Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지
DOI QR코드

DOI QR Code

Heat Transfer Characteristics of the Non-Uniform Grooved Tube Considering Tube Expansion

확관을 고려한 불균일 내면가공관의 전열특성

  • Lee, Sang-Mu (Living Environment System Lab., Mitsubishi Electric Corp.) ;
  • Park, Byung-Duck (Department of Automotive Engineering, Kyungpook National University)
  • 이상무 (미쯔비시전기 주환경연구소) ;
  • 박병덕 (경북대학교 자동차공학부)
  • Received : 2012.02.20
  • Published : 2012.07.10
Download PDF
⟨ Previous Next ⟩

Abstract

A plate-fin heat exchanger is a type of heat exchanger widely used in air conditioners, and tubes and fins are tightly assembled by the mechanical expansion process of tubes. The tube expansion process deforms the grooves inside the tube, and the groove shapes also affect the adhesion between tubes and fins. In this study, the adhesion and heat transfer performance affected by the tube expansion of the non-uniform groove shape tube with different heights are investigated by both analysis and experiments. From the analysis method, it was shown that the contact pressure of non-uniform groove tube is higher than that of the uniform groove tube, and the most appropriate high groove number of the non-uniform groove tube is designed for the maximum contact pressure. From the experimental results, the decreasing rate of the condensation heat transfer coefficient is smaller in the non-uniform groove tube with different heights, compared to the conventional uniform groove tube. Also, the air-side heat transfer coefficient of the non-uniform groove tube with different heights is higher than that of the uniform groove tubes.

Keywords

References

  1. The recent movements of heat exchanger development, 2008, Magazine of the SAREK, Vol. 37, No. 2, pp. 4-41.
  2. Kim, C. N., Jeong, J., Youn, B., and Kil, S. H., 2003, An experimental-numerical evaluation of thermal contact conductance in fin-tube heat exchangers, JSME International Journal B, Vol. 46, No. 2, pp. 299-307. https://doi.org/10.1299/jsmeb.46.299
  3. Jeong, J., Kim, C. N., and Youn, B., 2006, A study on the thermal contact resistance in fin-tube heat exchanger with 7 mm tube, International Journal of Heat and Mass Transfer, Vol. 49, No. 7, pp. 1547-1555. https://doi.org/10.1016/j.ijheatmasstransfer.2005.10.042
  4. Park, Y., Jeong, Y., Lee, J., and Park, N., 2009, Heat transfer characteristic of finned-tube heat exchangers with different clearance between fin collar and tube surface, Proceedings of the SAREK Summer Annular Conference, pp. 1073-1078.
  5. Sasaki, N., Kakiyama, S. H., and Sanuki, N., 2004, Effect of enhanced heat transfer spirally grooved tube with ability to control the heat transfer disturbance by mechanical tube expanding, Trans. of the JSRAE, Vol. 21, No. 2, pp. 129-138.
  6. Tang, D., Peng, Y., and Li, D., 2009, Numerical and experimental study on expansion forming of inner grooved tube, Journal of Materials Processing Technology, Vol. 209, pp. 4668-4674. https://doi.org/10.1016/j.jmatprotec.2008.11.037
  7. Lee, S., Ishibashi, A., and Matsuda, T., 2011, Heat transfer characteristics of high performance inner grooved tube, Proceedings JSRAE Annual Conference, pp. 503-504.
  8. Suzuki, H., Hashizume, S. H., Yabuki, Y., Ichihara, Y., Nakajima, S., and Kenmochi, K., 1968, Report of the Institute of Industrial Science, The University of Tokyo, Vol. 18, No. 3.
  9. Petukhov, B. S. and Roizen, L. I., 1964, Generalized relationships for heat transfer in a turbulent flow of a gas in tubes of annular section, High temperature(USSR), Vol. 2, pp. 65-68.
  10. Gnielinski, V., 1976, New equations for heat and mass transfer in turbulent pipe channel flow, International Chemical Engineering, Vol. 16, No. 2, pp. 359-368.

Cited by

  1. A Development of Heat Exchanger by using Small Bore Two-Port Tube vol.27, pp.2, 2015, https://doi.org/10.6110/KJACR.2015.27.2.063
  2. The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion vol.8, pp.5, 2018, https://doi.org/10.3390/app8050756