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Introduction
Similar to fogging systems, pad and fan systems operate by evaporative cooling: the cooling happens as the heat in the greenhouse air is used to evaporate water to water vapour. These systems consist of fans on one wall, and cooling pads with water circulation on the opposite wall. The fans pull in air from outside the greenhouse, which runs through cooling pads: as the water on the cooling pads evaporates using the energy from the air, the air becomes cooler and humid as it blows over the greenhouse crops and is expelled via the fans on the opposite wall.
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