[HPsquared]

It'd be interesting to ponder whether such a "heat ray" would work, in terms of thermodynamics. Some kind of heat pump, the hot side of which is hot enough to radiate into space? I can't imagine that having a net cooling effect when considering the Carnot efficiency of a refrigeration cycle. Maybe a giant ice machine in space? (Then again, any ice would probably create more heating than cooling as it enters our gravity well or deorbits). Anyone have any ideas?

[hinkley]

I’m… cautious but optimistic. They have actual installations so it must not be complete bullshit.

Absorption and emission bands matter. They are in fact made of exotic materials (rare earths IIRC) so it’s at least plausible.

[zardo]

The cold side is what your heat ray hits, the idea is that would be the CMWB.