerants, nanofluid is a new invention to enable vapor
compression systems to take advantage of nanoparticles. Recent studies shows that use of nanoparticles in refrigeration
systems leads to remarkable improvement in thermophysical properties and heat transfer capabilities, thus enhances the
efficiency and reliability of refrigeration and air conditioning system. Refrigerant based nanofluids are termed as
nanorefrigerants. They have the potential to enhance the heat transfer performances of refrigeration and air-conditioning
systems. The present work deals with the investigation on a vapour compression refrigeration system with pure R134a and
R134a with different nanoparticles concentration added to it. Stable nanolubricant has been prepared with VG68 polyolester
oil for the study. Three different mass concentration 0.04%, 0.06% and 0.08% of Al2O3 nanoparticles with 20 nm. size has
been used. The system performance was investigated using energy consumption test and freeze capacity test. The results
indicate that refrigeration system with nanorefrigerant works normally and safely. It is found that the freezing capacity is
higher and power consumption reduces by 14.71% and the coefficient of performance increases by 28.93%, when Al2O3
nanolubricant is used with 0.06% mass fraction giving optimum results.
Index terms - Nanofluids, Nanorefrigerant, Nanolubricant, Nanoparticles, Heat transfer, Al2O3.