Building materials thermal conductivity measurement and correlation with heat flow meter, laser flash analysis and TCi

Cha, Junghoon; Seo, Jungki; Kim, Sumin

doi:10.1007/s10973-011-1760-x

Cited by 119 publications

(45 citation statements)

References 4 publications

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“…The TCi is a device for conveniently measuring the thermal conductivity of a small sample by using the Modified Transient Plane Source (MTPS) method. It is the advantage of the TCi that can measure the thermal conductivity of materials in the states of solid, liquid, powder, and mixed [27].…”

Section: Characterization Techniquesmentioning

confidence: 99%

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

et al. 2016

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Phase change materials (PCMs) have been used in various fields including the materials of buildings. In this research, mixed shape-stabilized PCMs (Mixed SSPCMs) were prepared by impregnating coconut oil and n-hexadecane into exfoliated graphite nanoplatelets (xGnP) through a vacuum impregnate method. Coconut oil is fatty acid ester PCM which is relatively economical in comparison to other PCMs, and n-hexadecane is paraffin PCM that has high latent heat capacity. Drawbacks include leakage in a liquid state and low thermal conductivity resolved by xGnP. When preparing Mixed SSPCMs, coconut oil and n-hexadecane were impregnated at different proportions, namely 70:30, 50:50, 30:70 wt %. Mixed SSPCMs were analyzed through SEM, FT-IR, DSC, TGA and TCi. As a result, we confirmed the microstructure, chemical stability, thermal properties, thermal stability and thermal conductivity of Mixed SSPCMs. Latent heat capacity of Mixed SSPCMs were 89.06, 104.30 and 124.50 J/g while those of SSPCMs containing single PCM were 82.34 and 96.40 J/g. Thermal conductivity of Mixed SSPCMs was more than 284% higher than that of pure coconut oil and n-hexadecane. Finally, we confirmed that coconut oil and n-hexadecane were impregnated into xGnP, and the Mixed SSPCMs have high thermal durability.

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Section: Characterization Techniquesmentioning

confidence: 99%

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

et al. 2016

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“…By comparison, the axial and tangential/radial direction has the highest mean TC of 0.0665 W/mK, which may be due to fibril alignment, air pockets, glue interference, and/or poor lamination between lumber, as evident in the end-grain sample results. Cha et al (2012) Insulation corkboard 0.045 Matias et al (1997) Plaster board 0.111 Cha et al (2012) Plywood 0.118 Cha et al (2012) Table 7 is a list of published TC values of various materials. Expanded polystyrene has the lowest TC value, making it a highly desirable insulation material.…”

Section: Resultsmentioning

confidence: 99%

Thermal Conductivity of Papua New Guinea Balsa Wood Measured using the Needle Probe Procedure

Kotlarewski¹,

Ozarska²,

Gusamo³

2014

BioResources

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A study was undertaken with the aim to determine thermal properties of balsa wood grown in plantations in Papua New Guinea. Thermal conductivity values were measured using the needle probe procedure according to ASTM D5334 (2008). The mean thermal conductivity results of balsa were in the range of 0.0381 W/mK to 0.0665 W/mK, similar to other materials currently used as insulators in the construction industry. A balsa sample with a density of 113 kg m 3 had the lowest thermal conductivity value, 0.0339 W/mK, across the tangential and radial wood grain directions. Balsa is exported from Papua New Guinea mostly as endgrain panels to international markets to optimise its strength properties in the axial direction for applications that are exposed to compressive forces. This study revealed that there is the opportunity for Papua New Guinea balsa processors to consider producing perpendicular-grain panels for insulation markets, as the mean thermal conductivity values in this direction can be as low as 0.0381 W/mK, which is much lower than the thermal conductivity of the current end-grain panels at 0.0665 W/mK. The finding creates a potential design opportunity for balsa processors to consider entering new commercial markets to promote Papua New Guinea-grown balsa.

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“…There are several well-established methods for measuring thermal conductivity of insulation materials [39,40], but only a few of these methods are capable of conducting measurements at temperatures greater than 1273 K [21,41,42]. Generally, test methods are based on either transient or steady-state measurements.…”

Section: Test Methodsmentioning

confidence: 99%

Thermal conductivity of refractory glass fibres

Modarresifar

Bingham

Jubb

2016

J Therm Anal Calorim

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In the present study, the current international standards and corresponding apparatus for measuring the thermal conductivity of refractory glass fibre products have been reviewed. Refractory glass fibres are normally produced in the form of low-density needled mats. A major issue with thermal conductivity measurements of these materials is lack of reproducibility in the test results due to transformation of the test material during the test. Also needled mats are inherently inhomogeneous, and this poses additional problems. To be able to compare the various methods of thermal conductivity measurement, a refractory reference material was designed which is capable of withstanding maximum test temperatures (1673 K) with minimum transformation. The thermal conductivity of this reference material was then measured using various methods according to the different standards surveyed. In order to compare different materials, samples have been acquired from major refractory glass fibre manufacturers and the results have been compared against the newly introduced reference material. Materials manufactured by melt spinning, melt blowing and sol-gel have been studied, and results compared with literature values.

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Building materials thermal conductivity measurement and correlation with heat flow meter, laser flash analysis and TCi

Cited by 119 publications

References 4 publications

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

Thermal Conductivity of Papua New Guinea Balsa Wood Measured using the Needle Probe Procedure

Thermal conductivity of refractory glass fibres

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