Journal of Advanced Marine Engineering and Technology

  • 제33권4호
  • /
  • Pages.459-465
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  • 2009
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  • 2234-7925(pISSN)
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  • 2234-8352(eISSN)
한국마린엔지니어링학회 (The Korean Society of Marine Engineering)
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내부 열교환기를 이용한 R744용 초임계 냉동사이클의 성능 분석

Performance Analysis of R744 (Carbon Dioxide) Transcritical Refrigeration System Using Internal Heat Exchanger

  • 손창효 (부경대학교 기계공학부) ;
  • 오후규 (부경대학교 기계공학부 냉동공조공학과)
  • 발행 : 2009.05.31
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초록

This paper considers the influence of internal heat exchangers to the efficiency of a refrigerating system. These internal heat exchangers(liquid-suction or suction-line heat exchangers) can, in some cases, yield improved system performance while in other cases they degrade system performance. A steady state mathematical model is used to analysis the performance characteristics of refrigeration system with internal heat exchanger. The influence of operating conditions, such as gas cooler pressure and evaporation temperatures, superheat in the evaporator and temperature of gas cooler outlet, to optimal dimensions of the heat exchanger is also analyzed in the paper. The main results were summarized as follows : the mass flowrate of R744, inner diameter tube and length of internal heat exchanger, and effectiveness have an effect on the cooling capacity, compressor work and RCI(Relative capacity index) of this system. With a thorough grasp of these effect, it is necessary to design the R744 compression refrigeration cycle using internal heat exchanger.

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참고문헌

  1. S. S. Pitla, D. M. Robinson, E. A. Groll and S. Ramadhyani, "Heat transfer from supercritical carbon dioxide in tube flow: A critical review", HVAC＆R research, 4(4), pp. 281-301, 1998 https://doi.org/10.1080/10789669.1998.10391405
  2. V. Vesovic. W. A, Wakeham, G. A. Olchowy, J. V. Sergers, J. T. R. Watson and J. Millat, "The transport properties of carbon dioxide", J. Phy. Chem. Ref. Data, 19(3), pp. 763-810, 1990 https://doi.org/10.1063/1.555875
  3. S. H. Lee and J. R. Howell, "Turbulent developing convective heat transfer in a tube for fluids near the critical point", International Journal of Heat and Mass Transfer, 41(10), pp. 1205-1218, 1998 https://doi.org/10.1016/S0017-9310(97)00217-2
  4. Z. Yuan, M. Michael and D. Jafer, "Forced convection boiling heat transfer of $CO_2$ in horizontal tubes", Ⅹ th ASME/JSME Joint Thermal Engineering Conference, 1999
  5. G. Lorentzen and J. Pettersen, "A new, efficient and environmentally benign system for car air-conditioning", Int. J. of Refrigeration, 16(1), pp. 4-12, 1993 https://doi.org/10.1016/0140-7007(93)90014-Y
  6. W. F. Stoecker and D. J. Walukas, "Conserving energy in domestic refrigerators through the use of refrigerant mixture". ASHRAE Transactions, 87 (1), pp. 279-281, 1981
  7. M. O. McLinden, "Optimum refrigerants for non-ideal cycles: an analysis employing corresponding states". Proceedings ASHRAE-Purdue CFC and IIR-Purdue Refrigeration Conferences, W.Lafayette (IN), pp. 17-20, 1990
  8. P. A. Domanski and D. A. Didion, "Thermodynamic evaluation of R22 alternative refrigerants and refrigerant mixtures". ASHRAE Transactions, 99(2), pp. 636-648, 1993
  9. P. A. Domanski, D. A. Didion, J. P. Doyle, "Evaluation of suction-line/liquid-line heat exchange in the refrigeration cycle". Rev Int Froid, 7(7), pp. 487-93, 1994
  10. S. A. Klein and F. L. Alvarado, EES engineering Equation solver. 4406 Fox Bluff Rd, Middleton(WI 53562): F-Chart Software, 1998