As raynier and pfdietz pointed out [0], the assumptions you are using aren't necessarily correct.
replyAh yes. The heat pump.
replyMy response:
Carnot's theorem and refridgeration cycles rear their head. Your heat pump still needs power to pump heat uphill., negating any savings from a smaller radiator. And what happens when you shrink a radiator? It becomes a high temperature radiator, meaning the GPU must operate outside its operational tmperature of about 70 degrees C. So small radiator = big pump + extra solar panels and batteries + dead GPU
Also, how do you deal with the added cost and complexity for the solar tracking mechanisms for the "edge-on-to-the-Sun" radiator?
Soviets definitely experimented with airborne CO2 lasers.
replyIt just goes to show magical thinking isn't just an American thing.
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