Analytical and experimental examination of microwave defrosting method on commercial refrigerator evaporators
Kim, Jong Woo
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https://hdl.handle.net/2142/34300
Description
Title
Analytical and experimental examination of microwave defrosting method on commercial refrigerator evaporators
Author(s)
Kim, Jong Woo
Issue Date
2012-09-18T21:10:14Z
Director of Research (if dissertation) or Advisor (if thesis)
Brewster, M. Quinn
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Defrosting
Radiative Melting
Microwave Defrosting
Evaporator Defrosting
Evaporator Thawing
Abstract
Defrosting of domestic refrigerator evaporator coils is currently done with external electrical heaters of various designs using a combination of convection, radiation, and conduction. These designs put unnecessary heat into the refrigerators during the defrosting process and the heat must be taken out again by the compressor work. Radiation, which has a fundamentally different mechanism from conduction and convection, can have significant advantages over traditional defrosting methods since it doesn’t heat up the air inside evaporator.
Defrosting experiments are done to find out the effectiveness of microwave defrosting in a commercial microwave oven. Frost is formed on the small aluminum evaporator with a controlled temperature and mass and thaws out in the microwave oven while measuring the defrosting conditions. Temperature and geometry of defrosting conditions are discussed by changing the frost temperature and magnetron positions to the evaporator. Later, Monte Carlo simulations are performed to find out the uniformity of defrost in a two-dimensional slot. Various incoming angles and surface conditions are compared to find out the best condition. The fundamental mechanisms of microwave oven defrosting and experiment results are presented in detail.
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