It is an important topic in front of us to save energies of fan pump.

In places such as India, ingenious, if slightly dangerous, devices exist whereby a fan is used to blow air through a mesh of straw which has water trickling through it powered by a small pump.

The cooling suit runs off of the same onboard battery that powers the suit's lamp, fan, and comm link; a pump circulates a liter of ice water (stored in a specially shaped bottle) from head to toe.