{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/89075"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/89075","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effect of oil in circulation on automotive A/C component and system performance","abstract":"In Automotive air-conditioning system, oil is mixed with refrigerant and runs in the system. Although some amount of oil is beneficial to compressor to reduce compressor wear and prevent leakage, the existence of oil in circulation influences the performance of the air-conditioning system and components. In this study, the effect of oil in circulation on automotive A/C system is investigated, and the effect on evaporator and condenser distribution is also discussed. First, experiments are conducted on a real automotive A/C system with R134a and PAG46 as the combination of refrigerant and oil in both I35a condition and M35a condition. Six different amount of oil in circulation ratio (OCR) are investigated in each of the two conditions. The experiment results are analyzed for system capacity, heat transfer, pressure drop over heat exchangers and suction lines, compressor work, as well as COP. In addition, infrared images of both evaporator and condenser are taken in each experiment. The results are then compared with two previous findings to have a more generalized conclusion on the OCR effect on heat exchanger’s distribution. Furthermore, an EES model of evaporator and condenser is developed to validate the OCR effect on heat transfer and pressure drop over heat exchangers. Comparison between model and experiment results is made to validate each other.","abstract_html":"In Automotive air-conditioning system, oil is mixed with refrigerant and runs in the system. Although some amount of oil is beneficial to compressor to reduce compressor wear and prevent leakage, the existence of oil in circulation influences the performance of the air-conditioning system and components. In this study, the effect of oil in circulation on automotive A/C system is investigated, and the effect on evaporator and condenser distribution is also discussed. First, experiments are conducted on a real automotive A/C system with R134a and PAG46 as the combination of refrigerant and oil in both I35a condition and M35a condition. Six different amount of oil in circulation ratio (OCR) are investigated in each of the two conditions. The experiment results are analyzed for system capacity, heat transfer, pressure drop over heat exchangers and suction lines, compressor work, as well as COP. In addition, infrared images of both evaporator and condenser are taken in each experiment. The results are then compared with two previous findings to have a more generalized conclusion on the OCR effect on heat exchanger’s distribution. Furthermore, an EES model of evaporator and condenser is developed to validate the OCR effect on heat transfer and pressure drop over heat exchangers. Comparison between model and experiment results is made to validate each other.","abstract_has_math":false,"creators":["Liu, Xuan"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Hrnjak, Predrag S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-03-02T19:44:56Z","date_published":"2016-03-02T19:44:56Z","updated_at":"2026-07-22T22:26:32Z","subjects":["Lubricant","Automotive air-conditioning system"],"languages":["en"],"rights":["Copyright 2015 Xuan Liu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/89075","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hrnjak, Predrag S."]},{"key":"dc:creator","label":"Author","values":["Liu, Xuan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016-03-02T19:44:56Z","2015-12-11","2015-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Lubricant","Automotive air-conditioning system"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Xuan Liu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/89075"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In Automotive air-conditioning system, oil is mixed with refrigerant and runs in the system. Although some amount of oil is beneficial to compressor to reduce compressor wear and prevent leakage, the existence of oil in circulation influences the performance of the air-conditioning system and components. In this study, the effect of oil in circulation on automotive A/C system is investigated, and the effect on evaporator and condenser distribution is also discussed. First, experiments are conducted on a real automotive A/C system with R134a and PAG46 as the combination of refrigerant and oil in both I35a condition and M35a condition. Six different amount of oil in circulation ratio (OCR) are investigated in each of the two conditions. The experiment results are analyzed for system capacity, heat transfer, pressure drop over heat exchangers and suction lines, compressor work, as well as COP. In addition, infrared images of both evaporator and condenser are taken in each experiment. The results are then compared with two previous findings to have a more generalized conclusion on the OCR effect on heat exchanger’s distribution. Furthermore, an EES model of evaporator and condenser is developed to validate the OCR effect on heat transfer and pressure drop over heat exchangers. Comparison between model and experiment results is made to validate each other.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Xuan Liu, accepted the attached license on 2015-12-09 at 10:11.","The student, Xuan Liu, submitted this Thesis for approval on 2015-12-09 at 10:13.","This Thesis was approved for publication on 2015-12-11 at 10:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8974 on 2016-03-02 at 12:52:31","Made available in DSpace on 2016-03-02T19:44:56Z (GMT). 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In this study, the effect of oil in circulation on automotive A/C system is investigated, and the effect on evaporator and condenser distribution is also discussed. First, experiments are conducted on a real automotive A/C system with R134a and PAG46 as the combination of refrigerant and oil in both I35a condition and M35a condition. Six different amount of oil in circulation ratio (OCR) are investigated in each of the two conditions. The experiment results are analyzed for system capacity, heat transfer, pressure drop over heat exchangers and suction lines, compressor work, as well as COP. In addition, infrared images of both evaporator and condenser are taken in each experiment. The results are then compared with two previous findings to have a more generalized conclusion on the OCR effect on heat exchanger’s distribution. Furthermore, an EES model of evaporator and condenser is developed to validate the OCR effect on heat transfer and pressure drop over heat exchangers. Comparison between model and experiment results is made to validate each other.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Xuan Liu, accepted the attached license on 2015-12-09 at 10:11.","The student, Xuan Liu, submitted this Thesis for approval on 2015-12-09 at 10:13.","This Thesis was approved for publication on 2015-12-11 at 10:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8974 on 2016-03-02 at 12:52:31","Made available in DSpace on 2016-03-02T19:44:56Z (GMT). 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