Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A Simulation Study Of The Heat Balance Of Concrete Pits During Boiling Of Non-Frozen Logs
University of Forestry, 10 Kliment Ohridski Blvd, 1797 Sofia, Bulgaria.
Technical University in Zvolen, 24 T. G. Masaryka, 960 53 Zvolen, Slovakia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. ETH Zürich, Institut für Baustoffe, Stefano-Franscini-Platz 3, CH 8093 Zürich, Switzerland.ORCID iD: 0000-0001-7722-2814
Transilvania University of Brasov, Universității street no. 1, Brasov, Romania.
Show others and affiliations
2023 (English)In: Bulletin of the Transilvania University of Brasov, Series II: Forestry, Wood Industry, Agricultural Food Engineering, ISSN 2065-2135, Vol. 16(65), no 3 Special Issue, p. 67-82Article in journal (Refereed) Published
Abstract [en]

This paper presents an approach for computing the heat balance of boiling pits during plasticising of non-frozen logs intended for the production of peeled veneer. With the help of our own non-stationary model, the heating times of beech logs with a diameter of 0.4 m, an initial temperature of 10°C, and a moisture content of 0.6 kg∙kg-1 were determined at water temperatures in the pit equal to 70, 80, and 90°C. Using the determined logs’ boiling durations and the mentioned approach, the change in the total energy required to carry out the entire boiling process and that required for each of the individual components of the heat balance was calculated. Computer simulations were conducted for a concrete pit with overall dimensions of 8.0 × 2.6 x 2.5 m, working volume of 20 m3, and a degree of filling with logs equal to 45, 60, and 75%. It was found that the increase in the water temperature from 70 to 90°C causes an increase in the total specific energy, as well as in the energy for the heating of the logs themselves, the construction and the water of the pit. At the same time, the energy required to cover the heat losses of the pit decreases and the energy for heating the metal heater/radiator itself does not change. A decrease in the degree of filling of the pit with logs from 75 to 45% causes an increase in both the total energy and all its components except the energy for heating the logs, which remains unchanged.

Place, publisher, year, edition, pages
Transilvania University Press , 2023. Vol. 16(65), no 3 Special Issue, p. 67-82
Keywords [en]
beech logs, boiling pits, heat balance, plasticising, simulation study, veneer production
National Category
Energy Engineering
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-104900DOI: 10.31926/BUT.FWIAFE.2023.16.65.3.5Scopus ID: 2-s2.0-85188171613OAI: oai:DiVA.org:ltu-104900DiVA, id: diva2:1846994
Note

Godkänd;2024;Nivå 0;2024-04-05 (marisr)

Available from: 2024-03-26 Created: 2024-03-26 Last updated: 2024-04-05Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Niemz, Peter

Search in DiVA

By author/editor
Niemz, Peter
By organisation
Wood Science and Engineering
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 22 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf