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V. GREENHOUSE STRUCTURES

V. GREENHOUSE STRUCTURES. A. Introduction B. Selection - factors 1. strength & design. 2. light transmission a. intensity inside greenhouse b. factors determining intensity 3. working conditions 4. initial cost. 5. maintenance costs 6. flexibility and adaptability

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V. GREENHOUSE STRUCTURES

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  1. V. GREENHOUSE STRUCTURES A. Introduction B. Selection - factors 1. strength & design

  2. 2. light transmission a. intensity • inside greenhouse b. factors determining intensity 3. working conditions 4. initial cost

  3. 5. maintenance costs 6. flexibility and adaptability 7. insurance and taxes 8. environmental control

  4. D. Structure components

  5. C. Peaked roof design a. roof slope • 26-28° on glass x fiberglass structures • (6" vertical : 12" horizontal)

  6. Light passing through glass at different sun angles

  7. D. Structural types 1. post rafter • A-frame • post-truss3. 4. rigid-frame 5. quonset 6. gothic 7. ridge and furrow 8. connecting pipe house

  8. Designed by Dr. John walker, Agriculture Engineer. University of Kentucky

  9. E. Structural materials 1. Wood • types • Cypress, black locust, red ceder • redwood, osage orange • characteristics • high maintenance • light weight • available

  10. 2. Treated wood • nontoxic chemicals • Chemonite (NH4CuAsO4) • Greensalts (CrCuAsO4) • Osmose K-33 (CrCuAsO4) • toxic chemicals • Pentachloro phenol • Creosote • treatment method • Pressure not painting • Last 20-30 yrs

  11. 3. Steel • treatment • Galvanized • Painted • characteristics • Longevity • Heavy • Rust

  12. 4. Aluminum • characteristics • little corrosion, low maintenance • light weight • strong • light reflectance • attractive • high cost

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