Brunner Panorama - Page 7

For example: Dry wood has a calorific value of approx. 4 kWh/kg, fresh-
ly cut wood only 2 kWh/kg. You will need twice the amount of wood to
achieve the same heating power.
Water content g/kg
wood
Calorific value
kWh/kg
Consumption
raised by %
very dry 100 4,5 0
stored for 2 years 200 4 15
stored for 1 year 350 3 71
freshly cut wood 500 2,1 153
Natural firewood (left) is the
best fuel for fireplaces, but you
can use also wood briquettes
according to DIN 17225-3,
Class A1, length >14 cm (5.51
in), diameter >8 cm (3.15 in)
(right).
What amount of heat will I get when buying wood
per weight?
1 cubic meter freshly cut
wood
Water content 50% 500 kg x 2,0 kWh/kg = 1000 kWh
1 cubic meter dried wood Water content 30% 500 kg x 3,3 kWh/kg = 1650 kWh
1 cubic meter dry wood Water content 15% 500 kg x 4,1 kWh/kg = 2050 kWh
© 2023 Brunner GmbH User Manual Panorama-Fireplace (1.47) 7