Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Comparison of Heat Transfer Performance and Pressure Drop of Fin-Tube and Aluminum Heat Exchangers

핀-튜브 열교환기와 알루미늄 열교환기의 전열성능과 압력강하 특성비교

  • Published : 2009.02.28
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Abstract

This study presents comparison of heat transfer and air side friction characteristics in a condenser condition of air conditioner between Louver fin-tube heat exchangers and aluminum parallel heat exchangers. All experiments are performed using an air-enthalpy type calorimeter, which is designed based on the method described in ASHRAE standards. The air velocities crossing the heat exchanger tubes are varied from 0.7 to 1.6 m/s with 0.3 m/s interval, maintaining air dry temperature and relative humidity at $20^{\circ}C$ and 60% respectively. Water temperature and flow rate inside the tube are $70^{\circ}C$ and 10 LPM, respectively. Experimental results show that the heat transfer performances of aluminum heat exchangers are 17-163% higher than those of Louver fin-tube heat exchangers based on the data per unit volume, mass, and heat transfer area, whereas air side pressure drops of aluminum heat exchangers are 19-81% lower.

본 논문에서는 루버형 핀 형상을 가진 핀-튜브 열교환기와 알루미늄 평행류 열교환기의 에어컨 응축기 조건에서의 열전달 성능과 공기측 압력강하 특성을 비교하였다. 모든 실험은 ASHRAE 표준에 근거해 제작된 공기엔탈피형 칼로리미터를 사용하여 수행하였다. 관외 측 공기 속도는 0.7-1.6 m/s까지 0.3 m/s 간격으로 변화시켰으며 건구온도는 $20^{\circ}C$, 상대습도는 60%로 유지하였다. 관내 측 물의 입구온도는 $70^{\circ}C$, 유량은 10 LPM로 고정하였다. 알루미늄 열교환기의 열전달 성능은 루버 핀-튜브 열교환기보다 단위체적당, 단위질량당, 단위열전달면적당 약 17-163%정도 높게 나타나는 연구결과를 보였으며 반면에 공기측 압력강하는 핀-튜브 열교환기에 비해 약 19-81% 정도 낮게 나타났다.

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References

  1. Yun, R., Heo, J. H., Kim, Y.. (2006), "Evaporative heat transfer and pressure drop of R410A in microchannels", International Journal of Refrigeration 29, pp. 92-100. https://doi.org/10.1016/j.ijrefrig.2005.08.005
  2. Choi, K. I., Pamitran, A. S., Oh, J. T., (2002), "Boiling heat transfer of R410A in horizontal small diameter tubes", Proceedings of 2002 winter annual conference, The Society of Air-Conditioning and Refrigerating Engineers of Korea, pp. 283-288.
  3. Coleman, J. W., Krause, P. E., (2004), "Two-phase pressure losses of R134A in microchannel robe headers with large free flow area ratios", Exp. Therm. Fluid Sci. 28, pp. 219-226.
  4. Park, K. J., Lee, K. Y., Jung, D. S., (2005), "Flow condensation heat transfer coefficients of R22, R410A and propane in aluminum multi-channel tube", Korean Journal of Air-conditioning and Refrigeration Engineering Vol. 17, No.7, pp. 649-658.
  5. Wang, C. C., Tao, W. H., Chang, C. J., (1999), "An investigation .of the air side performance of the slit fin-and-tube heat exchangers", Int. J. of Refrigeration, Vol. 22, pp. 595-603. https://doi.org/10.1016/S0140-7007(99)00031-6
  6. Du, Y. J., Wang, C. C., (2000), "An experimental study of the air-side performance of the super slit fin-and-tube heat exchangers", Int. J. of Heat and Mass Transfer, Vol. 43, pp. 4475-4482. https://doi.org/10.1016/S0017-9310(00)00082-X
  7. Wang, C. C., Lee, W. S., Sheu, W. J., (2001), "A comparative study of compact enhanced fin-and-tube heat exchangers", Int. J. of Heat and Mass Transfer, Vol. 44, pp. 3565-3573. https://doi.org/10.1016/S0017-9310(01)00011-4
  8. Dejong, N. C., Jacobi, A. M., (1997), "An experimental study of flow and heat transfer in parallel-plate arrays: local, row-by-row and surface average behavior", Int. J. Heat and Mass Transfer, Vol. 40, pp. 1365-1378. https://doi.org/10.1016/S0017-9310(96)00186-X
  9. Bae, T. S., Han, C. S., (1996), "A feasibility study on room air conditioner with parallel flow condenser", Air-Conditioning and Refrigeration Engineering, Proceedings of the SAREK 1996 Summer Annual Conference, pp. 402-407.
  10. Kim, M. H., Kim, K. J., Chu, E. S., Bae, Y. D., Park, Y. S., (1997), "Performance evaluation of brazed aluminum heat exchangers", Air-Conditioning and Refrigeration Engineering, Proceedings of the SAREK 1997 Summer Annual Conference, pp. 209-215.
  11. Cho, J. P., Choi, Y. H., Kim, J. H., Kim, N. H., Kim, J. H., (2000), "Performance evaluation of PF-condenser adapted to Large Size air-conditioner", KSME, pp. 1-6.
  12. ASHRAE Standard 33-78, (1978), "Methods of testing forced circulation air cooling and air heating coils", pp. 33-78.
  13. Korean Standard Association, 2003, KS Air-Conditioner: KS C 9306.