A Methodology for Experimental Research of the Freezing Process of Logs

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This paper describes a methodology for experimental research of the change in the temperature and humidity of the air processing medium and also in the temperature at 4 points of the longitudinal section of logs during freezing. The suggested methodology is used to research the change in the mentioned parameters of poplar logs with diameters of 240 mm, lengths of 480 mm and moisture content above the hygroscopic range during 50 h of freezing in a freezer at a temperature of about -30 °C. The automatic measurement and recording of the parameters is carried out with the help of Data Logger type HygrologNT3 produced by the Swiss firm ROTRONIC. The precise instrumentation allowed, for the first time ever, the measuring of the impact the latent heat released by the free water on the log had on the warming up of the wood during water crystallization in the logs.

CHUDINOV, B. S. (1966): Teoreticheskie issledovania teplofizicheskih svoystv i teplovoy obrabotki dreveciny. [Theoretical Research of Thermo-Physical Properties and Thermal Treatment of Wood]. Dissertation for DSc., SibLTI, Krasnoyarsk, USSR (in Russian)

CHUDINOV, B. S. (1968): Teoria teplovoy obrabotki drevesiny [Theory of Thermal Treatment of Wood]. Nauka, Moscow, USSR, 255 p. (in Russian)

DELIISKI, N. (2004): Modelling and Automatic Control of Heat Energy Consumption Required for Thermal Treatment of Logs. Drvna Industrija, 55 (4): 181-199.

DELIISKI, N. (2005) Modeling and Automatic Control of the Process of Thermal Treatment of Logs. Information Technologies and Control, UAI, Sofia, 3 (2): 9-14.

DELIISKI, N. (2009): Computation of the 2-dimensional Transient Temperature Distribution and Heat Energy Consumption of Frozen and Non-Frozen Logs. Wood Research, 54 (3): 67−78.

DELIISKI, N. (2011): Transient Heat Conduction in Capillary Porous Bodies. In Ahsan A. (ed) Convection and Conduction Heat Transfer. InTech Publishing House, Rieka: 149-176, http://dx.doi.org/10.5772/21424

DELIISKI, N. (2013a): Computation of the Wood Thermal Conductivity during Defrosting of the Wood. Wood research, 58 (4): 637-650.

DELIISKI, N. (2013b): Modelling of the Energy Needed for Heating of Capillary Porous Bodies in Frozen and Non-Frozen States. Lambert Academic Publishing, Scholars’ Press, Saarbrucken, Germany, 116 p., http://www.scholars-press.com//system/covergenerator/build/1060

DELIISKI, N., DZURENDA, L. (2010): Modelling of the thermal processes in the technologies for wood thermal treatment. TU Zvolen, Slovakia, 224 p. (in Russian)

DELIISKI, N. - BREZIN, V. - TUMBARKOVA, N. (2014): Modelling of the 2D convective heat exchange between subjected to freezing and to following defrosting logs and the surrounding environment. Annals of Warsaw University of Life Sciences, Forestry and Wood Technology, 86: 67-75.

DELIISKI, N. - BREZIN, V. - TUMBARKOVA, N. (2015a): Modelling of the 1D Convective Heat Exchange Between Logs Subjected to Freezing and to Subsequent Defrosting and the Surrounding Environment. Acta Silvatica et Lignaria Hungarica, 11 (1): 77-88, DOI: 10.1515/aslh-2015-0001 http://aslh.nyme.hu/fileadmin/dokumentumok/fmk/acta_silvatica/cikkek/Vol11-2015/06_deliiski_et_al.pdf

DELIISKI, N. - DZURENDA, L. - TUMBARKOVA, N. - ANGELSKI, D. (2015b): Computation of the Temperature Conductivity of Frozen Wood During its Defrosting. Drvna Industrija, 66 (2): 87-96, http://hrcak.srce/hr/index/php?show=clanak&id_clanak_jezik=207489 doi:

DELIISKI, N. - TUMBARKOVA, N. - DZURENDA, L. - BREZIN, V. (2015c): Computation of the wood thermal conductivity above the hygroscopic range during freezing of the wood. Acta Facultatis Xilologiae, TU-Zvolen, 57 (2): 27-37, ISSN 1336-3824, DOI: 10.17423/afx.2015.57.2.03.

