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The greenhouse can be passively cooled by opening the ventilation windows, or vents, to exchange air between the inside and outside of the greenhouse. (Note: natural ventilation means no use of fans - air is exchanged solely due to the buoyancy of the lighter, warmer air in the greenhouse which rises to the vents, and due to wind flow).
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Contribution to energy balance and resource use of greenhouses:
Energy balance:
Provides a way to discharge excess energy out of the greenhouse by exchanging hot and humid air from inside the greenhouse with the colder, drier air from outside.
Water use:
Along with releasing energy, vents also remove water vapour from the greenhouse, reducing the humidity. This may be undesirable in regions with water scarcity.
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Vents also affect the CO2 balance :
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