La Nordica Monoblocco Ghisa 750 Piano [22/52] Calculation of the thermal power

MONOBLOCCO GHISA 750 - MONOBLOCCO IRONKER 750

22 6099751 - IT-EN-DE-FR

12.4. MAINTENANCE OF THE EXTENSIBLE GUIDES

To work silently, as well as in a reliable and robust way, the doors are fastened to the extensible ball guides. By using the device continuously,

the lubricant of the guides tends to run out progressively in time making their sliding more difcult and noisy. For this reason, together

with each device a high temperature grease is supplied in order to make the lubrication of the guides possible for the user, in case it

becomes necessary (excessive noise or reduction of smoothness). After having completely lifted the door of the stack, using a syringe,

apply internally on the track on a visible point, as high as possible, two grease balls (corresponding to 0.5 ml of the graduated scale of the

syringe). Pay attention not to exceed the suggested quantity. Repeat the same operation on the other track and lift and lower the door many

times so that the grease distributes on all balls. CAUTION: use exclusively the grease supplied by La NORDICA.

13. 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 caloric value necessary for a properly insulated room is 30 kcal/h per m

(for

an external temperature of 0°C).

Given that 1 kW corresponds to 860 kcal/h, it is possible to adopt a value of 38 W/m

Let’s suppose one wishes to heat a room of 150 m

(10 x 6 x 2.5 m) in an insulated apartment. In this case, it is necessary to have 150 m

x 38 W/m

= 5700 W or 5,7 kW. As main heating, a 8 kW device is therefore sufcient.

Approximate combustion value Required quantity in relation to 1 kg of dry

wood

Fuel Unit kcal/h kW

Dry wood (15% humidity) kg 3600 4.2 1,00

Wet wood (50% humidity) kg 1850 2.2 1,95

Wood briquettes kg 4000 5.0 0,84

Brown coal briquettes kg 4800 5.6 0,75

Normal anthracite kg 7700 8.9 0,47

Coke kg 6780 7.9 0,53

Natural gas m

7800 9.1 0,46

Naphtha L 8500 9.9 0,42

Electricity kW/h 860 1.0 4,19