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http://dx.doi.org/10.6110/KJACR.2012.24.11.792

Basic Study on the Definition of the Second Law Efficiencies of Thermodynamic Cycles  

Park, Kyoung Kuhn (School of Mechanical Engineering, Kookmin University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.24, no.11, 2012 , pp. 792-798 More about this Journal
Abstract
A general concept on the definition of the second law efficiencies of thermodynamic cycles is introduced. The efficiency is defined to be proportional to the entropy generation divided by the maximum possible entropy generation. This way of definition of the cycle efficiency is clear and concise and, moreover, follows faithfully the concept of the second law of thermodynamics. This definition is applied to heat engine, refrigerator and heat pump. The second law efficiencies of heat engine and refrigeration cycles are derived, which are the same as the existing ones, respectively. The second law efficiency of heat pump, however, finds to be different from the existing one. Discussion is given about the difference and its cause.
Keywords
Thermodynamic cycle; Second law efficiency; Refrigeration; Heat pump; Exergy;
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1 Cengel, Y. A. and Boles, M. A., 2011, Thermodynamics： An Engineering Approach, 7th ed., McGraw-Hill, New York, pp. 432-435.
2 Borgnakke, C. and Sonntag, R. E., 2009, Fundamentals of Thermodynamics, 7th ed., SI version, John Wiley and Sons, New York, pp. 351-357.
3 Moran, M. J. and Shapiro, H. N., 2008, Fundamentals of Engineering Thermo-dynamics, 6th ed., John Wiley and Sons, Hoboken, NJ, pp. 359-365.
4 DiPippo, R., 2004, Second law assessment of binary plants generating power from lowtemperature geothermal fluids, Geothermics, Vol. 33, pp. 565-586.   DOI
5 Dincer, I. and Rosen, M. A., 2007, Exergy： Energy, Environment and Sustainable Development, Elsevier, Amsterdam, pp. 11-15.
6 Lior, M. and Zhang, N., 2007, Energy, exergy, and second law performance criteria, Energy, Vol. 32, pp. 281-296.   DOI   ScienceOn
7 Marmolejo-Correa, D. and Gundersen, T., 2012, A comparison of exergy efficiency definitions with focus on low temperature processes, Energy, Vol. 44, pp. 477-489.   DOI
8 Sekulic, D. P., 1990, The second law quality of energy transformation in a heat exchanger, J. Heat Transfer(Trans. ASME), Vol. 112, pp. 295-300.   DOI
9 Yilmaz, M., Sara, O. N., and Karsli, S., 2001, Performance evaluation criteria for heat exchangers based on second law analysis, Exergy Int. J., Vol. 1, pp. 278-294.   DOI
10 Sciubba, E. and Wall, G., 2007, A brief commented history of exergy from the beginnings to 2004, Int. J. Thermodyn., Vol. 10, pp. 1-26.
11 Park, K. K., Basic study on the definition of the second law efficiencies of processes and components, manuscript in preparation.