Thermophysical properties of a phase change dispersion for cooling around 50 °c

Heat Transfer Performance Potential with a High-Temperature Phase Change Dispersion

“…where λ is the thermal conductivity of the PCD, which was found in a previous investigation by Fischer et al [9] to be 0.529 W m −1 K −1 at 25°C (when the PCM in the PCD was fully crystallised) and 0.561 W m −1 K −1 at 60°C (when the PCM in the PCD was fully melted). Additionally, to calculate the apparent specific heat capacity (c p ) of the PCD during melting, in the experimental test setup for determining the quantity of heat that the PCD was able to store during cycling, the totalc p over the entire length of the tube was calculated in accordance with:c…”

“…For the surfactant system, two steareth-based surfactants were used at 4 wt.%. The full formulation details of the PCD used in this investigation can be seen in [9].…”

“…In a further study, Zhang et al [11] determined the stability of a capric-acid-/lauric-acid-eutectic-based PCD and found that the PCD showed excellent stability over 100 freeze-melt cycles. Alongside the high stabilities of fatty acids shown by Zhang et al [11] and Puupponen et al [10] and the comparable phase change enthalpies shown by Zhang et al [12], fatty acids are also have the properties of being abundant, non-toxic, and bio-based [9], rendering them promising candidates for PCD development. However, thus far, the research into fatty acids as bio-based alternatives for PCDs has been limited to thermophysical and formulation analyses; thus far, no heat transfer experiments have been performed.…”

“…However, paraffins are products of petroleum refining, which removes currently formulated PCDs as potential contributors to a sustainable energy model [8]. Furthermore, it has been suggested that, from the point of view of applications, the relative inertness of paraffins can cause them to separate from the PCD, thereby attaching themselves to the piping and heat exchangers in systems [9]. The removal of these paraffin layers is a difficult and time-consuming process that requires strong organic solvents.…”

“…The lack of research on both PCDs above 30°C and non-paraffin-based PCDs has led the authors of this paper to formulate a novel PCD that has a melting point at 50°C and is bio-based. The formulation details and the relevant thermophysical properties of this PCD can be seen in [9]. Additionally, because there are few articles that have discussed the heat transfer performance of bio-based PCDs, this article aims to highlight preliminary heat transfer performance results.…”