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Imagine a person residing on 100th floor. When new TV was brought by him to 100th floor, energy was spent & converted to potential energy.
Now the TV weighing 20kg (say) needs to be disposed of. Rather than taking it downstairs through escalator, it is descended through a rope-pulley system connected
to generator & battery charger. It is a public system, that can be used by all residents of 100th floor at their convenient timings.
The trash collecting area is vertically below the pulley system. The rope doesn't have open ends. So a small part of energy would be spent for its upward movement while the trash is being lowered.
When the trash reaches ground floor, rope is removed & knot is tied by the person waiting there. After disposing of few objects, there would be multiple knots on the rope loop. This would be made in a bundle & descended to ground floor using new rope.
Of course, the pulley is designed to take care of knots in the rope.
||Why not just use regenerative braking on the
elevator? They already use counterweights, so little
energy was wasted anyway.
||kevin has you on all accounts there.
||Well, for a minute there I thought this was an idea to burn junk in a generator.