Empirical equations for viscosity and specific heat capacity determination of paraffin PCM and fatty acid PCM

3rd International Conference on Innovative Materials, Structures and Technologies

Barreneche, C.^1,2 ; Ferrer, G.^1 ; Palacios, A.^1,2 ; Inés Fernández, A.^1 ; Cabeza, L.F.^1

GREA InnovacióConcurrent, INSPIRES Research Centre, Universitat de Lleida, Pere de Cabrera s/n, Lleida

25001, Spain^1

Department of Materials Science and Physical Chemistry, Universitat de Barcelona, Martíi Franqués 1-11, Barcelona

08028, Spain^2

关键词: Cycling stability;    Empirical calculations;    Empirical equations;    Phase change enthalpy;    Phase change temperature;    Relative errors;    Subcoolings;    Time-consuming tasks;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/251/1/012114/pdf
DOI  :  10.1088/1757-899X/251/1/012114

来源: IOP

【 摘 要 】

Phase change materials (PCM) used in thermal energy storage (TES) systems have been presented, over recent years, as one of the most effective options in energy storage. Paraffin and fatty acids are some of the most used PCM in TES systems, as they have high phase change enthalpy and in addition they do not present subcooling nor hysteresis and have proper cycling stability. The simulations and design of TES systems require the knowledge of the thermophysical properties of PCM. Thermal conductivity, viscosity, specific heat capacity (Cp) can be experimentally determined, but these are material and time consuming tasks. To avoid or to reduce them, and to have reliable data without the need of experimentation, thermal properties can be calculated by empirical equations. In this study, five different equations are given to calculate the viscosity and specific heat capacity of fatty acid PCM and paraffin PCM. Two of these equations concern, respectively, the empirical calculation of the viscosity and liquid Cp of the whole paraffin PCM family, while the other three equations presented are for the corresponding calculation of viscosity, solid Cp, liquid Cp of the whole fatty acid family of PCM. Therefore, this study summarize the work performed to obtain the main empirical equations to measure the above mentioned properties for whole fatty acid PCM family and whole paraffin PCM family. Moreover, empirical equations have been obtained to calculate these properties for other materials of these PCM groups and these empirical equations can be extrapolated for PCM with higher or lower phase change temperatures within a lower relative error 4%.