Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
권호 표지
DOI QR코드

DOI QR Code

EFFECTS OF CHANNEL ASPECT RATIO ON FLOW AND HEAT TRANSFER CHARACTERISTICS OF PRIMARY SURFACE HEAT EXCHANGER FOR ORC

유기랭킨사이클(ORC)을 위한 주전열면 열교환기의 채널 종횡비에 따른 유동 및 열전달 특성

  • Sung, M.J. (Dept. of Mechanical Engineering, Graduate School, Kookmin Univ.) ;
  • Ahn, J. (School of Mechanical Systems Engineering, Kookmin Univ.)
  • 성민제 (국민대학교 대학원 기계공학과) ;
  • 안준 (국민대학교 기계시스템공학부)
  • Received : 2013.09.02
  • Accepted : 2013.11.26
  • Published : 2013.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

A series of numerical simulation has been carried out to study thermo-hydraulic characteristics of a primary surface type heat exchanger, which is designed for the evaporator and condenser of a geothermal ORC. Working fluid is geothermal water at hot side and R-245fa, which is a refrigerant designed for ORC, at cold side. Aspect ratio of the channel and Reynolds number are considered as design parameters. Nusselt number is presented for the Reynolds number ranging from 50 to 150 and compared to existing correlations. The result shows that higher aspect ratio channel gives better heat transfer performance within the range of investigation.

Keywords

References

  1. 2011, Baik, Y.-J., Kim, M., Chang, K.-C, Lee, Y.-S. and Ra, H.S., "Power Optimazation of Organic Rankine-cycle System with Low-Temperature Heat Source Using HFC-134a," Trans. KSME B, Vol.35-1, pp.53-60.
  2. 2009, Baik, Y.-J., Kim, M., Chang, K.-C, Yoon, H.K., Lee, Y.-S. and Ra, H.S., "Analysis of HFC-245fa Organic Rankine Cycle for Geothermal Power Generation," Trans. KSGEE, Vol.5-1, pp.1-6.
  3. 2007, Kim, J.-S. and Lee, C.-K., "A Study of the Influence of Condensing Water Temperature on Low Temperature Geothermal Power Generation," Trans. KSGEE, Vol.3-2, pp.17-23.
  4. 2011, Park, C.Y., Hong, W.-K. and Kim, J.-M., "Thermodynamic Efficiencies of Organic Rankine Cycles with a Feed Liquid Heater or Regenerator," Trans. SAREK, Vol.23-10, pp.662-669. https://doi.org/10.6110/KJACR.2011.23.10.662
  5. 2012, Eom, H.S., Yoon, C.S., Kim, Y.M., Shin, D.G. and Kim, C.G., "Optimization Study on the Performance Analysis of Organic Rankine Cycle for Characteristics of Low Temperature Heat Sources," Trans. SAREK, Vol.24-1, pp.51-60. https://doi.org/10.6110/KJACR.2012.24.1.051
  6. 2008, Jeong, J.H., Kim, L.S., Ha, M.Y., Kim, K.S. and Cho, J.R., "Various Heat Exchangers Utilized in Gas-Turbine for Performance Enhancement," Int. J. Air-Cond. Ref., Vol.16-1, pp.30-36.
  7. 2000, McDonald, C.F., "Low-cost Compact Primary Surface Recuperator Concept for Microturbines," Applied Thermal Eng., Vol.20, pp.471-497. https://doi.org/10.1016/S1359-4311(99)00033-2
  8. 2002, Utriainen, E. and Sunden, B., "A Numerical Investigation of Primary Surface Rounded Cross Wavy Ducts," Heat Mass Transf., Vol.38, pp.537-542. https://doi.org/10.1007/s002310100243
  9. 2004, Jang, I.H., Hwang, S.D. and Cho, H.H., "Effects of Corrugation Angle on Local Heat/Mass Transfer in Wavy Duct of Heat Exchanger," Trans. KSME B, Vol.28-7, pp.789-799. https://doi.org/10.3795/KSME-B.2004.28.7.789
  10. 2005, Jang, I.H., Hwang, S.D. and Cho, H.H., "Effects of Aspect Ratio on Local Heat/Mass Transfer in Wavy Duct," Trans. SAREK, Vol.17-6, pp.569-580.
  11. 2005, Kays, W., Crawford, M. and Weigand, B., Convective Heat and Mass Transfer 4th Ed., McGraw-Hill, pp.67-129.