Evaluation of relationships between particle orientation and thermal conductivity in bark insulation board by means of CT and discrete modeling

Kain, Günther; Lienbacher, Bernhard; Barbu, Marius Cătălin; Plank, Bernhard; Richter, Klaus; Petutschnigg, Alexander

doi:10.1016/j.csndt.2016.03.002

Cited by 17 publications

(12 citation statements)

References 13 publications

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“…This finding can be explained by the theory of optimal heat conduction pathways (Carson et al 2005), according to that vertical particles form conduits for the heat energy flow, which results in a higher TC. Other investigations confirmed this coherence for bark particleboard (Kain et al 2016b), wood fibre boards and wood composites in general (Joščák et al 2012).…”

Section: Discussionsupporting

confidence: 64%

“…The thermal conductivity of bark boards with particles aligned horizontally to panel plane is on average 13% lower than with orthogonally oriented particles (Kain et al 2016b). The mechanical properties of wood composites can be influenced by a targeted particle orientation as well.…”

Section: Introductionmentioning

confidence: 99%

“…To bind these particles, 8-10% UF or tannin resin is used. The orientation of particles is a key design parameter regarding a panel's TC (Kain et al 2016b).…”

Section: Introductionmentioning

confidence: 99%

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Larch (Larix decidua) bark insulation board: interactions of particle orientation, physical–mechanical and thermal properties

et al. 2017

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The current trend for sustainable utilisation of limited resources is stimulating the scientific research for previously neglected raw materials that could also be used for new value added products. Bark, which is a natural insulation material of trees, could be used as technical insulation material. This paper focuses on the effects of particle orientation in light larch (Larix decidua) bark insulation boards on their physical-mechanical and thermal properties. The experimental design is based on the variation of the particle orientation (orthogonal or parallel to the panel plane) and the board density (200-500 kg/ m 3 ). The mechanical properties, water absorption, thickness swelling and thermal conductivity of the boards were tested. The results showed a significant influence of the particle orientation and the density on the measured properties of the bark panels. This implies that the bark particle orientation is an important factor when producing insulation panels with specific characteristics. Suggestions for efficient use of bark particleboard are given.

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Section: Discussionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Larch (Larix decidua) bark insulation board: interactions of particle orientation, physical–mechanical and thermal properties

et al. 2017

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“…Tree bark is a highly heterogeneous material, consisting of various material phases which hinder its technical workability. Nevertheless, the multiphase character of bark displays potential for panel optimization [ 15 ], due to characteristics such as steered particle orientation [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Bark Thermal Insulation Panels: An Explorative Study on the Effects of Bark Species

2020

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Tree bark is a byproduct of the timber industry which accrues in large amounts, because approximately 10% of the volume a log is bark. Bark is used primarily for low-value applications such as fuel or as a soil covering material in agriculture. Within the present study, thermal insulation panels made from larch, pine, spruce, fir and oak tree bark with different resins (urea formaldehyde, melamine formaldehyde, Quebracho, Mimosa) as a binder are discussed. Also, the properties of panels made from larch bark mixed with industrial popcorn are investigated. The physical-mechanical properties of the panels, which are dependent on panel density, bark species, resin type, resin content and particle size, are analyzed. The bark species has a minor effect on the mechanical characteristics of the panels, while the compression ratio is important for the panel strength, and hence, barks with lower bulk density are preferable. Under laboratory conditions, panels made with green tannin resins proved to have adequate properties for practical use. The addition of popcorn is a means to lower the panel density, but the water absorption of such panels is comparably high. The bark type has a minor effect on the thermal conductivity of the panels; rather, this parameter is predominantly affected by the panel density.

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“…It is shown that due to the estimated optimal ratios it is possible to adjust the content of the components to ensure the thermal insulation process. In addition, knowledge about permanent panels, understanding of non-uniform boards are improved due to the identification of two major components [13]. This is knowledge of the internal microestructure of the bark board, which allowed creating a numerical model of thermal conductivity based on finite difference methods.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determination of thermal and physical characteristics of dead pine wood thermal insulation products

Tsapko

Zavialov

Bondarenko

et al. 2019

EEJET

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Проведеними дослiдженнями отримано можливiсть виготовлення теплоiзоляцiйних матерiалiв з сухостiйної деревини сосни для облаштування примiщень. Сировиною для їхнього виробництва є деревнi волокна, якi формують у плоскi плити. Встановлено механiзми процесу теплоiзоляцiї при передаваннi енергiї через матерiал, що дає можливiсть впливати на цей процес. Доведено, що процеси теплоiзоляцiї полягають у зниженнi пористостi матерiалу. Так, зi зменшенням об'ємної маси матерiалу, теплопровiднiсть зменшується, i навпаки. Проведено моделювання процесу передавання тепла при спучуваннi вогнезахисного покриття, визначено залежностi теплофiзичних коефiцiєнтiв вiд температури. За отриманими залежностями розраховано коефiцiєнт теплопровiдностi для виробiв з сухостiйної деревини сосни, який сягає 0,132 Вт/(м•K). У разi оброблення виробiв з деревини клейовою композицiєю зменшується до 0,121 Вт/(м•K), а при створеннi теплоiзолювальних плит iз деревної шерстi знижується до 0,079 Вт/(м•K) вiдповiдно. Особливостi гальмування процесу передавання тепла до матерiалу, що виготовлений з деревної шерстi i клеєного в'яжучого, пов'язано з утворенням пор. Це пояснюється тим, що в не великих порах вiдсутнiй рух повiтря, що супроводжується перенесенням тепла. Теплопровiднiсть однорiдного матерiалу залежить вiд об'ємної маси. Так, зi зменшенням об'ємної маси матерiалу до 183 кг/м 3 теплопровiднiсть зменшується в 1,67 рази, i навпаки при застосуваннi дошки теплопровiднiсть знижується лише в 1,1 рази. Це дозволяє стверджувати про вiдповiднiсть виявленого реальному механiзму теплоiзолювання i виявлених умов формування властивостей матерiалу на основi деревної шерстi i неорганiчного та органо-мiнерального в'яжучого та практичну привабливiсть запропонованих технологiчних рiшень, а саме застосування низькоякiсної деревини. Останнi, зокрема, стосуються визначення кiлькостi складової в'яжучого. Таким чином, є пiдстави стверджувати про можливiсть спрямованого регулювання процесiв формування деревинних теплоiзоляцiйних матерiалiв шляхом використання деревної шерстi i неорганiчного та органо-мiнерального в'яжучого, якi здатнi утворювати на поверхнi матерiалу вогнезахисну плiвку Ключовi слова: теплоiзоляцiйнi матерiали, деревна шерсть, теплопровiднiсть, теплоємнiсть, неорганiчне i органо-мiнеральне в'яжуче

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Evaluation of relationships between particle orientation and thermal conductivity in bark insulation board by means of CT and discrete modeling

Cited by 17 publications

References 13 publications

Larch (Larix decidua) bark insulation board: interactions of particle orientation, physical–mechanical and thermal properties

Larch (Larix decidua) bark insulation board: interactions of particle orientation, physical–mechanical and thermal properties

Bark Thermal Insulation Panels: An Explorative Study on the Effects of Bark Species

Determination of thermal and physical characteristics of dead pine wood thermal insulation products

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