Thermal characterization of homogeneous walls using inverse method

Chaffar, Khaled; Chauchois, Alexis; Defer, Didier; Zalewski, Laurent

doi:10.1016/j.enbuild.2014.04.038

Cited by 38 publications

(19 citation statements)

References 18 publications

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“…For example, the thermal flux through the envelope could be forcedly increased using heat transfer plates for radiant heating at high temperature, as performed in [27]. Operating in this way, the method would lose two main strength, namely the non-invasiveness and the speed in the measurement procedure, though.…”

Section: Discussionmentioning

confidence: 97%

A comprehensive experimental approach for the validation of quantitative infrared thermography in the evaluation of building thermal transmittance

Tonelli²,

2015

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Section: Discussionmentioning

confidence: 97%

A comprehensive experimental approach for the validation of quantitative infrared thermography in the evaluation of building thermal transmittance

Tonelli²,

2015

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“…The quantitative thermography method provides a measure of the overall transmittance of façades in a short period of time. There is increasing interest in this method [13,[21][22][23][24][25][26][27][28].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Review of criteria for determining HFM minimum test duration

Gaspar

Casals

Gangolells

2018

Energy and Buildings

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The actual thermal behaviour of façades is important to identify suitable energy-saving measures and increase the energy performance of existing buildings. However, the accuracy of in situ measurements of façades' U-values varies widely, mostly due to inadequate test durations. The aim of this paper was to evaluate the minimum duration of in situ experimental campaigns to measure the thermal transmittance of existing buildings' façades using the heat flow meter method, and to analyse the thermal performance of the façade during the test. Minimum test duration was determined according to data quality criteria, variability of results criteria, and standardized criteria for different ranges of theoretical thermal transmittance and for the same range of average temperature difference. Then, the minimum test duration results were compared. The findings show that ISO criteria are more sensitive and provide more accurate results, requiring a longer test duration. However, when certification is not required, the duration of the test could be reduced by applying data quality and variability of results criteria. The minimum duration of experimental campaigns depends on the theoretical thermal transmittance and the stability of climatic conditions. Moreover, results are more accurate when the dynamic method is used.

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“…Thermocouple probes are placed at the different interfaces and record the variations in temperature when the whole multilayer is subjected to stimulation. In addition to thermal conductivity and heat capacity, Chaffar et al [14] estimated also the surface film coefficient of a homogeneous panel by applying a heat flux and studying the response in terms of the temperature recorded by infrared thermography on the opposite surface. With regards to PCMs, Lachheb et al [15] proposed a method for estimating thermal conductivity, specific heat and thermal diffusivity of paraffin/graphite PCM composites from laboratory tests under controlled boundary conditions, but material properties were evaluated at room temperature and their dependency on temperature was hence not investigated.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Thermal Properties of PCMs through Inverse Modelling

Cascone

Perino

2015

Energy Procedia

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Even though the use of Phase Change Materials (PCMs) is promising to improve the energy efficiency of buildings, their application in the building sector is still very limited. One of the obstacles to the diffusion of PCMs is the lack of information regarding their thermo-physical properties. A method for estimating the specific heat-temperature curve of a PCM through inverse modelling is herewith presented. This method combined experimental data with a numerical tool able to simulate multilayer walls with the inclusion of PCM materials. Results were validated against tests on different samples and discussed in comparison with a low-speed DSC measurement.

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Thermal characterization of homogeneous walls using inverse method

Cited by 38 publications

References 18 publications

A comprehensive experimental approach for the validation of quantitative infrared thermography in the evaluation of building thermal transmittance

A comprehensive experimental approach for the validation of quantitative infrared thermography in the evaluation of building thermal transmittance

Review of criteria for determining HFM minimum test duration

Estimation of the Thermal Properties of PCMs through Inverse Modelling

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