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Assessment of durability of solar absorbers : performance criterion

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dc.contributor.authorPáscoa, Soraia
dc.contributor.authorCarvalho, Maria João
dc.contributor.authorCunha Diamantino, Teresa
dc.date.accessioned2019-01-23T12:20:58Z
dc.date.available2019-01-23T12:20:58Z
dc.date.issued2018
dc.description.abstractABSTRACT: Solar fraction, Fs, defined as the ratio between the delivered energy from a solar domestic hot water (DHW) system and the load (thermal energy necessary to satisfy domestic water heating needs), is widely accepted as performance indicator for this type of systems. Considering solar absorptance αs and thermal emittance εt as the most relevant characteristics of solar absorbers, the relation between the depreciation of these optical properties and depreciation of Fs was used by Hollands et al (1992) to define a performance criterion (PC) for assessment of long-term behavior and service life of selective solar absorbers. The PC was established mainly for solar DHW systems working with solar fractions lower than 50%. In this work, systems working with solar fractions higher than 50%, in climates of south of Europe, are considered and the suitability of solar fraction as performance indicator to develop an adequate PC is studied. As a first step simulations of thermal performance of systems using an in-house software were performed for a reduction of 5% and 10% of Fs. In ISO 22975-3, solar fraction Fs degradation must be lower than 5% to guarantee 25 years of service life for DHW system. The results showed that the parameters obtained to define the PC were incoherent considering solar fractions higher than 50%. In a second step, supplied energy was considered as performance indicator and using similar methodology as Hollands et al (1992), but using as performance indicator energy supplied by the solar system, the PC for systems working with solar fractions higher than 50%, in climates of south of Europe, was establish. The results showed that this is not significantly different from the PC considered in ISO 22975-3.pt_PT
dc.description.versioninfo:eu-repo/semantics/acceptedVersionpt_PT
dc.identifier.citationPáscoa, S.; Carvalho, M.J.; Diamantino, T. - Assessment of durability of solar absorbers : performance criterion. In: EuroSun 2018 : 12th International Conference on Solar Energy for Buildings and Industry. Rapperswil, Switzerland, 10-13 September, 2018, 9 p.pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.9/3109
dc.language.isoengpt_PT
dc.relationFCT RECI/EMS-ENE/0170/2012pt_PT
dc.relationFCOMP-01-0124-FEDER-027507pt_PT
dc.relationPOCI-01-0145-FEDER-016709pt_PT
dc.relationFCT PTDC/EMS-ENE/0578/2014pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSolar thermal systemspt_PT
dc.subjectSolar absorver surfacespt_PT
dc.subjectDurabilitypt_PT
dc.subjectPerformance testspt_PT
dc.titleAssessment of durability of solar absorbers : performance criterionpt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceRapperswil, Switzerlandpt_PT
oaire.citation.titleEuroSun 2018 : 12th International Conference on Solar Energy for Buildings and Industrypt_PT
person.familyNamePáscoa
person.familyNameCarvalho
person.familyNameCunha Diamantino
person.givenNameSoraia
person.givenNameMaria João
person.givenNameTeresa
person.identifier.ciencia-id5D16-10AA-AF4E
person.identifier.ciencia-idAB12-0E87-100E
person.identifier.ciencia-idA81C-1FE7-1D42
person.identifier.orcid0000-0002-2015-4547
person.identifier.orcid0000-0001-8763-4847
person.identifier.orcid0000-0002-0481-0460
person.identifier.ridL-4158-2014
person.identifier.ridG-5063-2017
person.identifier.scopus-author-id7201413995
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublication78006590-edd5-4da3-a584-d4909c65e8b7
relation.isAuthorOfPublication612ce7fe-326e-4d96-be54-3b1aa9e64e71
relation.isAuthorOfPublication706d0686-58f1-440b-a903-6f57130b962c
relation.isAuthorOfPublication.latestForDiscovery706d0686-58f1-440b-a903-6f57130b962c

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