Numerical simulation and exergetic performance assessment of charging process in encapsulated ice thermal energy storage system

摘要: Abstract The solidification process in encapsulated ice thermal energy storage (EITES) system is simulated for water-filled capsules while neglecting tank wall effects and heat penetration. Energy exergy efficiencies were calculated varying capsule shape, inlet Heat Transfer Fluid (HTF) temperature as well HTF flow rate. 105 test cases are conducted including seven geometries, five temperatures, three rates. It was found that the did not accurately reflect performance, all cases, to be above 99.96%. However, ranged from 78 92%, provided better insight into losses. results suggest an effective way increase efficiency temperature; considerable gains possible by setting slightly below temperature. Varying geometry had inconsistent on efficiency, different geometries being optimal situations. Surprisingly, viscous dissipation very little effect a source of entropy generation. Thus, EITES designers could both rate order achieve full charging acceptable amount time.