EFIMOV, S. N. (1985): Temperaturnaya zavisimost tepla kristallizacii vody [Temperature Dependence of the Heat of Water Crystallization]. Engineering-Physical Journal of the Institute of Physic- Technical Problems of the Nord, Siberian Department of the Academy of Sciences of USSR, Yakutsk, 49 (4): 658-664 (in Russian)

KHATTABI, A. - STEINHAGEN, H. P. (1992): Numerical Solution to Two-dimensional Heating of Logs. Holz als Roh- und Werkstoff, 50 (7-8): 308-312, http://dx.doi.org/10.1007/BF02615359

KHATTABI, A. - STEINHAGEN, H. P. (1993): Analysis of Transient Non-linear Heat Conduction in Wood Using Finite-difference Solutions. Holz als Roh- und Werkstoff, 51(4): 272-278, http://dx.doi.org/10.1007/BF02629373

KHATTABI, A. - STEINHAGEN, H. P. (1995): Update of “Numerical Solution to Two-dimensional Heating of Logs”. Holz als Roh- und Werkstoff, 53(1): 93-94, http://dx.doi.org/10.1007/BF02716399

PERVAN, S. (2009): Technology for Treatment of Wood with Water Steam. University in Zagreb (in Croatian)

PAHI, S. (2010): Understanding Specific Latent Heat. Lesson 4.3 - Understanding Thermal Latent Heat. Bidang sains dan matematik. https://keterehsky.files.wordpress.com/.../lesson-4.3-understanding-ther

POŽGAJ, A. - CHOVANEC, D. - KURJATKO, S. - BABIAK, M. (1997): Štruktura a vlastnosti dreva [Structure and properties of wood]. 2nd edition, Priroda a.s., Bratislava, 485 p. (in Slovak)

RIVKIN, S. L. - ALEKSANDROV, А. А. (1975): Termodinamicheskie svoystva vody i vodyanogo para [Thermodynamic Properties of Water and Water Steam]. Energia, Moskow, 85 p. (in Russian)

SHUBIN, G. S. (1990): Sushka i teplovaya obrabotka drevesiny [Drying and Thermal Treatment of Wood]. Lesnaya Promyshlennost, Moskow, URSS, 337 p. (in Russian)

SPEARS, J. - ZOLLMAN, D. (1990): Fascination of Physics. Chapter 10: Thermal Energy in Matter. Benjamin/Cummings Publishing Co., 221-224, https://web.phys.ksu.edu/fascination/contents.html

STEINHAGEN, H. P. (1986): Computerized Finite-difference Method to Calculate Transient Heat Conduction with Thawing. Wood Fiber Science, 18 (3): 460-467.

STEINHAGEN, H. P. (1991): Heat Transfer Computation for a Long, Frozen Log Heated in Agitated Water or Steam - A Practical Recipe. Holz als Roh- und Werkstoff, 49 (7-8): 287-290, http://dx.doi.org/10.1007/BF02663790

STEINHAGEN, H. P. - LEE, H.W. (1988): Enthalpy Method to Compute Radial Heating and Thawing of Logs. Wood Fiber Science, 20 (4): 415-421.

STEINHAGEN, H. P. - LEE, H. P. - LOEHNERTZ, S. P. (1987): LOGHEAT: A Computer Program of Determining Log Heating Times for Frozen and Non-Frozen Logs. Forest Products Journal, 37 (11-12): 60-64.

TOPGAARD, D. - SODERMAN, O. (2002): Self-diffusion of nonfreezing water in porous carbohydrate polymer systems studied with nuclear magnetic resonance. Biophysical J. 83: 3596-3606.

TREBULA, P. - KLEMENT, I. (2002): Drying and Hydro-thermal Treatment of Wood. Technical University in Zvolen, Slovakia, 449 p. (in Slovak)

VIDELOV, CH. (2003): Sushene i toplinno obrabotvane na darvesinata [Drying and Thermal Treatment of Wood]. University of Forestry in Sofia, Sofia, 335 p. (in Bulgarian) http:/www.rotronic.com/humidity-measurement-feuchtemessung-temperaturmessung-dataloggers-datenlogger/hygrolog-hl-nt3.html

Acta Silvatica et Lignaria Hungarica

The Journal of University of West Hungary

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CiteScore 2017: 0.22

SCImago Journal Rank (SJR) 2017: 0.136
Source Normalized Impact per Paper (SNIP) 2017: 0.159


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