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ITALIANO
COMBUSTIBILE
Il combustibile prescritto è legno, asciutto, di pezzatura del diametro di 80 150 mm, stagionato per almeno 2 anni, contenente
umidità non superiore al 15-20%, con potere calorica di 4,7 kW/kg e lunghezza dei ceppi da 500 mm.
Le dimensioni dei combustibili da usare si trovano nel paragrafo “CARATTERISTICHE TECNICHE”.
Dati base riguardanti la combustione del legno.
Nel graco successivo indichiamo l’interdipendenza tra l’acqua contenuta e la potenza termica del combustibile . Il volume energetico
utile del legno scende signicativamente in rapporto alla quantità di acqua.
Le caldaie non sono adatte per bruciare legno contenente meno del 12% di acqua poiché al di sotto di questo valore la gasicazione
diventa incontrollabile
Potere calorico inferiore dei principali tipi di legno
Tipo di legno Potere calorico per 1 kg con umidità del 20%
kcal kJoule kW/kg
Abete 3.900 16.250 4,5
Pino 3.800 15.800 4,4
Larice 3.800 15.800 4,4
Cerro 3.600 15.100 4,2
Pioppo 3.500 14.760 4,1
Olmo 3.500 14.760 4,1
Betulla 3.750 15.500 4,3
Quercia 3.600 15.100 4,2
Faggio 3.450 14.400 4,0
Sconsigliamo l’uso di legname fresco in quando produce molto fumo, abbrevia radicalmente la vita della caldaia e della canna
fumaria, inoltre riduce la potenza della caldaia del 50% .
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