re: Input electrical power = fan heat

[TurbineBlade]

Hi,

I read about that when a fan + motor runs inside an air stream, the fan heat into the conditional space is equal to the electrical power input. I am trying to understand this concept. If the electrical power input is 10W, then

say, 1 W goes to heat as motor loss, and
9 W goes to produce the flow at certain velocity. However, `some` energy turns into heat due to the friction from the fan blade.

As the air stream is still moving, why all the energy become heat input into the space.

thanks

Turbineblade

 

[willard3]

>>>>>>>>>>>>>Exergy (availability) will be converted to entropy irreversibly. This one rule will literally explain all HVAC questions.


The second law of thermodynamics.