Experimental and numerical study of the heat transfer process during the startup of molten salt tower receivers

dc.affiliation.dptoUC3M. Departamento de Ingeniería Térmica y de Fluidoses
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Ingeniería de Sistemas Energéticoses
dc.contributor.authorFernández Torrijos, María
dc.contributor.authorSobrino Fernández, Celia
dc.contributor.authorMarugán Cruz, Carolina
dc.contributor.authorSantana Santana, Domingo José
dc.contributor.funderMinisterio de Ciencia, Innovación y Universidades (España)es
dc.description.abstractDuring the startup operation of molten salt solar tower plants, the tubes of the receiver are subjected to a high nonhomogeneous heat flux along with a low heat transfer coefficient to the air inside the tube, which results in a highly uneven angular temperature distribution. This uneven temperature distribution causes thermal stresses and tube deflection in the receiver. The most important constraint for the design and operation of central receivers is to keep the intercepting solar flux within the tube mechanical safety limits. In this work, an experimental facility consisting of a molten salt loop that simulates a solar tower receiver tube is used to measure the outer surface temperature and the deflection of the tube under the startup operating conditions of a solar tower power plant. An inverse heat transfer problem is applied to obtain the heat flux onto the receiver tube from the outer surface temperature measurements. To solve the inverse problem, a transient three-dimensional numerical model of an empty circular pipe subjected to a nonhomogeneous heat flux is developed. A good agreement between the experimental and calculated tube temperatures and deflection is observed, with differences of 7% and 10%, respectively. Moreover, the thermal stresses are calculated. It has been found that higher thermal stresses are obtained when the tube is preheated compared to the stress when the molten salt is flowing under similar heat flux conditions.en
dc.description.sponsorshipThis work was partially funded by the Ministerio de Eduación, Cultura y Deporte para la Formación de Profesorado Universitario (FPU-04941) and the Ministerio de Ciencia, Innovación y Universidades (RTI2018-096664-B-C21 (MICINN/FEDER, UE)) of the Spanish Governmenten
dc.format.extent51 p.
dc.identifier.bibliographicCitationFernández-Torrijos, M., Sobrino, C., Marugán-Cruz, C., & Santana, D. (2020). Experimental and numerical study of the heat transfer process during the startup of molten salt tower receivers. Applied Thermal Engineering, 178, 115528
dc.identifier.publicationtitleApplied Thermal Engineering
dc.relation.projectIDGobierno de España. RTI2018-096664-B-C21
dc.rights© 2020 Elsevier Ltd.
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.rights.accessRightsopen access
dc.subject.ecienciaEnergías Renovableses
dc.subject.otherInverse heat conduction problemen
dc.subject.otherInduction coilen
dc.subject.otherCentral receiveren
dc.subject.otherTube bendingen
dc.titleExperimental and numerical study of the heat transfer process during the startup of molten salt tower receiversen
dc.typeresearch article*
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