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Title:Analytical and experimental examination of microwave defrosting method on commercial refrigerator evaporators
Author(s):Kim, Jong Woo
Advisor(s):Brewster, M. Quinn
Department / Program:Mechanical Sci & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(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.
Issue Date:2012-09-18
URI:http://hdl.handle.net/2142/34300
Rights Information:Copyright 2012 Jong Woo Kim
Date Available in IDEALS:2012-09-18
Date Deposited:2012-08


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