Specific heat capacity of wood/Specificni toplinski kapacitet drva

Specific heat capacity is defined as the amount of heat that a kilogram of a given substance is required to absorb in order to increase its temperature by one degree. The temperature of a given substance can change either at constant pressure or at constant volume, so we differentiate between specific heat capacity at constant pressure (cp) and specific heat capacity at constant volume ([c.sub.v]). When doing research into the heat properties of wood, the quantity that most frequently remains constant is pressure, thus restricting our study on specific heat capacity to cp. This paper provides an overview of the research that has so far been carried out into the specific heat capacity of wood depending on the temperature and moisture content. An analytical and graphical comparison has been performed of the results published in the Wood Industry Manual (1967) (DIP), Wood Handbook (1999) (WH) and work published by Deliiski (2012) (DEL). Key words: specific heat capacity, wood, moisture content, temperature Specificni toplinski kapacitet definiramo kao kolicinu topline koju kilogram neke tvari treba primiti da bi povecao svoju temperaturu za jedan stupanj. Temperatura neke tvari moze se mijenjati uz konstantan tlak ili konstantan volumen, pa razlikujemo specificni toplinski kapacitet pri konstantnom tlaku (cp) i specificni toplinski kapacitet pri konstantnom volumenu ([c.sub.v]). Pri ispitivanju toplinskih svojstava drva najcesce je tlak velicina koja ostaje konstantna, zbog cega se nasa razmatranja specificnoga toplinskog kapaciteta ogranicavaju na cp. U radu su prikazani rezultati dosadasnjih istrazivanja cp drva u ovisnosti o temperaturi i sadrzaju vode. Obavljena je analiticka i graficka usporedba rezultata objavljenih u Drvnoindustrijskom prirucniku (1967.) (DIP), Wood Handbooku (1999.) (WH) i radu Deliiskog (2012.) (DEL). Kljucne rijeci: specificni toplinski kapacitet, drvo, sadrzaj vode, temperatura