[thackney]

I believe, cool the air slightly because the speed of the air molecules is reduced.

Adding resistance (friction) to a moving system does not create cooling. It creates heat.

Since prior to hitting the turbine blades, the individual air molecules are moving at the same speed as those around them, their is no air resistance at that point generating heat, until it hits the turbine blades.

[ROCKLOBSTER]

Since prior to hitting the turbine blades, the individual air molecules are moving at the same speed as those around them, their is no air resistance at that point generating heat, until it hits the turbine blades.

Well if that were the case, we'd all be burning to death up here in Maine where we have a tree every square yard.

The only way they produce any heat is when we burn them.

[cymbeline]

“does not create cooling. It creates heat”

If it were a fan blowing the air you would be correct, but it is the air blowing the fan. Energy is taken from the air and converted to electricity. The energy in the air is due to the motion of the air molecules. When there’s a net direction to the air molecules it appears as wind. When there’s no wind the molecules are in random motion and the aggregate speed of those molecules is felt as heat.

The turbine’s removal of energy from the air manifests itself as a lowering of the air’s velocity and also probably the lowering of temperature, but definitely not the increasing of temperature.