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

Mazo, J. ; Delgado, M. ; Lázaro, A. (Universidad de Zaragoza) ; Dolado, P. ; Peñalosa, C. (Universidad de Zaragoza) ; Marín, J.M. (Universidad de Zaragoza) ; Zalba, B. (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.1088/0957-0233/26/12/125001

Año: 2015

Publicado en: MEASUREMENT SCIENCE & TECHNOLOGY 26, 12 (2015), 125001 [10 pp.]
ISSN: 0957-0233

Factor impacto JCR: 1.492 (2015)

Categ. JCR: ENGINEERING, MULTIDISCIPLINARY rank: 26 / 85 = 0.306 (2015) - Q2 - T1
Categ. JCR: INSTRUMENTS & INSTRUMENTATION rank: 25 / 56 = 0.446 (2015) - Q2 - T2

Factor impacto SCIMAGO: 0.704 - Engineering (miscellaneous) (Q1) - Instrumentation (Q1) - Applied Mathematics (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/ENE2014-57262-R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/ENE2011-22722
Financiación: info:eu-repo/grantAgreement/ES/MICINN/ENE2011-28269-C03-01

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Proy. investigacion HJA (Dpto. Ingeniería Mecánica)
Área (Departamento): Área Máquinas y Motores Térmi. (Dpto. Ingeniería Mecánica)