Correction of the enthalpy–temperature curve of phase change materials obtained from the T-History method based on a transient heat conduction model

Characterizing phase change materials using the T-History method: On the factors influencing the accuracy and precision of the enthalpy-temperature curve

“…This is likely due to the smaller sample size with the same level of insulation compared to B1 and B2. This is in agreement with the prediction of our previous simulation study that the larger the present thermal mass of the insulation is with respect to the sample size, the larger the systematic underestimation of the enthalpy [13]. However, the enthalpy shift of setup B2…”

“…The thermal mass of the insulation is deliberately neglected in Eq. 1 to study experimentally the influence of this assumption in the enthalpy results in analogy to our previous numerical work [13].…”

“…Recent numerical studies done by Mazo et al 2015 [12] on uninsulated sample holders and by the authors [13] on insulated sample holders have started to critically address the validity of the assumptions in Eq. 1 and 2.…”

“…A first deviation in the heat flux is present after the initial ambient temperature step change when the thermal diffusivity of sample and reference are not exactly equal [13].…”

“…In [13], however, systematic errors in the range of up to 4% of the considered enthalpy difference due to neglecting transient effects caused by the thermal mass of the insulation material itself were predicted. The error increased the more insulation thermal mass was present in the setup.…”