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Energy consumption of beech timber drying in oscillation climates/Potrosnja energije tijekom oscilacijskog susenja bukovih piljenica
Ist Teil von
Drvna industrija, 2014-12, Vol.65 (4), p.309
Ort / Verlag
Sveuciliste U Zagrebu
Erscheinungsjahr
2014
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
The influence of applying the oscillations of air parameters during conventional drying of beech timber on energy consumption is discussed in the paper. A special drying software was created to enable the input of frequency (in hours) and amplitude (in percents) of oscillations. Altogether 12 drying runs were carried out: three conventional ones and nine by using the same schedule but with oscillations of equilibrium moisture content (EMC), temperature and the combination of these two. The combinations of two amplitudes (10% or 20%) and two frequencies (3 or 6 hours) were applied in different test runs. The results indicated that all test runs had energy consumptions proportional to drying time, with an important influence of the outside temperature. In runs with oscillations, often climate changes influenced to some extent the total energy consumption, especially in runs with short phases (3 hours) and high amplitudes (20%). Despite frequent climate changes, it can be expected that the usage of oscillations would lead to the same or even lower energy consumption than in conventional beech timber drying, especially when shorter drying time is reached. Key words: wood drying, energy consumption, conventional drying, oscillation climates, beech timber Cilj istrazivanja bio je ustanoviti utjecaj oscilacije parametara zraka tijekom konvencionalnog susenja piljene bukove grade na potrosnju energije. Izraden je poseban program koji je omogucivao regulaciju frekvencije (u satima) i amplitude oscilacija (u postocima). Provedeno je ukupno 12 ciklusa susenja: tri konvencionalnim rezimima i devet ciklusa istim rezimom, ali s oscilacijom vlage ravnoteze, temperature ili kombinacijom oscilacije obaju parametara. Primijenjene su dvije amplitude (10% i 20%) te dvije frekvencije (3 i 6 sati) u razlicitim ciklusima susenja. U svim postupcima susenja potrosnja energije bila je razmjerna vremenu susenja, uz znacajan utjecaj vanjske temperature. U ciklusima susenja s oscilacijom parametara susenja cesta promjena klime, posebno uz kraca vremena promjene (3 sata) i pri vecim amplitudama (20%) imala je znacajan utjecaj na potrosnju energije. Usprkos cestim promjenama klime, moze se ocekivati da je potrosnja energije u rezimima s oscilacijom klime jednaka ili cak niza u usporedbi s konvencionalnim rezimom susenja, posebno zbog ocekivanoga kraceg vremena susenja. Kljucne rijeci: susenje drva, potrosnja energije, konvencionalno susenje, oscilacija klime, bukova grada