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TECHNICAL PAPERS: Heat and Mass Transfer

Modeling the Cooling Process Path of a Dehumidifying Coil Under Frosting Conditions

[+] Author and Article Information
P. J. Mago

Department of Mechanical Engineering, Universidad de Oriente, Puerto La Cruz, Venezuela

Dr. S. A. Sherif

Department of Mechanical and Aerospace Engineering, University of Florida, 228 MEB, P.O. Box 116300, Gainesville, FL 32611-6300

J. Heat Transfer 124(6), 1182-1191 (Dec 03, 2002) (10 pages) doi:10.1115/1.1494451 History: Received July 31, 2001; Revised March 20, 2002; Online December 03, 2002
Copyright © 2002 by ASME
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References

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Sherif,  S. A., Mago,  P. J., Al-Mutawa,  N. K., Theen,  R. S., and Bilen,  K., 2001, “Psychrometrics in the Supersaturated Frost Zone.” ASHRAE Trans., 107(2), pp. 753–767.
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Notestine, H. E., 1966, “The Design, Fabrication, and Testing of an Apparatus to Study the Formation of Frost from Humid Air to an Extended Surface in Forced Convection,” M.S. thesis, The Ohio State University, Columbus, OH.
Gates,  R. R., Sepsy,  C. F., and Huffman,  G. D., 1967, “Heat Transfer and Pressure Loss in Extended Surface Heat Exchangers Operating Under Frosting Conditions—Part I: Literature Survey, Test Apparatus and Preliminary Results,” ASHRAE Trans., 73(2), pp. I.2.1–I.2.13.
Huffman, G. D., 1966, “Heat Transfer and Pressure Loss in an Extended Surface Heat Exchanger Operating Under Frosting Conditions,” M.S. thesis, The Ohio State University, Columbus, OH.
Huffman,  G. D., and Sepsy,  C. F., 1967, “Heat Transfer and Pressure Loss in Extended Surface Heat Exchangers Operating Under Frosting Conditions—Part II: Data Analysis and Correlations,” ASHRAE Trans., 73(2), pp. I.3.1–I.3.16.
Gatchilov, T. S., and Ivanova, V. S., 1979, “Characteristics of the Frost Formed on the Surface of Finned Air Coolers,” 15th International Congress of Refrigeration, Paper B2-71, Venice, France, pp. 997–1003.
Kondepudi, S. N., 1988, “The Effects of Frost Growth on Finned Tube Heat Exchangers Under Laminar Flow,” Ph.D. dissertation, Texas A&M University, College Station, TX.
Kondepudi,  S. N., and O’Neal,  D. L., 1987, “The Effects of Frost Growth on Extended Surface Heat Exchanger Performance: A Review,” ASHRAE Trans., 93(2), pp. 258–274.
Kondepudi,  S. N., and O’Neal,  D. L., 1988, “Performance of Triangular Spine Fins Under Frosting Conditions,” Heat Recovery Syst. CHP, 8(1), pp. 1–7.
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Kondepudi, S. N., and O’Neal, D. L., 1989, “The Effects of Frost Formation on the Thermal Performance of Finned Tube Heat Exchangers,” AIAA 24th Thermophysics Conference, AIAA Paper No. 89–1741, Buffalo, New York.
Kondepudi, S. N., and O’Neal, D. L., 1989, “The Performance of Finned Tube Heat Exchangers Under Frosting Conditions,” Collected Papers in Heat Transfer-1989, HTD-Vol. 123, ASME, New York, pp. 193–200.
Kondepudi,  S. N., and O’Neal,  D. L., 1990, “The Effects of Different Fin Configurations on the Performance of Finned-Tube Heat Exchangers Under Frosting Conditions,” ASHRAE Trans., 96(2), pp. 439–444.
Kondepudi,  S. N., and O’Neal,  D. L., 1991, “Frosting Performance of Tube Heat Exchangers with Wavy and Corrugated Fins,” Exp. Therm. Fluid Sci., 4(5), pp. 613–618.
Kondepudi, S. N., and O’Neal, D. L., 1991, “Modeling Tube-Fin Heat Exchangers Under Frosting Conditions,” 18th International Congress of Refrigeration, Paper No. 242, Montreal, Quebec, Canada.
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Rite,  R. W., and Crawford,  R. R., 1991, “A Parametric Study of the Factors Governing the Rate of Frost Accumulation on Domestic Refrigerator-Freezer Finned-Tube Evaporator,” ASHRAE Trans., 97(2), pp. 438–446.
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Al-Mutawa,  N. K., Sherif,  S. A., Mathur,  G. D., West,  J., Tiedeman,  J. S., and Urlaub,  J., 1998, “Determination of Coil Defrosting Loads: Part I—Experimental Facility Description (RP-622),” ASHRAE Trans., 104(1A), pp. 268–288.
Al-Mutawa,  N. K., Sherif,  S. A., Mathur,  G. D., Steadham,  J. M., West,  J., Harker,  R. A., and Tiedeman,  J. S., 1998, “Determination of Coil Defrosting Loads: Part II—Instrumentation and Data Acquisition Systems (RP-622),” ASHRAE Trans., 104(1A), pp. 289–302.
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Figures

Grahic Jump Location
Schematic of the freezer showing the test and auxiliary coils, the artificial load generator, and the location of thermocouples for temperature measurements
Grahic Jump Location
Schematic of the Test Fan-Coil Unit (FCU-T)
Grahic Jump Location
Schematic of the artificial sensible and latent load generator
Grahic Jump Location
Approximation method for treating a rectangular-plate fin of uniform thickness in terms of a flat circular-plate fin of equal area
Grahic Jump Location
Efficiency for a circular-plate fin of uniform thickness (Kuehn et al. 41)
Grahic Jump Location
Representation of the calculated and the straight-line dehumidifying paths through the dehumidifying coil (points on the chart are arbitrarily chosen for purposes of calculating the path)
Grahic Jump Location
Representation of the calculated cooling air path through the dehumidifying coil showing the calculated leaving air conditions from each row as well as the measured coil inlet and outlet states
Grahic Jump Location
Representation of processes on the psychrometric chart showing where the transition to a supersaturated state occurs by keeping the same entering air temperature (−8.3 °C) and gradually increasing the entering air relative humidity

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