Determination of hygrothermal parameters of experimental and commercial bio-based insulation materials

Palumbo, Mariana; Palacio, Ana María Lacasta; Holcroft, Neal; Shea, Andrew; Walker, Pete

doi:10.1016/j.conbuildmat.2016.07.106

Cited by 98 publications

(44 citation statements)

References 25 publications

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“…Measurements with 0%, 50%, and 90% relative humidity (0%, 15%, and 22% water content) showed a significant increase of the conductivity; from 0.064 W/mK for 0% RH to 0.069 W/mK for 22% RH. Palumbo [14] investigated the thermal conductivity of a board composed of barley straw (81%) and corn starch (19%). Observations also lead to a significant linear increase of the thermal conductivity when the relative humidity varied from 10% to 90%.…”

Section: Overview Of Thermal Conductivity Measurements On Straw Balesmentioning

confidence: 99%

Thermal Conductivity of Straw Bales: Full Size Measurements Considering the Direction of the Heat Flow

et al. 2017

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Abstract:The thermal conductivity of straw bales is an intensively discussed topic in the international straw bale community. Straw bales are, by nature, highly heterogeneous and porous. They can have a relatively large range of density and the baling process can influence the way the fibres are organised within the bale. In addition, straw bales have a larger thickness than most of the insulating materials that can be found in the building industry. Measurement apparatus is usually not designed for such thicknesses, and most of the thermal conductivity values that can be found in the literature are defined based on samples in which the straw bales are resized. During this operation, the orientation of the fibres and the density may not be preserved. This paper starts with a literature review of straw bale thermal conductivity measurements and presents a measuring campaign performed with a specific Guarded Hot Plate, designed to measure samples up to 50 cm thick. The influence of the density is discussed thoroughly. Representative values are proposed for a large range of straw bales to support straw-bale development in the building industry.

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Section: Overview Of Thermal Conductivity Measurements On Straw Balesmentioning

confidence: 99%

Thermal Conductivity of Straw Bales: Full Size Measurements Considering the Direction of the Heat Flow

et al. 2017

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“…As the thermal conductivity is higher in water than in wood, there are strong correlations between the moisture content and thermal conductivity as well as the moisture content and air humidity of the wood and wood products. Since EMC decreases, the panel will contain less water under the same conditions; consequently, its thermal conductivity will be lower (Kol -Sefil 2011, Palumbo et al 2016, Pelit et al 2016, Brischke 2017.…”

Section: Resultsmentioning

confidence: 99%

Insulation Panels Made from Thermally Modified Bark

Pásztory

Tsalagkas

Horváth

et al. 2019

Acta Silvatica Et Lignaria Hungarica

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Thermally treated and ground poplar bark was used as the raw material for pressed bark insulation panels. Bark chips were treated for one, two, and three hours at 180 °C after a slow warming, drying process. The physical and mechanical properties of the pressed panels were investigated and compared to each other and to the control panel made of untreated bark chips. Thermal conductivity showed slight deviations and ranged from 0.064 – 0.067 W·m−1·K−1. The MOR and MOE showed a significant increase of 100%. The internal bond increased by 27% while the water absorption and thickness swelling decreased by 53.8% and 69.1% respectively. Panel density did not change significantly because the target density was the same for every panel type. The mechanical and physical properties of thermal insulation panels made of heat-treated chips increased significantly.

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“…The thermal conductivity of sustainable building insulation products have been reviewed and these are being used in a range of applications to achieve energy efficiency targets [21]. The thermal conductivity, thermal diffusivity and water vapour permeability of natural insulators have been reported and sensitivity to humidity is known to reduce the thermal performance [22,23]. The thermal conductivity and mechanical properties of lightweight cementitious materials material containing fibres such as recycled paper mill waste have also been reported [24].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Waste Feathers in the Production of New Thermal Insulation Materials

Dieckmann

Onsiong

Nagy

et al. 2020

Waste Biomass Valor

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Poultry has become the primary source of dietary protein consumed globally and as a result the by-product feathers are an increasingly problematic industrial waste. Developing a circular economy for feathers is, therefore, an important research area that provides an opportunity to make use of the unique combination of properties of this abundant natural material. This paper reports on the thermal properties of novel feather-based thermal insulation materials. Waste feathers were collected, cleaned and processed into fibres, which were then used to form air-laid nonwoven materials. These have a high fibre content and exploit the excellent natural thermal insulation properties of feathers. The performance of the novel materials developed are tested in order to outline the influence of temperature and density on thermal conductivity and dynamic water sorption. Results are compared to a range of commercially available thermal insulation materials for buildings manufactured from denim, hemp, sheep wool, PET and mineral wool. It was found that air laid feather-fibre fabrics have comparable performance to other fibrous materials and have a thermal conductivity of 0.033 W/(m K) for samples with a density of 59 kg/m 3. This is due to the low thermal conductivity of feather fibres and the void structure formed by air-laid processing that effectively traps air. These materials additionally offer improved sustainability credentials as they are derived from a readily available waste that is generally considered to be unavoidable. The paper concludes by highlighting the significant technical and commercial barriers that exist to using waste feathers in thermal insulation products and suggests areas for further research that can exploit the unique properties of feathers.

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Determination of hygrothermal parameters of experimental and commercial bio-based insulation materials

Cited by 98 publications

References 25 publications

Thermal Conductivity of Straw Bales: Full Size Measurements Considering the Direction of the Heat Flow

Thermal Conductivity of Straw Bales: Full Size Measurements Considering the Direction of the Heat Flow

Insulation Panels Made from Thermally Modified Bark

Valorization of Waste Feathers in the Production of New Thermal Insulation Materials

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