The post whore thread.

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Originally Posted by BuffCyclist

Pretty much. If the dew point differential is less than 3degC, we can start getting condensation forming on the mirror and thats not good at all. It's currently at 0.0degC. Dew has been forming for hours, but now that its at 0degC, it'll be forming much faster and we're probably sitting in a fog bank too. Happens often, but when it happens the entire work shift, it really sucks.

Funny thing is, its crystal clear skies right now (well it was). No radar returns, almost no cloud coverage (there are clouds but we could see through them with this instrument as its in the IR). Two more hours though!

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Can't go to Walmart and get a $10 box fan to ventilate that shit? [LOL]

I think this ought to be the "Post Whore Thread....shady as fuck"

:)

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Originally Posted by GilpinGuy

Can't go to Walmart and get a $10 box fan to ventilate that shit? [LOL]

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Oh, our telescope sits out on a pier. We pull the building off of it. Heck, let me get a pic...

Attachment 31759

eta: Thats a really old pic, as it doesn't have the flat field petals, but you get the idea. In short, if we plunge a cold telescope into the warm damp air, we'll get instant condensation no mater how much ventilation we have.

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Originally Posted by Otterbatcat

I think this ought to be the "Post Whore Thread....shady as fuck"

:)

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Just added a new tag...check it below.

We have HUGE ventilation that sucks air down from the top, through the blue A-frame supports that you see there, and away from the telescope about 50-75ft.

That lower enclosure (box below the observing deck) holds all of the computer racks and generate a lot of heat, so that heat is pulled out as well.

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Originally Posted by GilpinGuy

Just added a new tag...check it below.

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There we go! Now, we just have to start using that on various trading post ads [LOL]

OK, two box fans then.... :)

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Originally Posted by BuffCyclist

Oh, our telescope sits out on a pier. We pull the building off of it. Heck, let me get a pic...

http://www.sdss3.org/images/gallery/telescope.jpg

eta: Thats a really old pic, as it doesn't have the flat field petals, but you get the idea. In short, if we plunge a cold telescope into the warm damp air, we'll get instant condensation no mater how much ventilation we have.

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Originally Posted by GilpinGuy

OK, two box fans then.... :)

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Yea, that might do it.

You should try that. Go get a glass of ice cold water when the humidity is high. Point a box fan at it and see if it still forms condensation on the outside... methinks it will.

LOL...I added a tag as well.

Looks like you'll need a few extension cords too.