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Mushroom Business is a Global Roel Media publication. Mushroom Business will be published six times a year.
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Editor John Peeters
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OUT AND ABOUT A cool garden
During our recent visit to Sjaak Willems, owner of mushroom farm Wilke Champignons in Kes- sel, the Netherlands, we discovered a remarka- ble piece of innovation.
The farm has nine growing rooms of 535m2 surface area. When these were being constructed, Sjaak came up against the pro- blem of how to cool the condensers used to chill the freon nee- ded to cool the climate installations in the growing rooms. Many companies use noisy fans or a water cooling tower. So, with the peace and quiet of his neighbours in mind, Willems embarked on a quest for an alternative solution. With the aid of a company specialised in cooling, the answer was found in a water coo- ling system. However, the volume of water required to cool the freon is some 15m3 per hour for 600 kw of cooling capacity. This would mean a huge waste of energy if this water had to be discharged. Additionally, there would be environmental issues to cope with due to the resultant thermal pollution. First of all, the climate installation was equipped with extra large, low heating value heater blocks so that the heated water of 37 degrees Celsius could be used for dehumidification during summer. This slightly cools the water that is first used to either heat or dehumidify the growing rooms before it enters an underground system of pipes, consisting of 4000 metres of pipes spread over an area of approximately 1000 square metres. These pipes are covered by a 4 to 5 cm layer of gravel. Twenty two sprinklers connected simply to the system keep the entire area damp. The secret is the fact that the ground holding the pipes is cooled by some of the water of 35 degrees heated up by the cooling unit. Evaporation needs heat. By constantly spraying the warm water over the gravel layer, evaporation of this warmth ensu- res that the temperature of the water in the pipes drops from 35 to 24 degrees during the four kilometre journey so that the water is suitable to cool the cooling unit again. For the system to operate properly, it is essential to have virtually iron-free water. The system offers many advantages as it is silent, and the heat is reused for an energy saving system that complies with all environmental requirements. Plus, the investment is considera- bly lower than for other systems. And: you can create a fabulous garden on top!
By Thei Staaks Mushroom Advice Network
info@mushroomadvicenetwork.nl
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