{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390865574478802944.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1299/jsmepes.2024.28.d141"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/jsmepes/2024.28/0/2024.28_D141/_pdf"}}],"dc:title":[{"@language":"en","@value":"Comparison Between a Fuel Cell and an Engine -in Thermodynamic View-"},{"@language":"ja","@value":"熱力学的考察による燃料電池とエンジンの比較"}],"dc:language":"ja","description":[{"type":"abstract","notation":[{"@language":"en","@value":"<p>Fuel cells are said to be more efficient than combustion engines. But, is this true? The Carnot factor indicates the maximum efficiency of a combustion engine, and Δ<i>G</i><sub>rxn</sub> / Δ<i>H</i><sub>rxn</sub> (Gibbs energy change divided by enthalpy change for a reaction) gives that of a fuel cell. Clearly, the expression for the maximum efficiency differs between them. Hence, this comparison is not reasonable. This study aims to provide a reasonable comparison with theoretical calculations based on a thermodynamic model. The model developed in this study assumes that a fuel cell consists of only one reactor, a so-called cell. An isothermal combustion engine comprises multiple series of combustors (high temperature heat sources), Carnot cycle engines and low temperature sinks. In addition to these components, an adiabatic combustion engine embeds a heat exchanger. The processes in the fuel cell and the combustor progress under constant atmospheric pressure. To ensure a reasonable comparison, the inlet and outlet for both fuel cell and combustion engine specify just reactants (fuel and oxygen) and products (water) at standard condition, respectively. Theoretical calculations based on these models indicate the maximum efficiencies (W/Δ<i>H</i><sub>rxn</sub>(<i>T</i><sub>0</sub>)) of 95% for a fuel cell, 92% for an isothermal combustion engine, and 77% for an adiabatic combustion engine, respectively. In addition to the entropy generation by mixing hydrogen and oxygen gases, temperature dependence of the enthalpy and entropy changes leads to a slightly less efficiency of an isothermal combustion engine than a fuel cell. The entropy generation with an adiabatic process results in a significant drop in the efficiency of an adiabatic combustion engine.</p>"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410865574478802946","@type":"Researcher","foaf:name":[{"@language":"en","@value":"KAGUCHI Hiroyuki"},{"@language":"ja","@value":"賀口 浩行"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"九州大学"},{"@language":"en","@value":"Kyushu University"}]},{"@id":"https://cir.nii.ac.jp/crid/1410865574478802944","@type":"Researcher","foaf:name":[{"@language":"en","@value":"NAKAJIMA Hironori"},{"@language":"ja","@value":"中島 裕典"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"九州大学"},{"@language":"en","@value":"Kyushu University"}]},{"@id":"https://cir.nii.ac.jp/crid/1410865574478802945","@type":"Researcher","foaf:name":[{"@language":"en","@value":"ITO Kohei"},{"@language":"ja","@value":"伊藤 衡平"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"九州大学"},{"@language":"en","@value":"Kyushu University"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"24242950"}],"prism:publicationName":[{"@language":"ja","@value":"動力・エネルギー技術の最前線講演論文集 : シンポジウム"},{"@language":"en","@value":"The Proceedings of the National Symposium on Power and Energy Systems"},{"@language":"ja","@value":"動エネシンポ"}],"dc:publisher":[{"@language":"en","@value":"The Japan Society of Mechanical Engineers"},{"@language":"ja","@value":"一般社団法人 日本機械学会"}],"prism:publicationDate":"2024","prism:volume":"2024.28","prism:number":"0","prism:startingPage":"D141"},"reviewed":"false","jpcoar:conferenceName":"第28回 動力・エネルギー技術シンポジウム","url":[{"@id":"https://www.jstage.jst.go.jp/article/jsmepes/2024.28/0/2024.28_D141/_pdf"}],"availableAt":"2024","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Fuel%20cell","dc:title":"Fuel cell"},{"@id":"https://cir.nii.ac.jp/all?q=Isothermal%20engine","dc:title":"Isothermal engine"},{"@id":"https://cir.nii.ac.jp/all?q=Adiabatic%20engine","dc:title":"Adiabatic engine"},{"@id":"https://cir.nii.ac.jp/all?q=Efficiency%20comparison","dc:title":"Efficiency comparison"},{"@id":"https://cir.nii.ac.jp/all?q=Thermodynamics","dc:title":"Thermodynamics"},{"@id":"https://cir.nii.ac.jp/all?q=Fuel%20cell","dc:title":"Fuel cell"},{"@id":"https://cir.nii.ac.jp/all?q=Isothermal%20engine","dc:title":"Isothermal engine"},{"@id":"https://cir.nii.ac.jp/all?q=Adiabatic%20engine","dc:title":"Adiabatic engine"},{"@id":"https://cir.nii.ac.jp/all?q=Efficiency%20comparison","dc:title":"Efficiency comparison"},{"@id":"https://cir.nii.ac.jp/all?q=Thermodynamics","dc:title":"Thermodynamics"}],"dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:2013608313"},{"@type":"CROSSREF","@value":"10.1299/jsmepes.2024.28.d141"}]}