A structural wall incorporating biosourced earth for summer thermal comfort improvement: Hygrothermal characterization and building simulation using calibrated PMV-PPD model

Charai, Mouatassim; Mezrhab, Ahmed; Moga, Ligia

doi:10.1016/j.buildenv.2022.108842

Cited by 27 publications

(10 citation statements)

References 57 publications

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“…The hygrothermal characterization of biobased materials has recently received additional research attention. These studies generally focused on the analysis of heat and moisture storage properties and heat and water transfer properties [14][15][16]. Colinart et al [17] focused on the hygrothermal properties of light-earth building materials made of hemp shiv and earth slip.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Moisture Migration in Earth and Fiber Mixtures for Cob Materials

Taouirte,

Tiffonnet,

Marion

et al. 2023

Energies

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This paper highlights the impact of environmental conditions on cob buildings. Different factors such as wall thickness, material permeability and interactions between moisture and heat fluxes can all have significant effects on the performance and durability of cob buildings. An experimental and modeling-based study was conducted on the hygrothermal characterization of cob building materials, which were obtained by mixing earth and fibers. Two types of cob materials that can be used as insulation and to form structural materials in buildings were tested. The effect of outside temperature on adsorption isotherms was investigated for both materials. The experimental data were fitted using the GAB model, after which a new correlation of water content correlation was proposed. Three specific configurations were investigated in which cob material was subjected to moisture transfer and a zero, positive or negative temperature gradient. Based on the resulting measurements, a high coupling effect between heat and moisture transfer inside the structural material was analyzed. A comparison of the experimental and modeling results demonstrated the satisfactory correlation and reliability of the developed model. Simulations were carried out for various wall thicknesses, in order to assess the effect of heat and moisture transfer on water content. The three scenarios were simulated and distributions of water content inside the walls were determined. The results show that the wall thickness of cob buildings and the direction of heat and moisture fluxes affect water content distribution in the structure. A greater thickness of the cob wall leads to higher water content, but this relationship reverses when the heat and moisture fluxes move in the same direction.

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Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Moisture Migration in Earth and Fiber Mixtures for Cob Materials

Taouirte,

Tiffonnet,

Marion

et al. 2023

Energies

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“…The prevalent bioadditives commonly employed include hemp [37][38][39][40][41][42][43][44], wheat [10,41,[45][46][47][48][49], and barley [10,35,[50][51][52]. Additionally, alternative bioadditives encountered in various studies encompass reed [37,41,[53][54][55], olive [56][57][58], rice [53,59], straw [37,[60][61][62][63], flax [31,47,54,64], bagasse [59], corn [51], alfa [65,66], hibiscus cannabinus [67], kenaf [68], lavender [50], palm [69], pennisetum setaceum [70], pumice [43]…”

Section: Comprehensive Analysis Of Studies Investigating the Hygrothe...mentioning

confidence: 99%

Hygrothermal Optimization for Excavated Soil Reuse in Various Climate Buildings: A Global Literature Meta-Analysis

Fogue Djombou,

Gorra,

Malet-Damour

2024

Recycling

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This article investigates the hygrothermal properties of earth-based materials by analyzing experimental data from 88 articles spanning 32 countries worldwide. The focus is determining effective techniques for leveraging the use of excavated soil in construction, particularly emphasizing enhancement of hygrothermal comfort in specific climates. Based on statistical analysis, the study presents a comprehensive classification of earth production techniques, incorporating additives, and examines their impacts on hygrothermal properties of excavated soils. Additionally, it explores the intricate relationship between the climatic conditions of a region and the chosen earth-material production techniques. The analysis aims to propose standard parameters for earthen materials and identify gaps in both methods and experimental studies. Therefore, this study will provide valuable insights by proposing new design tools (ternary diagrams) to maximize the use of excavated soils in construction practices. The proposed diagrams illustrate the intricate relation linking either hygrothermal properties, the climate zone, and manufacturing techniques, or the relation between the most studied manufacturing techniques (compaction, fibered, and stabilization) and expected dry thermal conductivity. Thereby, results from this meta-analysis and critical review will contribute to advancing sustainable construction practices.

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“…The walls of these buildings are made of unsintered soil mixed with sandy clay at a certain proportion [19]. This type of wall preserves heat and features good moisture buffering abilities [20,21]. Most houses in the area are one-story bungalows, with tiles and other decorations on the walls.…”

Section: Study Of the Current Situationmentioning

confidence: 99%

Thermal Comfort Comparison and Cause Analysis of Low-Temperature High-Humidity Indoor Environments of Rural Houses in Gansu Province, China

Li,

Wu,

Chow

et al. 2023

Sustainability

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Low temperatures and high humidity often occur in the northern basins and mountainous regions of China. This research reveals a common winter indoor environment in this rural areas characterized by low-temperature and high-humidity indoor thermal conditions. Improving this environment directly with equipment would inevitably result in significant energy consumption. Therefore, comprehending the thermal performance mechanisms of different structural building materials is of vital importance as it provides crucial baseline values for environmental improvement. This study conducted a survey utilizing user questionnaires, resulting in the collection of 214 valid responses. Additionally, a local experiment regarding thermal comfort was conducted. Simultaneously, this study monitored the indoor physical environments of these houses (a sample of 10 rooms was taken from earth houses and 12 rooms from brick houses). Parameters measured on site included air temperature, relative humidity, light illumination, and CO2. The results showed that the humidity inside the earth houses is more stable and regression models can be developed between thermal sensations and temperature for long-term residents. The residents of these earth houses are more sensitive to temperature step. In contrast, the residents of brick houses, experiencing greater environmental variability, demonstrated lower sensitivity and greater adaptability to temperature changes. In addition, heating from bottom to top is more comfortable and healthier for the residents of brick houses in Gansu. Moreover, it is more favorable for the inhabitants’ livelihood to regulate the temperature steps to a maximum of 4 °C. This study provides valuable reference information for the future design of houses in low-temperature and high-humidity environments.

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A structural wall incorporating biosourced earth for summer thermal comfort improvement: Hygrothermal characterization and building simulation using calibrated PMV-PPD model

Cited by 27 publications

References 57 publications

Effect of Temperature on Moisture Migration in Earth and Fiber Mixtures for Cob Materials

Effect of Temperature on Moisture Migration in Earth and Fiber Mixtures for Cob Materials

Hygrothermal Optimization for Excavated Soil Reuse in Various Climate Buildings: A Global Literature Meta-Analysis

Thermal Comfort Comparison and Cause Analysis of Low-Temperature High-Humidity Indoor Environments of Rural Houses in Gansu Province, China

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