case studies - march 2011 1 case studies
TRANSCRIPT
1 Case Studies - March 2011
www.woodheatsolutions.eu
CASE STUDIES
2 Case Studies - March 2011
The sole responsibility for the content of this presentation lies with the authors. It does not necessarily reflect the opinion of the European Union. the European Commission is
not responsible for any use that may be made of the information
contained therein
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Wood is a little like crude oil, it can be refined into different
products, each of which suites a particular use
– just like diesel or petrol
Conventional logsWood ChipsWood Pellets
Woodfuel types:
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Conventional LogsConvenient as long as you don’t mind loading the systems and superb if you
have your own woodland
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Wood burning stoves:Many types and styles available
Stove Industries Alliance:
estimate that in the UK:
160,000 stoves were fitted last year,
140,000 the year before, and
186,000 the year before that!
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Flint cottage (continued)
Wood fuel provides allhot water and spaceheating in winter
A combination of wood fuel and solar thermal work in the spring and autumn
Solar thermal provides all hot water in the summer
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Flint cottage (continued) A good thermal store is critical
• Solar thermal generates a third of hot water needed (5.1 kWth)
• Multifuel stove/ back boiler generates remaining space heat needs to a maximum of 19.2kWth
• 4kWe immersion heaters provide ‘frostating’ and emergency back up
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Flint cottage (continued) Solar Voltaic
PV generates 60 - 70% electricity needs (3.06kWp)
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Batch Boilers:Load once a day and draw heat from ‘accumulator’
• 30kW for 4 bed semi
• Installed for £7,000
• Uses > 12 tonnes of wood per year
Technology is ever more sophisticated – Austrian
KWB batch boiler
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Rodmell Community Firewood
Local people were frustrated by the poor
quality and cost of woodfuel available
locally.They are setting up
their own community woodfuel scheme. WhS linked them to a local estate to supply ‘cord wood’ for conversion
into logs, seasoning and delivery by the woodfuel group
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Communal heating
Bruderhof community in East KentWhole community is involved in processing and seasoning the
woodfuel and loading the boiler
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Wood pellets
Offer the convenience of an oil fired boiler, require less space and cope well
with varied loads – but the fuel costs more than logs or chips
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Wood Pellet systems:Many types available
Technology is ever more
sophisticated – Austrian KWB pellet boiler.
System designed to pneumatically draw a batch of pellets from an external pellet
store (similar to a heating oil tank in the
garden)
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WoodchipsWell suited to medium heat users but require space and easy access for the
woodchip storage.Particularly well suited to farms and estates with their own woodland and
farm equipment to facilitate self supply.
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Village scale woodheat: West Dean
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West Dean – district heating network
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Community woodheat:Hoathly Hill Community
• Residential community of 27 homes and about 70 people• Heating originally by Calor gas• Set up their own woodfuelled district heating system in 2007• See their Blog: http://home.btconnect.com/hoathlyhill/hhr/blog.html
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Lessons learnt by the community
• Invest in efficiency works first
• Invest in other renewables together e.g. electricity
• Beware of in-experienced M&E consultants
• Much cheaper for new build than retrofit
• Try to get more capital in up-front to reduce loan costs
• Insist on good post-commissioning support
• It will take a year bed-in, fine-tune and learn
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Boiler HouseTwo 500kW Herz boilers squeezed into the old boiler room providing the base load for a district heating system for the whole site. Max load cover from
another MW of oil
Adj primary school which may be
added to heat main in due course.
There’s another off to the NE
Chip store
Beacon Community College,Crowborough, East Sussex