Most Useless Perpetual Energy Wasting Machine in an Elevator
“Perpetual Energy Wasting Machine” is a rope and pulley mechanism, installed in the staircase of the WRO Art Center in Wroclaw, Poland. The mechanism connects the sliding doors of the elevator in one floor with the elevator call button on another floor. Operating in two directions on the first and on the second floor, the contraption automatically moves the elevator cabin in an infinite loop between those two levels.
How much energy does the setup waste?
The “Perpetual Energy Wasting Machine” moves the elevator in recurring cycles. In the first half cycle, the elevator is lifted up one floor, while the latter half cycle brings the elevator down to its original position again. As this is an hydraulic elevator, and as the cabin´s mass is not equalized by a counterweight, only the movement up consumes electricity. Estimating that the empty elevator cabin has a mass of 350 Kilograms, the wasted energy is about 11.8 Kilojoules per cycle (which equals to the metabolic energy of ca. 1/3 grams of fat, according to Wolfram Alpha ). A modified printing calculator inside the elevator cabin keeps track of the wasted energy, automatically adding up 5.9 Kilojoules for each half cycle. The results of this symbolic calculation – which does neither regard energy loss by friction, nor a heavier cabin due to possible passengers – go straight to a waste bin, located beneath the printing calculator.