期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 26, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/26/12/125001
关键词
T-history method; phase change material; enthalpy; storage capacity
资金
- Spanish government [(MICINN-FEDER): ENE2011-28269-C03-01, ENE2011-22722, ENE2014-57262-R]
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.
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