Comment on Finland warms up the world’s largest sand battery, and the economics look appealing
Hirom@beehaw.org 4 weeks ago
Pornainen’s battery is charged using electricity from the grid
How so, do they use heater resistors or a heat pump?
Electricity may be cheap sometimes but still, heater resistors aren’t the most efficient.
perestroika@slrpnk.net 4 weeks ago
They use resistive heating, so they can only charge it dirt cheap when there is surplus solar or wind.
Hirom@beehaw.org 4 weeks ago
Okay, I guess the heat pumps aren’t suitable due to the economics or maybe cannot reach high enough temperatures.
perestroika@slrpnk.net 4 weeks ago
As much as I’ve understood, yes - heat pumps have difficulty with reaching high temperatures.