Re: HP drawn by the power steering pump.

["Arun Rao" <rao%frisbee@frisbee.pixar.com>]

On Nov 29, 10:10pm, Robert (Bob) Myers wrote:
> Subject: Re: HP drawn by the power steering pump.
> Gee, all this talk about thermogoddamics is bringing back memories of my
> college days.  Unpleasant memories, at that.
>
> 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.
>
> The work being done is strictly the work being done comporessing the trapped
> air in the pressure accumulator and pushing the hydraulic cylinders around
> plus what is required to overcome friction losses.  This won't amount to
much.

>-- End of excerpt from Robert (Bob) Myers

	Dead on, I believe.  So, whenever power assist is required, the
	accumulator loses a bit of pressure which is replenished by the
	pump, translating to work done by it.  Right?

	-Arun

	PS:  You know, I'm an EE, but I actually *liked* thermo.