A differential formulation of the T-History calorimetric method

Abstract

We present a differential formulation of the T-History calorimetric method in order to achieve thermodynamic consistency with phase transitions theory and to include the important experimental effect of the speed of the thermal process in calorimetric calculations. To illustrate the applicability of the new formulation, we show some numerical results which give an acceptable description of calorimetric measures.

Improved measurement technique for the characterization of organic and inorganic phase change materials using the T-history method

“…Majority of the reported studies [7][8][9][10][11][12][13][14][15] do not discuss the details of the experimental setup in terms of the temperature controlled environment. The temperature controlled facilities within the reported experiments are custom built in such way that clear understanding of temperature control implementation is not present.…”

“…The most recent T-history procedures include improvements in measurement arrangement and in the way of measurement processing as reported by Kravvaritis et al [10,11] for the "thermal delay method" and by Moreno-Alvarez at al. [12] for the "dT-history method". Peck et al [13] introduced the utilization of the PCM T-history curve's inflection point as the end of the phase change period instead of the release point of subcooling as suggested in the definition of the original method [7].…”

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

“…It is obvious that these derivative values can not be inserted directly into Eq. 4, since they would yield a negative heat capacity [11], which has also been adopted by our algorithm by setting [20].…”

The effects of thermistor linearization techniques on the T-history characterization of phase change materials

“…The majority of the T-history studies reported in the literature has not emphasized either the accuracy of the applied sensors or any other relevant sensor selection criteria as reported in the studies conducted by Yinping et al [7], Günther et al [8], Kravvaritis et al [9,10] and Moreno-Alvarez et al [11]. Few studies reported by Marin et al [12,13] and Lazaro et al [14] identified the usage of thermocouples and Pt-100 resistance temperature sensors.…”