Chemical cooling

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As a chemical cooling is called a short-term, one-time cooling , which with the help of endothermic (heat consuming) chemical reactions can be carried out.

application

The effect is used in fire protection technology . For example, plaster of paris contains crystal water that can be given off by the heat of a fire. The gypsum is converted into anhydrite via the intermediate stage bassanite . The evaporation of the water partially absorbs the energy of the fire and can thus cool fire protection equipment.

In addition to the release of crystal water, reactions such as the dehydration of aluminum or magnesium hydroxide to form the oxide are also suitable as a cooling reaction.

  • 2 Al (OH) 3 → Al 2 O 3 + 3 H 2 O
  • Mg (OH) 2 → MgO + H 2 O

Web links

literature

  • Investigations into the systematic development of intumescent high-performance fire protection coatings , by Sebastian Simon, Fraunhofer IRB Verlag, 2006, 129 pages, ISBN 978-3-8167-7201-9