Novel Dual Walling Cob Building: Dynamic Thermal Performance

This paper emphasizes the experimental and numerical study of new cob mixes used for insulation and load bearing wall elements. The experimental study provides complete datasets of thermal properties of the new walling materials, using cob with density ranging from 1107 kg/m<sup>3</sup>...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Kaoutar Zeghari, Ayoub Gounni, Hasna Louahlia, Michael Marion, Mohamed Boutouil, Steve Goodhew, François Streif
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	earth construction cob-building building performance dynamic simulation heating energy sustainable thermal comfort Technology T
Acceso en línea:	https://doaj.org/article/06ec0f3fb03548e785975eba4bc1a73c
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:06ec0f3fb03548e785975eba4bc1a73c
record_format	dspace
spelling	oai:doaj.org-article:06ec0f3fb03548e785975eba4bc1a73c2021-11-25T17:27:39ZNovel Dual Walling Cob Building: Dynamic Thermal Performance10.3390/en142276631996-1073https://doaj.org/article/06ec0f3fb03548e785975eba4bc1a73c2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7663https://doaj.org/toc/1996-1073This paper emphasizes the experimental and numerical study of new cob mixes used for insulation and load bearing wall elements. The experimental study provides complete datasets of thermal properties of the new walling materials, using cob with density ranging from 1107 kg/m<sup>3</sup> to 1583 kg/m<sup>3</sup> for structural walls and less than 700 kg m<sup>−3</sup> for insulation walls. Various mixes of French soils and fibres (reed, wheat straw, hemp shiv, hemp straw, and flax straw) with different water contents are studied. The lowest average thermal conductivity is obtained for the structural cob mix prepared of 5% wheat straw and 31% of water content. The insulation mix, prepared with 25% reed and 31% water content, has the lowest thermal conductivity. Investigation of diffusivity, density, and heat capacity shows that, when thermal conductivity is lower than 0.4 W m<sup>−1</sup> K<sup>−1</sup>, the decrease in cob density leads to better insulation values and higher heat capacity. Little variation is noticed regarding the density and heat capacity for cob mixes with thermal conductivity higher than 0.4 W m<sup>−1</sup> K<sup>−1</sup>. Furthermore, the non-uniformity of local thermal conductivity and heat losses through the samples is due mainly to the non-uniform distribution of fibres inside the mixes inducing an increase in heat loss up to 50% for structural walls and 25% for insulation walls. Cob thermal properties are used in a comparative simulation case study of a typical house under French and UK climatic conditions. The energy performance of the conventional building is compared to a dual walled cob building, showing remarkable reduction in energy consumption as the cob walls, whilst maintaining comfortable indoor conditions without additional heating.Kaoutar ZeghariAyoub GounniHasna LouahliaMichael MarionMohamed BoutouilSteve GoodhewFrançois StreifMDPI AGarticleearth constructioncob-buildingbuilding performancedynamic simulationheating energysustainable thermal comfortTechnologyTENEnergies, Vol 14, Iss 7663, p 7663 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	earth construction cob-building building performance dynamic simulation heating energy sustainable thermal comfort Technology T
spellingShingle	earth construction cob-building building performance dynamic simulation heating energy sustainable thermal comfort Technology T Kaoutar Zeghari Ayoub Gounni Hasna Louahlia Michael Marion Mohamed Boutouil Steve Goodhew François Streif Novel Dual Walling Cob Building: Dynamic Thermal Performance
description	This paper emphasizes the experimental and numerical study of new cob mixes used for insulation and load bearing wall elements. The experimental study provides complete datasets of thermal properties of the new walling materials, using cob with density ranging from 1107 kg/m<sup>3</sup> to 1583 kg/m<sup>3</sup> for structural walls and less than 700 kg m<sup>−3</sup> for insulation walls. Various mixes of French soils and fibres (reed, wheat straw, hemp shiv, hemp straw, and flax straw) with different water contents are studied. The lowest average thermal conductivity is obtained for the structural cob mix prepared of 5% wheat straw and 31% of water content. The insulation mix, prepared with 25% reed and 31% water content, has the lowest thermal conductivity. Investigation of diffusivity, density, and heat capacity shows that, when thermal conductivity is lower than 0.4 W m<sup>−1</sup> K<sup>−1</sup>, the decrease in cob density leads to better insulation values and higher heat capacity. Little variation is noticed regarding the density and heat capacity for cob mixes with thermal conductivity higher than 0.4 W m<sup>−1</sup> K<sup>−1</sup>. Furthermore, the non-uniformity of local thermal conductivity and heat losses through the samples is due mainly to the non-uniform distribution of fibres inside the mixes inducing an increase in heat loss up to 50% for structural walls and 25% for insulation walls. Cob thermal properties are used in a comparative simulation case study of a typical house under French and UK climatic conditions. The energy performance of the conventional building is compared to a dual walled cob building, showing remarkable reduction in energy consumption as the cob walls, whilst maintaining comfortable indoor conditions without additional heating.
format	article
author	Kaoutar Zeghari Ayoub Gounni Hasna Louahlia Michael Marion Mohamed Boutouil Steve Goodhew François Streif
author_facet	Kaoutar Zeghari Ayoub Gounni Hasna Louahlia Michael Marion Mohamed Boutouil Steve Goodhew François Streif
author_sort	Kaoutar Zeghari
title	Novel Dual Walling Cob Building: Dynamic Thermal Performance
title_short	Novel Dual Walling Cob Building: Dynamic Thermal Performance
title_full	Novel Dual Walling Cob Building: Dynamic Thermal Performance
title_fullStr	Novel Dual Walling Cob Building: Dynamic Thermal Performance
title_full_unstemmed	Novel Dual Walling Cob Building: Dynamic Thermal Performance
title_sort	novel dual walling cob building: dynamic thermal performance
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/06ec0f3fb03548e785975eba4bc1a73c
work_keys_str_mv	AT kaoutarzeghari noveldualwallingcobbuildingdynamicthermalperformance AT ayoubgounni noveldualwallingcobbuildingdynamicthermalperformance AT hasnalouahlia noveldualwallingcobbuildingdynamicthermalperformance AT michaelmarion noveldualwallingcobbuildingdynamicthermalperformance AT mohamedboutouil noveldualwallingcobbuildingdynamicthermalperformance AT stevegoodhew noveldualwallingcobbuildingdynamicthermalperformance AT francoisstreif noveldualwallingcobbuildingdynamicthermalperformance
_version_	1718412328063467520

Novel Dual Walling Cob Building: Dynamic Thermal Performance

Ejemplares similares