{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/88188"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/88188","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Vapor-liquid equilibria of a low GWP refrigerant, R-1234ze(E), mixed with a POE lubricant","abstract":"Novel vapor-liquid-equilibria data (P-T-x) and liquid densities of binary mixtures of an emerging low-GWP (Global Warming Potential) refrigerant, R-1234ze(E), and a polyol ester (POE) oil, RL68H, are measured. Data are presented for oil mass fractions ranging from 0 to 0.85 over a temperature range from -10 to 60°C, and the results are compared to the properties of mixtures of R-134a with RL68H. In addition to providing new pure-refrigerant and refrigerant/oil property data, a comparison of the performance of five mixture models is undertaken, namely: the Wilson model, NRTL, UNIQUAC, Heil, and Raoult’s law. Overall, the Heil model provides the best agreement in pressure predictions for R-1234ze(E)/RL68H mixtures, with RMS deviations less than 0.5%, while NRTL RMS deviations are less than 1%. However, comparable performance was found for the much simpler Raoult’s law, with increased deviations at the highest oil concentration. Model sensitivity and applicability of Raoult’s law for refrigerant/oil mixtures in general are investigated. The experimental data and modeling results presented are especially valuable for engineers working in the automotive air-conditioning and refrigeration industries. The refrigerant R-1234ze(E) is one of the leading alternatives for replacing R-134a and is a member of the HFO family of chemicals that includes other low-GWP refrigerants. Accurate models for the new refrigerants and refrigerant/oil mixtures are essential for designing and analyzing refrigeration and air-conditioning systems with reduced environmental impact.","abstract_html":"Novel vapor-liquid-equilibria data (P-T-x) and liquid densities of binary mixtures of an emerging low-GWP (Global Warming Potential) refrigerant, R-1234ze(E), and a polyol ester (POE) oil, RL68H, are measured. Data are presented for oil mass fractions ranging from 0 to 0.85 over a temperature range from -10 to 60°C, and the results are compared to the properties of mixtures of R-134a with RL68H. In addition to providing new pure-refrigerant and refrigerant/oil property data, a comparison of the performance of five mixture models is undertaken, namely: the Wilson model, NRTL, UNIQUAC, Heil, and Raoult’s law. Overall, the Heil model provides the best agreement in pressure predictions for R-1234ze(E)/RL68H mixtures, with RMS deviations less than 0.5%, while NRTL RMS deviations are less than 1%. However, comparable performance was found for the much simpler Raoult’s law, with increased deviations at the highest oil concentration. Model sensitivity and applicability of Raoult’s law for refrigerant/oil mixtures in general are investigated. The experimental data and modeling results presented are especially valuable for engineers working in the automotive air-conditioning and refrigeration industries. The refrigerant R-1234ze(E) is one of the leading alternatives for replacing R-134a and is a member of the HFO family of chemicals that includes other low-GWP refrigerants. Accurate models for the new refrigerants and refrigerant/oil mixtures are essential for designing and analyzing refrigeration and air-conditioning systems with reduced environmental impact.","abstract_has_math":false,"creators":["Bock, Jessica J."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Jacobi, Anthony M.","Brewster, M. Quinn","Hrnjak, Predrag S.","Wang, Xinlei"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-29T20:49:56Z","date_published":"2015-09-29T20:49:56Z","updated_at":"2026-07-22T22:26:31Z","subjects":["R-1234ZE","vapor-liquid equilibria (VLE)"],"languages":["en"],"rights":["Copyright 2015 Jessica Bock"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/88188","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Jacobi, Anthony M.","Brewster, M. 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Data are presented for oil mass fractions ranging from 0 to 0.85 over a temperature range from -10 to 60°C, and the results are compared to the properties of mixtures of R-134a with RL68H. In addition to providing new pure-refrigerant and refrigerant/oil property data, a comparison of the performance of five mixture models is undertaken, namely: the Wilson model, NRTL, UNIQUAC, Heil, and Raoult’s law. Overall, the Heil model provides the best agreement in pressure predictions for R-1234ze(E)/RL68H mixtures, with RMS deviations less than 0.5%, while NRTL RMS deviations are less than 1%. However, comparable performance was found for the much simpler Raoult’s law, with increased deviations at the highest oil concentration. Model sensitivity and applicability of Raoult’s law for refrigerant/oil mixtures in general are investigated. The experimental data and modeling results presented are especially valuable for engineers working in the automotive air-conditioning and refrigeration industries. The refrigerant R-1234ze(E) is one of the leading alternatives for replacing R-134a and is a member of the HFO family of chemicals that includes other low-GWP refrigerants. Accurate models for the new refrigerants and refrigerant/oil mixtures are essential for designing and analyzing refrigeration and air-conditioning systems with reduced environmental impact.","Submission published under a 24 month embargo labeled 'U of I only', the embargo will last until 2017-08-01","The student, Jessica Bock, accepted the attached license on 2015-07-13 at 15:06.","The student, Jessica Bock, submitted this Dissertation for approval on 2015-07-13 at 15:15.","This Dissertation was approved for publication on 2015-07-17 at 07:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8434 on 2015-09-29 at 14:59:29","Made available in DSpace on 2015-09-29T20:49:56Z (GMT). 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However, comparable performance was found for the much simpler Raoult’s law, with increased deviations at the highest oil concentration. Model sensitivity and applicability of Raoult’s law for refrigerant/oil mixtures in general are investigated. The experimental data and modeling results presented are especially valuable for engineers working in the automotive air-conditioning and refrigeration industries. The refrigerant R-1234ze(E) is one of the leading alternatives for replacing R-134a and is a member of the HFO family of chemicals that includes other low-GWP refrigerants. Accurate models for the new refrigerants and refrigerant/oil mixtures are essential for designing and analyzing refrigeration and air-conditioning systems with reduced environmental impact.","Submission published under a 24 month embargo labeled 'U of I only', the embargo will last until 2017-08-01","The student, Jessica Bock, accepted the attached license on 2015-07-13 at 15:06.","The student, Jessica Bock, submitted this Dissertation for approval on 2015-07-13 at 15:15.","This Dissertation was approved for publication on 2015-07-17 at 07:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8434 on 2015-09-29 at 14:59:29","Made available in DSpace on 2015-09-29T20:49:56Z (GMT). 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