Wss Powerpoint Wind And Dust Jan 2012 Show
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Transcript of Wss Powerpoint Wind And Dust Jan 2012 Show
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www.WeatherSolve.comSince 1986
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www.WeatherSolve.com
About WeatherSolve Structures
Windbreak research
Examples of windbreaks
Windbreak components
Extreme wind considerations
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www.WeatherSolve.comAt WeatherSolve we have been researching, developing,
designing, and building wind fences for over 30 years.
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www.WeatherSolve.com
WSS has miles of fences in North and South America, in the
Middle East, Asia and the South Pacific. Over 10km of those
fences are close to 100ft high.
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www.WeatherSolve.com
We know of no other companies with wind fences still standing
that are over 60ft high. In fact no other company worldwide has
even a small fraction of this experience – in length, in height or in
variety of locations.
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www.WeatherSolve.com
Engineering based near Vancouver, Canada. supply arm based in Georgia USA
We fit our input to your needs:-
Design – Aerodynamic and structural design capabilities
Supply – from specialized components only to turnkey supply
Install – from supervision and training only to complete install
Maintain – Inspection service or -
complete maintenance contract
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www.WeatherSolve.com
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www.WeatherSolve.com
Dustbowl Storm (1930’s)
Early wind fence research focused on controlling wind erosion Contractors discussing kiwifruit
shelter erection techniques, NZ
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There have been many studies of wind fence effectiveness.
Effectiveness relates to aerodynamic porosity of the
cladding and height of the fence.
Windspeed reduction is also a function of the distance from
the fence and several other more subtle variables such as
turbulence of the incoming wind.
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www.WeatherSolve.com
Shelter Effect
Illustrated are the mean windspeed
reductions, behind model windbreaks in a
wind tunnel, as a fraction of windspeed without the barriers.
Raine and Stevenson, 1977
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www.WeatherSolve.com
Dust erosion from a pile
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www.WeatherSolve.com
Erosion ∝ (wind speed) 3
Overall dust loss is typically proportional to (windspeed) 2
A good windbreak will reduce wind speeds to under 40% so dust loss is reduced to under 0.4 x0.4 = 16%
Upwind windbreak
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Dust trapped in front of windbreak
Most of rest falls out close to windbreak
Downwind windbreak
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Founded in 1944.
Based in Kansas City, USA
Independent not-for-profit institute
An internationally recognised problem solver
for Government and Industry
Specialists in wind pattern research
and modelling
For exploring non-standard
situations, WeatherSolve is pleased to be
able to work with the Midwest Research
Institute.
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www.WeatherSolve.com
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Canopy windbreak, NZ
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Inside canopy, winds outside appx 10 mph
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Grid windbreak system on Carembolas in South Florida
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Plywood plant, BC
Dual fabric layers >> upwind fabric
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Wind protection for iron slag
tipping area. 45ft high. NJ
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Portable windbreak for gravel crusher.
20ft high.
Towable or truckable.
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Causeway windbreak
for coal pile. Northern BC
40ft high on 30ft causeway
.
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Sulphur Stockpile
Aruba 40ft high.
Note overhanging top to curl wind along face of windbreak
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www.WeatherSolve.com
Combined windbreak, security fence and visual barrier - OR
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www.WeatherSolve.com
Cooling tower wind control for increased efficiency -NV
Truck dump safety and dust control - OK
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Several fences – over
9km total length
Between 15m and
30m high
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www.WeatherSolve.com
Windfence 2.5 km in
length, 20m high
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www.WeatherSolve.com Windfence 28m high
x 3.3 km in length
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www.WeatherSolve.com
Windfence 7m high x
120m in length
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Windbreak Components
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www.WeatherSolve.com
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www.WeatherSolve.com
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Many specialized
components.
A testing program for
new components for
strength and fatigue life
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Typical Heights (left to right)
10m to 20m small tripod
15m to 30m large tripod
15m to 30m 3 leg truss
2m to 15m cantilever pole
Note: all structures custom designed
Pole spacings typically 15m to
30m. (Usually longer spacings
for longer runs and higher
poles)
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www.WeatherSolve.com
Extreme Wind Considerations
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The stress-rated UltraclipThe following 3 pages show how it works to protect the structure in
extreme storms.Note- the stress release
mechanism can be set to any level chosen by the client and the
design engineers.
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NORMAL OPERATIONAll clips in placeShock loads from wind gusts absorbed by Fabric, cable , and plastic deformation of clips.
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UP TO 30% OVERLOADUpper clips in placeLower nylon clips have released allowing lower hemCable to billow out and spill about 30% of the load.
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OVER 30% OVERLOAD (or hem cable fatigue)Upper clips in placeLower hem cable has broken and fabric has pulled out of lockstrip mounted on poles.Some ripping may occur requiring a replacement panel
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Stress-rated clip
After hurricane Charlie with lower clips released and poles / cables intact.
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www.WeatherSolve.com
Productive environmentsfor all weathers
Custom designed to match your needs.Hurricane and cyclone tested
Bola(1988), Andrew(1992) Charley, Frances, Jeanne (2004)
30 yr worldwide design experience. Patented features.Effectiveness analyses available.
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TM