Journal Press India^®

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Now a days nano refrigerants are being considered as a most efficient heat transfer fluids having superior heat transfer properties than conventional refrigerants in various thermal applications. Refrigerant based nano fluid termed as “Nanorefrigerant” have the great potential for improve thing first law thermal performance in terms of coefficient of performance in the refrigeration and air conditioning system. The thermo physical properties by addition of different nanoparticle mixed with eco friendly refrigerant are analyzed and their effects on the coefficient of performance (C.O.P.) have been reported in this paper. The thermal modeling have been done for the same cooling load and same geometry parameter for all nanoparticles and refrigerant combination mixture in the vapour compression refrigeration based chiller system having two concentric tube type heat exchanger as evaporator and condenser. The experimental results are indicating the thermal conductivity, dynamic viscosity and density of nanorefrigerant (different nanoparticle i.e. Cu, Al2O3,CuO and TiO2 with eco friendly refrigerant R134a,R407c and R404A) increased about 15 to 94 %, 20% and 12 to 34 % respectively compared to base refrigerant on the other hand specific heat of nanorefrigerant is slightly lower that the base refrigerant. Moreover Al2O3/R134a nanorefrigerant shows highest C.O.P. of 35%. R404A and R407 with different nanoparticle show enhancement in C.O.P. about 3 to 14 % and 3 to 12 % respectively. Therefore application of nanorefrigerant in refrigeration and air conditioning system is most required to improve the performance of the system.

Keywords

First Law Efficiency Improvement; Energy-Exergy Analysis; Nano Refrigerants; Ecofriendly Refrigerant; Vapour Compression Refrigeration System; Second Law (Exergetic Efficiency) Improvement.

1. L.O.S. Buzelin, S.C. Amicoa, J.V.C. Vargasa, J.A.R. Parise, Experimental development of an intelligent refrigeration system, International Journal of Refrigeration, 28, 2005 165–175


2. Jwo et.al, Effect of nano lubricant on the performance of Hydrocarbon refrigerant system. J. Vac. Sci. Techno. B, 27(3), 2009, 1473-1477


3. Hao Peng et.al., Nucleate pool boiling heat transfer characteristics of refrigerant/oil mixture with diamond nano parti cles. International Journal of Refrigeration, 33, 2010, 347-358.


4. Henderson et al. Experimental analysis on the flow boiling heat transfer of R134a based nanofluids in a horizontal tube, IJHMT, 53, 2010, 944-951.


5. S. Bobbo et.al, Influence of nanoparticles dispersion in POE oils on lubricity and R134a solubility. International Journal of Refrigeration, 33, 2010, 1180-1186


6. Shengshan Bi, Performance of a Domestic Refrigerator using TiO2-R600a nano-refrigerant as working fluid, Int J of Energy Conservation and Management, Vol. 52, 2011, 733-737


7. K Lee, YJ Hwang, S Cheong, L Kwon, S Kim, J. Lee, Performance evaluation of nano-lubricants of fullerene nanoparticles in refrigeration mineral oil. Current Applied Phys 2009, 9:128–31.


8. RX Wang, HB. Xie, A refrigerating system using HFC134a and mineral lubricant appended with N-TiO2 (R) as working Fluids. In: Proceedings of the 4th international symposium on HAVC, Tsinghua University; 2003


9. S.Z. Heris, S.G. Etemad, M.N. Esfahany, Experimental investigation of oxide nanofluids laminar flow convective heat transfer, Int. Commun. Heat and Mass Transfer, 33, 2006, 529535.


10. K Lee, YJ Hwang, S Cheong, L Kwon, S Kim, J. Lee, Performance evaluation of nano-lubricants of fullerene nanoparticles in refrigeration mineral oil. Curr Appl Phys, 2009, 9:128–31.


11. A. Sharma, S. Chakraborty, Semi-analytical solution of the extended Graetz problem for combined electro osmotically and pressure-driven microchannel flows with stepchange in wall temperature, Int. J. Heat Mass Transf. 51, 2008, 4875-4885.


12. W. Yu, D.M. France, D.S. Smith, D. Singh, E.V. Timofeeva, J. L. Routbort, Heat transfer to a silicon carbide/water nanofluid, Int. J. Heat Mass Transf 52, 2009, 3606-3612.


13. S. Torii, W. J. Yang, Heat transfer augmentation of aqueous suspensions of nanodiamonds in turbulent pipe flow, J. Heat Transf. 131, 2009, 043203-1 -043203-5


14. U. Rea, T. McKrell, L.W. Hu, J. Buongiorno, Laminar convective heat transfer and viscous pressure loss of alumina-water and zirconia-water nanofluids, Int. J. Heat Mass Transf. 52, 2009, 2042-2048


15. S. M. S. Murshed, K. C. Leong, C. Yang, Enhanced thermal conductivity of TiO2-water based nanofluids, Int. J. Therm. Sci., 44, 2005, 367–373.


16. R. L. Hamilton, O. K. Crosser, Thermal conductivity of heterogeneous two component systems, I & EC Fundam., 1(3), 1962, 187–191.


17. Y. Xuan, Q. Li, Investigation on convective heat transfer and flow features of nanofluids, J. Heat Transfer, 125, 2003 151–155.


18. C. Sitprasert, P. Dechaumphai, A thermal conductivity model for nanofluid including effect of temperature – dependent interfacial layer, Res 11(6), 2009, 1465-1476


19. H. Brinkman, The viscosity of concentrated suspensions and solution J chem. Physics 20, 1952.


20. B. C. Pak, Y. I. Cho, hydrodynamics and heat transfer study of dispersed fluid with submicron metallic oxide particle Exp. Heat transfer, 11(2), 1998, 151-170