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51707-IC-1-2005-1-CZ-ERASMUS-IPUC-3 is required to break down the bonds between the wax molecules. The heat is stored as latent heat. When the paraffin returns to its solid state, the latent heat absorbed during the day is released again. These materials that use thermal energy to change their state, for instance from solid to liquid, are described as phase change materials [2]. Fig.2. Paraffin and wax based phase change materials RUBITHERM® RT [3] 6. CONCLUSIONS The different technologies for thermal energy storage can be used in a huge variety of applications. Domestic hot water, space heating and cooling are probably the most common ones. Most of the sensible thermal energy storage systems are operated for that purpose. Heat storage technologies enable the utilization of summer solar heat for winter heating. With compact heat stores, micro cogeneration technologies (e.g. fuel cells) can be operated more efficiently, following the electricity demand at every moment. In short, every device that needs heat to supply its service can be used more effectively when it is equipped with a compact and efficient heat storage technology. 7. REFERENCES [1] International Energy Agency: Energy Conservation through Energy Storage Programme. [online], [published: March 2006], [cited: July 2007], available on internet < http://www.iea- eces.org/files/brochure06.pdf > [2] Niesing B.: Storing heat with wax. [online], Fraunhofer magazine 1.2004, pp. 36-37 [published: January 2004], [cited: July 2007], available on internet < http://www.fraunhofer.de/fhg/Images/magazine1- 2004_tcm6-10187.pdf > ISSN 1617-1438 [3] RUBITHERM® RT: Latent Heat Paraffins. [online], [cited: July 2007], available on internet < http://www.rubitherm.com/english/pages/02a_latent_heat_paraffins.htm > This work was supported by Scientific Grant Agency of the Ministry of Education of Slovak Republic and the Slovak Academy of Sciences under the project VEGA No. 1/3141/06. Author address: Ing. Dušan Medveď Department of Electric Power Engineering FEI TU Mäsiarska 74 042 01 Košice, Slovak Republic E-mail: Dusan.Medved@tuke.sk Tel: +421 55 602 3564 Ing. Marek Hvizdoš, PhD. Department of Electric Power Engineering FEI TU Mäsiarska 74 042 01 Košice, Slovak Republic E-mail: Marek.Hvizdos@tuke.sk Tel: +421 55 602 3556 27PDF Image | ACCUMULATION OF THERMAL ENERGY
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