Mechanization of ventilation in high tunnels, 2015
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MECHANIZATION OF VENTILATION IN HIGH TUNNELS Steve Bogash Horticulture Educator / Researcher
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Transcript of Mechanization of ventilation in high tunnels, 2015
MECHANIZATION OF VENTILATION IN HIGH TUNNELS
Steve Bogash
Horticulture Educator / Researcher
High tunnels are designed to be low tech, low input, structures why complicate them?
Mechanizing your tunnel:• Temperatures within tunnels change rapidly.
– Without some automatic temperature control you must constantly adjust roll up sides, roof and gable vents.
– Adjusting to temperature shifts is most important at the season fringes when tunnels are most critical.
– One of the most significant disease controls is keeping humidity under control.
– Flower abortion occurs when air temps get over 92-95F.
– Fruit quality can be enhanced with greater temperature and humidity control.
Types of enhanced ventilation• Motorizing roll-up sides
• Powered fans and louvers
• Gable end vents
– Thermostat controlled
– Manually adjusted
• End wall / door innovations
Coal furnace
Air pollution damage from coal
Temporary end wall during construction
Large removable door panels
Sliding doors vs. hinged
IR and diffusion plastics
Removing entire end
Mid-greenhouse vent PSU Tunnel Town
12 volt solar powered gable end fans
Is vertical redistribution next?
Interesting home built
THANK YOUPLEASE SEND ME YOUR MECHANIZATION IDEAS!
Steve Bogash
Horticulture Educator / Researcher
