Prilog istraživanju promjene gustoće prefabriciranog cijepanog ogrjevnog drva obične bukve (Fagus sylvatica L.) uslijed prirodnog sušenja

master's thesis

• Title (english): Contribution to study of changes in prefabricated-split firewood density of European beech (Fagus sylvatica L.) due to air drying
• Author: Juraj Aničić
• Mentor: Josip Ištvanić (mentor)
• Committee member: Josip Ištvanić (predsjednik povjerenstva)
• Committee member: Alan Antonović (član povjerenstva)
• Committee member: Nikola Španić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Forestry and Wood Technology; (Institute of Materials Technology); Zagreb
• Defense date and country: 2016-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Wood Technology; Wood Technological Processes

Abstract

U radu su eksperimentalno i teorijski istraženi utjecaji parametara
vlage, mase, volumena i gustoće prefabriciranih cjepanica ogrjevnog drva
zbog velikog značaja na komercijalno poslovanje takvim drvom. Istraživanje je
provedeno na uzorku od 209 komada cjepanica. Cjepanice su izrađene u
jednom specijaliziranom proizvodnom pogonu mehaniziranom tehnologijom
uz korištenje motorne lančane pile, tračnih pila i hidrauličkih cjepača. Svaka
cjepanica je za potrebe istraživanja izmjerena i obilježena... More pločicom, te je na
njima provedeno mjerenje mase, dimenzija i vlage u sirovom i prosušenom
stanju. Prirodno sušenje izvedeno je na zaklonjenom i dobro provjetrenom
dijelu stovarišta cijepanog ogrjevnog drva. Sušenje cjepanica je trajalo u
vremenskom periodu od 23.3.2015. do 9.10. 2015., odnosno ukupno 200
dana.
Prosječan sadržaj vode u cjepanicama prije sušenja iznosio je
66,02%. U prosušenom stanju, prosječan sadržaj vode u cjepanicama iznosio
je 15,74%. Prosječna vrijednost mase cjepanica obzirom na sve izmjerene
cjepanice u sirovom stanju iznosila je 1,69 kg, a u prosušenom stanju je ta
vrijednost smanjena na 1,19 kg. Gledano obzirom na sirovo stanje, gubitak u
masi iznosio je prosječno 29,5% U sirovom stanju, aritmetička sredina
volumena svih cjepanica iznosila je 0,00171 m³, dok je u prosušenom iznosila
0,00148 m³. Gledano obzirom na sirovo stanje, smanjenje volumena iznosilo
je prosječno 13,4%. Aritmetička sredina za gustoću cjepanica u sirovom
stanju iznosila je 988,71 kg/m³, a za prosušeno stanje iznosila je 806,76
kg/m³. Gledano obzirom na sirovo stanje, smanjenje gustoće iznosilo je
prosječno 18,2%. Less

Abstract (english)

In this research are experimental and theoretical explored
parameters of moisture, mass, volume and density of prefabricated
split firewood, because of great importance to commercial trading
with firewood. Whole study was spent on 209 samples of split
firewood. Split firewood was made in specialized factory with
mechanized technology. The tools and machines which have been
used there were chainsaws, bandsaws and hydraulic log splitters.
Each firewood piece was measured and marked with a... More purpose of
measuring mass, dimensions and moisutre in raw and dryish
condition. Air drying was held on windy and sheltered company area
and it took 200 days, from 23.3.2015. to 9.10.2015.
Average value of firewood moisture before drying was
66,02%. In dryish condition, average value of firewood moisture was
15,74% Average value of firewood mass in raw condition is 1,69 kg,
while in dryish condition, average value was reduced to 1,19 kg.
Considering raw condition, loss on mass was 29,5%. In raw
condition, average value of firewood volume was 0,00171 m³, while in
dryish condition, it was 0,00148 m³. Considering raw condition,
average value was 13,4%. Average value of firewood density in raw
condition is 988,71 kg/m³, and in dryish condition is 806,76 kg/m³.
Considering raw condition, density was reduced to 18,2%. Less

• Keywords: Obična bukva (Fagus sylvatica L.); gustoća; vlaga; masa; volumen; ogrjevno drvo; prirodno sušenje
• Language: croatian
• URN:NBN: urn:nbn:hr:108:411030
• Study programme: Title: Wood Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka drvne tehnologije (magistar/magistra inženjer/inženjerka drvne tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-11-24 11:06:34