Viessmann VIESMANN VITOLIGNO 300-H, Техническое руководство

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Water content in % 0 5 10 15 20 25 30
Type of tree Unit of measurement
Beech kWh/kg 5.00 4.72 4.43 4.15 3.86 3.58 3.30
kWh/smt 2790 2770 2748 2723 2695 2664 2627
kWh/stcm 1953 1939 1923 1906 1887 1864 1839
kWh/tcm 1116 1108 1099 1089 1078 1065 1051
Oak kWh/kg 5.00 4.72 4.43 4.15 3.86 3.58 3.30
kWh/smt 2355 2835 2812 1786 2758 2726 2689
kWh/stcm 1999 1984 1968 1951 1931 1908 1882
kWh/tcm 1142 1134 1125 1115 1103 1090 1075
Poplar kWh/kg 5.00 4.72 4.43 4.15 3.86 3.58 3.30
kWh/smt 1765 1752 1738 1723 1705 1685 1662
kWh/stcm 1236 1227 1217 1206 1193 1179 1163
kWh/tcm 706 701 605 680 682 674 665
Relation of water content to moisture level in fuel
The proportion of water in wood fuels is given as either the water con-
tent or the fuel moisture level. The water content (in %) is relative to
the moist fuel mass or the fresh substance (FS); the fuel moisture level
is relative to the absolutely dry fuel mass (TS). The specifications for
Köb products use the water content w.
Example:
If 100 kg of fuel contain 50 kg water, the fuel has a water content of
50 % (w50) and a fuel moisture level of 100 % (u=100).
0 20 40 60 80 100 120 140 160 180 200
0
10
20
30
40
50
60
70
Fuel moisture level (u) in %
Water content (w) in %
Determining the wood fuel demand
The amount of wood fuel required can be calculated on the basis of
the net calorific value and the required rated heating output. Significant
influencing factors for this are the water content of the fuel and the
efficiency of the system.
B =
Q
N
H
u
x η
B Amount of fuel required in kg/h
Q
N
Required rated heating output in kW
H
u
Net calorific value kWh/kg
η System efficiency in %
Principles of wood combustion
(cont.)
VITOLIGNO 300-H
VIESMANN
5
5672 507 GB
1