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Story of the double poly greenhouse
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The 43rd ASAE Landmark Dedication
to the Air-inflated Double Poly Greenhouse
2004/6/5
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History started
• Developed In 1964
• Roberts, W.J. and D.R. Mears. 1968. Double Covering a Film Greenhouse Using Air to Separate Film Layers. ASAE paper 68-402. Presented at Logan, Utah.
• Published in Transactions of the ASAE V12,
No.1 pp.32, 33, 38. 1969.
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Professors William J. Roberts and David R. Mears
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Advantages of Air-Inflated Double Poly
• Low costs
• Easy installation
• Great energy conservation
• Sturdy structure
• Proper light transmission
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Current Status
• More than 65% of plastic greenhouse in US is air-inflated double Poly
• More than half of the plastic greenhouse in the world is air-inflated double Poly
• Getting more attention in tropical and subtropical regions in some greenhouse for specific applications
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First Prototype
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Trox House
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The 43rd Landmark of ASAE
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First installed in a commercial greenhouse (Kube Pak, Inc.)
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Later development
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Air-inflated Cable House
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Air-inflated side curtain for a sawtooth greenhouse
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Triple layer
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Air-inflated Open top greenhouse
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Air-inflated Double Poly in Japan
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Prof. Roberts prepares the display of thermal curtain model
First double-poly in 1978
Typhoon attacked greenhouses, but no damage on double-poly
2nd generation
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Covered with Agron 2nd generation in Tsukuba
AgraTech introduced in TohokuOkada, M. and Hayashi, I., 1983: Trial construction of an air-inflated greenhouse and its features, Agric. and Hortic., 58(1), 57-60. (in Japanese)
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Current Double-PO GreenhouseCurrent Double-PO Greenhouse
Courtesty Mr. Matsuoka, Kochi Agric Exp Station
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Development of a New Air-inflated Greenhouse DesignDevelopment of a New Air-inflated Greenhouse Design
Project leader: Dr. Shimaji, National Institute of Floricultural Sciences, Tsukuba
• Three-layer covering (fluorine film, F-Clean) for insulation• Collection of solar energy on the roof and storing heated water
under the floor• Large roof ventilators for natural ventilation• Beam string structure
Prototype greenhouse
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Collecting Solar Energy into WaterCollecting Solar Energy into Water
• To keep the night temperature diffrence between inside and outside at 18 C, additional heating energy was reduced up to 20%.
P
P P
Sunlight
Water
Ventilation
Heat transfer
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Prototype Greenhouse of New designPrototype Greenhouse of New design
Beam string structure
4 m
3 m
3 m
2.3 m
Panel for roof ventilator
Water tub
Air-inflated roof panel with fluorine film
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Air-inflated Double Poly in India
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1986 India
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Air-inflated Double Poly in Taiwan
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1989 National Taiwan Univ.
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1990 Taichung, Taiwan
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No damage on air-inflated double Poly after one major Typhoon
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Phalaenopsis flower forcing required Day/Night Temperature at 25/18 oC
Air conditioner is used in Taiwan
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Air-inflated double poly has been used in Flower forcing greenhouse
18oC
Tdb,oC 25 30 35
RH, % 65 49 36
18oC
Tdb,oC 25 30 35
RH, % 84 62 47
22o C, 78%
Reduce condensed water and conserved energy
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To prevent flower stake emerge, day/night temperature need to keep no less than 28 oC
• Outdoor T < 28 oC: 72 ~ 84% in plain area of Taiwan
• Air-Inflated Double Poly can be very helpful in energy conservation– as the thermal blanket of an existing
greenhouse (glass or poly).– as the glazing.
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Air-Inflated double Poly can be used in Phalaenopsis greenhouse to conserve energy for the prevention of
flower stalk emerging
Warm
Cold blower
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Air-inflated Double Poly in China
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1989 China
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Air-inflated Double Poly inAustralia
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Greenhouse Manufacturersworldwide
• All Greenhouse manufacturers in US
• At least one Greenhouse manufacturer in France
• At least one Greenhouse manufacturer in Japan
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Richel Corp., France
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Japan
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Landmark Dedication
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50 years ago
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2004/6/5
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