A master thesis from Aalborg University
Thermal stress analysis of a Water-Molten Salt Heat Exchanger: Computational Fluid Dynamics with Fluid-Structure Interaction
[Thermal stress analysis of a Water-Molten Salt Heat Exchanger]
Author(s)
Term
4. semester
Education
Publication year
2023
Submitted on
2023-05-31
Pages
71 pages
Abstract
A CFD analysis has been performed for the simulation of a molten sodium hydroxide heat exchanger. Two differ- ent designs were investigated: Double pipe and U-tube heat exchangers for 3 different pressures (1,2 and 5 [bar]) of the working fluid, which was wa- ter. Then the FEM analysis of Ther- mal stress was performed. The sim- ulations ran with the assumption that stress induced by constrained expan- sion is covered by the heat exchanger design apart from one for the atmo- spheric pressure for the U-tube heat exchanger. In this simulation, it was assumed that the baffle is pressed on the heat exchanger tubes and any ex- pansion of the tubes is constrained by the baffle. Additionally, the Factor of Safety for each simulation was com- puted in order to find out, if the stress exceeds the tensile yield strength and thus the elastic range. The compari- son between each of the scenarios re- vealed that considering the same prop- erties and boundary conditions Dou- ble pipe HX produces higher amounts of thermal stress, but still keeps the levels of Factor of Safety at an accept- able level. Moreover, it has been found that it is necessary to apply safety mea- sures to the expansion of the pipes as the Factor of Safety for a case with con- strained expansion was less than 1 and thus elastic range was exceeded and the pipes are irreversibly damaged
Keywords
Documents
Colophon: This page is part of the AAU Student Projects portal, which is run by Aalborg University. Here, you can find and download publicly available bachelor's theses and master's projects from across the university dating from 2008 onwards. Student projects from before 2008 are available in printed form at Aalborg University Library.
If you have any questions about AAU Student Projects or the research registration, dissemination and analysis at Aalborg University, please feel free to contact the VBN team. You can also find more information in the AAU Student Projects FAQs.