China’s ultra-hot thermoacoustic Stirling heat pump, with no moving parts, could turn sunlight into 2,372°F thermal power for industries

https://interestingengineering.com/energy/china-heat-pump-turns-sunlight-into-heat

"heat source: twaste heat or solar energy... converts 293°F heat source into 518°F, shattering the previous 392°F limit... instead of mechanical compressors, uses interaction between sound waves/ heat converting thermal energy into intense acoustic waves to pump heat from a low-temperature source to a high-temperature sink... ceramics, petrochemicals and metallurgy... future: 2,372°F by 2040"