Cooling & ventilation

Greenhouse cooling or ventilation can be reached in mild climates with automatic roof vents or gable vents. These systems can also be used in warmer climates during spring and autumn. In this case the a mechanical cooling system can be switched off to save energy.

For hot climates, mechanical cooling will be necessary. The most common ventilation method in many of these areas, is still a fan and pad mechanical system.  This system will exhaust the hot greenhouse air through inlets and provide a cooler environment by pulling air through a wet wall. The advantage of the pad and fan evaporative cooling system is that it finds it use all over the world. But the system also holds many disadvantages. Most important disadvantages are limited length of the greenhouse, very high water consumption, a too high temperature gradient between inlet and outlet of the greenhouse (can be 5°C or 7°F over a length of only 40 m) and less growth on first plants near air inlet.

To overcome many of the pad and fan disadvantages and to be able to design large and efficient greenhouses with cooling, our specialists have designed and engineered the biggest fully enclosed greenhouse in the world. This fully enclosed greenhouse cooling concept has been redesigned to suit greenhouses in desert type climates or other hot climates, against much friendlier investment costs (CapEx).

These new cooling concepts make it possible to design greenhouse lengths over 200 m, to design big commercial greenhouse blocks of 8 hectares (20 acres) and more.

For research greenhouses with special requirements like equal temperature and tight covers due to hygiene protocols, our specialists have designed a cooling system with chillers that accommodate different temperatures for each greenhouse chamber (in case of a multiple zone greenhouse) and still can be energy efficient (positive for running costs; OpEx).