RE: [ATM] Forced Ventilation

["Doug Williams" <salguod@minbaritm.com>]

Bill,

I think that we are quite properly fixated on cooling the mirror!  Cooling
the mirror to ambient is still the ultimate goal, and Alan Adler clearly
stated so in his article.  Breaking up the turbulence works only when the
mirror is close to ambient anyway.  Alan Adler's methods are designed to
break up the boundary layer WHILE cooling the mirror.  I don't think that we
can just ignore the mirror cooling issue because we blew the boundary layer
away.  Remember that if the mirror is at ambient temperature, there is no
boundary layer in the first place!  Nothing Adler wrote disputes this basic
fact.

Doug

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Bill Kelley
Sent: Monday, January 31, 2005 4:38 PM
To: Don Clement; atm@atmlist.net
Subject: Re: [ATM] Forced Ventilation


This was the thrust of Alan Adler's S&T article. Break up the turbulence and

it doesn't matter. Surprising how many are still fixated on cooling the 
mirror. The evening temperature can always drop faster than mirrror cooling 
can keep up.
Bill Kelley

----- Original Message ----- 
From: "Don Clement" <clement.focuser@verizon.net>
To: <atm@atmlist.net>
Sent: Monday, January 31, 2005 9:12 AM
Subject: Re: [ATM] Forced Ventilation


> What about the idea of homogenizing thermal layers in front of the mirror 
> by
> forcing air across the front of the primary mirror in an open or closed
> support structure?
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>
> 


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