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Simulation of Hydrogen Tank Refuelling

Mojarrad, Masih
Master thesis
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URI
https://hdl.handle.net/11250/2688510
Date
2020
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  • Master i teknologi [168]
Abstract
As an alternative to fossil fuels and as a sustainable energy carrier, there are considerable

interestsin investigating hydrogen. Hence, it seems significant to evaluate the behavior of

hydrogen in refueling or storing. The most important issue in refueling the tank pertains

to the temperature. The hydrogen inside the tank heats up during the filling due to the

effect of compression and negative Joule-Thomson coefficient. As a result, the main aim

of this project is to examine the temperature inside the tank to not exceed 85°C in order to

avoid cracking in the wall and consequently, further possible disasters. This can be done

by implementing simulation with a proper software.

OpenFoam is an appropriate software to consider such behaviors and it contributes to

developing and considering the variety of properties including the temperature inside the

tank. The cylindrical geometry is created with blockMesh in 3D while the geometry ends

up with rectangular cubic in 2D. The proper boundary conditions and initial properties are

set up in rhoCentralFoam solver to establish simulations in OpenFoam 5.0.

According to the obtained results, it is found out that it seems necessary to precool inlet

hydrogen to fulfill the main purpose of this project. The bigger inlet area also decreases

the maximum temperature inside the tank however this effect is not that much

considerable compared to precooling. A further point to add is that the position of the inlet

can play a significant role in the final temperature. Acquired results prove that the

direction of inlet velocity should be aligned with the length of cylinder otherwise the

temperature increases significantly.

At last, comparing the final results to what was calculated and expected reveals that the

results have an acceptable concordance and consistency. So, it can be deduced that the

simulations have been done properly and the results can be trusted for further studies or

possible experiments.
Publisher
University of South-Eastern Norway
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