Preventing climate shocks in the greenhouse

It is very important for plant growth that the moisture balance does not get interrupted unnecessarily. Circuits of exposure or the closing of screens can cause moisture shock and temperature drop when they exchange unnecessarily. To prevent this from happening, a ‘point of no return’ can be set by letting the controls look at it's own ‘status’ in certain periods.

Example of energy screen control
Sometimes a curtain closes early at the end of the day, based on low radiation or a temporary low outside temperature. When the outside circumstances change, and the screen opens again, one can prevent this by closing the screen with a minimum time limit.

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Hoogendoorn advises not to increase these values too much, since this can obstruct the opening times of the screen. A second possibility is to determine until what time the screen needs to be closed by altering the right influence and period settings.

By applying the same increase in influence based on the screen position, you can easily realize this per period. The example below shows that if the greenhouse temperature has reached the pre night temperature, the screen closes automatically. Once closed more than 5%, the screen stays closed.

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In the context of the Next Generation Growing, it is advised to close the screens earlier, but not completely in order to prevent radiation.

For more information:
Hoogendoorn Growth Management
T: +31 (0)10 460 80 80
[email protected]
www.hoogendoorn.nl