Mirror cooling stage III

davidpretorius · #1 02-12-2005, 10:21 PM

Ok, it looks like it works, with no fan, the ambient is dropping at an average 2.0 to 2.2 degrees per hour, the mirror in this same time, cooled at a rate of 1.657.

when the fan was switched on to suck, the ambient had slowed to 1.9 degrees per hour, but the mirror cooled at 2.2 degrees per hour.

Well I spose we have two issues with the fan on the side of the tube, the boundary layer is being interupted and sucked out and also the mirror is being cooled at roughly 2 degrees per hour. I would imagine that if the temp was falling faster then the mirror would also fall faster.

Anyway i am happy with this little experiment.

It can be put to bed for a little while. The motors are coming for driving the dob!!!! - yay!

ballaratdragons (Ken) · #2 02-12-2005, 10:48 PM

Davo, would be interesting to park an un-fanned identical Dob next to yours and do a comparison. Any other 10" Dobs near you?

davidpretorius · #3 02-12-2005, 10:55 PM

dave 47 fluff was the closest i reckon, it probably geoff now!!!

there are some 8".

I have just finished for the night. clouds have come in.

ambient levelled at 19.2 and the fan kept driving it to 19.6 when I switched it off.

so, the fan has kept it within 1 degree of the falling ambient and when it levelled, aprox 1/2 hr, was within .5 of a degree.

very happy! A bigger fan may be in order down the track!

ballaratdragons (Ken) · #4 02-12-2005, 11:04 PM

So, the rain is heading for the Australian Capital Launceston after all!

davidpretorius · #5 02-12-2005, 11:33 PM

yup, an early night and no getting up for saturn!!

good night all.

ballaratdragons (Ken) · #6 02-12-2005, 11:42 PM

night night Davo.

h0ughy (David) · #7 02-12-2005, 11:45 PM

Quote:

Originally Posted by davidpretorius

yup, an early night and no getting up for saturn!!

good night all.

enjoy your Saturn hunt!!!