Case Studies - March 2011 1 CASE STUDIES.

1 Case Studies - March 2011

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CASE STUDIES


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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:


Conventional LogsConvenient as long as you don’t mind loading the systems and superb if you

have your own woodland


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!


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


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


Flint cottage (continued) Solar Voltaic

PV generates 60 - 70% electricity needs (3.06kWp)


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


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


Communal heating

Bruderhof community in East KentWhole community is involved in processing and seasoning the

woodfuel and loading the boiler


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


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)


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.


Village scale woodheat: West Dean


West Dean – district heating network


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


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


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

Case Studies - March 2011 1 CASE STUDIES.

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