• Jakub Naider
4. semester, Sustainable Energy Engineering, Master (Master Programme)
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
SpecialisationProcess Engineering and Combustion Technology
Publication date31 May 2023
Number of pages71
External collaboratorHyme
Thermal Hydraulics Engineer Mark Søndergaard Sørensen mss@hyme.energy
Information group
ID: 532398978