03-Nov-2009 - Laser Zentrum Hannover e.V. (LZH)

Laser Technology Improves Solar Collectors

The sun is the energy source not only done for photovoltaic cells but also for thermal solar collectors. Whereas photovoltaic cells transform the sun's energy directly into electricity, solar collectors use a liquid which is heated by solar radiation. The thermal energy won during this process can be used for heating water in homes or in larger units for driving power generators.

In the heart of larger units are glass tubes filled with a liquid, which is heated by solar radiation. These glass tubes must be joined together, and according to the Laser Zentrum Hannover e.V. (LZH), laser technology is best suitable for this process. A new project between the LZH and several industrial partners aims at proving that laser joining of glass tubes has many advantages over the conventional flame method, and that it is more cost-efficient for the glass industry.

The disadvantages of the conventional flame technique can partly be compensated by trained staff, but it can also lead to product failure. During the joining process, impurities may occur in the joining zone, which cause considerable variations in the glass quality. Also, the heat input is difficult to regulate when using the flame technique. This is not the case with laser technology.

The advantages of laser joining of glass tubes are mainly temperature control, temperature distribution and in the automation. Additionally, in contrast to the flame joining, the laser joining technique prevents condensation and deposition in the glass tube, thus offering better quality. In combination with chemical resistant and robust borosilicate glass, breakage is significantly reduced, which in turn leads to a considerably lower reject rate.

The project "Lafuelsol" is funded by the German Federal Ministry of Education and Research (BMBF). The project organization is carried out by the Karlsruhe Institute of Technology, division Production and Manufacturing Technologies.

Facts, background information, dossiers
  • glass
  • Laser
  • temperature
  • education
More about Laser Zentrum Hannover
  • News

    Detecting food fraud - thanks to light quanta

    When shopping in the supermarket, consumers must be able to rely on the food label. But is it always correct? In the joint project QSPEC, AMO GmbH, Laser Zentrum Hannover e.V. (LZH), AG Photonische Quantentechnologien of Leibniz Universität Hannover (LUH), TOPTICA Photonics AG, AMOtronics U ... more

    European Research Alliance for the Simplified Production of Organic Solar Cells

    A new laser system is being developed to increase the effectivity of organic solar cells. A consortium under the leadership of the Laser Zentrum Hannover e.V. (LZH) is working on a tunable infrared laser system for the selective processing of organic layers in opto-electronical components. ... more

    LZH Spin-off "Particular GmbH" Starts Up

    The Particular GmbH is a new spin-off firm from the Laser Zentrum Hannover e.V. (LZH), which was started by two LZH scientists. Particular uses a new laser process for the production of highly sterile nanoparticles made of almost any material. There is a high demand for nanoparticles for re ... more

  • Companies

    Laser Zentrum Hannover e.V. (LZH)

    The Laser Zentrum Hannover (LZH) carries out customer-oriented research, development and consulting in all areas of laser technology. Some of the main activities of the LZH are, nanotechnology, i.e. the generation of highly pure nanoparticles or nanostructuring, optical thin-film technolog ... more