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dc.contributor.authorSian, Rony A.en_US
dc.contributor.authorWang, Chi-Chuanen_US
dc.date.accessioned2018-08-21T05:54:23Z-
dc.date.available2018-08-21T05:54:23Z-
dc.date.issued2017-09-01en_US
dc.identifier.issn1359-4311en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.applthermaleng.2017.05.187en_US
dc.identifier.urihttp://hdl.handle.net/11536/145882-
dc.description.abstractA constraints-free transcritical CO2 heat pump model for medium and large system applications is proposed and validated through experimental measurements. The model features five components, namely: compressor, chevron-type plate heat exchanger as gas cooler, expansion valve, fin-and-tube evaporator and chevron-type plate internal heat exchanger. Unlike existing models, the proposed model takes into account the detailed geometric characteristics of each component at a wide range of operating conditions without imposing any constraints, such as constant temperatures and pressures. Parametric studies regarding the influence of relevant operating and design parameters, such as ambient temperature, water inlet temperature and chevron inclination angle are conducted and a brief discussion on pressure optimization regarding the influence of compressor speed, expansion valve openness and number of plates at the internal heat exchanger is carried out. Comparison between the experiments and simulations showed that the model accurately reflects the actual system with a maximum error of 9.6% and 3.9% for the coefficient of performance and heating capacity, respectively. The parametric examinations are thoroughly compared to results published in literatures. In essence, the results showed that the COP and the heating capacity simultaneously increase with dry bulb temperature and chevron inclination angle, reaching a maximum at about 70, while the effects of water inlet temperature are more significant and opposite to that of dry bulb temperature. (C) 2017 Elsevier Ltd. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectHeat pump systemen_US
dc.subjectConstrains-free modelen_US
dc.subjectTranscritical CO2 cycleen_US
dc.subjectOptimal pressureen_US
dc.titleConstraints-free modeling and experimental validation of a transcritical CO2 system for medium and large scale applicationsen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.applthermaleng.2017.05.187en_US
dc.identifier.journalAPPLIED THERMAL ENGINEERINGen_US
dc.citation.volume124en_US
dc.citation.spage136en_US
dc.citation.epage151en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.identifier.wosnumberWOS:000407185000013en_US
Appears in Collections:Articles