Always constant temperatures in new storehouse CULTIVATION AND TECHNOLOGY What also counts where insulation is concerned is the position of the ventilation ducts. For the outside units, they’ve been placed on the crosscut edge. by placing the doors on the side of the overhanging roof, which is positioned between the storage and the machinery shed. Consequently, the doors are always in the shade. Another advantage is that you’re no longer bothered by hot or cold air flows when the doors are open. And such roofing is also pleasant when moving potatoes in or out of the storehouse. You’re never bothered by the rain and you’re less vulnerable to nature’s whims. Position of the ventilation ducts also important The walls of the storehouse are constructed of thick, concrete prefab elements filled with insulation material. Moreover, the roof construction overhangs the walls thus creating a very high insulation value. What also counts where insulation is concerned is the position of the ventilation ducts’, tells Van der Maas. For the outside units, they’ve been placed on the crosscut edge, he shows us on the drawing. This makes for a good distance between the outside wall and the stored product, which is also behind a concrete inside wall. It also implies that the ventilation ducts of these outside units are widthways, ‘What can’t be seen from the outside are the ridge ventilation flaps, which enable air ventilation from the storage units. When they’re open, they provide extra natural draught. thereby creating cross ventilation. The advantage, according to Van der Maas, is that you don’t have to partly-close the ventilation ducts when you are only removing a part of the potatoes, but you can close the ducts completely where potatoes have been removed. In addition, you need no longer use the corresponding ventilators and that saves more energy than when you operate the ventilators at half power. Only the central unit has a ventilation duct at the back and subsequently lengthways ventilation under the grids. As if the constructional solutions are not enough, Van der Maas has also taken account of the division within the unit. The lot that needs to be stored the longest is always placed on the shadow side of the store. No gas, no sprouts, optimal frying quality What the ultimate effect of all the insulation and the choice of units is on the potatoes is quite clear when we take a look in the unit with potatoes that are stored the longest. Van der Maas shows us the Markies variety, which have only been treated once with a high dosage of the sprout inhibitor GroThe doors are always in the shade. The fact that the roof extends over the side walls provides extra insulation against sunshine on the walls. 26 Potato World 2013 • number 3 Pagina 25
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