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Wind Direction Speed and External Temperature

» The second parameter to be taken under control in the greenhouse is the relative humidity.The change of relative humidity between 60-90% in greenhouses generally does not have a great effect on plants. However, it can cause water stress on the fresh leaves of young plants, especially at the time of ventilation, at temperatures below 60%.Effective and correct ventilation in the greenhouse depends on the structure of the greenhouse ventilation system and the control method.The logic of the ventilation system is as follows.The outside cool air that enters with the help of the roof and side walls is replaced by the hot air inside.Meanwhile, the water vapor formed as a result of transpiration is expelled and the humidity inside the greenhouse is limited.Air exchange is achieved due to the difference between the internal and external temperatures and the pressure difference created by the wind direction through the ventilation windows in the greenhouse.However, this change is directly related to the ventilation area and type.The formation of the chimney effect in order to provide adequate ventilation in the greenhouses is equal to the square root of the ventilation height multiplied by the internal and external temperature difference.[(Ti –Td) h] 0.5 Wind creates an average fluctuation due to turbulence on the greenhouse. All ventilation in the greenhouse is produced by the combination of chimney effect and wind effect.It was found to be effective at the point where the Wind Speed is more than 0.3 or 1.As a result, the wind speed must be more than 1-2 ms-1 for wind ventilation to occur.An approach has been developed by Bot (1983) where wind and temperature effects and flow characteristics of ventilation openings are discussed in detail.This approach; It was also applied in a study by De Jong (1990).As a result of these studies; it is determined that the effective ventilation current is linear proportional to the wind speed at a certain height (normally 10m) and the area of the ventilation windows in the external environment.As a result of ventilation flow measurements, these relationships have been verified and validated for different conditions and window types.



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