Heat Transfer Characteristics of Al2O3 Based Nano refrigerants in The Evaporator and Condenser of Vapor Compression Refrigeration Systems
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The performance and energy consumption of the vapor compression refrigeration system
(VCRS) is influenced by the rate of heat transfer between the system and its environment.
Two-phase flow, boiling with heat transfer occur within the evaporator and the condenser of
the VCRS. The improvement in two-phase flow, boiling and heat transfer coefficient in these
components using nano refrigerants possess the propensity to increase the system’s
performance and energy efficiency and reduces the energy carbon footprint of the system.
The influence of nanoparticle concentration of aluminum oxide (Al 2 O 3 ) on the two-phase
flow heat transfer in the condenser and the evaporator using R134a and R600a refrigerants
in the VCRS was analyzed in this study. The ANSYS fluent software was employed to
model and analyze the process in the condenser and evaporator. The result obtained
showed that convective heat transfer of pure R600a and Al 2 O 3 /R600a nano refrigerants
was higher than that of pure R134a and Al 2 O 3 /R134a nano refrigerants. The Prandtl and
Nusselt numbers decreased as the nanoparticle concentration increased. Thermal diffusion
was more prominent than the momentum diffusion as the temperature increased, despite
the increase in the nanoparticle concentration. The numerical simulation results established
that the convective heat transfer coefficient, Nusselt number and Prandtl number of the
nano refrigerant depends on the mass concentration of nanoparticles.
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology