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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

Figures

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Infrared sensor calibration chart, low and high temperature range
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Schematics of experimental apparatus
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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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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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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 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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