SANNOVER 5010 DITA Manuel D'instructions page 27

CALCULATION OF THE THERMAL POWER
There is not an absolute rule for calculating the correct necessary power. This power is given according to the space to be heated, but it
depends also largely on the insulation. On an average, the calorifc value necessary for a properly insulated room is 30 kcal/h per m3 (for
an external temperature of 0°C).
Given that 1 kW corresponds to 860 kcal/h, it is possible to adopt a value of 35 W/m3.
Let's suppose one wishes to heat a room of 150 m3 (10 x 6 x 2.5 m) in an insulated apartment. In this case, it is necessary to have 150
m3 x 35
W/m3 = 5250 W or 5,25 kW. As main heating, a 8 kW device is therefore sufcient.
PICTURE - 01
1. Steel flue with double chamber insulated with material resistant to 400°C. Effciency 100% excellent.
2. Refractory flue with double insulated chamber and external coating in lightweight concrete. Effciency 100%
excellent.
3. Traditional clay flue square section with cavities. Effciency 80% good.
4. Avoid flues with rectangular internal section whose ratio differs from the drawing. Effciency 40% poor
PICTURE - 02
1. Industrial chimney cap with pre-fabricated elements – it allows an excellent discharge of the smokes.
2. Handicraft chimney cap. The right output section must be at least twice as big as the internal section of the flue
(ideal value: 2.5 times).
3. Chimney cap for steel flue with internal cone deflector of smokes.
4. In case of flues side by side, a chimney cap must be higher than the other one of at least 50 cm in order to avoid
pressure transfers between the flues themselves.
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