{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/34300"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/34300","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Analytical and experimental examination of microwave defrosting method on commercial refrigerator evaporators","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Kim, Jong Woo"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Brewster, M. Quinn"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-09-18T21:10:14Z","date_published":"2012-09-18T21:10:14Z","updated_at":"2026-07-22T22:25:31Z","subjects":["Defrosting","Radiative Melting","Microwave Defrosting","Evaporator Defrosting","Evaporator Thawing"],"languages":["en"],"rights":["Copyright 2012 Jong Woo Kim"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/34300","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Brewster, M. 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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.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-07-02T15:17:58Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Kim_Jong Woo.pdf: 4282445 bytes, checksum: 83d536ab189dc01dc091c9ce1b4c25d0 (MD5)","Made available in DSpace on 2012-09-18T21:10:14Z (GMT). No. of bitstreams: 2 Kim_Jong Woo.pdf: 4281301 bytes, checksum: 0f6763a9c2fa22bfe93825d7f0633b12 (MD5) license.txt: 4057 bytes, checksum: df09a16fc15522dd2c0251019e49257f (MD5)"]},{"key":"dc:title","label":"Title","values":["Analytical and experimental examination of microwave defrosting method on commercial refrigerator evaporators"]}]}],"canonical_facts":{"dc:contributor":["Brewster, M. Quinn"],"dc:creator":["Kim, Jong Woo"],"dc:date":["2012-09-18T21:10:14Z","2012-08"],"dc:description":["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.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-07-02T15:17:58Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Kim_Jong Woo.pdf: 4282445 bytes, checksum: 83d536ab189dc01dc091c9ce1b4c25d0 (MD5)","Made available in DSpace on 2012-09-18T21:10:14Z (GMT). No. of bitstreams: 2 Kim_Jong Woo.pdf: 4281301 bytes, checksum: 0f6763a9c2fa22bfe93825d7f0633b12 (MD5) license.txt: 4057 bytes, checksum: df09a16fc15522dd2c0251019e49257f (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/34300"],"dc:language":["en"],"dc:rights":["Copyright 2012 Jong Woo Kim"],"dc:subject":["Defrosting","Radiative Melting","Microwave Defrosting","Evaporator Defrosting","Evaporator Thawing"],"dc:title":["Analytical and experimental examination of microwave defrosting method on commercial refrigerator evaporators"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:31Z"}