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dc.contributor.authorYu, Pei-Yuen_US
dc.contributor.authorLin, Wei-Kengen_US
dc.contributor.authorWang, Chi-Chuanen_US
dc.date.accessioned2014-12-08T15:35:54Z-
dc.date.available2014-12-08T15:35:54Z-
dc.date.issued2014-04-01en_US
dc.identifier.issn0894-1777en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.expthermflusci.2014.01.007en_US
dc.identifier.urihttp://hdl.handle.net/11536/24274-
dc.description.abstractIn this study, investigation of the performance of a tube-in-tube counter-flow water-cooled CO2 gas cooler operating above and near critical pressure is presented using a heat pump water heater with CO2 flowing in the annulus side. A tube-in-tube heat exchanger model applicable for supercritical fluid CO2 and water was also developed and validated. The measured total heat transfer capacity ranged from 1.31 to 4.06 kW at various test conditions. The calculations show good agreement with the experimental results. The results demonstrate that the variation of CO2 temperature tends to show very slow decreasing near the pseudo-critical region when compared to the inlet region. Yet this phenomenon becomes more pronounced as the inlet pressure is close to the critical pressure (73.8 bar). The calculation also reveals a peculiar phenomenon that the local heat transfer rate of the heat exchanger peaks within the heat exchanger near the pseudo critical region due to the drastic rise of specific heat (C-p value). (C) 2014 Elsevier Inc. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectCarbon dioxideen_US
dc.subjectSupercriticalen_US
dc.subjectGas cooleren_US
dc.subjectTube-in-tube heat exchangeren_US
dc.titlePerformance evaluation of a tube-in-tube CO2 gas cooler used in a heat pump water heateren_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.expthermflusci.2014.01.007en_US
dc.identifier.journalEXPERIMENTAL THERMAL AND FLUID SCIENCEen_US
dc.citation.volume54en_US
dc.citation.issueen_US
dc.citation.spage304en_US
dc.citation.epage312en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.identifier.wosnumberWOS:000333785100033-
dc.citation.woscount0-
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