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From research into practice

Paraffin slurries are starting to find their way from research into practical use. A prerequisite is that stable dispersions for different temperature ranges are available at competitive production costs. The researchers tested the cooling of an actual building using the Counter Entropy House. The 46 m2 solar house was built by Aachen students as their competition entry for Solar Decathlon 2012, which was held during the summer in Madrid. The building’s entire living space is furnished with a ceiling of cooling panels. During the day, a paraffin-water dispersion absorbs the heat from the rooms and stores it in three tanks. At night, the solar collectors dissipate the stored heat. The cooling concept worked and the paraffin-water dispersion proved to be stable.

The researchers at Fraunhofer UMSICHT now offer customised dispersions for transporting cooling and heating energy under the brand name CryoSol®plus. A variant of the fluids was developed for temperatures between 5 and 20 °C as an alternative to cold water in cooling systems. In other compositions, the dispersions cover the temperature range from 25 to 45 °C and are designed for transporting or storing low-temperature heat.

Scientists at Fraunhofer ISE are also working on new paraffin dispersions with phase change temperatures between 6 and 30 °C. The German Federal Ministry for Economic Affairs and Energy is funding the KOLAN project as part of the Energy Storage research initiative. The research work is continuing until September 2016. The scientists want to develop cost-effective phase change emulsions with a high storage capacity and good stability. The emulsions are being tested and evaluated in a pilot plant at Imtech -Deutschland GmbH under realistic conditions.

Projektinfo 18/2015:
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Addresses

Experimental testing and simulations
RWTH Aachen, E.ON ERC, GRK

Development of paraffin-water dispersions
Fraunhofer UMSICHT

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BINE-Projektinfo 18/2015
(PDF, 4 pages, 654 kB)

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