A computational analysis of a transient thermal control device using phase change material (PCM) is carried out in this work. The investigated configuration is a honeycomb solid checkerboard matrix filled with PCM. The honeycomb is a set of different parallel squared channels; half of the channels are filled with PCM and the other ones are passed through by the working fluid. Various configurations are investigated for different channels per unit of length (CPL), heat fluxes, and inlet velocities. A comparison between the direct honeycomb model and a porous medium model is made. The porous medium is modeled with the Darcy-Forchheimer law, and a local thermal nonequilibrium condition is assumed to analyze the heat exchange between the solid and fluid phases. The characteristics such as permeability, inertial resistant coefficient, effective thermal conductivity, and interfacial heat transfer are calculated using the results of the direct honeycomb model; the values are compared with the porous medium model, successively. The numerical analysis is carried out employing the Ansys-Fluent 15.0 code. Results in terms of melting time, temperature fields, and stored energy as function of time are presented for the charging and discharging phase.
Investigation on latent thermal energy storage with parallel squared channel systems / Andreozzi, Assunta; Buonomo, Bernardo; Ercole, Davide; Manca, Oronzio. - In: MULTIPHASE SCIENCE AND TECHNOLOGY. - ISSN 0276-1459. - 30:2-3(2018), pp. 121-134. [10.1615/MultScienTechn.2018024847]
Investigation on latent thermal energy storage with parallel squared channel systems
Andreozzi, Assunta;
2018
Abstract
A computational analysis of a transient thermal control device using phase change material (PCM) is carried out in this work. The investigated configuration is a honeycomb solid checkerboard matrix filled with PCM. The honeycomb is a set of different parallel squared channels; half of the channels are filled with PCM and the other ones are passed through by the working fluid. Various configurations are investigated for different channels per unit of length (CPL), heat fluxes, and inlet velocities. A comparison between the direct honeycomb model and a porous medium model is made. The porous medium is modeled with the Darcy-Forchheimer law, and a local thermal nonequilibrium condition is assumed to analyze the heat exchange between the solid and fluid phases. The characteristics such as permeability, inertial resistant coefficient, effective thermal conductivity, and interfacial heat transfer are calculated using the results of the direct honeycomb model; the values are compared with the porous medium model, successively. The numerical analysis is carried out employing the Ansys-Fluent 15.0 code. Results in terms of melting time, temperature fields, and stored energy as function of time are presented for the charging and discharging phase.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.