4 ms·
How efficient is the system? Liquifying is nowt without losses and neither is turning pressure into electricity. Edit: They claim 75-80%. Is that realistic? E
by heisenbit 5y ago
How efficient is the system? Liquifying is nowt without losses and neither is turning pressure into electricity.
Edit: They claim 75-80%. Is that realistic?
Edit: Does this include the assumption that the compression heat can be used? „The heat is then extracted and stored in “bricks” made of steel shot and quartzite for later use, cooling down the CO2 to an ambient temperature.“
- Turing_Machine 5y ago> Edit: They claim 75-80%. Is that realistic? Seems very doubtful, based on the reported temperature differential and the formula for the theoretical maximum efficiency of a Carnot cycle heat engine.
- namibj 5y agoCarnot cancels out if you follow up with it in reverse.
- Turing_Machine 5y agoNope. While Carnot-cycle engines are reversible, the losses don't cancel out. You just lose the energy to entropy on both ends.
- namibj 5y agoThe point was that the Carnot efficiency of using a thermal buffer to store mechanical energy cancels out between storing and releasing. Yes, you don't have a Carnot-cycle in practice, and the thermal buffer likely won't offer isotherm storage, either. But you still can't use Carnot-cycle efficiency to determine some sort of round-trip efficiency of this thermal-based storage device with mechanical input/output ports.