 |
Definition and origin:
Still the fuel most widely used by individuals, in the form of round billets or quarters, 33 cm, 50 cm or a metre in length. The unit of measurement, sometimes called a “stere”, corresponds to a cubic metre of stacked logs. |
Use:
Logs are recommended in open fireplaces and wood-fuelled boilers and stoves. They must be dry (with less than 25% moisture, implying that they have been dried for 1 2 years). Damp logs produce up to 50% less energy. Source: www.hespul.org |
Power:
1,500 to 2,000 kWh per cubic metre with moisture content not exceeding 25%. |
| |
|
 |
Definition and origin:
This source is sometimes called “blocks”, and is made by grinding up branches and other items produced in forestry or landscaping (such as the tops of trees or residual trees), or from industrial activities (uncontaminated pallets etc.). The blocks are 2 5 cm long, and the unit of measurement is the “stacked cubic metre”. |
Use:
Storing it requires a large volume, and a reserve stock in rural settings (where there is living accommodation, agricultural holdings and large buildings, etc.) or buildings owned by the community or with an industrial use. |
Power:
3,300 to 3,900 kWh per stacked cubic metre having a moisture content of 20 30%. |
| |
|
 |
Definition and origin:
Made from sawdust not containing any glue or additives, compressed at very high pressure, producing pellets 6 10 mm in diameter and 1.5 2.5 cm long. |
Use:
The pellets, intended for enclosed and other space heaters and for automatic boilers, are available in 15 and 20 kg bags, big bags (of 750 kg), and in bulk, supplied by blower trucks. |
Power:
The pellets have a very low (10%) moisture content, resulting in a high calorific value (5,000 kWh per tonne). |
| |
|
Find out everything about wood energy
