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line and superheating are investigated. Based on the analysis done, the following conclusions can be made: 1. R123 gives a higher thermal efficiency compared to isobutane, R123 efficiency ranges from 22 to 26% while isobutane ranges from 17 to 19%. 2. R123 is more suitable for higher temperature applications, while isobutane is preferable for lower temperature applications. 3. The ORC efficiency is closer to the Carnot efficiency with the difference being less than 10%. 4. The ORC efficiency for R123 is a weak function of turbine inlet temperature; as a result, superheating is undesirable. 5. Superheating isobutane for the ORC can increase the efficiency but there is an optimal temperature, from 150°C to 170°C. REFERENCES 1. Petroleum Marketing Monthly, September 2005. 2. Eighth Malaysia Plan. Government of Malaysia. K.L. 2000 3. U.S. Dept of Energy. www.eere.energy.gov. U.S.A. 2004 4. Duffie, J.A. and Beckman, W.A., (1991), Solar Engineering of Thermal Processes. 2nd Ed. U.S.A.: John Wiley and Sons, Ltd. 5. Patel, M.K., (1999), Wind and Solar Power Systems, U.S.A: CRC Press Ltd. 6. Metrological Department of Malaysia, Selangor, (2004), Unpublished 7. Hung, T.C., Shai, T.Y. and Wang, S.K., (1997), Energy: A Review of Organic Rankine Cycles (ORCs) for the Recovery of Low-Grade Waste Heat, 22(7):661-667. 8. Nag, P.K., (2002), Power Plant Engineering. 2nd Ed. Singapore: Mc-Graw Hill. 9. Yamamoto, T., Furuhata, T., Arai, N. and Mori, K., (2001), Energy: Design and Testing of the Organic Rankine Cycle, 26:239-251. 10. Larjola, J., (1995), Int. J., Production Economics: Electricity from Industrial Waste Heat Using High-Speed Organic Rankine Cycle (ORC), 41: 227-235. 11. Younglove, B.A. and McLinden, M.O., (1994), J. Phys. Chem. Ref. Data: An International Standard Equation of State for the Thermodynamic Properties of Refrigerant 123 (2,2-Dichloro-1,1,1-Trifluoroethane), 23(5):731-765. 12. Younglove, B.A. and Ely, J.F., (1987), J. Phys. Chem. Ref. Data: Thermodynamical Properties of Fluids. II. Methane, Ethane, Propane, Isobutane, and Normal Butane, 16(4):577-797. 13. National Institute of Standard and Testing. http://www.nist.gov. America. 2004. 14. Liu, B.T., Chien, K.H. and Wang, C.C., (2004), Energy: Effect of Working Fluids on Organic Rankine Cycle for Waste Heat Recovery, 29:1207- 1217. 77 Jurnal Mekanikal, December 2005PDF Image | SOLAR THERMAL ORGANIC RANKINE CYCLE AS A RENEWABLE ENERGY
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