Journal of Mechanical Science and Technology

  • 제17권1호
  • /
  • Pages.122-128
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  • 2003
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Second Law Optimization of Water-to-Water Heat Pump System

  • Kim, Kyu-Hyung (Graduate School, Department of Mechanical Engineering, Chungbuk National University) ;
  • Woo, Joung-Son (Korea Institute of Energy Research) ;
  • Lee, Se-Kyoun (Faculty of Mechanical Engineering, Chungbuk National University)
  • 발행 : 2003.01.01
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초록

This paper presents a thermodynamic analysis of heat pump system using water as a heat source and heat sink. The primary object in this study is the optimization of exergetic efficiency. Two different systems, 2-stream and 1-stream system, are analyzed in detail. Mass flow ratio (the ratio of mass flow rate of water through evaporator to that through condenser) is identified as the most important parameter to be optimized. It is shown that there exists an optimum mass flow ratio to maximize exergetic efficiency. The variation of optimum exergetic efficiency of 2-stream system is quite small and the value lies between 0.2∼0.23 for the range of investigation in this study. However, far better performance can be obtained from 1-stream system. This means considerable irreversibilities are generated through condenser of the 2-stream system. The effects of adiabatic efficiency of compressor-motor unit on the overall system performance are also examined in the analysis.

키워드

참고문헌

  1. AI-Ragom, F. A. A., Daly, M., Kowaiski, G. J. and Zenouzi, M., 1997, 'Using an Exergy Analysis to Design a Heat Exchanger for Low Temperature Waste Heat Recovery,' Proceedings of the ASME Advanced Energy Systems Division, Aes-Vol, 37, pp. 211-218
  2. Akau, R. L. and Schoenhals, R. J., 1980, 'The Second Law Efficiency of a Heat Pump System,' Energy, Vol. 5, pp. 853-863 https://doi.org/10.1016/0360-5442(80)90101-2
  3. Gyftopoulos, E. P. and Widmer, T. F., 1980, 'Benefit-Cost of Energy Conservation,' Thermodynamics : Second Law Analysis, ACS Symposium Series 122, pp. 131-142 https://doi.org/10.1021/bk-1980-0122.ch008
  4. Liang, H. and Kuehn, T., 1991, 'Irreversibility Analysis of a Water-to-Water Mechanical-Com-pression Heat Pump,' Energy, Vol. 16, No. 6, pp. 883-896 https://doi.org/10.1016/0360-5442(91)90039-O
  5. Moran, M. J., 1989, Availibility Analysis Corrected ed., ASE Press, New York
  6. Moran, M. J. and Shapiro, H. N., 2000, Fundamentals of Engineering Thermodynamics, 4th ed., John Wiley & Sons, Inc., New York
  7. Nikolaidis, C. and Probert, D. 1998, 'Exergy-Method Analysis of a Two-Stage Vapour-Compression Refrigeration-Plants Performance,' Applied Energy, Vol. 60, pp. 241-256 https://doi.org/10.1016/S0306-2619(98)00030-0
  8. Reistad, G. M. and Gaggioli, R. A., 1980, 'Available Energy Costing,' Thermodynamics:Second Law Analysis, ACS Symposium Series 122, pp. 143-159 https://doi.org/10.1021/bk-1980-0122.ch009
  9. Smith, M. A. and Few, P. C., 2001, 'Second Law Analysis of an Experimental Domestic Scale Co-generation Plant Incorporating a Heat Pump,' Applied Thermal Engineering, Vol. 21, pp. 93-110 https://doi.org/10.1016/S1359-4311(00)00051-X