Thermal conductivity of different bio-based insulation materials

Medved, Sergej (author), Tudor, Eugenia Mariana (author), Barbu, Marius-Catalin (author), Young, Timothy M. (author)

To achieve the zero-waste goal as well as sustainability, the use of the raw materials, especially those from nature, and wood in particular, has to be smart, meaning that the resource has to be used to its full potential. Since wood-based industry is associated with high intensity and the generation of a relatively large amount of residues, those residues should be used for the production of useful products, otherwise they will easily be classified as waste and afterwards used as a source of energy. To present a possible solution for wood residues like wood chips, wood particles and bark, we investigated the possibility of using wood and bark residues as constituents for the production of single layer insulation panel with a target thickness of 40 mm and target density of 0.2 g·cm-3. Thermal conductivity was determined using the steady state principle at three different temperature settings. The average thermal conductivities were determined between 49 mW·m-1·K-1 and 74 mW·m-1·K-1. The highest values were determined at boards made from bark, which also had the highest density (0,291 g·cm-3), while the lowest thermal conductivity was observed for boards made from spruce wood particles.

• Language: English
• Keywords: thermal conductivity, insulation, wood particles, particleboard, bark
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: Str. 73-82
• Numbering: Let. 70, št. 1
• PID: 20.500.12556/RUL-128617
• UDC: 630*862:630*812.14
• ISSN on article: 0024-1067
• DOI: 10.26614/les-wood.2021.v70n01a05
• COBISS.SI-ID: 70855427
• Publication date in RUL: 21.07.2021

Record is a part of a journal

• Title: Les
• Shortened title: Les
• Publisher: Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze
• ISSN: 0024-1067
• COBISS.SI-ID: 13940224

Secondary language

• Language: Slovenian
• Title: Toplotna prevodnost različnih bio-izolacijskih materialov

Abstract

Doseganje cilja "nič odpadkov" in načela trajnostne rabe je kompleksen proces, ki zahteva učinkovito rabo surovine, še posebej naravne, zlasti lesa. Pomembno je, da je raba surovine celostna, da se uporabi v celoti za izdelavo trajnostnih produktov. Lesnopredelovalna industrija je visoko intenzivna proizvodnja, kar pomeni, da pri tem nastanejo tudi velike količine ostankov, primernih za izdelavo uporabnih proizvodov. V primeru, ko ostankov ne bi smotrno uporabili, pa se to surovino opredeli kot odpadek in uporabi za proizvodnjo energije (kar pa ni najbolj trajnostna in tudi optimalna rešitev). S ciljem predstavitve možne uporabe lesnih ostankov, kot so npr. sekanci, iveri in skorja, smo raziskali možnost njihove uporabe za izdelavo enoslojnih izolacijskih plošč ciljne debeline 40 mm in gostote 0.2 g·cm-3. Toplotno prevodnost smo določili pri treh različnih temperaturnih pogojih. Ugotovljene vrednosti povprečne toplotne prevodnosti so bile med 49 mW·m-1·K-1 in 74 mW·m-1·K-1. Najvišje vrednosti so bile izmerjene pri ploščah iz skorjete so imele tudi najvišjo gostoto (0.291 g·cm-3), najnižje pa so izmerili na ploščah iz smrekovih iveri.

• Keywords: les, toplotna prevodnost, izolativnost, sekanci, iveri, skorja

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0015
• Name: Les in lignocelulozni kompoziti

• Funder: ARRS - Slovenian Research Agency
• Project number: V4-2017
• Name: Izboljšanje konkurenčnosti slovenske gozdno-lesne verige v kontekstu podnebnih sprememb in prehoda v nizko-ogljično družbo