Originally posted by forkedknight
So you're going to use NASA quality thermal composites or ceramics for manufacturing fuels? Those kinds of materials are EXPENSIVE to produce. The main industries that use materials like that are scientific research, military, and sporting goods. Hardy anyone else uses them because they cost too much.
*edit* that, and space isn't exactly the most difficult environment for insulation. Open space itself is one of the best insulators known.
Not THAT big a deal, the Apollo ones were just big thermos bottles, vacuum inside like you said, great insulator, especially with IR reflectors on the inside of the outer wall which directs heat back inside and keeps it warm or cold that much longer. Anyway, it's just my musing about this, they don't need to keep it hot for weeks on end, only a day or so, which means it could be nothing more than a fiberglass insulated tank like a hot water tank in your house. They do a pretty darn good job of keeping the heat in. It wouldn't need anything fancy. I would think if they used solar, they would have backups anyway in case of storms and just cloudy weather. Some kind of electric heater that would kick in when solar went out too long for the insulation to keep it hot enough.
My guess is they would not even start with solar, but add that later so the primary heat would start out being electrical till proof of concept.
You could figure, why go to the trouble and expense of solar concentrators when they don't know for sure if it's going to work till they actually get a process going. Electric heaters, while not exactly green are cheap and reliable so it's one part of the equation that would keep things simple till the system is proven out.
BTW, space is a great insulator for CONDUCTION heat. It does nothing to stop IR, since IR is a short wavelength radio wave it propagates quite nicely through space, even though it follows the inverse square law of intensity. That's how they cool some space craft, put out radiators that dump IR into space and so cools of the insides, a workable solution but it takes a lot of surface area to make a significant BTU exchange.