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International Journal of Mechanical and Industrial Engineering

Abstract

Convective heat transfer is very important in the HVAC, refrigeration and microelectronics cooling applications. R134a is most widely adopted alternate refrigerant in refrigeration equipment, such as domestic refrigerators and air conditioners. Though the global warming up potential of R134a is relatively high, it is affirmed that it is a long term alternate refrigerants in lots of countries. The addition of nanoparticles to the refrigerant results in improvements in the thermophysical properties and heat transfer characteristics of the refrigerant, there by improving the performance of the refrigeration system. The performance of the domestic refrigeration system with HFC134a/mineral oil system was compared with mineral oil/nanorefrigerant and HFC134a/mineral oil/double pipe heat exchanger. The result indicates that the system performance has improved when HFC134a/mineral oil/DPHE system was used instead of HFC134a/mineral oil and mineral oil/nano refrigerant system. The mineral oil/nano refrigerant and HFC134a/mineral oil/DPHE works normally and safely in the refrigeration system. The HFC 134a/mineral oil/DPHE system reduced the energy consumption by 30% and mineral oil/nano refrigerant system reduced the energy consumption by 26 % when compared with the HFC134a/mineral oil system. There was also an enhancement in coefficient of performance (COP) when DPHE was introduced in the normal system.

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