Re: HP drawn by the power steering pump.

[evangelo@mecf.wustl.edu]

>Pressure-volume work = P*delta V.  If the fluid is imcompressible then
>delta V = 0 and P*delta V also = 0.
>Boy do I not miss those days from 1957-58!  Work compressing the fluid = 0.

hey, not so fast ...
You are neglecting temperature. 
Say that you have a bucket of fluid. If you compress it from the top,
(assuming incompressible fluid) the temperature will rise -> work.
Also the increase in the speed of the fluid (for a pump) -> more work.

I don't know which ones are the significant phenomena here.

Isn't it easier just to pull the pump out and read the rating :^).

Evangelos

PS.
oh, I forgot, the thing works with pistons ...