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Entry Date
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Location
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Sunday, May 12, 2024
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Matt D.
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Connecticut
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Entry 30 of 116 |
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Passive Intake Vent on Cold Frame
This show the passive vent that is connected to a thermostat set to open when the inside temperature reaches 86F (30C). At the same time the exhaust fan (seen in the distance) is also turned on allowing for air to be pulled through the structure. The CMH lights are also placed in this direct air flow to keep them cool if needed, but often they are not on during the heat of the day.
The thermostat not only turns on the vent and fan, but at the same time the CO2 controller will go into stand-by mode. This is a great feature as it not only saves the dosing of CO2 when air is being vented out, but it will still monitor current CO2 levels. If air circulation is not sufficient around the plant there will be a reading of less than 400ppm so checking on the CO2 level during the heat of the day is another way to monitor environmental conditions and make adjustments if needed.
A Review of Ventilation and Cooling Technologies in Agricultural Greenhouse Application :
https://www.ijee.net/article_64325_ed4445b59a403b945cb9d541465c6a5f.pdf
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