Review of Thermophysical Property Data of Octadecane for Phase-Change Studies

Abstract

In this work we derive temperature-dependent functions for the most important material properties needed for phase change studies with octadecane. Over 80 references are reviewed in which at least one thermophysical property of octadecane is measured. The functions are valid ±40 K around the melting temperature and are surrounded by their confidence interval. It turns out that the values for the solid phase have much broader confidence intervals than the ones of the liquid phase. Hence, more accurate measurements are particularly desirable for the solid state material properties.

Shape-stabilized phase change materials: Performance of simple physical blending synthesis and the potential of coconut based materials

“…Both capillary force and surface tension will affect the flowability of PCM inside the carbon pores. The viscosity of coconut oil was reported to be 36 mPas and 7.6 mPas [50] and octadecane was reported to be 3.9 mPas and 1.6 mPas [51] at room temperature and 80 o C, respectively. Higher temperatures will increase the possibility of leakage; however, the capillary force caused by the micropore channels can prevent this leakage.…”

Effects of Volume Changes on the Thermal Performance of PCM Layers Subjected to Oscillations of the Ambient Temperature: Transient and Steady Periodic Regimes

“…The thermal performance of a PCM layer of octadecane is determined by estimating the time evolution of the dynamical variables, the thermal energy released (absorbed) and the thermal energy released by the interior surface. The thermodynamic properties of octadecane are assumed to be constant in the temperature range considered in this work, and equal to their values close to the saturation temperature of the PCM [ 27 ]. For the liquid(solid) phase , and .…”

“…The volumetric effects produced by the density difference between liquid and solid phases is considered when the external surface is subjected to periodic boundary conditions and the temperature of the internal surface is constant and below . The temperature dependence of liquid and solid densities is negligible within the temperature range and PCM considered in this work [ 27 ]. Octadecane is used as the PCM, and within the experimental error, the density of the solid is practically constant in a wide temperature range .…”

Triazine derivatives as organic phase change materials with inherently low flammability

“…Compared to other passive TES methods such as sensible heat storage and thermochemical heat storage, PCMs often have advantages including low material cost, narrow range of operating temperatures, and relatively high heat storage capacity. 11 Broadly speaking, PCMs can be classified into two categories, namely organic PCMs (most commonly paraffin waxes, 12 or long chain alkanes, 13 but also fatty acids, 14 esters, 15 amines, 16 and sugar alcohols 17 ), and inorganic PCMs (such as salts, salt hydrates, metals, and alloys). 18 Each of these classes has their associated advantages and disadvantages.…”