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It has been done years ago with about a quarter of an acre of stainless steel pipe, it is the collector that has to be bigger with low temp differential. Parabolics would be simpler, molten salt storage and if you like a solar fridge for cold storage and a sterling engine. heat pump is another name, commercial sized ones are made to scavenge waste heat from industry to make power. zeolite and water seems promising too, peltier units, more ways to skin the cat. Not for lack of solutions are we in this bind...
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