Hygrothermal performance of multilayer straw walls in different climates

Tlaiji, Ghadie; Pennec, Fabienne; Ouldboukhitine, Salah-Eddine; Ibrahim, Mohamad; Biwolé, Pascal Henry

doi:10.1016/j.conbuildmat.2022.126873

Cited by 17 publications

(5 citation statements)

References 22 publications

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“…On the one hand, the literature has shown that the risk for mold growth, visible or not, increases in environments with relative humidity (RH) above 80% [63]. Conversely, significantly lower risk has been found in environments with RH lower than 40% (for example, when working with C. cladosporioides) [64], specifically in materials such as hempcrete and straw [63,65,66]. Thus, correct material selection during the construction phase should reduce the risk.…”

Section: Necessary Steps To Avoid Fungal Growth Problems In Nzebsmentioning

confidence: 99%

Risk of Fungal Growth in Nearly Zero-Energy Buildings (nZEB)

et al. 2023

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Research on nearly zero-energy buildings has addressed mainly the aspects of energy saving or technical and economic optimization, while some studies have been conducted on comfort and indoor air quality. However, the potential problems that may arise in low-energy buildings during the operational phase, and especially the risk of fungal growth, which can deteriorate the indoor environment and pose a health risk to the occupants, are yet to be extensively investigated. The present work intends to analyze previous research on microbial contamination in zero-energy buildings in order to identify the possible risks that may lead to fungal formation and the possible strategies to prevent the proliferation of molds. The methodology is based on a systematic literature review and subsequent critical analysis to outline perspectives on this topic. The main results indicate that high envelope insulation and inadequate ventilation are the leading causes of fungal growth in energy-efficient buildings. The need for more detailed regulation in this area is also highlighted. The study’s outcomes underline the need for more attention to be paid to the design and management of zero-energy buildings, aiming to achieve the reduction in energy demands while ensuring the occupants’ well-being.

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Section: Necessary Steps To Avoid Fungal Growth Problems In Nzebsmentioning

confidence: 99%

Risk of Fungal Growth in Nearly Zero-Energy Buildings (nZEB)

et al. 2023

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“…Kunzel [24] developed, in 1995, a typical model for predicting the simultaneous heat and mass transfer within building components, using relative humidity and temperature as the driving potentials for moisture and heat, respectively. This model has found extensive use among researchers for assessing the hygrothermal behavior of various bio-based building walls [3,25,26]. Subsequently, numerous distinct numerical models have emerged.…”

Section: Coupled Heat and Moisture Transfer: A Literature Reviewmentioning

confidence: 99%

“…Additionally, these materials exhibit the capability to regulate both indoor temperature and relative humidity, providing enhanced hygrothermal comfort for occupants [1]. Notable examples of bio-based construction materials commonly used in this context include hemp [2], straw [3], date palm [4], sunflower [5], and flax [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Hygrothermal Transfer through Bio-Based Materials: An Application to Wood–Cement Walls

Bakkour,

Ouldboukhitine,

Biwole

et al. 2023

Buildings

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In the context of the energy transition, new construction materials are emerging, notably bio-based materials such as wood concrete. This paper investigates the hygrothermal performance of walls constructed with wood–cement concrete. First, the thermal properties of wooden concrete, namely thermal conductivity, effusivity, and diffusivity, are experimentally characterized in both dry and wet conditions. Second, in situ measurements are carried out on a house in Lyon, a city in France, constructed with mono-layered wood–cement walls. This involves monitoring the temperature and relative humidity levels both inside and outside the building, as well as at three distinct positions within the wood walls over a 6-month period (from 20 April 2023 to 20 October 2023). The hygrothermal analysis at the center of the wall reveals that the wood wall effectively moderates fluctuations in the external temperature and relative humidity. Following this, a numerical study is performed to check the reliability of the adopted Reduced Heat, Air, and Mass (HAM) model to reproduce the hygrothermal performance of the wood–cement wall. The results show a strong agreement between the simulated and measured data, confirming the applicability of the ‘Reduced HAM’ model for the prediction of the hygrothermal behavior of wood–cement walls.

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“…Although the thermal insulation mortar used in the tunnels has a much lower thermal conductivity than ordinary concrete [35][36][37][38], it still falls short of commercially available building insulation materials [39,40]. However, building insulation materials are not suitable for underground space projects due to their high combustibility and low strength [41].…”

Section: Prospects Values and Limitationsmentioning

confidence: 99%

Heat Hazard Control in High-Temperature Tunnels: Experimental Study of Coupled Cooling with Ventilation and Partial Insulation for Synergistic Geothermal Extraction

Wang

2023

IJERPH

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The problem of heat hazard in tunnel engineering has seriously affected the normal work of personnel and machinery. After combining the heat hazard control method of controlling the energy source and blocking the energy transfer, a technical scheme of precise thermal insulation at the working face in concert with geothermal energy extraction is proposed, forming a coupled cooling method of ventilation and partial thermal insulation. By building a scaled model test platform, the temperature field of the working area was analyzed, and the effect of factors, such as with or without a thermal insulation layer, ventilation velocity, and surrounding rock temperature on the cooling limit, was discussed. The feasibility of extracting energy and enhancing cooling through the heat exchange layer was judged. The results show that the partial thermal insulation can effectively weaken the heat dissipation of the surrounding rock and enhance the ventilation and cooling effect, which can reduce the average ventilation limit temperature of the working area by 1.6 °C. The addition of the heat exchange layer can further improve the tunnel environment on the basis of partial insulation, making the cooling limit temperature drop by another 3.1 °C, and the heat exchange layer can work for one year to extract geothermal energy 4.5 × 108 J. The coupled cooling scheme of ventilation and partial thermal insulation is practical and useful, which can provide technical ideas for improving the thermal environment of the tunnel.

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Hygrothermal performance of multilayer straw walls in different climates

Cited by 17 publications

References 22 publications

Risk of Fungal Growth in Nearly Zero-Energy Buildings (nZEB)

Risk of Fungal Growth in Nearly Zero-Energy Buildings (nZEB)

Experimental and Numerical Investigation of Hygrothermal Transfer through Bio-Based Materials: An Application to Wood–Cement Walls

Heat Hazard Control in High-Temperature Tunnels: Experimental Study of Coupled Cooling with Ventilation and Partial Insulation for Synergistic Geothermal Extraction

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