Metrology of the thermophysical characteristics of building materials: a new experimental device

Douzane, Omar; Langlet, Thierry; Roucoult, Jean

doi:10.1068/htec68

Cited by 3 publications

(3 citation statements)

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“…Previous papers [4,36,37] focus on a periodic method to assess the thermal diffusivity of building materials. The objective of this paper is to show that an experimental device, using the same elements as the means of the standardized guarded hot plate, is suitable for conventional building materials.…”

Section: Introductionmentioning

confidence: 99%

“…With the generation of a periodic signal source, it is demonstrated that the use of fundamental is necessary and sufficient to assess the thermal diffusivity. The thermal model, consisting in solving heat conduction equation, is detailed in [37]. The experimental protocol is briefly presented here, as well as the limitation of the signal processing which is a main step that generated uncertainties.…”

Section: Introductionmentioning

confidence: 99%

“…β Formulation of the thermal model A previous paper [37] presents in detail the procedure used to solve the thermal problem, in finite medium and in steady-state. Equations (2) govern the proposed thermal model, fig.…”

Section: Introductionmentioning

confidence: 99%

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Sensitive analysis of harmonics on the assessment of thermal diffusivity of building materials of a periodic state

Promis¹,

Douzane²,

Ben³

et al. 2018

THERM SCI

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Thermal efficiency of buildings requires a perfect knowledge of the thermal properties of materials which compose building envelope. To this end, the use of reliable testing methods for thermal diffusivity measurements of buildings materials is fundamental. Currently, periodic methods are based on the exploitation of fundamental harmonic, resulting from Fourier series decomposition. The objective of this paper is to demonstrate that fundamental is necessary and sufficient in order to characterize the thermal diffusivity. For those purposes, a sensitive analysis of harmonic contributions from Fourier series is supported by a substantial experimental campaign. Moreover, some dissymmetrical tests were carried out in order to highlight the preponderant influence of fundamental, compared to other harmonics. The analysis of contributions of harmonics shows that the evolution of thermal diffusivity is very slightly dependent on the number of harmonics. Then, the exploitation of fundamental is necessary and sufficient, and the characterization test protocol is validated by experimental results and by the comparison with commonly accepted values for these kinds of materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%