Dimensional analysis on the evaporation and condensation of refrigerant R-134a in minichannel plate heat exchangers

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dc.contributor.author Jokar, Amir
dc.contributor.author Hosni, Mohammad H.
dc.contributor.author Eckels, Steven J.
dc.date.accessioned 2019-02-19T22:54:56Z
dc.date.available 2019-02-19T22:54:56Z
dc.date.issued 2006
dc.identifier.uri http://hdl.handle.net/2097/39432
dc.description Citation: Jokar, A., Hosni, M. H., & Eckels, S. J. (2006). Dimensional analysis on the evaporation and condensation of refrigerant R-134a in minichannel plate heat exchangers. Applied Thermal Engineering, 26(17), 2287–2300. https://doi.org/10.1016/j.applthermaleng.2006.03.015
dc.description.abstract Two-phase flow analysis for the evaporation and condensation of refrigerants within the minichannel plate heat exchangers is an area of ongoing research, as reported in the literatures reviewed in this article. The previous studies mostly correlated the two-phase heat transfer and pressure drop in these minichannel heat exchangers using theories and empirical correlations that had previously been established for two-phase flows in conventional macrochannels. However, the two-phase flow characteristics within micro/minichannels may be more sophisticated than conventional macrochannels, and the empirical correlations for one scale may not work for the other one. The objective of this study is to investigate the parameters that affect the two-phase heat transfer within the minichannel plate heat exchangers, and to utilize the dimensional analysis technique to develop appropriate correlations. For this purpose, thermo-hydrodynamic performance of three minichannel brazed-type plate heat exchangers was analyzed experimentally in this study. These heat exchangers were used as the evaporator and condenser of an automotive refrigeration system where the refrigerant R-134a flowed on one side and a 50% glycol–water mixture on the other side in a counter-flow configuration. The heat transfer coefficient for the single-phase flow of the glycol–water mixture was first obtained using a modified Wilson plot technique. The results from the single-phase flow analysis were then used in the two-phase flow analysis, and correlations for the refrigerant evaporation and condensation heat transfer were developed. Correlations for the single-phase and two-phase Fanning friction factors were also obtained based on a homogenous model. The results of this study showed that the two-phase theories and correlations that were established for conventional macrochannel heat exchangers may not hold for the minichannel heat exchangers used in this study.
dc.relation.uri https://doi.org/10.1016/j.applthermaleng.2006.03.015
dc.rights This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
dc.rights.uri http://rightsstatements.org/vocab/InC/1.0/
dc.rights.uri https://www.elsevier.com/about/policies/sharing
dc.subject Condensation
dc.subject Dimensional analysis
dc.subject Enhanced heat transfer
dc.subject Evaporation
dc.subject Minichannels
dc.subject Plate heat exchangers
dc.title Dimensional analysis on the evaporation and condensation of refrigerant R-134a in minichannel plate heat exchangers
dc.type Text
dc.date.published 2006
dc.citation.doi 10.1016/j.applthermaleng.2006.03.015
dc.citation.epage 2300
dc.citation.issn 1359-4311
dc.citation.issue 17
dc.citation.jtitle Applied Thermal Engineering
dc.citation.spage 2287
dc.citation.volume 26
dc.citation Jokar, A., Hosni, M. H., & Eckels, S. J. (2006). Dimensional analysis on the evaporation and condensation of refrigerant R-134a in minichannel plate heat exchangers. Applied Thermal Engineering, 26(17), 2287–2300. https://doi.org/10.1016/j.applthermaleng.2006.03.015
dc.description.version Article: Submitted Manuscript


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This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). Except where otherwise noted, the use of this item is bound by the following: This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

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