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Old 02-03-2007, 12:51 AM
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davidpretorius
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davidpretorius is offline
 
Join Date: Jun 2005
Location: Launceston Tasmania
Posts: 7,381
Hi Mike,
Bird, Paul and I are all blowing air onto a surface to cool it better. In our cases, we are inserting an aluminium plate, into the equation, connecting it to some peltiers (ie cooling the plate below ambient) and actually using the fan to blow internal air onto this colder plate and then circulating around the mirror. The mirror is then cooling ahead of ambient dropping.

There seems to be marked differences in cooling rates when blowing onto as opposed to sucking away.

Given most times, the air in your tube will always be warmer than ambient (unless doing solar during the day), then blowing colder ambient air into a warmer system is better than trying to suck it out.

I have started a blog http://southcelestialpole.org.au/blo...d=21&blogid=11 This unit is for John K. It will sit on top of his JMI torus. Icemans is next for his 12". He sent me piccies and dimensions of the base of his new 12" today.
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