Thermal conductivity of wool and wool-hemp insulation

Ye, Z; Wells, CM; Carrington, C. G.; Hewitt, Neil

doi:10.1002/er.1123

Cited by 53 publications

(23 citation statements)

References 9 publications

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“…Moreover, the hygroscopic nature of the wool is able to control the absorbing and release rate of moisture in the environment without affecting the thermal‐insulating properties, thus contributing to improve the indoor comfort, contrarily to other synthetic materials.…”

Section: Resultsmentioning

confidence: 99%

Production and thermomechanical characterization of wool–geopolymer composites

Murri

Landi

2017

J Am Ceram Soc

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Load-bearing and thermal insulating wool waste/geopolymer composites with fireresistant properties were produced and characterized. Two formulations, with different amounts of wool fibers, corresponding in the final composites to about 23 vol% and 31 vol%, were tested. The composites exhibited an average density of 1.0 g/cm 3 , with a thermal conductivity of 0.2 W/mK, and compressive and flexural strength around 9 and 5 MPa, respectively. The flexural strength and fracture behavior were improved by the presence of the fibers, which promoted the onset of a toughening mechanism in the material. Results showed that a geopolymer matrix loaded with 23 vol% of wool fibers is suitable as flame-resistant barrier, as reaction to fire is in class A2 (UNI-EN 13501-1), and as insulating structural partition in buildings because it ensures a consistent load-bearing ability coupled with thermal insulating properties, similarly to other man-made fiber products, with a considerable gain in terms of cost and environmental impact.

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Section: Resultsmentioning

confidence: 99%

Production and thermomechanical characterization of wool–geopolymer composites

Murri

Landi

2017

J Am Ceram Soc

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“…Afterwards, the experimental results were used for numerical validation purposes. Ye et al [184] have also used a GHB apparatus to measure the thermal resistance of sheep-wool insulation and wool-36 hemp mixtures, both in the form of bonded insulation batts. Shea et al [185] claimed that the presentation of robust data regarding the main thermal properties of straw bales are very important for the development of projects employing this natural fiber insulation material.…”

Section: New or Non-conventional Insulation Materialsmentioning

confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

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The experimental characterization of the overall thermal transmittance of homogeneous, moderately-and non-homogeneous walls, windows, and construction elements with innovative materials is very important to predict their thermal performance. It is also important to evaluate if the standard calculation methods to estimate the U-value of new and existing walls can be applied to more complex configurations, since the correct estimation of this value is a critical requirement when performing building energy simulations or energy audit. This paper provides a survey on the main methods to measure the thermal transmittance and thermal behaviour of construction elements, considering laboratory conditions and in-situ non-destructive measurements. Five methods are described: the heat flow meter (HFM); the guarded hot plate (GHP); the hot box (HB), considering the guarded HB (GHB) and the calibrated HB (CHB); and the infrared thermography (IRT). Then, previous studies dedicated to the assessment of the thermal performance of different heavy-and light-weight walls are discussed. Particular attention is devoted to the measurement of the U-value of nonhomogeneous walls, including the effect of thermal bridging caused by steel framing or mortar joints, and the presence of PCMs or new insulation materials in the configuration of the walls. hot box; calibrated hot box; infrared thermography. Highlights: -Review on the main methods to measure the U-value of non-homogeneous walls. -Methods: heat flow meter, guarded hot plate, guarded and calibrated hot box, infrared thermography. -Standards framework and discussion of the main advantages and drawbacks of each method. -Description of methodologies and working principles of laboratory and in-situ measurements. -Measurement of the thermal transmittance of different heavy-and light-weight walls.

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“…This is in accordance with results achieved in a study carried out in New Zealand and Northern Ireland that investigated the insulation performances of some sheep wool panels. Results showed that if wool density is more than 11 kg/m 3 [12], thermal resistance is strictly correlated with panel thickness.…”

Section: Physical Properties Of Sheep Woolmentioning

confidence: 96%

Organized Framework of Main Possible Applications of Sheep Wool Fibers in Building Components

Parlato

Porto

2020

Sustainability

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Greasy sheep wool is currently considered a special waste for its high bacterial load, with expensive disposal costs for sheep breeders. For this reason, wool is often burned or buried, with serious consequences for the environment. On the other hand, sheep wool is well regarded as one of the most performative insulating natural fibers due to its thermo-hygrometric and acoustic properties. In the building sector, sheep wool meets the requirements of green building components because it is an eco-friendly material, there is a surplus of it, it is annually renewable, and totally recyclable. If used instead of common insulation materials (e.g., fiberglass, rock wool, polyurethane foam, polystyrene), sheep wool offers significant benefits for sustainability such as a reduction in the production costs for new insulating materials and in environmental pollution. Mechanical and physical properties of sheep wool investigated in previous studies were assessed and discussed with the aim of providing an organized framework of possible applications of wool fibers in building components. This paper highlights in detail aspects that have not yet been investigated enough to detect new potential uses of sheep wool fibers in rural buildings and the reuse of traditional ones.

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Thermal conductivity of wool and wool-hemp insulation

Cited by 53 publications

References 9 publications

Production and thermomechanical characterization of wool–geopolymer composites

Production and thermomechanical characterization of wool–geopolymer composites

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Organized Framework of Main Possible Applications of Sheep Wool Fibers in Building Components

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