CULTIVATIONTIPS DELPHY Innovative growing rooms Single-layer system.
The era of standard growing rooms with two sets of shelves and fi ve layers of beds is long behind us. Farms built today for manual picking vary in size from two to eight shelves, and from a single layer, or tier, of beds up to seven. The most critical aspect for air distribution and movement is how many layers of beds the room holds. In mushroom growing, the air movement is always indirect as the speed of the air expelled by the air outlets or air liners is much too high to be blown over the beds directly. However, a high air expulsion speed is necessary to take air to the lower parts of the room and to create suffi cient indirect air movement.
With a single layer system, the relationship between the volume of the growing room and the growing surface area is obviously much greater than in multi-layer systems. If there is too much empty volume, the air movement will not be eff ective, and there is a risk that not enough air movement will be felt over the beds. So in a single-layer system you must prevent air accumulating at the top of the room and ensure it is directed downwards – without, however, blowing it directly onto the beds. Despite the limited experience with this system, progress has been made in the past few years which has led to considerable improvements.
Seven-layer system.
The newest growing rooms for manual picking often have four rows of shelves, each of which are fi ve to seven beds high. The more limited the space in the room, for example when there are seven layers of beds, the more eff ective the air movement is. However, the risk of a direct air fl ow (edges/lower beds) is higher. The biggest problems here are mainly in the central aisle where one air duct supplies the air for two shelves. The air is expelled at a very high speed which can cause irregular and direct air movement. Many advances have taken place in this system in recent years, resulting in adequate solutions.
Innovation in growing rooms often has direct consequences for air movement and distribution which stretches the boundaries so that new solutions have to be developed. The challenge is to prevent, or minimise, any negative impact on cultivation.
Jan Gielen
Climate & Energy Specialist Delphy Mushrooms
j.gielen@
delphy.nl
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