Convective Drying of Beech Lumber without Color Changes of Wood

This paper presents the results of analyzing the influence of suggested regimes of chamber drying of beech lumber with the thickness h = 40 mm, h = 60 mm and h = 80 mm from the initial moisture content Wp = 70 % to the final moisture content Wk = 8 %. The regimes ensure the preservation of the natur...

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Autores principales:	Ladislav Dzurenda, Nencho Deliiski
Formato:	article
Lenguaje:	EN
Publicado:	University of Zagreb, Faculty of Forestry and Wood Technology 2012
Materias:	beech lumber convective drying regime of drying color of wood Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/7a4f3882846e4dd68c06fb70980bb108
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spelling	oai:doaj.org-article:7a4f3882846e4dd68c06fb70980bb1082021-12-02T03:31:51ZConvective Drying of Beech Lumber without Color Changes of Wood0012-67721847-1153https://doaj.org/article/7a4f3882846e4dd68c06fb70980bb1082012-06-01T00:00:00Zhttp://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=124236https://doaj.org/toc/0012-6772https://doaj.org/toc/1847-1153This paper presents the results of analyzing the influence of suggested regimes of chamber drying of beech lumber with the thickness h = 40 mm, h = 60 mm and h = 80 mm from the initial moisture content Wp = 70 % to the final moisture content Wk = 8 %. The regimes ensure the preservation of the natural color of the wood. The study results show that the drying of beech lumber according to the suggested regimes causes no changes in the chromophoric compounds of the wood and the beech lumber preserves its original white-yellow color. Quality parameters of the dried lumber, such as: difference between the average final moisture content and the required final moisture content, and the range of the final moisture and moisture gradient in dried beech lumber, classify this dried lumber into the first quality class. The suggested regimes for drying beech lumber using hot air in the temperature range ts = 37 ÷ 65 °C has a negative impact on the duration of the drying process. In comparison with the regimes of beech lumber drying according to ON 49 0651, carried out at temperatures t = 60 ÷ 80 °C, the duration of drying beech lumber with the thickness h = 40 mm according to the suggested regime is 1.9 times longer, the duration of drying beech lumber with the thickness h = 60 mm is 2.3 times longer and the duration of drying beech lumber with the thickness h = 80 mm is 2.9 times longer. The specifi c heat energy consumption of beech lumber with the initial moisture content Wp = 70 % to the final moisture content Wk = 8 % in a chamber type KWC 121, according to the suggested regimes, is equals to QTZN = 514.46 kWh⋅m-3 for the thickness h = 40 mm, QTZN = 557.62 kWh⋅m-3 for lumber with the thickness h = 60 mm, and QTZN = 643.16 kWh⋅m-3 for lumber with the thickness h = 80 mm. The specifi c heat energy consumption needed for the drying of 1 m3 of beech lumber with the thickness h = 60 mm according to the suggested regime is by 26.89% higher than the specifi c heat energy consumption used to dry beech lumber of the same thickness according to the regime of beech lumber drying by Vzduchotechnika a.s. which does not preserve the natural color of the wood.Ladislav DzurendaNencho DeliiskiUniversity of Zagreb, Faculty of Forestry and Wood Technologyarticlebeech lumberconvective dryingregime of dryingcolor of woodForestrySD1-669.5ENDrvna Industrija, Vol 63, Iss 2, Pp 95-103 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	beech lumber convective drying regime of drying color of wood Forestry SD1-669.5
spellingShingle	beech lumber convective drying regime of drying color of wood Forestry SD1-669.5 Ladislav Dzurenda Nencho Deliiski Convective Drying of Beech Lumber without Color Changes of Wood
description	This paper presents the results of analyzing the influence of suggested regimes of chamber drying of beech lumber with the thickness h = 40 mm, h = 60 mm and h = 80 mm from the initial moisture content Wp = 70 % to the final moisture content Wk = 8 %. The regimes ensure the preservation of the natural color of the wood. The study results show that the drying of beech lumber according to the suggested regimes causes no changes in the chromophoric compounds of the wood and the beech lumber preserves its original white-yellow color. Quality parameters of the dried lumber, such as: difference between the average final moisture content and the required final moisture content, and the range of the final moisture and moisture gradient in dried beech lumber, classify this dried lumber into the first quality class. The suggested regimes for drying beech lumber using hot air in the temperature range ts = 37 ÷ 65 °C has a negative impact on the duration of the drying process. In comparison with the regimes of beech lumber drying according to ON 49 0651, carried out at temperatures t = 60 ÷ 80 °C, the duration of drying beech lumber with the thickness h = 40 mm according to the suggested regime is 1.9 times longer, the duration of drying beech lumber with the thickness h = 60 mm is 2.3 times longer and the duration of drying beech lumber with the thickness h = 80 mm is 2.9 times longer. The specifi c heat energy consumption of beech lumber with the initial moisture content Wp = 70 % to the final moisture content Wk = 8 % in a chamber type KWC 121, according to the suggested regimes, is equals to QTZN = 514.46 kWh⋅m-3 for the thickness h = 40 mm, QTZN = 557.62 kWh⋅m-3 for lumber with the thickness h = 60 mm, and QTZN = 643.16 kWh⋅m-3 for lumber with the thickness h = 80 mm. The specifi c heat energy consumption needed for the drying of 1 m3 of beech lumber with the thickness h = 60 mm according to the suggested regime is by 26.89% higher than the specifi c heat energy consumption used to dry beech lumber of the same thickness according to the regime of beech lumber drying by Vzduchotechnika a.s. which does not preserve the natural color of the wood.
format	article
author	Ladislav Dzurenda Nencho Deliiski
author_facet	Ladislav Dzurenda Nencho Deliiski
author_sort	Ladislav Dzurenda
title	Convective Drying of Beech Lumber without Color Changes of Wood
title_short	Convective Drying of Beech Lumber without Color Changes of Wood
title_full	Convective Drying of Beech Lumber without Color Changes of Wood
title_fullStr	Convective Drying of Beech Lumber without Color Changes of Wood
title_full_unstemmed	Convective Drying of Beech Lumber without Color Changes of Wood
title_sort	convective drying of beech lumber without color changes of wood
publisher	University of Zagreb, Faculty of Forestry and Wood Technology
publishDate	2012
url	https://doaj.org/article/7a4f3882846e4dd68c06fb70980bb108
work_keys_str_mv	AT ladislavdzurenda convectivedryingofbeechlumberwithoutcolorchangesofwood AT nenchodeliiski convectivedryingofbeechlumberwithoutcolorchangesofwood
_version_	1718401736667824128

Convective Drying of Beech Lumber without Color Changes of Wood

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