The moisture content of humid air is removed by condensing it to liquid water by exposing it to a cold surface with a temperature lower than the dew point of the greenhouse air. The active dehumidification in the tool creates the cold surface by using a heat pump.
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The heat recovered can be used to immediately heat the dehumidified air, or stored, for instance in an aquifer or other forms of heat storage.
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The dehumidification capacity of the cold surface depends on:
the cold water temperature,
water flow over the heat exchanger
airflow of the greenhouse air over the cold surface
humidity levels inside the greenhouse.
The dehumidification capacity decreases rapidly at greenhouse air temperatures below 15°C and at low greenhouse humidity levels. Dehumidification capacity can be increased by increasing the heat exchange surface area per m2 m2 of the greenhouse, though it could be an expensive measure.
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