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Title:
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Determination of the enthalpy of PCM as a function of temperature using a heat-flux DSC - A study of different measurement procedures and their accuracy
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Author:
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Castellón, Cecilia; Günther, E.; Mehling, Harald; Hiebler, Stefan; Cabeza, Luisa F.
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Notes:
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Thermal energy storage by latent heat allows storing high amounts of energy working in narrow margins of
temperature. The use of phase change material (PCM) for the latent heat storage has been studied in different
applications and it has been commercialized in containers to transport blood, products sensible to temperature, to
decrease their energy demand. The use of PCM in cooling and refrigeration has been attracting a lot of interest lately,
but for all applications, the properties of these materials need to be known with sufficient accuracy. Regarding heat
storage, it is necessary to know the enthalpy as a function of temperature. The most widely used calorimeter is the heatflux
differential scanning calorimetry (hf-DSC). The objective of this study is to investigate different methods for hf-
DSC analysis, namely the dynamic method and the step method, and to test their accuracy in the determination of
enthalpy–temperature relationship of PCM. For the dynamic method, a strong influence of heating/cooling rate was
observed. For the step method, the resulting enthalpy–temperature relationship is independent of heating/cooling rate.
Commercial PCM RT27 was chosen as sample material to avoid subcooling and kinetic effects in the test
measurements. The approach introduced in this study can be used to carry out similar investigations for other classes of
PCM and/or other DSC instruments.
The work was partially funded with the project
ENE2005-08256-C02-01/ALT |
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Subject(s):
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-cooling thermal storage
-Phase change material
-heat-flux DSC |
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Rights:
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(c) John Wiley & Sons, 2008
info:eu-repo/semantics/restrictedAccess |
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Document type:
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article
publishedVersion |
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Published by:
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John Wiley & Sons
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