[luau] Underclocking / delta T

[Jim Roby]

Also interesting that you don't see copper brake lines,always steel,
even though they rust out.The steel is made to take higher pressure,
and in refrigeration where the coolants use are noctious, the steel,rather
than soft maliable copper provides better security for rupture.
Hawaii building code will make you plumb a gas stove,or refrigerator
with hard GI pipe,untill you get just to the connect point where copper
tube, because it is pliable is used to make the final connect.
And steel is cheaper to boot.
"There are strange thing done neith the midnight sun by the men who
maul for gold" :-)

On Thu, 4 Jul 2002, Joe Linux wrote:

> It is curious though that you almost never see a copper condensing coil 
> on a domestic refrigerator.  They are almost always steel.  They don't 
> even have aluminum or copper fins. Often they just use a matrix of steel 
> wire.   (It is the condensing coil that gives up heat to the ambient 
> air.)  This type of condenser is always a "static" condenser  which has 
> no fan.
> 
> An interesting sidelight now is the comparison of a car with an engine 
> that has an aluminum block to one that has a cast iron block.  Aluminum 
> blocks are lighter, but tend to warp and self distruct when over heated. 
>  A cast iron block is much more forgiving.  Many people who have run out 
> of water going over the Pali have had to have their engines replaced if 
> it has an aluminum block, whereas a cast iron block might even seize up 
> yet run perfectly fine again once it has cooled down.
> 
> Aluminum wiring in houses is generally considered dangerous fire hazard 
> today although it was installed in homes in the past as a cost cutting 
> measure.  Copper is the standard today.
> 
> MonMotha wrote:
> 
> > Steel is probably ons of the worst materials for a heatsink precisely 
> > for the reason you gave: it doesn't move heat well.  For a heatsink, 
> > the objective is to MOVE heat (this is why people with lots of heat to 
> > move LOVE peltiers).
> >
> > Remember, fans actually MAKE heat, but the reason they help cooling is 
> > because they move the air around.  This means that the hot air 
> > resulting from the transfer of heat away from the sink is evacuated 
> > quickly and cool air is brought in.  Again, larger delta T means 
> > faster heat transfer.
> 
> 
> It seems to me that after all this discussion that Wayne should learn to 
> live with his fan as that in fact is the best system.
> 
>