2026-09-21T01:00:46Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/34318 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Hrnjak, Predrag S. Padilla, Yadira 2012-09-18T21:11:07Z 2012-09-18T21:11:07Z 2012-08 2012-09-18T21:11:07Z 2012-08 This thesis presents experimentally validated simulation models developed to obtain accurate prediction of microchannel heat exchanger performance and charge. Effects of using various correlations are presented and discussed with focus on microchannel condensers and evaporators. Experiments with different refrigerants including R290, R717, R1234yf, and R134a are used to validate the models. The experimentally validated models are used to compare the charge of various refrigerants. The procedure for charge reduction analysis described in the thesis is the reduction of the internal (refrigerant) volume of the condenser or evaporator until a pressure drop is obtained that results in a specified percent decrease in COP from the same refrigeration cycle with no pressure drop. Furthermore, the effect of mass flux on charge is studied and discussed. Lastly, prediction of charge in headers is explored and correlations for predicting charge in headers of microchannel condensers are presented. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-07-20T18:27:31Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Padilla_Fuentes_Yadira.pdf: 14942004 bytes, checksum: 1ff318178323674a61014fb92ab67a7d (MD5) Padilla_Fuentes_Yadira.docx: 11694987 bytes, checksum: 519e221845e502652d45e325cca411ec (MD5) Made available in DSpace on 2012-09-18T21:11:07Z (GMT). No. of bitstreams: 3 Padilla_Fuentes_Yadira.pdf: 15429332 bytes, checksum: 860e668535766ac0d5a17a89cec79398 (MD5) license.txt: 4064 bytes, checksum: d4a8773feb8c62f2e0397c7ea723adce (MD5) Padilla_Fuentes_Yadira.docx: 13433414 bytes, checksum: 04c22d8e8256f395e6163684a7eba924 (MD5) http://hdl.handle.net/2142/34318 en Copyright 2012 Yadira Padilla microchannel refrigerant charge modeling heat exchangers Experimentally validated models of refrigerant distribution in microchannel heat exchangers used to evaluate charge reduction of various working fluids Mechanical Sci & Engineering 1917 Mechanical Engineering 0133 University of Illinois at Urbana-Champaign Thesis M.S. MS:Mechanical Engineerng -UIUC 10KS0133MS