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Kyriacou, P. A.; Stankovic, S. B.
Languages: English
Types: Unknown
Subjects: TK
Recently the interest in Phase Change Materials (PCMs) has grown significantly amongst researchers [1-9]. Namely, these materials, due to their ability to store large amounts of thermal energy in relatively small temperature intervals, can be effectively used for various thermal energy storage (TES) applications. Nevertheless, accurate knowledge of the thermal properties of PCMs is a prerequisite before design processes and real time deployments of any TES applications. \ud \ud The T-history method is widely used for the investigation of phase change materials. The majority of the T-history studies reported in the literature during the last 20 years aim to reduce the temperature and the heat storage uncertainty associated with the PCMs measurement [3-9]. Reduction of these uncertainties is important since it should provide better material utilisation. This paper presents an improved measurement technique for the characterisation of PCMs using the T-history method. The main modifications involved in the measurement process are briefly summarized below. \ud \ud Primarily, suggested improvements include the selection of the thermally controlled environment and the temperature sensing modalities for the T-history setup. This was followed by the development of the adequate instrumentation and data acquisition system. In addition, the mathematical model given by Marin et al. was adjusted for the data analysis in order to take the subcooling phenomenon into account. The calculated results on heat capacity were presented as heat density in given temperature intervals, as suggested by Mehling et al. Moreover, the determination of the total phase change heat in case of both cooling and heating cycles showed that the reduction of relevant temperature and heat storage uncertainties was achieved.
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    • [1] Zalba B, Marin J M, Cabeza L F and Mehling H 2003 Review on thermal energy storage with phase change: materials, heat transfer analysis and applications Appl. Therm. Engineering 23 251-283.
    • [2] Zhou D, Zhao C Y and Tian Y 2012 Review on thermal energy storage with phase change materials (PCMs) in building applications Appl. Energy 92 593-605.
    • [3] Zhang Y, Jiang Y and Jiang Y 1999 A simple method, the T-history method, of determining the heat of fusion, specific heat and thermal conductivity of phase change materials Meas. Sci. Technol. 10 201-5
    • [4] Günther E, Hiebler S, Mehling H and Redlich R 2009 Enthalpy of Phase Change Materials as a Function of Temperature: Required Accuracy and Suitable Measurement Methods Int. J. Thermophys. 30 1257-69
    • [5] Marin J M, Zalba B, Cabeza L F and Mehling H 2003 Determination of enthalpytemperature curves of phase change materials with the temperature-history method: improvement to temperature dependent properties Meas. Sci. Technol. 14 184-9
    • [6] Lázaro A, Günther E, Mehling H, Hiebler S, Marin J M and Zalba B 2006 Verication of a T-history installation to measure enthalpy versus temperature curves of phase change materials Meas. Sci. Technol. 17 2168-74
    • [7] Kravvaritis E D, Antonopoulos K A and Tzivanidis C 2010 Improvements to the measurement of the thermal properties of phase change materials Meas. Sci. Technol. 21 5103-12
    • [8] Moreno-Alvarez L, Herrera J N and Meneses-Fabian C 2010 A differential formulation of the T-history calorimetric method Meas. Sci. Technol. 21 7001-5
    • [9] Kravvaritis E D, Antonopoulos K A and Tzivanidis C 2011 Experimental determination of the effective thermal capacity function and other thermal properties for various phase change materials using the thermal delay method Appl. Energy 88 4459-4469
    • [10] Mehling H, Hiebler S and Günther E 2010 New method to evaluate the heat storage density in latent heat storage for arbitrary temperature ranges Appl. Therm. Engineering 30 2652-2657.
    • [11] Rakocevic G 2009 Overview of sensors for Wireless Sensor Networks Trans. Internet Res. 5 13-18
    • [12] Nenova Z P and Nenov T G 2009 Linearization Circuit of the Thermistor Connection IEEE Trans. Instr. Meas. 58 441-449
    • [13] Stankovic S B and Kyriacou P A 2011 Comparison of thermistor linearization techniques for accurate temperature measurement in phase change materials J. Phys.: Conf. Ser. 307 012009
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