Heat from solar energy – Solar thermal
The basic principle behind solar thermal transfer is easy to grasp: unroll a garden hosepipe and lay it out in the sun - after a while the water in the hose will get hot.
Thermal collectors work on the same principle, however much more efficiently and without the potential hygiene problems of the garden hose! A special fluid is heated within a closed circuit to a temperature of up to 220 degrees Celsius and pumped into a heat exchanger. This heat is then „stored“ in a domestic hot water storage cylinder. Some solar thermal systems heat only the domestic hot water, others are used for central heating or even to heat a swimming pool.
Heat can still be generated even when the sun is obscured by cloud.
Even on cloudy days, thermal systems can still work to a large percentage of their capacity through the diffuse light they receive.
Solar thermal systems consist of the following components:
- Collectors (mainly 2 to 6)
- Pipework from roof to cellar/heating room (generally through unused chimneys)
- Solar storage cylinder (replaces existing storage cylinder)
- Solar station (to control solar circuit)
- Solar control unit (for automatic operation of system)
- Expansion vessel (compensates for thermal expansion of solar fluid)
Solar thermal systems are compatible with every type of boiler, whether oil, gas, or wood pellets, even with older devices, and can be installed in a single day