Heat transfer enhancement was investigated numerically on the surface of a refrigerator by using Al2O3 nano-refrigerants, where nanofluids could be a significant factor in maintaining the surface temperature within a required range. The  addition of nanoparticles to the refrigerant results in improvements in the thermophysical properties and heat transfer characteristics of the refrigerant, thereby improving the performance of the refrigeration system. Stable nanolubricant has been prepared for the study. The experimental studies indicate that the refrigeration system with nano-refrigerant works normally. It is found that the freezing capacity is higher and the power consumption reduces by 11.5 % when POE oil is replaced by a mixture of mineral oil and Aluminium oxide nanoparticles. Thus using Aluminium oxide

nanolubricant in refrigeration system is feasible. 

Abstract is taken from International Journal of Computational Engineering Research||Vol, 03||Issue, 4||

April||2013|| Page 42

Heat transfer enhancement in domestic refrigerator using

R600a/mineral oil/nano-Al2O3 as working fluid

1,R. Reji Kumar ,2,K. Sridhar ,3,M.Narasimha

compression systems used in air conditioning and refrigeration systems to take advantage of nanoparticles. Prior work has already shown that using nanoparticles is an excellent method to improve heat transfer in water, ethylene glycol, and engine oil applications. This invention is a method and apparatus for using nanofluids that will increase the heat transfer in the condenser of vapor compression systems; thereby, reducing power consumption. The system uses nanoparticles in the condenser to increase heat transfer and reduce the condensing pressure thereby saving energy.

Patent: US 20120017614 A1

It has been shown that nanofluids (nanoparticle suspension) containing a small amount of metallic or non-metallic particles, such as Al2O3, CuO, Cu, SiO2, TiO2, have increased thermal conductivity compared with the thermal conductivity of the base fluid. Thermal conductivity of nanofluids depends on factors like nanoparticle volume fraction, size, shape, material, base fluid and temperature. Enhancement in thermal conductivity help nanofluids to be used in heat transfer and dissipation applications.

Following references will help U...

Xiang-Qi Wang, Arun S. Mujumdar, Heat transfer characteristics of nanofluids: a review, International Journal of Thermal Sciences 46 (2007) 1–19

Yimin Xuan , Qiang Li, Heat transfer enhancement of nanofluids, International Journal of Heat and Fluid Flow 21 (2000) 58±64

thanks bro

Heat transfer enhancement was investigated numerically on the surface of a refrigerator by using Al2O3 nano-refrigerants, where nanofluids could be a significant factor in maintaining the surface temperature within a required range. The  addition of nanoparticles to the refrigerant results in improvements in the thermophysical properties and heat transfer characteristics of the refrigerant, thereby improving the performance of the refrigeration system. Stable nanolubricant has been prepared for the study. The experimental studies indicate that the refrigeration system with nano-refrigerant works normally. It is found that the freezing capacity is higher and the power consumption reduces by 11.5 % when POE oil is replaced by a mixture of mineral oil and Aluminium oxide nanoparticles. Thus using Aluminium oxide

nanolubricant in refrigeration system is feasible. 

Abstract is taken from International Journal of Computational Engineering Research||Vol, 03||Issue, 4||

April||2013|| Page 42

Heat transfer enhancement in domestic refrigerator using

R600a/mineral oil/nano-Al2O3 as working fluid

1,R. Reji Kumar ,2,K. Sridhar ,3,M.Narasimha

You can ask Dr.Godson ([email protected]), Dr.Jawahar ([email protected]) for more information on your query

It is very important to have a stable solution of refrigerant -nano particles.The problem with Nano fluids is that the nano-particles start settling down as the time progresses.Therefore,we must conduct a stability test for the Nano Fluid before doing our experiments .