In my learning about energy, I’ve picked up on a few more problems with concentrated solar power, which is the design of the wing-toasting facility at Ivanpah.
Keeping the molten salt melted
All those mirrors focus the sun on the top of the tower in order to superheat a liquid, which is then circulated to turbines, which spin, thus generating electricity. The liquid returns to the top of the tower for another superheating.
The melting temperature of molten salt is in the range of 225° C or perhaps 260° C. Of course my accounting brain doesn’t think Celsius, so I translated those numbers, coming up with something in the range of 437° F or 500° F. Let’s just call that 400°.
My accounting brain can tell that is really hot.
Another thing I have learned is that once the sun goes down the molten salt is allowed to freeze. It would take a lot of energy to keep that much salt over 400 so that it stayed liquid. That means in the morning it is either sludge or solid and needs to be heated above the melting point so it will work.