Lose Dämmstoffe aus Holz – Wärmeleitfähigkeit von speziell hergestellten Fräßspänen
   ausgewählter Holzarten

Schunk, Christian; Treml, Sebastian; Tröger, F.

doi:10.1007/s00107-009-0354-9

Cited by 2 publications

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“…An interesting phenomenon was observed for insulating materials by Haupl [ 60 ], where the decrease of the thermal conductivity diminishes with decreasing density for very low densities. This phenomenon was observed also in the case of wood-based loose-fill thermal insulation materials [ 61 ], textiles [ 62 ] or hemp fibers [ 63 ].…”

Section: Resultsmentioning

confidence: 76%

Thermophysical Properties of Larch Bark Composite Panels

et al. 2021

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The effects of using 100% larch bark (Larix decidua Mill) as a raw material for composite boards on the thermophysical properties of this innovative material were investigated in this study. Panels made of larch bark with 4–11 mm and 10–30 mm particle size, with ground bark oriented parallel and perpendicular to the panel’s plane at densities varying from 350 to 700 kg/m3 and bonded with urea-formaldehyde adhesive were analyzed for thermal conductivity, thermal resistivity and specific heat capacity. It was determined that there was a highly significant influence of bulk density on the thermal conductivity of all the panels. With an increase in the particle size, both parallel and perpendicular to the panel´s plane direction, the thermal conductivity also increased. The decrease of thermal diffusivity was a consequence of the increasing particle size, mostly in the parallel orientation of the bark particles due to the different pore structures. The specific heat capacity is not statistically significantly dependent on the density, particle size, glue amount and particle orientation.

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Section: Resultsmentioning

confidence: 76%

Thermophysical Properties of Larch Bark Composite Panels

et al. 2021

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“…However, for soft fibreboards and other insulating materials with very low densities, the reduction of the thermal conductivity with decreasing density diminishes, eventually stops and then changes below about 40 kg/m 3 and begins to increase due to cumulative gaseous flow and radiation exchange in the voids (Häupl 2008). This behaviour can also be found for wood-based loose-fill thermal insulation materials (Scheiding 1998;Schunk et al 2009), hemp fibres (Grohe 2004) and textiles (Martin and Lamb 1987;Schardt et al 1993).…”

Section: Introductionmentioning

confidence: 72%

Thermal and moisture flux in soft fibreboards

Sonderegger

Niemz

2010

Eur. J. Wood Prod.

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The thermal conductivity of several wet and dry processed industrial soft fibreboards was determined at temperatures between 10°C and 30°C. Additionally, the thermal conductivity was tested relative to the moisture content ranging from an oven-dry sample to a moisture content of 85% relative humidity. Furthermore, the water vapour diffusion was investigated to determine the resistance factor and the diffusion coefficient under 'dry cup' and 'wet cup' conditions and the sorptions were tested by means of the sorption isotherms.The thermal conductivity increases with increasing temperature at about 0.45% per Kelvin and with increasing moisture at about 0.17 × 10 −2 W/mK per percent volumetric moisture content. Furthermore, the thermal conductivity depends on the manufacture (dry or wet process) and is influenced by density. The water vapour resistance factor increases and the diffusion coefficient decreases with increasing density. Both factors decrease with increasing moisture content and they are dependant on board thickness, composition and manufacturing. The sorption isotherm is similar to solid wood below about 80% relative humidity but strongly increases for soft fibreboards with binding fibres and additives of ammonium phosphate or sodium borate and boric acid when above 80% relative humidity. Wärme-und Feuchteverhalten poröser HolzfaserplattenZusammenfassung An verschiedenen, nach dem Nassoder nach dem Trockenverfahren, industriell hergestellten

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Lose Dämmstoffe aus Holz – Wärmeleitfähigkeit von speziell hergestellten Fräßspänen ausgewählter Holzarten

Cited by 2 publications

References 0 publications

Thermophysical Properties of Larch Bark Composite Panels

Thermophysical Properties of Larch Bark Composite Panels

Thermal and moisture flux in soft fibreboards

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