Which heat engine is being used by pumped heat electrical storage system?
A pumped heat electrical storage system is able to store electricity in the form of heat(500 degree Celsius) and cryogenic temperature(-160 degree Celsius).
In many articles I found out that they could achieve round trip efficiency similar to that of pumped hydro.
I was wondering which heat engine is being used in a pumped heat electrical storage to achieve such high efficiency. Is that high efficiency even possible?
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