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Without increasing the pressure in the outlet of the pipe?
I mean we want to transfer air from point A to point B using a piping system which is equipped with a fan. Now there is energy lost in the outlet because the air exits with velocity in the atmospheric pressure, so the problem is how to use this energy ( high speed air) without increasing the pressure in the outlet of the fan. offcourse if it was water instead of the air, we could get the energy by installing a turbine next to the outlet pipe and still let the water come out in the atmospheric pressure