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Article: Efficiency and its bounds for thermal engines at maximum power using Newton's law of cooling

TitleEfficiency and its bounds for thermal engines at maximum power using Newton's law of cooling
Authors
KeywordsCarnot engines
Cooling stage
Engine models
Heat capacities
Heat transfer process
Issue Date2012
PublisherAmerican Physical Society. The Journal's web site is located at http://pre.aps.org
Citation
Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), 2012, v. 85 n. 1, article no. 011146 How to Cite?
AbstractWe study a thermal engine model for which Newton's cooling law is obeyed during heat transfer processes. The thermal efficiency and its bounds at maximum output power are derived and discussed. This model, though quite simple, can be applied not only to Carnot engines but also to four other types of engines. For the long thermal contact time limit, new bounds, tighter than what were known before, are obtained. In this case, this model can simulate Otto, Joule-Brayton, Diesel, and Atkinson engines. While in the short contact time limit, which corresponds to the Carnot cycle, the same efficiency bounds as that from Esposito are derived. In both cases, the thermal efficiency decreases as the ratio between the heat capacities of the working medium during heating and cooling stages increases. This might provide instructions for designing real engines. © 2012 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/145928
ISSN
2014 Impact Factor: 2.288
2015 SCImago Journal Rankings: 0.999
ISI Accession Number ID
Funding AgencyGrant Number
US Department of Energy, Office of ScienceDE-FG02-03ER46093
Funding Information:

This work was supported by the US Department of Energy, Office of Science under Grant No. DE-FG02-03ER46093. H. Yan thanks professor M. W. Snow for support. We thank Dr. Changbo Fu, E. Smith, and Zhaowen Tang for stimulating discussions. We also thank one of the referees of the previous version of this paper for providing us with very instructive suggestions and valuable references.

 

DC FieldValueLanguage
dc.contributor.authorYan, Hen_US
dc.contributor.authorGuo, Hen_US
dc.date.accessioned2012-03-27T09:02:10Z-
dc.date.available2012-03-27T09:02:10Z-
dc.date.issued2012en_US
dc.identifier.citationPhysical Review E (Statistical, Nonlinear, and Soft Matter Physics), 2012, v. 85 n. 1, article no. 011146en_US
dc.identifier.issn1539-3755-
dc.identifier.urihttp://hdl.handle.net/10722/145928-
dc.description.abstractWe study a thermal engine model for which Newton's cooling law is obeyed during heat transfer processes. The thermal efficiency and its bounds at maximum output power are derived and discussed. This model, though quite simple, can be applied not only to Carnot engines but also to four other types of engines. For the long thermal contact time limit, new bounds, tighter than what were known before, are obtained. In this case, this model can simulate Otto, Joule-Brayton, Diesel, and Atkinson engines. While in the short contact time limit, which corresponds to the Carnot cycle, the same efficiency bounds as that from Esposito are derived. In both cases, the thermal efficiency decreases as the ratio between the heat capacities of the working medium during heating and cooling stages increases. This might provide instructions for designing real engines. © 2012 American Physical Society.-
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://pre.aps.orgen_US
dc.relation.ispartofPhysical Review E (Statistical, Nonlinear, and Soft Matter Physics)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.subjectCarnot engines-
dc.subjectCooling stage-
dc.subjectEngine models-
dc.subjectHeat capacities-
dc.subjectHeat transfer process-
dc.titleEfficiency and its bounds for thermal engines at maximum power using Newton's law of coolingen_US
dc.typeArticleen_US
dc.identifier.emailYan, H: haiyan@umail.iu.eduen_US
dc.identifier.emailGuo, H: guohao@hku.hk, guohao.ph@gmail.com-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevE.85.011146-
dc.identifier.scopuseid_2-s2.0-84856657304-
dc.identifier.hkuros199052en_US
dc.identifier.volume85en_US
dc.identifier.issue1, article no. 011146-
dc.identifier.isiWOS:000299988700006-
dc.publisher.placeUnited States-

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