2026-09-23T01:22:58Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/88188 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Jacobi, Anthony M. Jacobi, Anthony M. Brewster, M. Quinn Hrnjak, Predrag S. Wang, Xinlei Bock, Jessica J. 2015-09-29T20:49:56Z 2015-09-29T20:49:56Z 2017-09-30T09:15:38Z 2015-08 2015-07-17 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. 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). No. of bitstreams: 2 BOCK-DISSERTATION-2015.pdf: 2044592 bytes, checksum: 2a60c529f417d3fa147c05cd1c7d3444 (MD5) LICENSE.txt: 4209 bytes, checksum: fa9f7009692e22b136add069f46ef6f2 (MD5) Previous issue date: 2015-07-17 Embargo set by: Seth Robbins for item 89468 Lift date: 2017-09-29T20:50:34Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 89468 on 2017-09-30T09:15:38Z. application/pdf http://hdl.handle.net/2142/88188 en Copyright 2015 Jessica Bock R-1234ZE vapor-liquid equilibria (VLE) Vapor-liquid equilibria of a low GWP refrigerant, R-1234ze(E), mixed with a POE lubricant text text 2015-8 Mechanical Sci & Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.