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Phase Change Material PCM

idea impetus

"GlassX -. An innovation from the Rhine Valley" These were the words of architect struggles to beat a visit to the Marché International Support Office The seminar tour in January 2008 with the HSZ-T. This was

office building on the roadhouse Kemptthal placed on ecology and energy efficiency the highest value. The house is the first accounted for zero-energy office building in Switzerland. On the south side are the GlassX elements, designed by architect Dietrich Schwarz Domat / Ems, on the application. This innovation was completely new to me and inspired me to research further in this direction.

In this blog I set myself in general with a latent heat storage and GlassX closer look at the product.

What is latent heat storage?
A latent heat storage is a device which converts thermal energy hidden (latent from the Latin latere = be hidden), low loss, to save many repeated cycles and over long time in the position.
The use of solid-liquid phase transition, it is the most common principle. When charging commercial phase change usually specific salts or paraffin are melted as a storage medium, the record here a lot of heat energy, the melting heat. Because this process is reversible, the storage medium is exactly this amount of heat during solidification again.
functioning The advantage of this heat storage technology based on the fact it onto a through the melting temperature of the storage material well-defined temperature range, as much heat energy in a minimum mass. This shows in general, however, far lower densities. During the storage of heat in the storage material that when it reaches the temperature of the melting phase transition and then increases, despite a further saving of heat, its temperature is not completely melted until the material. Only then again an increase in temperature occurs (red curve).






research - Objectives and market opportunities of PCM latent heat storage using phase change materials is investigated for several decades of research. In spite of the obvious advantages of this storage method, the industrial implementation still lies largely in its infancy. Aside from cold storage, so there is worldwide only about one to two dozen companies that deal with the production of PCM products. The objective of PCM intermediate should meet the following requirements:

• chemical and physical stability
• cycling stability
• better handling • No external volume change • increases the heat transfer
GlassX - the product
stores a layer of salt crystals, the heat of the radiating sun, releases it as needed to the interior. An additionally implemented prism glass lets the sun's rays pass only at a flat angle of incidence (ie in winter) and otherwise protect the room from overheating. This produces a component that uses the power of the sun, stores, and also protects her.


GlassX system integrates four components in one functional unit: Transparent insulation, thermal protection, energy conversion, thermal Memory. A 3-fold up insulating glass provides excellent insulation with a U-value of less than U = 0.5 W/m2 K. An implemented in the disk space prism glass reflects the high summer sun angles of 40 ° to the outside. However, the winter sun's full intensity of the sun. The central element of GlassX is a heat storage module that receives the solar energy, stores and a delay as pleasant radiant heat emits again. As a storage material is a salt hydrate is used. The heat storage is done by melting the liquid, on cooling, the heat stored in discharged. The salt hydrate is in polycarbonate containers hermetically welded. Room side, the item with a 6 mm toughened safety glass is complete, the design can be treated.
reflection of the learning process
addition to the above-described physical properties I see above all a great potential of creative options for us architects. How often are required in buildings or semi-transparent or transparent materials proposed. Can such a material can be used simultaneously increases the energy used. On the other hand it is exciting to have a building envelope, which varies throughout the day in its expression. follow the fascination of the change of physical state on its own window to my amazement.




be the same time, but also mentioned that at present the additional costs compared to a conventional glass are considerable. According to information from the fighting, these factor of four. But we need always innovative companies and individuals who invest in the future and make such a product suitable for mass production.




Reto Eberhard 22nd May 2008






source lecture Beat fighting Wikipedia
www.glassx.ch







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