A dynamic thermal response on thermal conductivity at different temperature and moisture levels of EPS insulation

Khoukhi, Maatouk; Hassan, Ahmed; Al‐Saadi, Saleh; Abdelbaqi, Shaimaa

doi:10.1016/j.csite.2019.100481

Cited by 33 publications

(12 citation statements)

References 34 publications

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“…In this case, the moisture content increased significantly-for example with the rockwool type of insulation. While this is understandable, for other types of material, such as EPS insulation, the moisture content showed very little difference under conditioned building environments and when assessing the impact of the thermal conductivity under constant and variable temperature with different levels of moisture content [40][41][42][43].…”

Section: Discussion: Challenging the Consensus In Authenticity-based mentioning

confidence: 98%

“…The two building reconstruction scenarios are presented in Table 2. With the use of computer modelling and energy performance simulation methods, the proposal for the historicist reconstruction with replacement construction materials was tested to improve the environmental sustainability dimensions-in this case energy efficiency-by reducing the cooling loads, which was demonstrated through the use of DesignBuilder software [43,44]. In such a case with replacement materials (Table 1, Second Scenario), the specific annual cooling demand was reduced by 21.45% compared to the historicist reconstruction building condition of the restored Khaz'al Diwan (Table 1, First Scenario).…”

Section: Investigating Environmental Sustainability Dimensions In Recmentioning

confidence: 99%

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Heritage Reconstruction Planning, Sustainability Dimensions, and the Case of the Khaz’al Diwan in Kuwait

Sabri

Altan

AlGhareeb³

et al. 2020

Sustainability

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Although attempts for formulating sustainable approaches in heritage management have been ongoing since the 1980s, sustainability dimensions in the context of ‘reconstruction’ have remained an unexplored research area. By investigating the case of the ruined Khaz’al Diwan in Kuwait, an architectural heritage site in the United Nations Educational, Scientific and Cultural Organization (UNESCO) World Heritage (WH) Tentative List, we explore and compare the roles of the ‘cultural continuity’ and ‘environmental protection’ pillars of sustainability in reconstruction planning. By employing rapid ethnographic surveying and case study methods, we first investigate the approach to ‘cultural continuity’ from the State’s stance and through local community perceptions. Albeit with nuances, the surveying revealed a preference for historicist reconstruction. However, the Khaz’al Diwan, like most of the heritage structures in the Gulf region, was originally constructed with coral stone, which is now protected under environmental laws. How feasible is the use of replacement materials in terms of sustainability perspectives that is also acceptable from heritage perspectives? Considering the high cooling loads required in this climatic region, we prioritized the energy performance of the construction materials of the external walls and the roof. Computer simulations based on scenarios testing same-type and replacement construction materials revealed how the latter could be considered as an alternative in a historicist reconstruction. The discussion revolves around the environmental and cultural parameters that are instrumental in reconstruction planning. This ultimately highlights how reconstruction policies must be shaped to redefine the role and scope of material authenticity to accommodate the local environmental and cultural realities in the wider Gulf region and Middle Eastern context.

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Section: Discussion: Challenging the Consensus In Authenticity-based mentioning

confidence: 98%

Section: Investigating Environmental Sustainability Dimensions In Recmentioning

confidence: 99%

Heritage Reconstruction Planning, Sustainability Dimensions, and the Case of the Khaz’al Diwan in Kuwait

Sabri

Altan

AlGhareeb³

et al. 2020

Sustainability

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“…[6]. Organic thermal insulation materials are usually composed of synthetic or natural polymers, Polymers 2021, 13, 258 2 of 11 such as polystyrene (PS) foam [7], polyurethane (PU) foam [8,9], and biomass insulation materials [10]. Most organic materials have better thermal insulation performance than inorganic ones [11] and have advantages of low price, easy preparation, wide applicability, etc.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Thermal Conductivity, and Flame Retardancy of Konjac Glucomannan Based Aerogels

et al. 2021

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With abundant renewable resources and good biodegradability, bio-based aerogels are considered as promising insulating materials for replacing the conventional petroleum-based foam. In this study, konjac glucomannan (KGM)-based aerogels were prepared as thermal insulation materials via a convenient sol–gel and freeze-drying progress with different content of plant polysaccharides, proteins, and wheat straw. The morphology, thermal conductivity, and flame retardancy of KGM-based aerogels were determined. The KGM-based aerogels showed a uniform three-dimensional porous microstructure. The addition of wheat straw could significantly reduce the pore size of aerogels due to its special multi-cavity structure. KGM-based aerogels showed low densities (0.0234–0.0559 g/cm−3), low thermal conductivities (0.04573–0.05127 W/mK), low peak heat release rate (PHRR, 46.7–165.5 W/g), and low total heat release (THR, 5.7–16.2 kJ/g). Compared to the conventional expanded polystyrene (EPS) and polyurethane (PU) foam, the maximum limiting oxygen index (LOI) of KGM-based aerogels increased by 24.09% and 47.59%, the lowest PHRR decreased by 79.37% and 94.26%, and the lowest THR decreased by 76.54% and 89.25%, respectively. The results demonstrated that the KGM-based aerogels had better performance on flame retardancy than PU and EPS, indicating high potential applications as heat insulation in the green advanced engineering field.

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“…These works found that the λ-value of materials for thermal insulation is directly proportional to temperature of the operation; the latter also increases when the former increases [12,13]. Several studies examining the change in the λ values as a function of density, humidity, and operating temperature on the cooling capacity needed by buildings have recently been published [14,15].The effect of moisture content on the thermal conductivity of the insulation material has also been studied by several authors [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Impact of Dynamic Thermal Conductivity Change of EPS Insulation on Temperature Variation through a Wall Assembly

Khoukhi¹

2021

International Conference on Civil, Structural and Transportation Engineering

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This paper evaluates the effect of dynamic thermal conductivity (λ) change of EPS insulation on temperature change through a conventional wall assembly at varying positions of the insulation within the assembly in question. According to the findings, in the case of the application of the variable λ-value of the insulation, compared to that obtained when the constant λ-value for polystyrene (EPS) insulation is adopted in the same conditions, the temperature profile through the wall assembly during the daytime is greater. In the event of applying the constant and variable λvalues, the temperature shift on the inside is seen to decline as the location of the insulation material is positioned towards the surface of the inner wall. These results suggest that considering betterment in the insulation's thermal conductivity would provide the best dynamic thermal efficiency by placing the material in the middle of the wall assembly, taking into account the change in the thermal conductivity of the insulation.

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A dynamic thermal response on thermal conductivity at different temperature and moisture levels of EPS insulation

Cited by 33 publications

References 34 publications

Heritage Reconstruction Planning, Sustainability Dimensions, and the Case of the Khaz’al Diwan in Kuwait

Heritage Reconstruction Planning, Sustainability Dimensions, and the Case of the Khaz’al Diwan in Kuwait

Microstructure, Thermal Conductivity, and Flame Retardancy of Konjac Glucomannan Based Aerogels

Impact of Dynamic Thermal Conductivity Change of EPS Insulation on Temperature Variation through a Wall Assembly

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