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Phase change

Latent heat storage systems

The aggregate state changes

Latent heat storage systems with phase change materials, known as PCMs for short, are based on a simple principle: when solid substances – for example paraffin – melt, they absorb heat from their environment. If the ambient temperature drops, they solidify and release this heat again. Latent heat storage systems usually use the phase transition between solid and liquid states for storing heat.

Temperature profile as a function of the stored heat volume with sensible and latent heat storage

© ZAE Bayern

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Supported by: The Federal Government on the basis of a decision by the German Bundestag

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