Moves 1 MW of heat with 0.4 MW of work? I.e. 2.5 COP {coefficient of performance). That's insane, and I mean that in a good way. Could you dig me up a cite for that?

That's thumping the Carnot limit: [[T_cold / (T_hot − T_cold)]].

2.5, while rejecting at 500 K, cold side's at least 357 K (eeehhhhhhh 84 °C) . . . and that's an absolutely perfect Carnot machine. At 50% Carnot -- a pretty good heat pump, real world performance is 40-60 -- cold side's at 417 K (144 °C). 417k, feeding your GPU coolant loops.

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hex4def6 2 hours ago | parent [-]

Think you have an error -- it's t_hot / (t_hot - t_cold)

With those numbers, ideal carnot would be 500/(500-357) = 3.5.

Multi-stage could potentially get you to a COP of 2 or so. So 0.5MW.

	▲	lopsotronic 19 minutes ago \| parent [-]
		I believe that's Carnot COP for a heat pump used for heat+. I used the refrigeration version, T_cold / (T_hot - T_cold), which I'm 80 percent sure is the right one here. Depends on which heat you want Heat adding to hot side: COP_heat = Q_hot / W = T_hot / (T_hot − T_cold). Heat leaving the cold side: COP_cool = Q_cold / W = T_cold / (T_hot − T_cold). Another one (more common in the day to day, for me at least): heat-engine efficiency, η = 1 - T_cold / T_hot. Cycle forward to make work from heat.