Candidate questions or processes:
How can I use high-grade heat to regenerate a desiccant?
How can I use very-high-grade heat to run a Stirling engine?
How can I use high-grade heat to run a turbine?
How can I use low-grade heat to move air? How much "pull" can a draft pull?
Goswami: turbines for combined power and cooling
(poor URL is http:///www.fh-luebeck.de/an/pt/solar/publish/euros-00.pdf )
Low-temperature low-pressure vapor turbines (like for ocean currents)
Scroll expanders for solar-driven mechanical work
Steam engines and steam turbines (not too "novel", admittedly)
Solar chimneys (the huge ones for megawatt power)
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