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ECN publication
Heat storage and transformation
Published by: Publication date:
ECN Energy Efficiency in Industry 1-10-2001
ECN report number: Document type:
ECN-RX--01-036 Conference Paper
Number of pages: Full text:
17 Download PDF  

Presented at: ZAE-symposium 2001, 'Heat and cold storage', Munich, Germany, 3-5 oktober 2001.

In order to increase the energy density of a thermal storage unit for domestic use, experiments have been performed with two different PCM types: a salt hydrate and a paraffin. The paraffin shows the best performance, with a useful thermal storage density of more than 2 times that of water.The development of the SWEAT (Salt-Water Energy Accumulation and Transformation) system is directed to cooling applications (5-15°C) in industry and in commercial buildings using waste heat or heat from co-generation at about 80°C. The main focus is on solving the corrosion problem. Therefore a number of polymer coatings were tested under SWEAT conditions and only one combination of epoxy resin with hardener appeared to be applicable. Cycling experiments are currently performed to test the long-term behaviour of the coating under realistic con-ditions. Current research on the high temperature heat transformer for steam generation in industry is focussed on the determination of the thermodynamic and kinetic properties of the working pairs, as well as the heat conductivity. A simulation model in Matlab/Simulink has been developed in order to explore the behaviour and performance as a function of the system layout.

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