Promene vlažnosti elemenata bukve i jasena tokom dve godine izlaganja u sobnim uslovima

Abstract

Predmet ovog rada je analiza promena vlažnosti drveta bukve i jasena tokom dve godine u sobnim uslovima (zimi grejanje, leti bez klimatizacije). Registrovane promene vlažnosti su prvenstveno rezultat promena relativne vlažnosti vazduha (merena je kapacitivnim sondama). Prosečne relativne vlažnosti vazduha u enterijeru su danas niže nego nekada što je pokazano i u ovom eksperimentu (prosečna relativna vlažnost vazduha tokom dve godine je iznosila 44%). Najnižu vlažnost je drvo dostizalo u vrlo hladnim zimskim danima kada je prostorija zagrevana i tokom noći - između 5% i 6%, a najvišu početkom juna: 10,4-10,9%. Očekivano, vlažnost drveta nije dostizala ravnotežnu vlažnost - tokom zime je vlažnost drveta za oko 1% viša, a leti niža i do 2,5% od ravnotežne. Potvrđena je preporuka da se rezana građa lišćara od koje će se izrađivati proizvodi za enterijer suši na 7-8% vlažnosti.

The subject of this paper is the analysis of moisture content (MC) changes of beech and ash wood during two years in room conditions (heating during winter; no air conditioning during summer). The registered MC changes are primarily the result of changes in relative humidity of the air (measured by capacitive probes). The average relative humidity of the air in the interior is lower today than in the past, as also shown in this experiment (the average relative humidity of air during two years was 44%). The lowest wood MC was reached on very cold winter days when the heating was on even during the night - between 5% and 6%, and the highest one at the beginning of June: 10.4-10.9%. As expected, the wood did not reach equilibrium moisture content - during winter, MC is by about 1% higher, and in summer it is lower by up to 2.5% than the equilibrium. The recommendation that the sawn timber from which the interior products will be made should be dried at 7-8% MC was confirmed.