On Tue, 18 Dec 2001, Peter Bruce wrote:

> I have just read the article in Sky and Telescope (JAN) regarding
> Thermal Management. This seems a great system but it is a shame no
> mention was made of how long the mirror stayed clean, or if the air
> moving over the mirror surface prevents / increases condensation.

I don;t know about the dusting (though you can surely add some kind of
filter to the fan intake), but the airflow will certainly decrease the
chances of condesation on the mirror. The fan works as a cooler when the
mirror is warmer than the surrounding air; when the mirror gets cooler
that the air (by radiative cooling), the fan will actually warm it up.


Radu

> I would also have liked to have seen some more pictures instead of a graph.
> A very interesting article but not something you could do with an SCT.
> What do others think.
> PETER BRUCE.
>

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Radu Corlan Snail Mail: Bucuresti sect. 1,

You can still escape the "Gates" of Hell!
Use Linux!
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