A computational investigation on thermal energy storage system using Phase Change Material (PCM) is accomplished. The system is a honeycomb structure made of parallel triangular channels and half of them are filled with PCM and the others are passed through by the working fluid. Various configurations for different Channels Per Unit of length (CPU) are investigated. A comparison between a direct model and a porous medium model is carried out. The porous medium is modelled with the Darcy law and to evaluate the heat transfer among solid, PCM and air and the local thermal equilibrium assumption is employed. Permeability, inertial resistant coefficient, effective thermal conductivity and interfacial heat transfer coefficient of the equivalent porous medium are evaluated by means of the direct model. Numerical simulations are carried out using the Ansys-Fluent code for the direct model with triangular channels and equivalent porous medium. Results in terms of melting time, fraction liquid and temperature fields as function of time are presented and a comparison between the two models is accomplished.
Parallel Triangular Channel System for Latent Heat Thermal Energy Storages / Andreozzi, A.; Buonomo, B.; Ercole, D.; Manca, O.. - (2018), pp. 4411-4418. (Intervento presentato al convegno 16th International Heat Transfer Conference, IHTC-16 tenutosi a Beijing, China nel August 10-15) [10.1615/IHTC16.ecs.023991].
Parallel Triangular Channel System for Latent Heat Thermal Energy Storages
A. ANDREOZZI;
2018
Abstract
A computational investigation on thermal energy storage system using Phase Change Material (PCM) is accomplished. The system is a honeycomb structure made of parallel triangular channels and half of them are filled with PCM and the others are passed through by the working fluid. Various configurations for different Channels Per Unit of length (CPU) are investigated. A comparison between a direct model and a porous medium model is carried out. The porous medium is modelled with the Darcy law and to evaluate the heat transfer among solid, PCM and air and the local thermal equilibrium assumption is employed. Permeability, inertial resistant coefficient, effective thermal conductivity and interfacial heat transfer coefficient of the equivalent porous medium are evaluated by means of the direct model. Numerical simulations are carried out using the Ansys-Fluent code for the direct model with triangular channels and equivalent porous medium. Results in terms of melting time, fraction liquid and temperature fields as function of time are presented and a comparison between the two models is accomplished.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
