Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
권호 표지

An Experimental Study on Frosting of Humid Air-flow on a Surface with Local Cooling for Heat Exchanger Design

열교환기 설계를 위한 국소 냉각 표면위에서의 습공기 유동의 착상실험

  • Published : 2008.02.29
Download PDF
⟨ Previous Next ⟩

Abstract

The present study has been conducted to understand the heat and mass transfer characteristics of humid airflow in frosting conditions. A flat plate of aluminum was used for the simulation of flat surface part of the fin of the heat exchanger. The aluminum surface temperatures were measured and analyzed to clarify the heat and mass transfer characteristics under frosting conditions. Also, the pressure drops were measured to clarify the air-blocking effect of frost in the mini channel of the air-side hoot exchangers. A data reduction method was developed far the analysis of local characteristics of humid air under frosting conditions.

본 연구는 착상이 일어나는 조건에서 작은 사각 덕트내의 습공기의 층류유동에서 열 및 물질전달특성을 이해하고자 수행되었다. 알루미늄 평판이 열교환기의 핀부분을 모사하기 위하여 사용되었다. 알루미늄 표면온도는 착상조건에서의 열 및 물질전달 특성을 조사하여 해석하기 위하여 측정되었다. 또한 열교환기 공기측 채널에서 착상에 의한 air-blocking효과를 화인하기 위해 압력강하가 측정되었다. 그리고 착상조건에서 습공기의 국소 특성을 해석하기 위한 방법이 제시되었다.

Keywords

References

  1. O'Neal, D.L.; Tree, D.R. A review of frost formation in simple geometries, ASHRAE Trans., 1985, 91, 267
  2. Sami, S.M.; Duong, T. Mass and heat transfer during froth growth, ASHRAE Trans., 1989, 95, 158
  3. Schneider, H.W. Equation of the growth rate of frost forming on cooled surface, Int. J. Heat Mass Transfer, 1978, 21, 1019 https://doi.org/10.1016/0017-9310(78)90098-4
  4. Dietenberger, M.A. Generalized correlation of the water frost thermal conductivity, Int. J. Heat Mass Transfer, 1983, 26, 607 https://doi.org/10.1016/0017-9310(83)90011-X
  5. Sahin, A.Z. Effective thermal conductivity of frosting during the crystal growth period, Int. J. Heat Mass Transfer, 2000, 43, 539 https://doi.org/10.1016/S0017-9310(99)00162-3
  6. Yun, R.; Kim, Y.; Min, M. Modeling of frost growth and frost properties with airflow over a flat plate, Int. J. Refrigeration, 2002, 25, 362 https://doi.org/10.1016/S0140-7007(01)00026-3
  7. Lee, Y.B.; Ro, S.R. An experimental study of frost formation on a horizontal cylinder under cross flow, Int. J. Refrigeration, 2001, 24, 468 https://doi.org/10.1016/S0140-7007(00)00073-6
  8. Na, B.; Webb, R.L. New model for frost growth rate, Int. J. Heat Mass Transfer, 2004, 47, 925 https://doi.org/10.1016/j.ijheatmasstransfer.2003.09.001
  9. Jones, B.W.; Parker, J.D. Frost formation with varying environmental parameters, J. Heat Transfer, 1975, 97, 255 https://doi.org/10.1115/1.3450350
  10. Sanders, C.T. The Influence of Frost Formation and Defrosting on the Performance of Air Coolers, Ph.D. thesis, Delft Technical University, 1974
  11. Senshu, T.; Yasuda, H.; Oguni, K.; Nishibane, K. Heat pump performance under frosting conditions: partI-heat and mass transfer on cross-finned tube heat exchangers under frosting conditions, ASHRAE Trans., 1990, 96, 324
  12. Yang, D.K.; Lee, K.S. Dimensionless correlations of frost properties on a cold plate, Int. J. Refrigeration, 2004, 27, 89 https://doi.org/10.1016/S0140-7007(03)00118-X