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September 2010 1 Wood to Warmth – Biomass Fuels and Heat Energy Calculations Michael Beech TV Energy.

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Presentation on theme: "September 2010 1 Wood to Warmth – Biomass Fuels and Heat Energy Calculations Michael Beech TV Energy."— Presentation transcript:

1 September Wood to Warmth – Biomass Fuels and Heat Energy Calculations Michael Beech TV Energy

2 September Biomass Fuels As general guide, the energy available from different biomass fuels can be summarised as follows: Logs Seasoned to 20%MC, 4100kWh/tonne, 1900kWh/m3 (hardwood, stacked), 1400kWh/m3 (softwood, stacked) Pellets <10%MC, 4700kWh/tonne, 2800kWh/m3 minimum Chips 30%MC, 3300kWh/tonne, 950kWh/m3 (hardwood), 720kWh/m3 (softwood)

3 September Biomass Fuels CV hardwood (broadleaves) = CV softwood (eg. pine, SRC) Higher growth rate of softwood offset by its lower energy density

4 September Biomass Fuels Moisture content, energy, density comparisons

5 September Biomass Fuels - Costs

6 September Heat Energy Calculations Calculating heat load & woodfuel use Fuel bills (existing build) -> kWh i/p -> system efficiency -> kWh o/p -> % from biomass boiler -> biomass efficiency -> Biomass fuel kWh -> biomass fuel kWh/tonne -> tonnes/m3 System efficiency – old boilers, EE improvements possible? Biomass boiler heat >90% of annual heat load ideally Biomass efficiency – losses during start up, thru buffer tank For new build, need to know the calculated annual heat demand to determine woodfuel use

7 September Heat Energy Calculations Heat loads – Mixed commercial/ domestic Winter Summer

8 September Heat Energy Calculations Heat load variation - seasonal January June/ July December

9 September Heat Energy Calculations Biomass and conventional boilers - winter Heat outputs. 150kW biomass boiler, 350kW oil boiler Buffer tank activity. 5000litre, 20deg.C deltaT

10 September Heat Energy Calculations Biomass boiler - summer Heat output Buffer tank activity

11 September Heat Energy Calculations Summer heat supply – alternative options Additional smaller o/p biomass boiler – higher capital cost, available space, central heat losses vs. heat use, cost/ benefit, flexibility Conventional boiler – convenience, use existing? energy costs / CO 2 emissions Electric immersion heating – convenience, low capital cost, highest operating cost/ CO 2 emissions, night rate option? Solar thermal system – capital cost, space requirements, orientation, lowest operating cost/ CO 2 emissions, size carefully, cost/ benefit vs. biomass fuel use

12 September Thank you


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