A water-storage tank which is integrated into the heating system, used to collect and store heat energy and smooth out demand variation.
Cultivation of trees and shrubs, and the study of how they grow and the environment they grow in. Arboricultural arisings can be a source of low-quality wood fuel, with high moisture content.
Ash is a non-combustible, mineral content of biomass formed during combustion. There are two types: bottom (or bed) ash left behind, in or under the grate. It can melt or fuse, when it is then referred to as slag or clinker. The other type of ash is the very small particulate type, carried out of the system along with the flue gases. This is referred to as fly ash, and can be removed by filtering.
Corkscrew type feed mechanism for automatic transfer of chip or pellet to the boiler.
A rotating arm at the base of the fuel store to prevent bridging and maintain consistent feedstock to the auger.
A small thermal store used to absorb the output of a the boiler during shut down, and provide initial heat from stored capacity on start up whilst boiler comes up to operating temperature.
The minimum heat demand from a system which is
maintained throughout a defined period.
A (typically) log boiler that will fully burn the fuel load for a period of time, with the output typically being used to heat a thermal store to meet daily demand.
A small water boiler for domestic hot water fitted to stoves used for hot water and central heating.
Biomass Energy Centre (BEC)
The Forestry Commission’s UK Centre of Expertise on Biomass.
Larger log-type fuel made from compressed sawdust/co-product/energy crop.
Confederation of Forest Industries –Trade Association for Commercial Forestry in the United Kingdom.
Wood fuel produced as a secondary product from virgin timber that is ‘clean’ wood (i.e. sawdust from saw mill activity made into pellets, or fro tree felling).
Crops grown specifically for dedicated energy production purposes (e.g. miscanthus).
Energy Supply Company – contracts to supply heat to the end user, and may or may not own, operate and maintain boiler as well as supplying fuel.
The United Kingdom Government Agency responsible for strategic direction and management of Woodland.
Another word for Briquette.
Renewable Heat Incentive (RHI)
A new UK scheme to give payments to the end user of renewable heat rather than a grant for installation, due for introduction in 2011.
Short Rotation Coppice
Fast growing wood fuel crops, such as Willow.
The offcuts from sawmilling of felled trees – a useful co-product for wood fuel.
An enclosed fire.
A hot/warm air stove that heats room through convection.
A large heat store (hot water) used to balance the overall heat load of the system, allowing a smaller size boiler to run more efficiently over a daily cycle. Often run with a buffer vessel, which can also be integral to the thermal store. Thermal stores can also contain multiple heating cols to allow other heating systems (such as solar thermal panels) to be integrated.
Wood that is used for wood fuel that has been contaminated in some way in its primary use (i.e. painted timber, demolition timber), which if used as fuel, needs to be burnt in conditions that conform to the Waste Incineration Directive.
Wood fuel of a certain size and quality suitable for auger – type mechanisms to automatically feed into boilers.
Co-Product compressed so that natural bonding agents within the wood bind it together into uniform sized fuel pieces that are suitable for automatic handling. Have a higher energy density than woodchip, and is suitable for smaller/restricted sites.