Investigation of the Process of Heat Transfer in the Structure of Thermal Insulation Materials Based on Natural Fibres

Zach, Jiří; Slávik, Richard; Novák, Vítězslav

doi:10.1016/j.proeng.2016.07.389

Cited by 18 publications

(5 citation statements)

References 2 publications

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“…The shells of Brazil nuts consist of the exotesta regions, central mesotesta region, mesotesta vascular region and tegmen that present structures with voids such as long and porous cells, porosities and vascular exchanges [41,42] . These voids can be filled with air and moisture that act as resistance to heat transfer reducing the Cp for composites [43,44] .…”

Section: Resultsmentioning

confidence: 99%

Polymer composite produced with Brazil nut residues and high impact polystyrene

et al. 2022

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Solid residues from agroindustry often accumulate and cause environmental imbalance. An alternative to this is to use this residue as a reinforcement in polymers. The achievement of this work was to characterize a composite with a polystyrene matrix reinforced with Brazil nut shells residues. The residues were cleaned and ground to then produce the samples via injection molding with the proportions of 0%, 2.5% and 5% of load. The specimens were characterized using mechanical tensile testing and thermogravimetric analysis (TGA). The mechanical test showed that the composite with 2.5% of filler had greater stiffness and strength was improved by 5%. Thermal analysis showed an increase in the temperature for the beginning of the degradation of the M2.5 composite. The results confirm a potential application in the automotive industry for the polystyrene composite reinforced with Brazil nut shells.

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Section: Resultsmentioning

confidence: 99%

Polymer composite produced with Brazil nut residues and high impact polystyrene

et al. 2022

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“…In recent work by [19], hemp fibres have been used as natural reinforcements for polyester composites. The work showed that the addition of the hemp fibres in 20% caused significant improvement to the insulation performance of the polyester composites.…”

Section: International Journal Of Polymer Sciencementioning

confidence: 99%

Insulation Characteristics of Sisal Fibre/Epoxy Composites

Shalwan

Alajmi

2017

International Journal of Polymer Science

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Using natural fibres in civil engineering is the aim of many industrial and academics sectors to overcome the impact of synthetic fibres on environments. One of the potential applications of natural fibres composites is to be implemented in insulation components. Thermal behaviour of polymer composites based on natural fibres is recent ongoing research. In this article, thermal characteristics of sisal fibre reinforced epoxy composites are evaluated for treated and untreated fibres considering different volume fractions of 0-30%. The results revealed that the increase in the fibre volume fraction increased the insulation performance of the composites for both treated and untreated fibres. More than 200% insulation rate was achieved at the volume fraction of 20% of treated sisal fibres. Untreated fibres showed about 400% insulation rate; however, it is not recommended to use untreated fibres from mechanical point of view. The results indicated that there is potential of using the developed composites for insulation purposes.

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“…The infiltration also causes increased moisture movement through the wall, which may contribute to water condensation [9,10]. The water present in building structures due to the phenomenon of condensation is an energy carrier and a key factor that decreases the thermal properties of porous materials [11][12][13] but also leads to the mechanical [14,15] and microbiological deterioration of the materials [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Heat Losses Caused by the Temporary Influence of Wind in Timber Frame Walls Insulated with Fibrous Materials

et al. 2020

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The paper presents the results of research concerning three fiber materials—mineral wool, hemp fiber and wood wool—as loose-fill thermal insulation materials. The analysis used the material parameters determined in previous works conducted by the authors, such as thermal conductivity and air permeability in relation to bulk density. These materials exhibit open porosity; thus, convection is an essential phenomenon in the heat transfer process. The paper aimed at conducting thermal simulations of various frame wall variants which were filled with the above-mentioned insulation materials. The simulations were performed with the Control Volume Method using the Delphin 5.8 software. The studies accounted for the effect of wind pressure and the time of its influence on a wall insulated by means of fiber material with a thickness of 150 as well as 250 mm. The simulation enabled us to obtain such data as maximal R-value reduction and time to return to equilibrium after filtration for the analyzed materials. The study proved that heat transfer in these insulations strongly depends on the bulk density, thickness of the insulation and wind pressure. The decrease in R is reduced as the density increases. This results from the decreased air permeability characterizing the material. Wind washing causes lower R reduction than air filtration in all models. The greater the thickness, the longer it takes for the models to return to the equilibrium state following air filtration (and wind washing). This period is comparable for air filtration and wind washing. Hemp fibers were characterized with the strongest susceptibility to air filtration; in the case of wood wool, it was also high, but lower than for hemp fibers, while mineral wool was characterized with the lowest.

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Investigation of the Process of Heat Transfer in the Structure of Thermal Insulation Materials Based on Natural Fibres

Cited by 18 publications

References 2 publications

Polymer composite produced with Brazil nut residues and high impact polystyrene

Polymer composite produced with Brazil nut residues and high impact polystyrene

Insulation Characteristics of Sisal Fibre/Epoxy Composites

Heat Losses Caused by the Temporary Influence of Wind in Timber Frame Walls Insulated with Fibrous Materials

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