Abstract
Latent heat storages can be used to store thermal energy at a constant temperature. By actively removing the solidified phase change material from the heat exchanger surface during the discharge process, the heat flux can be kept constant and a separation of power and capacity is possible. In the presented rotating drum concept, a cooled drum is partially immersed in a tub of liquid phase change material and rotates in it. Phase change material solidifies at the submerged part of the drum. In addition, adhering liquid phase change material solidifies after the surface has left the tub. In this paper, the additional heat transfer due to adhesion is examined by determining the solidified layer thickness as well as the heat transfer by comparing measurements with adhesion and while eliminating the adhesion with a rubber lip. The measured adhering layer thickness differs by 33% from a presented analytical approach. The transferred heat is increased up to 26 % due to the adhesion.
Highlights
Temperature of liquid Phase Change Material (PCM) outside the drum Tl,PCM and HTF inside the drum THTF can be controlled
At low rotational speeds, the heat transfer increases more when increasing the rotational speed compared to high rotational speeds
Adjustable rubber lip Measured layer thicknesses with a total ∆ T of 15 K
Summary
All experimental details and results can be found in: J. At low rotational speeds, the heat transfer increases more when increasing the rotational speed compared to high rotational speeds
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