Thermal, Moisture and Biological Behaviour of Natural Insulating Materials

Volf, Martin; Diviš, Jakub; Havlík, Filip

doi:10.1016/j.egypro.2015.11.219

Cited by 58 publications

(35 citation statements)

References 3 publications

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“…The conductivity is slightly higher longitudinally than it is in a transverse direction, and these results are aligned with the scientific literature [9]. Since natural fibers consist of crystalline cellulose lattice that are radially arranged around its axis, they are highly anisotropic, which gives less thermal resistance along the axis compared to across the axis [10], [27]. Heat transfer is faster along the grain then across it.…”

Section: The Influence Of Anisotropy On Thermal Conductionsupporting

confidence: 80%

Thermo-physical Properties Measurements of an Insulating Material Extracted from Different Date Palm Trees

Oaddi¹,

Tiskatine²,

Boulaid³

et al. 2019

I2M

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During the last few decades, natural materials appear as a viable solution to current environmental problems and have been of interest to industry and researchers. The aim of this paper is to analyze the thermo-physical properties of a natural material extracted from three varieties of local date palm waste, called petiole, namely Boufeggous, Hafsa and Sair from Tinghir oasis, southern Morocco. A Transient Plane Source (TPS) method was used to measure the thermal conductivity and diffusivity of the proposed materials at different temperatures (40 °C, 60 °C, 80 °C, 100 °C, and 120 °C). The thermo-physical properties, according to the orientation of the fibers at ambient temperature and atmospheric pressure, have been also conducted and analyzed. Furthermore, a scanning microscopy (SEM) analysis of the samples was conducted to characterize the palm microstructure. The results reveal low values of thermal conductivity which were about 0.070 W/m.K. The microstructure analysis indicate that the proposed material is a highly porous and satisfies the thermal requirements of an insulating material. It worth to mention that this material will be used as insulation for a solar box cooker to reduce heat losses and enhance its performance.

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Section: The Influence Of Anisotropy On Thermal Conductionsupporting

confidence: 80%

Thermo-physical Properties Measurements of an Insulating Material Extracted from Different Date Palm Trees

Oaddi¹,

Tiskatine²,

Boulaid³

et al. 2019

I2M

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“…Comparison of wool performances and common insulation materials [9]. Volf et al [10] compared the thermal, moisture and biological performances of some natural insulating materials such as sheep wool, hemp, flax, straw and wood fibers. In detail, thermal capacity, thermal conductivity, volume density and sorption isotherm were evaluated.…”

Section: Physical Properties Of Sheep Woolmentioning

confidence: 99%

“…Table 2. Measured parameters for sheep wool and other natural fibers [10]. Other research works compared the thermal insulating capacity of sheep wool with rock wool [5,11].…”

Section: Physical Properties Of Sheep Woolmentioning

confidence: 99%

“…The most common kind of wool molds that cause allergy and asthma are: Alternaria alternate, Stachybotrys species, Acremonium species, Penicillium (biverticillata), Fusarium species. However, despite high hygroscopicity of sheep wool, laboratory tests showed that mold growth durability and susceptibility of common mold strains is low [10].…”

Section: Critical Analyses On the Reuse Of Sheep Wool Fibers And Futumentioning

confidence: 99%

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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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“…Studies into the use of sustainable/natural insulation materials as a replacement for mineral ones have already developed low environmental impact structures using different types of biomass; these include hemp, sunflower bark, sunflower pith, flax, straw bale, wood fiber and others (Chabriac et al 2016;Liu et al 2017;Volf et al 2015). Another attractive strand is investing on composite materials using recyclable, raw materials with a commercial binder (Binici et al 2016;Yang et al 2003;Yang et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Thermal and acoustic insulation boards from microalgae biomass, poly-β-hydroxybutyrate and glass wool

Ribeiro

Tavella

Santos

et al. 2020

RSD

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Among the many functions that a building material needs to have, its insulation functions stand out. This type of materials acts by decreasing the conduction of heat/sound in to the environment. In this context, bio-insulations have been receiving an increasing attention due to its performance and the use of sustainable/naturals insulation materials. This study was conducted to evaluate the thermal and acoustic performance of bio-based boards made from the biomass of Spirulina, bacterial poly-β-hydroxybutyrate (PHB), and glass wool. The boards were manufactured under heated compression in different proportions: 33.33% glass wool, 33.33% PHB, and 33.33% Spirulina biomass (Board A); 20% glass wool, 40% PHB, and 40% Spirulina (Board B); 40% glass wool, 40% PHB, and 20% Spirulina (Board C); and 40% glass wool, 20% PHB, and 40% Spirulina (Board D). Boards A and B showed lower thermal conductivity (0.09 W m-1 K-1) compared to traditional insulating materials, such as gypsum neat (0.44 W m-1 K-1) and Kaolin insulating firebrick (0.08–0.19 W m-1 K-1). Board D showed the highest sound absorption coefficient of ~1600 Hz compared to other bio-based insulators at the same frequency, such as polypropylene based non-woven fiber and tea-leaf-fiber with the same thickness. For the noise reduction coefficient, board B showed better results than concrete. Thus, boards A and B are suitable as thermal insulators, while boards B and D are suitable as sound insulators. For simultaneous application as a thermal and sound insulator, board B is the best choice among all boards.

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Thermal, Moisture and Biological Behaviour of Natural Insulating Materials

Cited by 58 publications

References 3 publications

Thermo-physical Properties Measurements of an Insulating Material Extracted from Different Date Palm Trees

Thermo-physical Properties Measurements of an Insulating Material Extracted from Different Date Palm Trees

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

Thermal and acoustic insulation boards from microalgae biomass, poly-β-hydroxybutyrate and glass wool

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