On: A new heat engine with no moving parts is as efficient as a steam turbine

[wishawa]

High temperature is the point. The efficiency of heat engines depend on the temperature difference (relative to ambient). The hotter you can go, the better. (granted this thing isn’t really an “engine”, but the trend still applies)

[dv_dt → wishawa]

But for practical applications, the availability and cost of materials to survive the operating temperature is also relevant.