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Mechanization of ventilation in high tunnels, 2015

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by Steve Bogash, Horticulture Extension Educator/Researcher | Penn State University

Presented at the 2015 Minnesota Statewide High Tunnel Conference.

Published in: Education
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Mechanization of ventilation in high tunnels, 2015

  1. 1. MECHANIZATION OF VENTILATION IN HIGH TUNNELS Steve Bogash Horticulture Educator / Researcher
  2. 2. High tunnels are designed to be low tech, low input, structures why complicate them?
  3. 3. 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.
  4. 4. Types of enhanced ventilation • Motorizing roll-up sides • Powered fans and louvers • Gable end vents – Thermostat controlled – Manually adjusted • End wall / door innovations
  5. 5. Coal furnace
  6. 6. Air pollution damage from coal
  7. 7. Temporary end wall during construction
  8. 8. Large removable door panels
  9. 9. Sliding doors vs. hinged
  10. 10. IR and diffusion plastics
  11. 11. Removing entire end
  12. 12. Mid-greenhouse vent PSU Tunnel Town
  13. 13. 12 volt solar powered gable end fans
  14. 14. Is vertical redistribution next?
  15. 15. Interesting home built
  16. 16. THANK YOU PLEASE SEND ME YOUR MECHANIZATION IDEAS! Steve Bogash Horticulture Educator / Researcher

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