[luau] Underclocking / delta T

[Joe Linux]

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.

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