Wss Powerpoint Wind And Dust Jan 2012 Show

www.WeatherSolve.comSince 1986

www.WeatherSolve.com

About WeatherSolve Structures

Windbreak research

Examples of windbreaks

Windbreak components

Extreme wind considerations

www.WeatherSolve.comAt WeatherSolve we have been researching, developing,

designing, and building wind fences for over 30 years.


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.


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.


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

http://www.chesapeakeboathouse.org/home.html



Dustbowl Storm (1930’s)

Early wind fence research focused on controlling wind erosion Contractors discussing kiwifruit

shelter erection techniques, NZ


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.


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


Dust erosion from a pile


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


Dust trapped in front of windbreak

Most of rest falls out close to windbreak

Downwind windbreak

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.

http://www.mriresearch.org/


2D simulation



Results





Canopy windbreak, NZ


Inside canopy, winds outside appx 10 mph


Grid windbreak system on Carembolas in South Florida

Plywood plant, BC

Dual fabric layers >> upwind fabric


Wind protection for iron slag

tipping area. 45ft high. NJ


Portable windbreak for gravel crusher.

20ft high.

Towable or truckable.


Causeway windbreak

for coal pile. Northern BC

40ft high on 30ft causeway

.


Sulphur Stockpile

Aruba 40ft high.

Note overhanging top to curl wind along face of windbreak


Combined windbreak, security fence and visual barrier - OR


Cooling tower wind control for increased efficiency -NV

Truck dump safety and dust control - OK


Several fences – over

9km total length

Between 15m and

30m high


Windfence 2.5 km in

length, 20m high

www.WeatherSolve.com Windfence 28m high

x 3.3 km in length


Windfence 7m high x

120m in length


Windbreak Components




Many specialized

components.

A testing program for

new components for

strength and fatigue life


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)


Extreme Wind Considerations


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.


NORMAL OPERATIONAll clips in placeShock loads from wind gusts absorbed by Fabric, cable , and plastic deformation of clips.


UP TO 30% OVERLOADUpper clips in placeLower nylon clips have released allowing lower hemCable to billow out and spill about 30% of the load.


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


Stress-rated clip

After hurricane Charlie with lower clips released and poles / cables intact.


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.


TM

Wss Powerpoint Wind And Dust Jan 2012 Show

Documents

wind fences

wind tunnel

wind speeds

wind pattern research

windbreak downwind windbreak

searly wind fence research

upwind windbreak

sheltererosion wind