Referenz der Ritter XL Solar GmbH

Heiner Schürch

Solarthermie für eine Lackierstraße

Project manager at Zehnder

"We want to be the most attractive
Provider of energy efficient solutions
for healthy and comfortable room .
conditions. Not only for our products
and system solutions, but also for our
own building and production plants."



  • Location: Gränichen, Aargau, Switzerland
  • Solar heating of the basins of the paint shop
  • Collector surface: 394 m²
  • Commisioning: July, 2012


This solar process heat system is the first project which Ritter XL Solar has realised together with the world leader for industrial paint shops EISENMANN within their "Green Alliance for a Sustainable Production". The aim of the partnership is to promote the use of solar-thermal systems in industrial processes, especially with paint shops and coating plants, worldwide.

On the roof of the new logistics hall of the company Zehnder 80 vacuum tube collectors of the type CPC 45 form a collector field of nearly 400 m². The field is divided in 16 modules, each with 5 collectors switched in line. These modules were prefabricated at EISENMANN and transported with heavy load trucks to Switzerland. So the collector system could take place on site in only one day.

The solar system is hydraulic integrated in the heating centre of Zehnder simply like another boiler. It serves primarily the heating of the paint shop. To feed the complete solar heat into the processes, the basins must be overheated if necessary, e.g., on week-ends, over their nominal temperature by 60°C. The overheating can be raised on a maximum value of approx. 75 °C.

The guaranteed solar yield per year is 400 kWh / m² gross collector area, at a solar temperature of 90 °C, or 157.6 MWh per year for the complete system with 394 m². With a realistically assumed annual efficiency of the boiler plant of about 80 percent, this fulfils fuel savings of approx. 200 MWh per year. This corresponds to a reduction of 16,800 kg of propane, converted about 20,000 litres of fuel oil or 58,800 kilogrammes of wooden shred. The solar system will pay off in five years, subsidies of the Swiss Federal Office for Energy are helping thereby. An extension of the solar capacities is already now planned.