In-situ measurements of hemp-lime insulation materials for energy efficiency improvement

Šinka, Māris; Bajāre, Diāna; Gendelis, Staņislavs; Jakovičs, Andris

doi:10.1016/j.egypro.2018.07.088

Cited by 15 publications

(6 citation statements)

References 20 publications

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“…Scientific research is currently being conducted on the different natural materials that could be utilized as building materials. The examples include cut sunflower stalk mixed with gypsum binder [2] as insulation board, sisal fibers [3] as scattered reinforcement, flax [4] as an element of chipboards, hemp fibers and shives [5] in mortars, flax or hemp fibers as thermal insulation [6], but also ligneous parts of stalks cut into shives of hemp used as aggregate for the composites based on lime binder [7,8].…”

Section: Introductionmentioning

confidence: 99%

Capillary Uptake Monitoring in Lime-Hemp-Perlite Composite Using the Time Domain Reflectometry Sensing Technique for Moisture Detection in Building Composites

Brzyski

Suchorab

2020

Materials

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The use of waste plants in the production of building materials is consistent with the principles of sustainable development. One of the ideas involves using hemp shives as an aggregate for the production of a composite used as a filling of the timber frame construction of the walls. The most important disadvantage of using the building materials based on organic components is their susceptibility to the water influence. The wall material is exposed to rising groundwater. The research part of the paper presented the preparation method and the investigation of the hemp-perlite-lime composites. Flexural and compressive strength, apparent density, total porosity, thermal conductivity, and mass absorptivity were examined. The main research part pertained to the analysis of capillary uptake occurrence in the composites, being the important phenomenon present in the external walls. The study on this phenomenon was carried out using the technique of indirect moisture evaluation—Time Domain Reflectometry (TDR). The indirect readouts were additionally verified with the traditional evaluation using the gravimetric method based on the PN-EN 1925 standard. The study proved that the tested composites were characterized by low apparent density, thermal conductivity, strength parameters, high total porosity, and mass absorptivity. The partial replacement of hemp shives by expanded perlite had a beneficial effect on the tested properties of composites.

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Section: Introductionmentioning

confidence: 99%

Capillary Uptake Monitoring in Lime-Hemp-Perlite Composite Using the Time Domain Reflectometry Sensing Technique for Moisture Detection in Building Composites

Brzyski

Suchorab

2020

Materials

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“…[12] Palumbo et al [25] evaluated the MBV of four commercially available bio-insulation composite materials and two experimental insulation materials to analyze their performance in maintaining a pleasant indoor environment. The commercially available bio composite insulation materials were hemp-lime, [26] hemp fiber, [27] wood wool (WW), [28] and wood fiber [29] and the remaining experimental insulation materials were barley-straw-starch and corn pith-alginate (CA). MBV and dependence of permeability of water vapor, thermal conductivity, and thermal diffusivity on relative humidity were analyzed.…”

Section: Hygrothermal Performance Of Bio-based Insulation Materialsmentioning

confidence: 99%

A Review of Sustainable Bio‐Based Insulation Materials for Energy‐Efficient Buildings

Raja

Murugan

Ravichandran

et al. 2023

Macro Materials & Eng

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The surge towards a sustainable future in the construction industry requires the use of bio‐based insulation materials as an alternative to conventional ones for improving energy efficiency in structures. In this article, the features of bio‐based insulation materials, including their thermal conductivities, moisture buffering value, fire performance, and life cycle evaluations are examined. It is clear from the review that pre‐ and post‐treatment of the bio‐based materials used for insulation materials optimize their properties. The life cycle analysis reveals a significant reduction in global warming potential (GWP) compared to conventional foams. In addition, it is envisaged that producing bio‐based insulation materials on a larger scale will further decrease the net GWP. The article, therefore, proposes the implementation of policies that will promote the commercialization of bio‐based insulation materials.

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“…Considering these uncertainties, HFM method has been applied to numerous wall types [10][11][12] and U-values could be reasonably estimated with an uncertainty of 10 %. Among the studies, some tested walls are made with hygroscopic building materials [13][14][15][16][17]. In this case, heat transfer is coupled to moisture transfer and latent heat transfer is expected to occur at the surfaces.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental estimation of building wall heat flux in presence of moisture transfer

Assaad,

Colinart,

Lecompte

2023

J. Phys.: Conf. Ser.

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Insulating building envelope is an efficient way to increase building energy efficiency and minimize greenhouse gas emissions related to heating. After building refurbishment, on-site measurements are suitable for verifying the actual thermal transmission properties of plane building components. For instance, the standard ISO 9869-1 describes a HFM method based on the measurement of surface heat flux with heat flow sensor (HFS). This method has been extensively investigated in the literature and successfully applied on vapor tight building walls. Nevertheless, hygroscopic building insulation materials (like biobased materials) are increasingly used, and heat transfer are coupled to moisture transfer within the wall. In this case, the HFS acts as a vapor barrier: it modifies the local moisture transfer and the associated latent heat flux. In this view, this study aims to clarify what it is measured with HFS in presence of moisture transfer. The question is first treated by numerical simulation of heat and moisture transfer within hygroscopic building wall. Then, experiments are carried out on hygroscopic building insulation where the moisture effects are exaggerated.

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In-situ measurements of hemp-lime insulation materials for energy efficiency improvement

Cited by 15 publications

References 20 publications

Capillary Uptake Monitoring in Lime-Hemp-Perlite Composite Using the Time Domain Reflectometry Sensing Technique for Moisture Detection in Building Composites

Capillary Uptake Monitoring in Lime-Hemp-Perlite Composite Using the Time Domain Reflectometry Sensing Technique for Moisture Detection in Building Composites

A Review of Sustainable Bio‐Based Insulation Materials for Energy‐Efficient Buildings

Numerical and experimental estimation of building wall heat flux in presence of moisture transfer

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