Parameter

Pacheco et al. [24]

Hoffmann et al. [25]

Energy

2.3 MWh

8.3 kWh

Filler material

Quartzite and silica filter sand

Quartzite rock

Heat transfer fluid

Molten salt

Rapeseed oil

Tank height

6.1 m

1.8 m

Tank diameter

3.0 m

0.4 m

Porosity

0.22

0.41

Discharge time

2 h

3.5 h

Temperature of HTF, charge

390˚C

210˚C

Temperature of HTF, discharge

290˚C

160˚C