Apparatus for simultaneous temperature and heat-flow measurements under transient conditions

Leclercq, D.; Théry, P.

doi:10.1063/1.1137377

Cited by 35 publications

(12 citation statements)

References 6 publications

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“…The whole system was maintained vertical using a pneumatic jack. The fluxmeters used here were special ones called ''with tangential gradients'' [25]. Their thickness was about 0.2 mm, their dimensions were those of the brick (210 Â 140 mm), and their sensitivity was about 110 lV/(W/m 2 ).…”

Section: Experimental Set-upmentioning

confidence: 99%

Experimental and numerical investigation of a phase change material: Thermal-energy storage and release

et al. 2011

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Section: Experimental Set-upmentioning

confidence: 99%

Experimental and numerical investigation of a phase change material: Thermal-energy storage and release

et al. 2011

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“…The fluxes are measured by means of "tangential gradient" sensors set on the surface of the exchangers [1,2]. The operating principle helps to limit perturbations in measurements and boundary conditions as much as possible.…”

Section: Instrumentationmentioning

confidence: 99%

Conception of an isothermal calorimeter for concrete— Determination of the apparent activation energy

2002

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A B S T R A C T R I~ S U M I~Instrumentation was developed to perform calorimetric tests on concrete in isothermal conditions using 0.11 x 0.22 m cylindrical samples. The purpose of this article is to study the validity of Arrhenius' law and determine the changes occurring in the apparent activation energy of concrete as a function of temperature, by using this technique. Heat of hydration measurements were made for various isothermal curing conditions (10, 20, 30 and 40~ enabling the apparent activation energy to be determined over this range of temperature using two different methods: the method of "superposition" and the method of "rates". This parameter was calculated over a range of heat varying from 10 J/g to 140 J/g (corresponding to about 50% of the final value). The two methods give relatively similar results (with deviations of the order of 3 kJ/mol). However, it is noted that the apparent activation energy varies as a function of the temperature range considered, which limits the use of this technique to thin elements (of less than 0.2 m) subjected to slight temperature rises. In the case of the concrete studied here, it seems however possible to use a single apparent activation energy value over the entire temperature range. Une instrumentation a dtd ddveloppe'e pour effectuer des essais calorimdtriques sur bdton en conditions isothermes

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“…The whole apparatus is maintained in place using a pneumatic jack, slightly tightened. The fluxmeters used here are special "tangential gradient heat fluxmeters" designed, built, calibrated, and used over a period of nearly 20 years at LGCgE [26]. Their thickness is about 0.2 mm, and their sensitivity about 45 µV · W −1 · m −2 for a sensor having an active surface of 100 cm 2 .…”

Section: Experimental Devicementioning

confidence: 99%

“…Their thickness is about 0.2 mm, and their sensitivity about 45 µV · W −1 · m −2 for a sensor having an active surface of 100 cm 2 . Over the years, these sensors were the subject of regular developments and improvements making it possible to obtain highly reliable measurements [26].…”

Section: Experimental Devicementioning

confidence: 99%

A Novel Technique for Experimental Thermophysical Characterization of Phase-Change Materials

et al. 2010

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The major objective of this project is to use phase-change materials (PCMs) as integrated components in passive solar heat recovery systems. The suggested approach involves experimental investigations and characterization of the global behavior of a parallelepiped "material wrap" filled with the PCM. The experimental apparatus permits simultaneous measurements of heat fluxes and temperatures. It also allows imposing and measuring temperatures variations with respect to selected time scales between the two predominant faces of the sample. The instantaneous heat flux measurements allow the determination of the "apparent" or overall heat storage capacities and thermal conductivities of the PCM-in the solid and liquid states-and that of the latent heat of melting. Results were found to be very satisfactory.

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Apparatus for simultaneous temperature and heat-flow measurements under transient conditions

Cited by 35 publications

References 6 publications

Experimental and numerical investigation of a phase change material: Thermal-energy storage and release

Experimental and numerical investigation of a phase change material: Thermal-energy storage and release

Conception of an isothermal calorimeter for concrete— Determination of the apparent activation energy

A Novel Technique for Experimental Thermophysical Characterization of Phase-Change Materials

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