>I'm glad you folks find my penny tray so damned trick. I love it to.. It
>terms of running the PB on the slab of granite (or tile beit ceramic of
>whathaveyou) obviously the little rubber feet will limit the contact. As
>we know direct conduction of heat from the plastic to the heat sink will be
>much better than if the PBs rubber feet raise it 2mm or so. My penny bed
><http://members.xoom.com/dcretney/penny.html> is such a size that it sits
>right on the platic case of the PB2400. If you are using your own heat
>sink be sure to get as much direct contact as possible.
>
>I am a chemist in training. The tables in front of me show that aluminum
>has about 2.5X's the heat capacity of copper. This means that it will
>require about 2.5X's as much energy to raise its temperature. My
>understanding is that the aluminum will hold more heat and is possibly the
>better conducter of heat. Although speed of conducting the heat and the
>disapating it an a host of other factors will also play a role.
>
>I have been considering increasing the size of my penny bed and leaving a
>depresion for a cooling fan to cool the pennies. However, by PB ispretty
>cool as it is, I have never had it shut down on or off the penny bed so I
>don't think it is necessary.
>
>
>I am pretty sure that car radiator fins were(are?) made of copper. Maybe
>copper is cheaper/easier to form, but possibly the water/copper/air cooling
>sequence is more efficient than if it were aluminum.
>
>dc
>
>
I'm ust a liberal artist (economics), but aren't pennies nowadays made
mostly of zinc with a relatively thin copper coating?
Big Brother is watching. Learn to become invisible.
Steven Appelget
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