| Charging time (h) | Stored energy (kWh) | Maximum (˚C/m) |
Increasing inlet HTF temperature | 16 | 387.9 | 3.82 |
Constant inlet HTF temperature | 1 | 329.5 | 64.27 |
Solar collector field inlet HTF temperature | 6 | 340.0 | 7.06 |