Simultaneous charging and discharging of multi-tube heat storage systems using copper fins and Cu nanoparticles

In this paper, heat transfer of a multi-tube exchanger filled with RT82, fins, and nanoparticles is investigated using numerical modeling. There are four fluid (HTF) tubes embedded in shell that contains PCM. The PCM under simultaneous charging discharging (SCD) conditions caused by pumping two hot fluids (HHTF) cold (CHTF). arrangement these HHTFs CHTFs, as geometrical factors, compared each other. Results demonstrated based on positioning, steady-state liquid fraction alternates between 37% 60% setting at the lower half claims maximum 60%. Fins addition results lead to varying outcome SCD, unlike melting cases where fin proved more practical criterion. Under SCD fins show an advantage short time (<100 min), however, long adding will result less available thermal energy. Cu have been added into response time, its impact negligible. Hence, while condition, not recommended. among different arrangements one inner located bottom registers most favorable outcome.