Final Green Bug
Transcript of Final Green Bug
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The Archimedes Screw environmental impacts, opportunities,
and challenges as an Emergent Hydro Techonology in CANADA.
Date: 5 May 2011 Presented by: Tony Bouk VP Business Development
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Archimedes Screw
1645 Hwy#3, Delhi, ON, N4B 2W6T: 519 582 8563GreenBug Energy Inc.
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The weightof water falling
through the screw turns the
screw which turns the gear
box and generator and
produces electricity as it
turns.
The diameterof the screw
increases as the design flow
increases.
The length of the screwincreases as the head or
vertical drop increases.
How it works
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Technology OverviewOur Form of Emergent Hydro
Type of Turbine ArchimedesScrew
KW Size Micro (10-100 KW) Pico (1KW 10KW) (1KW powers an average home)
Heads Head Levels of 1-10 Meters, very low but still very useful.
Flows 200 liters/ sec 6000 liters/sec (1000 lps = 1 cubic meter/sec)
Run of River water flows are not managed, naturally occurring flows are
maintained.
Application for use on small water control structures already in existence old mills sites, reservoirs, etc. Thousands across Canada. (10,000+)
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The Archimedes ScrewThen
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Inventedin 200 AD --- by --- Archimedes
Usedto pump water up and irrigate land
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Still used to pump water up
Used extensively in sewage treatment plants due to
robust design
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Now
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The Archimedes Screw
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Havebeen used in Europe for about 10 years to generate electricity.
None in Canada to date that we are aware of.
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To generate electricity
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Environmental IssuesSafe Fish Passage
Fish can Safely Pass through the screw (down)
image Extensive fish passage tests in the UK have conclusively demonstrated
that the large water chambers and slow rotation of the ArchimedesScrew allow fish of all sizes safe passage through the turbine. As a result,
the Environment Agency in the UK has agreed that no screening is
required.
Fish Pumps
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In fact Archimedes screws are used as fish Pumps in the aquaculture
industry to move fish.
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The screw does not affect the upstream passage of fish, however
it does allow safe downstream passage
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Environmental IssuesEquipment related
Lower Bearing the submerged lower bearing is a water lubricated composite
that requires no grease or a sealed submersible bearing.
Upper Gearbox contains food grade oil
Protective Coating on the steel screw after application and hardening thecoating is chemically inert- potable water coatings can be used but are not in
Europe.
Sitework minimal concrete site work is necessary to install the screw beside the
existing water control structures. Existing control structures are unaffected.
Equipment is Manufactured off site because the screw is manufactured off-
site and then installed by crane beside existing water control structures,disturbance to stream beds and water flows is minimal during installation.
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Environmental IssuesWater Resources
100% of water is returned to the water course essentially part of the water just
travels down the screw instead of over the dam
Does not increase the height of the existing water control structure
Does not affect the water level above or below the water control structure
Existing natural flows are maintained In this run of river type of installation flows
are not managed in any way. (operational range of screw down to 15% of max flow)
There is no depleted reach because the screw is installed beside the existing water
control structure and the water is returned at the base of the structure there is no
depleted reach.
Will not affect water turbidity water is pulled from top of impoundment the same
as water flowing over dam.
Will not affect the flood flow capacity of the existing water control structures
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Opportunities NowFor the Archimedes Screw
image
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Many sites thousands ofsmall low head sites across
Canada (10,000+ according to
Hatch)
An example to the left are
the sites located around the
GreenBug location in Delhi,Ontario.
Carbon reduction there is
the opportunity to generate
electricity in a distributed
renewable way right where it is
used and sell it to the gridunder the new FIT programs.
Using existing infrastructure
and without large transmission
lines
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Existing ChallengesFacing the Archimedes Screw use on small hydro sites (1kw 100kw)
Approval time and cost relative to a small systems ability to paythese are much
smaller hydro developments than Canada is used to. They are similar in size and cost to
the numerous solar panel installations now dotting the landscape. Therefore, from a
financial standpoint we cant spend 10s of thousands of dollars or more and years on
uncertain approvals or those 10,000 + sites will never be developed in Canada.
Were going to need the equivalent ease and certainty of a building code of best
practices andbuilding permitapproval and its subsequent oversight by an inspector.
Luckily we have 10 years of European experience and research to draw on
A way forward were proposing a way forward within current policy a more adaptive
management approach which utilizes all available research, knowledge and
experience with Archimedes screws to form a series of Building code or Best practice
checklists, with a focus on installation and post construction monitoring, with policy and
best practices adapting as we go forward.
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Small Archimedes Screw 53
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See full video tour at www.greenbugenergy.com/testsitevideo1.wmv & www.greenbugenergy.com/testsitevideo2.wmv
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GreenBug Energy Inc.