Feolite

Feolite is a type of iron oxide sintered into building blocks, which are then used for heat storage.[1][2]

Feolite was developed in Great Britain.[1]

Characteristics

Feolite, one of many materials used for heat storage, being a solid, does not have any volumetric or pressure containment issues, but correspondingly does require the use of a transfer medium to then get the stored heat to the desired location.[3]

The specific heat of feolite is 920.0 J·kg−1·°C−1,[4] its density is 3,900 kg·m−3, and its thermal conductivity is 2.1 W·m−1·°C−1.[5]

Feolite may be used at temperatures up to 1000 °C.[1]

History

Feolite was invented in 1969 by Electricity Association Technology, then called Electricity Council Research Centre.[6]

Feolite was a registered trademark [7] in Australia for all iron oxides for use in the manufacture of thermal storage units which has now lapsed, by Electricity Association Technology of the United Kingdom.[7]

Heating systems with a storage component now widely use feolite as the storage core.[8]

Application

Blocks of feolite enclosing sheathed electric heating elements to form a heat storage core, surrounded by thermal insulation, are used in storage heaters and storage radiators.[9][10] Because feolite blocks will conduct electricity, electric heating elements must be electrically insulated when used with feolite storage.[11]

The typical heat exchange medium for feolite storage is air.[10][12][13]

Feolite has been considered for use as a component for braking systems in railway rolling stock.[14]

References

  1. 1 2 3 Wettermark, Gunnar. "High Temperature Storage". Springer International Publishing AG. doi:10.1007/978-94-009-2350-8_24. Retrieved 27 June 2016.
  2. ↑ "Night Storage Heaters" (PDF). Bavarian State Office for the Environment. Retrieved 28 June 2016.
  3. ↑ Hausz, W.; Berkowitz, B.J.; Hare, R.C. (October 1978). "CONCEPTUAL DESIGN OF THERMAL ENERGY STORAGE SYSTEMS FOR NEAR TERM ELECTRIC UTILITY APPLICATIONS" (PDF). National Aeronautics and Space Administration. Retrieved 27 June 2016.
  4. ↑ Willmott, John A. (2002). "Dynamics of Regenerative Heat Transfer". Taylor & Francis. Retrieved 27 June 2016.
  5. ↑ L´opez, Juan Pablo Arzamendia (2013). "Materials Design Methodology Architectures for the Latent Storage in the Field of Building" (PDF). INSA de Lyon. Retrieved 28 June 2016.
  6. ↑ "Our History". Electricity Association Technology. Retrieved 28 June 2016.
  7. 1 2 "FEOLITE - 268578". Intellectual Property of Australia. Retrieved 28 June 2016.
  8. ↑ A sample of commercial systems from around the world:
  9. ↑ Frazer, Stephen. "Electrical Heaters". Building Services Engineering. Retrieved 27 June 2016.
  10. 1 2 Wright, Andrew J (1997). "ELECTRIC STORAGE HEATERS IN BUILDING SIMULATION" (PDF). Electricity Association Technology. Retrieved 28 June 2016.
  11. ↑ Hegbom, Thor (1997). "Integrating Electrical Heating Elements in Product Design". Marcel Dekker. Retrieved 27 June 2016.
  12. ↑ "PIONEER OF ELECTRIC HEATING ACCUMULATION - Design and manufacture Belgian since 1961". ACEC HEATING. Retrieved 28 June 2016.
  13. ↑ "The TECHNOTHERM electro storage heater" (PDF). Technotherm International. Retrieved 28 June 2016.
  14. ↑ McGuire, M. (1973). "Some further investigations into the use of feolite as a friction material". SPARK - Rail Safety and Standards Board. Retrieved 28 June 2016.
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