Effects of moisture content on thermal conductivity of thermal insulation materials

Gusyachkin, A. M.; Sabitov, Linar; Khakimova, A. M.; Hayrullin, A R

doi:10.1088/1757-899x/570/1/012029

Cited by 16 publications

(9 citation statements)

References 11 publications

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“…The highly hydrophobic characteristics of PiNFAs allow them to resist moisture, a crucial property of thermal insulation materials. The increase in their moisture content leads to higher thermal conductivity due to accelerated heat transfer by conduction, which negates the benefit of insulation. ,− …”

Section: Resultsmentioning

confidence: 99%

Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Thi Khuat,

Doan,

Phong Vo

et al. 2023

ACS Appl. Polym. Mater.

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Due to their low bulk density, high porosity, and functional performance, aerogels are ideal candidates for a variety of applications. However, their potential application in a variety of fields is limited by their time-consuming and costly complex fabrication process. In this study, electrospun 3-aminopropyltriethoxysilane-grafted polyimide (PI@APTES) nanofibers were used to construct nanofibrous aerogels (NFAs) via freeze-drying a dispersion of cross-linked-PI short fibers and a binder (PI@APTES), resulting in improved properties and functionalities. A highly siloxane cross-linked network structure was formed by hydrolysis and condensation reactions to generate stable nanofibrous aerogels. The obtained polyimide nanofibrous aerogels (PiNFAs) had a hierarchically three-dimensional (3D) microporous structure, high porosity (over 98%), tunable densities (10.6 ± 0.7–13.6 ± 0.2 mg cm–3), solvent resistance, superhydrophobicity (water contact angle over 163°), low thermal conductivity (as low as 33.2 mW m–1 K–1), and mechanical stability. These PiNFAs are promising candidates for potential applications in thermal insulation, lightweight construction, filtration, and sensors.

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Section: Resultsmentioning

confidence: 99%

Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Thi Khuat,

Doan,

Phong Vo

et al. 2023

ACS Appl. Polym. Mater.

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“…Back to Table 1, it is plausible that the cooked rice has the highest thermal conductivity among the samples. The increased quantity of water gives higher thermal conductivity of moisture rich in the sample composition [17] [18]. Since the R square is not so close to 1, more detail measurement data are needed to obtain linear relation between the thermal conductivity and moisture content.…”

Section: Resultsmentioning

confidence: 99%

Study on designing measurement system of thermal conductivity based on one-dimensional steady-state method

Amdani,

Harto,

Amri

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Thermal conductivity has wide application in various fields such as in agricultural and food sectors. In a food industry, measuring the thermal conductivity is designed to optimize the thermal process such as drying, sterilization, and freezing. In this study, a system to measure thermal conductivity is designed according to one-dimensional steady state method through Fourier formula. The experiment uses samples consisting of rice-based product (rice grain, rice powder, rice flour, cooked rice) and whole milk powder. The analysis will be performed in the range of 15-30 minutes on its steady condition. The results are verified with the literature data and evaluated through degree equivalence calculation. As a result, the system can distinguish the samples which has different texture and composition. Furthermore, the system can figure the increasing trend of thermal conductivity with the raise of moisture content. However, in most case, thermal conductivities of the measured samples have higher value compared to the literature data (2-4 times higher). The disparity due to the variation of heating temperature, sample condition, measurement technique, and analysis. Several finding to gain more reliable system can be done by improving the insulation or evaluating the mathematical calculation into a two-dimension approximation. In general, the design of the system is plausible for measuring the thermal conductivity.

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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 provision of energy saving solutions and strategies for heritage buildings, for better environmental protection, has begun to receive wider attention, particularly since the 2010s [37][38][39][40][41][42]. Reducing energy consumption is an especially important challenge in the Gulf's climatic conditions.…”

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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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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Effects of moisture content on thermal conductivity of thermal insulation materials

Cited by 16 publications

References 11 publications

Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Study on designing measurement system of thermal conductivity based on one-dimensional steady-state method

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

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