The new system is currently in use in two growing rooms. The fi nal two rooms are not yet in production, but will be used as soon as the market demands.
generate 520,000 KwH of power. It’s a benefit for every farm to make their own energy like this. In summer, when the majority of the energy is generated, you always need a lot of power for cooling.”
GTL
A fifth pillar was recently added to the sus- tainability programme at Wauwiler, and was achieved jointly with Dutch company GTL. “We wanted to build some more growing rooms, and had contacted GTL to discuss other ways of potentially saving energy – something devoted high priority here. GTL came up with the idea of crossing the air exiting from the growing rooms with the incoming air using a network of smaller ducts. They had applied the same principle on a number of recent projects, and actually if you really think about it, it’s a logical concept. You basically throw away a lot of air, extracted at the right temperature, from each growing room, and bring in fresh, outside air that is often much too warm or too cold. It’s freezing here now in Wauwil, but thanks to the new system I can introduce air that is now plus 10 degrees Celsius instead of minus five. It’s amazing, I can’t understand why we didn’t do it sooner. We are now using the system for two rooms, but I am convinced the same principle will be applied in
the future in more rooms. There is also a bypass to the system that is used if nothing is changed to the incoming air, for instance on mild days. But for countries where it can be very hot in summer, and extremely cold in winter, it’s an excellent development”, says Vonarburg.
Energy saving is devoted top priority by the Swiss. MUSHROOM BUSINESS 29
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