New materials and technologies make it possible to use thermal energy more efficiently. How to deve

New materials and technologies make it possible to use thermal energy more efficiently. How to develop spaces and industrial processes cool or heat Researchers at the Fraunhofer Alliance provide power at the Hannover Messe (April colsec 7 to 11) in Hall 13, Stand C10 ago.
Zeolites colsec are crystalline mineral having a porous framework structure, on the surface to attach other substances. If the material in contact with water vapor, it binds these and heat is generated. Fraunhofer IGB
Imposing building with glass facades, steel and concrete skyscrapers dominate the skyline in many industrialized countries. But the impressive buildings often have a disadvantage. In the summer they heat up. Therefore, they usually have to be air-conditioned complex. Even now require refrigeration and air conditioning systems in Germany about 14 percent of the annual electricity demand. And experts expect the will triple to cooling areas up to 2020. Cooling with metal-organic frameworks An alternative to conventional air conditioning are thermally driven chillers. They evaporate liquid, such as water, at low pressure colsec and escape the heat around here. So, rooms can be cool energy efficient. Researchers at the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg working on novel sorbent materials that can store extra water vapor. The researchers are focusing on metal-organic frameworks (engl. Metal Organic Frameworks; short MOF). "The highly porous material can be more than 1.4 times its own weight to absorb water," Dr. Stefan Henniger by Fraunhofer ISE describes a particular characteristic of the material. The metal-organic framework compounds are also suitable for use in thermally driven heat pumps. Here, both the thermal energy produced in the addition in the inner cavities of the material colsec is utilized, and the condensation heat that is produced, when the embedded water molecules dissolved and re-liquefied. This allows a more energy-efficient and cost-effective heating. Thus, the MOF can develop their potential properly, not only the water vapor has to pass easily into the porous interior, but also heat can be removed well. The experts at the Fraunhofer ISE have developed a new coating process and applied for a patent. Thus, the new sorbent materials can be fixed, for example, colsec to heat exchangers, without impeding the mass and heat transport. The research is funded by the Federal Ministry of Economics and Technology. Canned heat in industrial plants, colsec power stations and biogas plants - in many processes falls to heat almost as a "waste product". So far, this thermal energy is hardly colsec used. The want to change in Stuttgart scientists at the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB. The researchers develop and optimize heat storage based on zeolite. Zeolites are crystalline mineral having a porous framework structure, on the surface colsec to other substances, for example water deposited. The material reaches an inner surface of up to 1000 square meters per gram. Does it come with water vapor in contact, it binds it into the pores and heat is generated. For heat storage drying the material. The thermal energy is released again when again attaches steam. Experts at the Fraunhofer IGB make this kind of heat storage now technically colsec available. Thermochemical storage systems on zeolite-water base can accumulate colsec up to 180 kilowatt hours of energy per cubic meter of material depending on the charge temperature and application. For comparison, the energy density of conventional hot water storage colsec is usually less than 60 kilowatt hours per cubic meter storage. However, zeolite sorption storage are still quite expensive. "From an economic and technical point of view, we see the application field currently in the industrial sector," says Mike Durchblicker, which the group conducts colsec heat and sorption systems at the Fraunhofer IGB.
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Source: Fraunhofer-Gesellschaft: Fraunhofer-Gesellschaft - Press Release Online in the Web; URL http://www.fraunhofer.de/de/presse/presseinformationen/2014/Maerz/waerme-speichern.html [Date: 21.05.2014, 17:14 Time]]