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TECHNICAL PAPERS: Melting and Freezing

Frost Temperature Relations for Defrosting Sensing System

[+] Author and Article Information
J. Iragorry, Y.-X. Tao

Department of Mechanical and Materials Engineering, Florida International University, Miami, Florida 33174

J. Heat Transfer 127(3), 344-351 (Mar 24, 2005) (8 pages) doi:10.1115/1.1860566 History: Received April 27, 2004; Revised December 02, 2004; Online March 24, 2005
Copyright © 2005 by ASME
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References

Tao, Y. X., Mao, Y., and Besant, R. W., 1994, “Frost Growth Characteristics on Heat Exchanger Surfaces: Measurement and Simulation Studies,” Proceedings of the 1994 ASME International Mechanical Engineering Congress and Exposition, Chicago, IL, Nov. 1994, HTD-Vol 286 , pp. 29–38.
Chen,  H., Thomas,  L., and Besant,  R. W., 2000, “Modeling Frost Characteristics on Heat Exchanger Fins: Part I. Numerical Model,” ASHRAE Trans., 106(Pt. A), pp. 357–367.
Chen,  H., Thomas,  L., and Besant,  R. W., 2000, “Modeling Frost Characteristics on Heat Exchanger Fins: Part II. Model Validation and Limitations,” ASHRAE Trans., 106(Pt. A), pp. 368–376.
Martinez-Frias,  J., and Aceves,  S. M., 1999, “Effects of Evaporator Frosting on the Performance of a Air-To-Air Heat Pump,” J. Energy Resources Technology, 121, pp. 60–65.
Hao, Y. L., Iragorry, J., Castro, D., Tao, Y.-X., and Jia, S., 2002, “Microscopic Characterization of Frost Surface During Liquid-Ice Phase Change Period,” Proceedings of the 2002 ASME International Mechanical Engineering Congress & Exposition, New Orleans, LA, November 17–22, 2002, Paper No. IMECE2002-32797.
Kaviany, M., 1993, Principles of Heat Transfer in Porous Media, Springer Verlag, New York, p. 471.
Mao,  Y., Besant,  R. W., and Chen,  H., 1999, “Frost Characteristics and Heat Transfer on a Flat Plate Under Freezer Operating Conditions: Part I, Experimentation and Correlations,” ASHRAE Trans., 105(Pt. A), pp. 231–251.
Iragorry,  J., Tao,  Y.-X., and Jia,  S., 2004, “A Critical Review of Properties and Models for Frost Formation Analysis,” HVAC&R Res., 10(4), pp. 393–420.
Hayashi,  Y., Aoki,  A., Adachi,  A., and Hori,  K., 1977, “Study of Frost Properties Correlating With Frost Formation Types,” Trans. ASME, Series C: J. Heat Transfer, 99, pp. 239–245.
Tao,  Y.-X., Besant,  R. W., and Rezkallah,  K. S., 1993, “Mathematical Model for Predicting the Densification and Growth of Frost on a Flat Plate,” Int. J. Heat Mass Transfer, 36(2), pp. 353–363.
Chen,  H., Thomas,  L., and Besant,  R. W., 2002, “Fan Supplied Heat Exchanger Fin Performance Under Frosting Conditions,” Int. J. Refrig., 26, pp. 140–149.
Sanders, C. T., 1974, “The Influence of Frost Formation and Defrosting on the Performance of Air Coolers,” Ph.D. thesis, Delf Technical University.
Lee,  K. S., Lee,  T. H., and Kim,  W. S., 1994, “Heat and Mass Transfer of Parallel Plates Heat Exchanger Under Frosting Condition,” SAREK J.,6, pp. 155–165.

Figures

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Removable fins (aluminum 38×38×1.6 mm). Thermal conductive paste is used between fins and base.
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Schematics of experimental apparatus
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Infrared sensor calibration chart, low and high temperature range
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Mass concentration on fin surface as a function of frost-wall temperature difference for different heat removal rates, Re=1400
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Frost thickness as a function of frost-wall temperature difference for different heat removal rates, Re=1400
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Frost layer developed on fin surface: Ta=−7°C,Tw=−23°C,qw=31,500 W/m2
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Frost layer thickness history for different base temperatures and heat flux removal rates: Re=1400
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Base-frost temperature difference history for different base temperatures and heat flux removal rates, Re=1400
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Frost layer thickening history for different base temperatures and heat removal rates, Re=4500
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Base-frost temperature difference history for different base temperatures and heat flux removal rates, Re=4500
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Mass concentration on fin surface as a function of frost-wall temperature difference for different heat removal rates, Re=4500
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Frost thickness as a function of frost-wall temperature difference for different heat removal rates, Re=4500
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Defrosting process with an initial mass concentration (mi) of 0.030966 (g/cm2 ), and defrosting temperature of 40°C
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Required defrosting time as a function of initial mass concentration. Forced convection versus natural convection. Defrosting temperature of 40°C.
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Required defrosting energy as a function of initial mass concentration. Forced convection at low Reynolds number and defrosting temperature of 40°C.
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Required defrosting time as a function of initial mass concentration. Natural convection and defrosting temperature of 60°C.
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Required defrosting energy as a function of initial mass concentration. Natural convection and defrosting temperature of 60°C.
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Reduction of air-frost temperature difference at high Reynolds number. Heat flux in W/m2 .
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Average effective frost thermal conductivity

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