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The evaporating heat transfer coefficient increases with the increase of: 1- Heat flux within the range used here 2- CuO nanoparticles concentration ranged from 0.1 to 0.55 % then decreases for all values of heat flux 3- CuO nanoparticles size ranged from 15 to 25 nm then decreases for all values of heat flux. Comparison of the present results with the published data shows reasonable agreement. Fig. 4: Variation of the evaporating heat transfer coefficient with nanoparticle size (G = 100 kW/m2, concentration 0.55 %) 7. References [1] S. U. S. Choi. Enhancement Thermal Conductivity of Fluids with Nanoparticles. ASME Journal.1995, 66: 99-103. [2] S. K. Das, N. Putra, and W. Roetzel. Pool Boiling Characteristics of Nano-Fluids. International Journal of Heat and Mass Transfer. 2003, 46: 851-862. [3] J. Li, D. Liang, K. Guo, R. Wang, and S. Fan. Formation and Dissociation of HFC134a Gas Hydrate in Nano- copper Suspension. Energy Conversion and Management. 2006, 47: 201-210. [4] M. A. Kedzietski. Effect of CuO Nanoparticle Concentration on R134A/Lubricant Pool Boiling Heat Transfer. Micro/Nanoscale Heat Transfer International Conference. 2008, January6-9:1-8. [5] S. -S. Bi, L. Shi and L. -L. Zhang. Application of Nanoparticles in Domestic Refrigerators. Applied Thermal Engineering. 2008, 28:1834-1843. [6] K. Lee, Y. Hwang, S. Cheong, L. Kwon, S. Kim And J. Lee. Performance Evaluation of Nano-Lubricants of Fullerene Nanoparticles in Refrigeration Mineral Oil. Current Applied Physics. 2009, 9: e128-e131. [7] H. Peng, G. Ding, W. Jiang, H. Hu and Y. Gao. Heat Transfer Characteristics of Refrigerant-Based Nanofluid Flow Boiling Inside a Horizontal Smooth Tube. International Journal of Refrigeration. 2009, 32: 1259-1270. [8] Y. Choi, C. Lee, Y. Hwang, M. Park, J. Lee, C. Choi, and M. Jung. Tribological Behavior of Copper Nanoparticles as Additives in Oil. Current Applied Physics.2009, 9: e124-e127. [9] J. Lee, S. Cho, Y. Hwang, H. –J. Cho, C. Lee, Y. Choi, B.-C. Ku, H. Lee, B. Lee, D. Kim, S. H. Kim. Application of Fullerene-Added Nano-Oil for Lubrication Enhancement in Friction Surfaces. Tribology International. 2009, 42: 440-447. [10] K. Henderson, Y. –G. Park, L. Liu and A. M. Jacobi. Flow-Boiling Heat Transfer of R134a-Based Nanofluids in Horizontal Tube. International Journal of Heat and Mass Transfer. 2010, 53: 944-951. 84PDF Image | Heat Transfer Analysis of Vapor Compression System Using Nano Cuo-R134a
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