A-Frame X-Frame Rafter Flat Roof - Cravo

A-Frame X-Frame Rafter Flat Roof - Cravo

Models & Options R o o f H o u s e s Rafter r e t r a c t a b l e Flat Roof X-Frame A-Frame C r a v o 6 Steps to Create the Optimal Retractable...

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Models & Options R o o f

H o u s e s

Rafter

r e t r a c t a b l e

Flat Roof

X-Frame A-Frame

C r a v o

6 Steps to Create the Optimal Retractable Roof Production System based on your Climate and Crop Step 1: Choose the house model which best addresses your climate and crop needs Step 2: Choose the colour of the roof covering Step 3: Decide if a rain canopy should be added to allow for ventilation through the roof when it is raining Step 4: Decide if additional climate control is required Step 5: Decide on the design of the perimeter walls Step 6: Automate the control of the retractable roof and walls

Cravo Models & Options • Page 3

Step 1. Choose the house model which best addresses your climate and crop needs Climate and Crop Requirements Uncoated Flat Roof Coated Flat Roof X-Frame Rafter

A-Frame

Loading capabilities Wind speed house must resist when roof and walls are closed: kph (mph) 0 - 110 ( 0 - 70 ) 140 -177 ( 87-110 ) 0 - 200 ( 0 -125 ) Snow and hail load when roof is closed: kg/m² ( lb/ft2 ) 0 - 25 ( 0 - 5 ) 25 - 50 ( 5 - 10 ) 0 - 240 ( 0 - 50 ) Crop load Must support the load of a crop like tomatoes or hanging flower baskets Crop requirements Plants must be kept 99% dry Suitable for young plant production Approximately 75% of crop area must be kept dry Plants must be protected from the impact of a hard rain Plants must be protected from cold and heat Plants must be protected from insects when roof is retracted Ground Conditions Structure must be able to follow gently rolling grades







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* Protected by US Patent # 9,163.401. Other Patents Pending.

Cross

se c t io n

of

Flat Roof Page 2 • Cravo Models & Options

h ou se

m o d e l s

( P RO D U C T

C O M P ARISONS )

X-Frame

H o u s e

s p e c i f i c a t i o n s

Uncoated Flat Roof Coated Flat Roof House width

9.1m ( 30ft ) 9.6m ( 31.5ft )

9.1m ( 30ft ) 9.6m ( 31.5ft )

Standard gutter height

Roof height

X-Frame

Rafter

9.6m ( 31.5ft ) 14.6m ( 48ft )

A-Frame 9.1m ( 30ft ) 9.6m ( 31.5ft ) 11m ( 36ft ) 12.8m ( 42ft ) 14.6m ( 48ft )

4.3m ( 14ft )

4.3m ( 14ft )

4.3m ( 14ft ) 4.88 ( 16ft ) 5.5 ( 18ft )

3.7m ( 12ft )

3.7m ( 12ft )

3.7m ( 12ft )

5m ( 16ft ) 6m ( 19.7ft )

5m ( 16ft ) 6m ( 19.7ft )

4m ( 13ft )

4m ( 13ft )

All 4 perimeter walls

All 4 perimeter walls

Roof closing time in minutes (approximate)

6

6

2.5

2.5

2.5

M² ( ft2) of roof powered by one motor

9,300 (100,000)

9,300 (100,000)

3,500 (37,660)

4,400 (47,000)

4,400 (47,000)







Post spacing along the post line Exterior cable bracing

All 4 perimeter None or walls on gables only

Rain canopy can be added to allow ventilation during rain

None

Secondary curtain layer can be added for insect control or additional temperature control











Investment ( 1 = lowest , 5 = highest )

1

2

3

4

5

Cross

se c t io n

of

h ou se

Rafter

m o d e l s

( P RO D U C T

C O M P ARISONS )

A-Frame Cravo Models & Options • Page 3

Models Flat Roof

Arrow indicates Roof closing direction

X-Frame

Page 42 • Cravo Models & Options

Rafter

A-Frame

Cravo Models & Options • Page 35

Roof Coverings Step 2: Choose the colour of the roof covering

The retractable reinforced polyethylene roof coverings are available in clear and white. The best colour for your project depends on whether you are growing in a cold or hot climate.

