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Autor/a:
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Cabeza, Luisa F.; Illa i Alibés, Josep; Roca Enrich, Joan; Badia Pascual, Ferran; Mehling, Harald; Hiebler, Stefan; Ziegler, F.
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Notas:
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During the last decades, energy storage has become more and
more important. It is required in order to utilize alternative energy
sources, which often are available at times when energy is not
needed. The main applications of PCMs (Phase Change Materials)
in thermal energy storage are when space restrictions limit larger
thermal storage units. But widespread use of latent heat stores
has not been realized till today due to two main problems: the
low heat flux, and the insufficient long term stability of the storage
materials and containers. In the present work, we studied this second
problem selecting different common metals (aluminum, brass,
copper, steel, and stainless steel) and testing their corrosion resistance
in contact with salt hydrates that are used as PCMs (zinc nitrate
hexahydrate, sodium hydrogen phosphate dodecahydrate, calcium
chloride hexahydrate). The method used was the immersion
corrosion test. The tests here presented and evaluated were short
term. As a consequence of the results from the experiments several
pairs can be ruled out. The combinations of zinc nitrate hexahydrate
with stainless steel, sodium hydrogen phosphate dodecahydrate
with brass, copper and stainless steel, and calcium chloride hexahydrate
with brass and copper shared no significant corrosion in the
short term and should be studied further. |
