20.500.12556/RUL-120425 Spremljanje konvekcijskega komorskega sušenja lesa z računalniško tomografijo Use of CT-scanning to analys convectional kiln drying of wood Sušenje lesa evkalipta (Eucalyptus nitens) je zahteven postopek, saj je ta vrsta zaradi inherentnih lastnosti zelo dovzetna za sušilne napake. Izvedli smo konvekcijsko komorsko sušenje 27 mm in 47 mm debelih preizkušancev pri temperaturah med 25 °C in 90 °C, pri ravnovesni vlažnosti 16 % ter hitrosti zraka 1 m/s. Kinetiko sušenja ter razvoj sušilnih napak smo kontinuirano spremljali z medicinskim CT-skenerjem z rentgenskimi žarki. Proučevali smo razvoj površnskih razpok ter kolapsa, s pomočjo CT-števila pa smo po Watanabe-jevi metodi določali lesno vlažnost. S CT-skeniranjem smo potrdili, da počasno sušenje pri nizki temperaturi omili obseg in podaljša čas razvoja kolapsa in površinskih razpok. Drying of eucalyptus (Eucalyptus nitens) is a demanding process, as this species is very susceptible to drying defects due to its inherent properties. We performed convectional kiln drying of 27 mm and 47 mm thick specimens at temperatures between 25 °C and 90 °C, at an equilibrium moisture content of 16 % and an air velocity of 1 m/s. Drying kinetics and the development of drying defects were continuously monitored with a medical X-ray CT scanner. We studied the development of surface checking and collapse, and with the help of CT-number we determined the moisture content of wood according to the Watanabe method. CT scans confirmed that slow drying at low temperature reduce the extent and prolongs the development time of internal cell collapse and surface checking. les evkalipt sušenje sušilne napake računalniška tomografija wood eucalyptus drying drying defects computer tomography true false false [A. Ahec] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2020-09-20 07:16:08 2020-09-20 07:16:12 2022-09-01 03:58:55 0000-00-00 00:00:00 2020 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*847 181319 29357571 11101.pdf 11101.pdf 1 8F8C012C92C37287B31E359628C4BCE3 fa928bcf69213912f4eb4c7d6f93ea75d7511a16f10ff8b3a17d02b04d956caa 15961f7d-a1ba-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=135220 Biotehniška fakulteta 0 0 0