Thermophysical property measurements of building materials in a periodic state

Douzane, Omar; Roucoult, Jean-Marc; Langlet, Thierry

doi:10.1016/s0017-9310(99)00076-9

Cited by 3 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A first set of tests was performed with thermostated baths temperature regulated at 15 °C. These tests lead to the establishment of an optimal period of each material, regarding the assessment of parameter η by damping, η Λ , and phase shift, η Γ [4]. Results of these tests and the deviation obtained for η are summarized in tab.…”

Section: Resultsmentioning

confidence: 99%

“…(5) are solved by dichotomy; an optimum accuracy is reached for 2.0 < η < 3.5, where the curves of damping, Λ(η), and phase shift, Γ(η), are quasilinear. More information are given by [4].…”

Section: Test Parametersmentioning

confidence: 99%

“…Nevertheless, all these methods consist in exciting a sample by absorption of a signal source and in quantifying the thermal response on the surface of the sample (variation of temperature through space and time). Signal source can be of different kinds: -Periodic: conventional methods involve the heating of the sample with a sinusoidal signal [4][5][6][7]. Photoacoustic methods consist in the generation of a sinusoidal signal with a mi---------------THERMAL SCIENCE: Year 2018, Vol.…”

Section: Introductionmentioning

confidence: 99%

“…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%

See 3 more Smart Citations

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Test Parametersmentioning

confidence: 99%