Limited cooling space

[Gary Derian]

Certainly, the higher the delta T the higher the heat rejection.  It seems
to me that its the same with a tall/narrow or low/wide of equal area.

Gary Derian <gderian at oh.verio.com>

> Frederic Breitwieser wrote:
> >
> > > The way I see it, the coolant now "sees" a radiator that is 1/3 as
high and
> > > 3 times longer.  Why does this cool better than normal.  The log delta
T is
> > > the same, no?  Is it a flow turbulence thing?  That is the only change
I
> > > see.
> >
> > Here would be my <cough> guess...
> >
> > If you increase the width of the radiator, the coolant has to move
> > further to reach the other side and be sucked back into the system,
> > therefore its exposed to the ambient (and hopefully cooler) air
> > temperature, which reduces the temperature of the coolant going back
> > in.
>
> But, heat lost is proportional to the temperature delta.  As the water
> passes through this longer radiator you dump less and less heat because
> the temp delta is getting closer to zero.  Maybe Gary can weigh in here
> but I think you want the radiator at the highest possible average
> temperature to maximize heat transfer.  That situation is achieved by
> the "parallel" radiator, not the serial radiator.
>
>
> --steve
>
> --
> Steve Ravet
> steve.ravet at arm.com
> Advanced Risc Machines, Inc.
> www.arm.com