In that case, don’t dump waste heat into black holes so large that it’s impossible to use them as eventual energy sources. Instead dump waste heat into medium sized black holes, which can feasibly be used as eventual energy sources.
I think the size might have to be pretty precise to get this right (I think decay duration is cubic in mass), so they’d probably need to be engineered to have a particular size. (E.g. add mass to a small black hole until it hits the right size.)
But, yeah, with this constraint, I think it can maybe work. (I don’t know the decay duration for the smallest naturally occurring black holes. But as long as this is sufficient low, the proposal works.)
In that case, don’t dump waste heat into black holes so large that it’s impossible to use them as eventual energy sources. Instead dump waste heat into medium sized black holes, which can feasibly be used as eventual energy sources.
I think the size might have to be pretty precise to get this right (I think decay duration is cubic in mass), so they’d probably need to be engineered to have a particular size. (E.g. add mass to a small black hole until it hits the right size.)
But, yeah, with this constraint, I think it can maybe work. (I don’t know the decay duration for the smallest naturally occurring black holes. But as long as this is sufficient low, the proposal works.)