A theoretical study on the accuracy of the T-history method for enthalpy-temperature curve measurement: analysis of the influence of thermal gradients inside T-history samples

The present work analyses the effect of radial thermal gradients inside T-history samples on the enthalpy temperature curve measurement. A conduction heat transfer model has been utilized for this purpose. Some expressions have been obtained that relate the main dimensionless numbers of the experime...

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Bibliographic Details
Published in:Measurement science & technology 2015-12, Vol.26 (12), p.125001-10
Main Authors: Mazo, Javier, Delgado, Mónica, Lázaro, Ana, Dolado, Pablo, Peñalosa, Conchita, Marín, José María, Zalba, Belén
Format: Article
Language:English
Subjects:
Accuracy
Conduction heating
Deviation
Enthalpy
Mathematical models
Phase change
phase change material
Specific heat
storage capacity
T-history method
Work measurement
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Summary:The present work analyses the effect of radial thermal gradients inside T-history samples on the enthalpy temperature curve measurement. A conduction heat transfer model has been utilized for this purpose. Some expressions have been obtained that relate the main dimensionless numbers of the experiments with the deviations in specific heat capacity, phase change enthalpy and phase change temperature estimations. Although these relations can only be strictly applied to solid materials (e.g. measurements of shape stabilized phase change materials), they can provide some useful and conservative bounds for the deviations of the T-history method. Biot numbers emerge as the most relevant dimensionless parameters in the accuracy of the specific heat capacity and phase change enthalpy estimation whereas this model predicts a negligible influence of the temperature levels used for the experiments or the Stefan number.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/26/12/125001