Non-isentropic study of a closed-circuit oscillating-water-column wave energy converter

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dc.contributor.author Benreguig, Pierre
dc.contributor.author Vicente, Miguel
dc.contributor.author Crowley, Sarah
dc.contributor.author Murphy, Jimmy
dc.date.accessioned 2020-01-29T11:57:49Z
dc.date.available 2020-01-29T11:57:49Z
dc.date.issued 2019-11-19
dc.identifier.citation Benreguig, P., Vicente, M., Crowley, S. and Murphy, J. (2020) 'Non-isentropic study of a closed-circuit oscillating-water-column wave energy converter', Ocean Engineering, 195, 106700 (14pp). doi: 10.1016/j.oceaneng.2019.106700 en
dc.identifier.volume 195 en
dc.identifier.startpage 1 en
dc.identifier.endpage 14 en
dc.identifier.issn 0029-8018
dc.identifier.uri http://hdl.handle.net/10468/9580
dc.identifier.doi 10.1016/j.oceaneng.2019.106700 en
dc.description.abstract The thermodynamics of the air inside a conventional Oscillating Water Column (OWC) is commonly modelled using the isentropic relationship between pressure and density. The innovative Tupperwave device is based on the OWC concept but uses non-return valves and two extra reservoirs to rectify the flow into a smooth unidirectional air flow harnessed by a unidirectional turbine. The air, flowing in closed-circuit, experiences a temperature increase due to viscous losses across the valves and turbine along the repetitive cycles of the device's operation. In order to study this temperature increase which represents a potential issue for the device operation, a non-isentropic wave-to-wire model of the Tupperwave device is developed taking into account the irreversible thermodynamic processes. The model is based on the First Law of Thermodynamics, and accounts for viscous losses at the valves and turbine as well as solar radiation and heat transfer across the device walls and inner free-surface. The results reveal that the temperature increase in the device remains harmless for its operation. The difference between the power performance of the Tupperwave device based on the non-isentropic and isentropic models is found to be relatively small. Its performance are also compared to the corresponding conventional OWC device. en
dc.description.sponsorship Horizon 2020 (OCEANERA-NET European Network OCN/00028) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier Ltd. en
dc.relation.uri http://www.sciencedirect.com/science/article/pii/S0029801819308157
dc.rights © 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license. en
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/ en
dc.subject Wave energy en
dc.subject Oscillating water column en
dc.subject Non-isentropic study en
dc.subject Tupperwave en
dc.subject Energy balance en
dc.subject Valves en
dc.title Non-isentropic study of a closed-circuit oscillating-water-column wave energy converter en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother James Murphy, School Of Engineering, University College Cork, Cork, Ireland. +353-21-490-3000 Email: jimmy.murphy@ucc.ie en
dc.internal.availability Full text available en
dc.check.info Access to this article is restricted until 24 months after publication by request of the publisher. en
dc.check.date 2021-11-19
dc.date.updated 2020-01-29T11:50:50Z
dc.description.version Accepted Version en
dc.internal.rssid 500687886
dc.contributor.funder Horizon 2020 en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Ocean Engineering en
dc.internal.copyrightchecked Yes
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress jimmy.murphy@ucc.ie en
dc.identifier.articleid 106700 en


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© 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license. Except where otherwise noted, this item's license is described as © 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license.
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