v.greenhouse structures a.introduction b.selection - factors 1. strength & design
TRANSCRIPT
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V. GREENHOUSE STRUCTURES
A. Introduction
B. Selection - factors
1. strength & design
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2. light transmission
a. intensity• inside greenhouse
b. factors determining
intensity
3. working conditions
4. initial cost
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5. maintenance costs
6. flexibility and adaptability
7. insurance and taxes
8. environmental control
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D. Structure components
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C. Peaked roof design
a. roof slope
•26-28° on glass x fiberglass structures
–(6" vertical : 12" horizontal)
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Light passing through glass at different sun angles
Date 260 slope
Angle of sun
Dec 21 37
Nov&Jan 33
Sep&Mar 24
Aug&Apr 1
Jul&May 7
June 21 10
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Ridge height of houseGreenhouse width
(ft)260 slope
ft-in
18 11’ 9”
21 12’ 5”
25 13’ 5”
28 14’ 2”
32 15’ 2”
35 15’ 10”
42 17’ 6”
49 19’ 4”
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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
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Designed by Dr. John walker, Agriculture Engineer. University of Kentucky
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E. Structural materials1. Wood
– types
•Cypress, black locust, red ceder
• redwood, osage orange
–characteristics
• high maintenance
• light weight
• available
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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
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3. Steel• treatment–Galvanized–Painted
• characteristics–Longevity–Heavy
–Rust
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4. Aluminum
• characteristics–little corrosion, low maintenance–light weight–strong–light reflectance–attractive–high cost
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Ridge height of houseGreenhouse width
(ft)260 ft-in 630 ft-in
18 11-9 25-0
21 12-5 27-11
25 13-5 31-10
28 14-2 34-10
32 15-2 38-9
35 15-10 41-9
42 17-6 48-6
49 19-4 55-5
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