This experiment in the solar furnace demonstrates the energy contained in sunlight
In just 60 seconds, concentrated sunlight burns a hole in a one-centimetre-thick steel plate. The tem-perature rises to 1200 degrees Celsius and the energy density at the burning hole is five megawatts per square metre. The high-flux density solar furnace and solar simulator of the DLR Institute of Solar Research and the department of Solar Chemical Engineering in Cologne produce highly concentrated solar and artificial light for the research and testing of new technologies and materials.