HDG Lambda-Control 1 plus - Integrated Fuel Types

12
1.18 Integrated fuel types
Different types of wood, i.e. birch, spruce, beech etc., have different densities, resulting in different heating values. The
following values can be used as a guideline:
D = Density in %; Hu = Heating value kWh/kg; w = Water content in %
Type of Wood
D
%
Hu kWh/kg
Type of Wood
D
%
Hu kWh/kg
w: 15%
w: 0%
w: 15%
w: 0%
Copper beech
100
4.01
4.86
Aspen
69
4.13
5.01
Spruce
70
4.25
5.15
Pine
85
4.37
5.30
White beech
102
3.59
4.72
Poplar
61
3.79
4.81
Hornbeam
102
3.89
4.72
Trembling poplar
69
4.13
5.01
Birch
98
4.33
5.25
Linden
79
4.13
5.01
Ash
102
4.09
4.96
European aspen
69
4.13
5.01
Oak
102
4.21
5.10
Douglas fir
77
4.33
5.25
Turkey oak
113
4.21
5.10
Willow
78
4.09
4.96
Black pine
91
3.37
5.30
Swiss stone pine
67
4.33
5.25
Locust
110
4.09
4.96
Hazel
85
4.13
5.01
Larch
90
4.29
5.20
Bush wood chips
50
4.25*
5.15
Elm
97
4.13
5.01
Sawmill scraps - beech
70
4.01*
4.86
Maple
91
4.13
5.01
Sawmill scraps - spruce
50
4.25*
5.15
Acacia
91
4.13
5.01
Briquet - beech
250
4.01*
4.86
Fir
74
4.49
5.44
Briquet - spruce
190
4.25*
5.15
Alder
76
4.13
5.01
Comments and supplements:
Density (D): The density of the copper beech (1005) is used as basis to calculate the different values. Compared to this value,
spruce is 70%, beech is 98% and white birch is 102%.
E.g.: If the burning time of red beech is 6h it will take spruce 4.2h to burn.
Heating value (Hu): Is highly dependent on the water content (w); i.e.is the water content 30%, Hu of copper beech is
3.17kWh/kg and Hu of spruce is 3.36kWh/kg.
Fuel CO
2
max: An average maximum CO
2
content of 20.3% is assumed.
*Bulk material: Bulk material is often fuel that is notably shorter than determined by the manufacturer; i.e. on average shorter
than 30cm in the case of a 0.5m log boiler. The classifications “Sawdust scraps-beech” and “Sawdust scraps-spruce” represent all
hard and soft woods.
Refuel amount: Since the density of wood types varies, it is advisable to start with small amounts of fuel to gain experience.
With BSB the correct amount of fuel is calculated automatically, if 5.01 Type of wood is set correctly.
Mixed wood: Generally only fuel with the same density should be used together for one combustion. If different types of wood
with different densities are mixed, i.e. wood with a density of 100% and wood with D=70%, combustion errors can occur.
Because fuel with a density of 70% burns faster than the one with 100%. This can lead to hollowing. If mixing densities cannot be
avoided, the softer wood should be at the bottom and the hard wood should be placed above.
When using BSB the average value of the density and the heating value of the different types of fuel used needs to be calculated
in order to be able to choose the suitable type of fuel that must be set for the BSB function.
Example: Copper beech and spruce combined average the density and heating value of hazel (D=85%, Hu=4.25kWh/kg).