pump ammonia! Can evaporate at PVC compatible temperature.
A very minor problem with this scheme is the mile thickness insulation needed to not lose much of the sun’s heat to space, on the trip back. A 2nd minor problem is the actual pipe section close to the sun.
pump ammonia! Can evaporate at PVC compatible temperature.
A very minor problem with this scheme is the mile thickness insulation needed to not lose much of the sun’s heat to space, on the trip back. A 2nd minor problem is the actual pipe section close to the sun.