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for better insulation you can put more reflecting layers inside. i've heard of insulation for liquid helium pipe, it used thousands of layers of aluminized mylar between two tubes in vacuum. it's one barrier between 4.2K and room temperature, and it works good enough to be used in helium manufacturing plant
You ever seen those vacuum ovens too? Kinda doing the opposite, only letting radiation in, but from just solar radiation I've heard in sub zero temps they can get to a constant 500 F. Wonder what one would be capable of with some one way mirror type refraction to keep all that shit in
yes but no reflective surfaces involved this time, at least not for insulation. compare that to vacuum tube water heater, it has a heat pipe with a fin, painted black, which is in turn insulated with a two walled evacuated glass tube. it's there just to stop convection from carrying heat away. i guess something very similar is going on there