Clear: best when daytime temperatures in the winter are

White: best when daytime temperatures in the winter

too cold to retract the roof (typically at latitude 30 -50 )

are optimal and when summer temperatures are extreme (year round at latitude 0o-30o and summer production at latitude 30o-40o)

Flat roof with clear roof covering

Flat roof with white roof covering

Peaked roof with clear roof covering

Peaked roof with white covering

o

o

30 N

o

30 S Page 2 6• Cravo Models & Options PAGE • CRAVO MODELS & OPTIONS

o

Rain Canopy CANOPY AVAILABLE

Uncoated Flat Roof NO

Coated Flat Roof no

X-Frame YES

Rafter YES

A-Frame YES

Step 3: Decide if a rain canopy should be added to allow for ventilation through the roof when it is raining If you would like to be able to ventilate during rain for humidity control, then it is recommended to install a rain canopy in the following conditions:

Picture of rain canopy on X-Frame

• If the house is smaller than 1 hectare ( 2 acres ) and none of the perimeter walls are covered with roll up curtains • If the house is larger than 1.5 ha ( 3 acres ) and rainfall can occur for long periods of time

Picture of rain canopy on Rafter

Cravo Models & Options • Page 73

Step 4:

Choose whether to add one or more of the following: • A misting system • A stationary or retractable insect net • An interior retractable cooling, shading and heat retention curtain system

Decide if additional climate control is required If production occurs where temperatures o o are +30 C ( 86 F ) and humidity levels will be below 55%

20°C (68°F)

Add a misting system if you are growing high light crops like berries and tomatoes

T E C N O C O O L I N G E V A P O R AT I V E C O O L I N G P E R F O R M A N C E

18°C (64°F)

Stationary insect net can be installed below the retractable roof

113°F 45°C 104°F 40°C

16°C (61°F)

TEMPERATURE REDUCTION

Add insect net underneath the retractable roof if you are growing sensitive crops like capsicum and cucumbers

95°F 35°C

14°C (57°F)

86°F 30°C 77°F 25°C

12°C (54°F)

68°F 20°C 10°C (50°F)

59°F 15°C Temperature (dry-bulb)

8°C (46°F)

6°C (43°F)

4°C (39°F)

2°C (37°F)

0°C (32°F)

10

20

30

40

50

60

70

R H % R E L AT I V E H U M I D I T Y

80

90

100

For crops where insect protection is not required during the winter, the net can be retractable to increase light and heat

If growing crops between latitudes 30o-50o where winters are cold and summers are hot

If growing crops between latitudes 40o-50o where winter temperatures are cold and summers are moderate

Use a clear retractable roof covering and a white retractable curtain for maximum summer cooling and winter heat retention

Use a clear retractable roof covering and a clear internal retractable curtain for additional winter heat retention and summer cooling

Page 82 • Cravo Models & Options

Internal curtain orientation The optimal orientation of the interior curtain system depends on the direction of the gutters

If the gutters are at least 15 degrees off North/South, the interior curtains should travel from truss to truss in the opposite direction from roof

If the gutters are oriented perfectly North/South, the interior curtains should travel across the house from gutter to gutter

Cravo Models & Options • Page 93

Perimeter Walls Step 5: Decide on the design of the perimeter walls The optimal design of the perimeter walls will depend on if: • Winter temperatures are too cold • Humidity levels are high or low during the summer • Crops need to be protected from insects • Crops will benefit from exposure to wind • Wind will be beneficial to dry soil out after a rain • The region is susceptible to hurricanes or cyclones • It is desirable to prevent rodents from entering the production area

If production is located where winter temperatures are warm and humidity is high: cover walls with stationary insect net

If production is located where winter nighttime temperatures are too cold and summers are hot and dry: cover walls with stationary plastic

Page 10 PAGE 2 • Cravo CRAVO Models MODELS & Options OPTIONS

If crops would benefit from wind, if wind would help dry out the soil after a rain or if the house could be hit by a hurricane or cyclone, cover the perimeter walls with motorized roll up curtains

If crops need to be protected from insects when the roll-up curtains are open, then install insect net over the roll-up curtain openings

If ground is uneven or if rodents should be prevented from entering through the walls, then install a knee wall below the roll up curtain

Roll up curtains are powered by gear motors which slide on a guide shaft and are balanced using a counterweight. Cravo MODELS Models && OPTIONS Options •• PAGE Page113 CRAVO

Automation

Step 6: Automate the control of the retractable roof and walls

Over the last 10 years, Cravo has developed special sensors and computer control algorithms to ensure that you can take full advantage of the benefits of both the natural outdoor conditions and a protective greenhouse and shadehouse environment. The control system includes: • A weather station that measures surface temperature, wind speed, wind direction, rain and barometric pressure • Indoor sensors that measure air temperature, humidity, soil wetness and soil temperature • An interface to connect to a desktop PC for ease of programming, long term data storage, and remote access using a smart phone

Cravo Equipment Ltd. 30 White Swan Road Brantford, Ontario, Canada N3T 5L4 T. +1 519 759 8226 F. +1 519 752 0082

Page 2 • Cravo Models & Options

Pa g e 1 2 • C r avo M o d e l s & O p t i o n s

[email protected] www.cravo.com •

P r i n t e d i n C a n a da • M ay 2 0 1 6