
<strong>Paper Title</strong><br>
Geometric Optimization Of High Temperature Shell And Tube Latent Heat Thermal Energy Storage<br>
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<strong>Abstract</strong><br>
A simple geometry shell and tube heat exchanger provides a straightforward design for near-term integration of
latent heat thermal energy storage systems in concentrated solar thermal plants, but currently there is no literature available
for this configuration in the 286-565 ˚C temperature range. Therefore, the objective of this work is to evaluate the potential
of this configuration for CST-tower plants by proposing a proper design method. The work has been done by optimizing the
main geometric parameters involved along with considering a market ready phase change material (H500 salt). The
optimization consisted of fixing the PCM volume while varying the other geometric parameters simultaneously over a wide
range. The goal was to achieve the highest amount of total stored/delivered energy in a certain amount of time with a
minimum heat transfer surface area. For the selected PCM, the optimum area was found 36-63 m2.GJ-1 (0.12-0.22 m2.kWhth
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1). The storage charging and discharging efficiency for the selected PCM over a cycle of continuous charging and
discharging were found ~99% and 85%, respectively. The results also imply that the shell and tube LHTES system is
technically competitive with the conventional two-tank molten salts because of its high efficiency.
Keywords— High temperature, Phase change material, Optimization, Shell and tube tank