Numerical model of solar external receiver tubes: Influence of mechanical boundary conditions and temperature variation in thermoelastic stresses

Montoya Sancha, Andrés; Rodríguez Sánchez, María de los Reyes; López Puente, Jorge; Santana Santana, Domingo José

Publication:
Numerical model of solar external receiver tubes: Influence of mechanical boundary conditions and temperature variation in thermoelastic stresses

dc.affiliation.dpto	UC3M. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras	es
dc.affiliation.dpto	UC3M. Departamento de Ingeniería Térmica y de Fluidos	es
dc.affiliation.grupoinv	UC3M. Grupo de Investigación: Dinámica de Estructuras Ligeras	es
dc.affiliation.grupoinv	UC3M. Grupo de Investigación: Ingeniería de Sistemas Energéticos	es
dc.contributor.author	Montoya Sancha, Andrés
dc.contributor.author	Rodríguez Sánchez, María de los Reyes
dc.contributor.author	López Puente, Jorge
dc.contributor.author	Santana Santana, Domingo José
dc.contributor.funder	Ministerio de Economía y Competitividad (España)	es
dc.date.accessioned	2022-01-31T08:56:29Z
dc.date.available	2022-01-31T08:56:29Z
dc.date.issued	2018-11-01
dc.description.abstract	Failure in solar external receivers is mainly originated from the thermal stress, caused by the high non-uniform transient solar flux. The heat-up and cooldown of tube receivers in daily cycles produce low-cycle fatigue that limits the lifetime of tubes. The corrosion of tube materials produced by incompatibility between the decomposed heat transfer fluid and tube material may increase this issue. The temperature spatial distribution in these tubes has strong variations in radial, circumferential, and axial directions. The stress field, produced by the temperature gradients, has been commonly analyzed using bidimensional models in isolated tube cross sections, without taking into account the axial temperature variation, the mechanical boundary conditions, and the temperature-dependent thermomechanical properties. In this work, a three-dimensional finite element model has been developed in order to calculate the stress field distribution, without performing any geometrical simplification. In addition, appropriate mechanical boundary conditions have been imposed in order to adequately simulate the tube behavior. Besides, radial, circumferential and axial temperature variations have been studied separately to analyze how each of them influences the maximum stress distribution. This 3D modelhas been compared with analytical solutions for the two-dimensional thermal stress problem incircular hollow cylinders. The results show that the boundary conditions have a significant effect on the tube stresses, increasing the axial stress component and therefore the equivalent stress. The analysis of each of the temperature variations showed that the circumferential variationtemperature is the one that produces most of the stress, since it tries to strongly bend the tube, which is impeded by the boundary conditions. The results also present that 2D models are not capable of obtaining the correct stress distribution along the tube, since they are not taking into account the lo	en
dc.description.sponsorship	This work has been supported by the Iberdrola Foundation Spain under the fellowship "Ayudas a la investigación en energía y medio ambiente". M.R. Rodríguez-Sánchez and D. Santana would like to thank the Ministerio de Economía y Competitividad the support of the project ENE2015-69486-R (MINECO/FEDER, UE).	en
dc.format.extent	11
dc.identifier.bibliographicCitation	Montoya, A., Rodríguez-Sánchez, M., López-Puente, J. & Santana, D. (2018). Numerical model of solar external receiver tubes: Influence of mechanical boundary conditions and temperature variation in thermoelastic stresses. Solar Energy, 174, 912–922.	en
dc.identifier.doi	https://doi.org/10.1016/j.solener.2018.09.068
dc.identifier.issn	0038-092X
dc.identifier.publicationfirstpage	912
dc.identifier.publicationlastpage	922
dc.identifier.publicationtitle	Solar Energy	en
dc.identifier.publicationvolume	174
dc.identifier.uri	https://hdl.handle.net/10016/33992
dc.identifier.uxxi	AR/0000022843
dc.language.iso	eng	en
dc.publisher	Elsevier	en
dc.relation.projectID	Gobierno de España. ENE2015-69486-R	es
dc.rights	© 2018 Elsevier Ltd. All rights reserved.	en
dc.rights	Atribución-NoComercial-SinDerivadas 3.0 España	*
dc.rights.accessRights	open access	en
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/es/	*
dc.subject.eciencia	Energías Renovables	es
dc.subject.eciencia	Ingeniería Mecánica	es
dc.subject.other	Solar external receiver	en
dc.subject.other	Thermal stress	en
dc.subject.other	Temperature gradients	en
dc.subject.other	Thin-walled cylinder	en
dc.subject.other	Thermal-stresses	en
dc.title	Numerical model of solar external receiver tubes: Influence of mechanical boundary conditions and temperature variation in thermoelastic stresses	en
dc.type	research article	*
dc.type.hasVersion	AM	*
dspace.entity.type	Publication