Specifications

Ash content 0.5% 1-3% 0.5 % 0.5%
Dimensions 6-8mm diameter
10-20mm length
3-45mm
(variable)
Variable 65mm diameter 25-200mm
length
Density 652 kg/m
3
214 kg/m
3
(variable)
350 kg/m
3
(slightly
variable)
450-550 kg/m
3
Specic volume 1.53 m
3
/tonne 4.67 m
3
/tonne 2.86 m
3
/tonne 1.82-2.22 m
3
/tonne
Energy content 4.8 kWh/kg 3.4 kWh/kg 4.0 kWh/kg @ 20%
moisture content
4.7 kWh/kg
Source Bioheat II
Calculator
Bioheat II
Calculator WFBIP
WFBIP WFBIP
Table 1: Typical wood fuel characteristics for domestic use
One of the most important properties of wood which has an inuence on its energy content per kg (caloric
value) is the moisture content (see below).
Pellet marker used in Austria.
Moisture content
Pellets
8%
Chips
30% or less
Logs
40–60% fresh
Briquettes
8% dried
Energy Content Vs Moisture Content
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0%
10%
20%
30%
40%
50%
60%
70%
80%
Moisture Content (by
weight)
Net Energy Content
(kWh/kg)
Eect of moisture content on net
energy content of wood fuel – the chart
highlights the useful energy content of
the wood decreases signicantly as the
moisture content increases. The energy
content of the “dry” element (or dry
matter) of the wood remains the same but
as the moisture content increases you are
eectively purchasing more water, adding
extra weight, and therefore the energy per
kg is reduced.
Energy Content Vs Moisture Content