Flat Plate Collectors with Thermochromic Absorber Coatings to Reduce Loads during Stagnation

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dc.identifier.uri http://dx.doi.org/10.15488/4481
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/4521
dc.contributor.author Föste, Sebastian
dc.contributor.author Pazidis, Alexandra
dc.contributor.author Reineke-Koch, Rolf
dc.contributor.author Hafner, Bernd
dc.contributor.author Mercs, David
dc.contributor.author Delord, Christine
dc.date.accessioned 2019-03-06T09:34:02Z
dc.date.available 2019-03-06T09:34:02Z
dc.date.issued 2016
dc.identifier.citation Föste, S.; Pazidis, A.; Reineke-Koch, R.; Hafner, B.; Mercs, D. et al.: Flat Plate Collectors with Thermochromic Absorber Coatings to Reduce Loads during Stagnation. In: Energy Procedia 91 (2016), S. 42-48. DOI: https://doi.org/10.1016/j.egypro.2016.06.169
dc.description.abstract Thermochromic absorber coatings, which switch their emissivity for thermal radiation depending on temperature, are developed to reduce the stagnation temperature of solar thermal collectors: In the operating range of the collector, the surface exhibits a low emissivity (ϵ = 10%). At higher temperatures, the emissivity is increased by a multiple (ϵ = 35%). Thus, the collector heat losses raise and the stagnation temperature is reduced. Efficiency measurements on a prototype collector employing this thermochromic absorber show, that below the switching temperature the efficiency is nearly identical to that of a conventional collector with a highly selective absorber plate. Due to the increased emissivity in the switched state of the coating, the stagnation temperature is lowered by more than 30 K. System simulations exhibit, that the performance of the system is not significantly affected: in a combined system for space heating and domestic hot water preparation the conventional energy demand of the gas boiler is increased by 1.5% to 4.5% using the thermochromic collector instead of a standard collector. In contrast, the duration when formation of vapour in the collector circuit occurs, is reduced by 70% to 75%. By further optimizing thermochromic collectors, the formation of vapour in the solar circuit could be completely prevented during stagnation. This would allow the use of lower cost materials in the solar circuit and reduce the cost of installation and maintenance of the solar circuit significantly. eng
dc.language.iso eng
dc.publisher London : Elsevier Ltd.
dc.relation.ispartof 4th International Conference on Solar Heating and Cooling for Buildings and Industry, SHC 2015, December 2-4, 2015, Istandbul, Turkey
dc.relation.ispartofseries Energy Procedia 91 (2016)
dc.rights CC BY-NC-ND 4.0
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject flat plate collector eng
dc.subject overheating protection eng
dc.subject stagnation temperature eng
dc.subject system simulation eng
dc.subject thermochromic absorber coating eng
dc.subject Coatings eng
dc.subject Dust collectors eng
dc.subject Electromagnetic wave emission eng
dc.subject Solar collectors eng
dc.subject Solar heating eng
dc.subject Absorber coatings eng
dc.subject Domestic hot water preparation eng
dc.subject Efficiency measurement eng
dc.subject Flat-plate collector eng
dc.subject Overheating protection eng
dc.subject Solar thermal collector eng
dc.subject Switching temperatures eng
dc.subject System simulations eng
dc.subject Collector efficiency eng
dc.subject.ddc 620 | Ingenieurwissenschaften und Maschinenbau ger
dc.title Flat Plate Collectors with Thermochromic Absorber Coatings to Reduce Loads during Stagnation
dc.type article
dc.type Text
dc.type conferenceObject
dc.relation.issn 1876-6102
dc.relation.doi https://doi.org/10.1016/j.egypro.2016.06.169
dc.bibliographicCitation.volume 91
dc.bibliographicCitation.firstPage 42
dc.bibliographicCitation.lastPage 48
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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