Re: ~ long fogging and AC (was: Re: 1st Snow in My A4 (1/2 long))

["JACK & LINDA GROUELL" <grouells@gte.net>]

So, what you are saying is: don't exhail in conditions where your windows
are fogging?

Also, I'm running 11 strands of 100 lights on my tree this year, should I
be going through a relay?  Would I be better off with a single "Xenarc"?  
                     |        Jack Grouell
                     |        90 90 cq (46k miles -  Black)
               ----/"\----  Everett Wa.
 ===O==O= ( o )=O==O===
                   """""

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> From: Dan Masi <dan_masi@MENTORG.COM>
> To: quattro@coimbra.ans.net
> Subject: Re: ~ long fogging and AC (was:  Re: 1st Snow in My A4 (1/2
long))
> Date: Wednesday, December 11, 1996 8:39 AM
> 
> On Dec 11, 10:16am, marriott@Summa4.COM wrote:
> 
> > > Had I been allowed (by Hans und Klaus) to use the AC, the same
> > > air would've been dry.
> >
> > If the outside temp was below ~40F and you were heating the air
> > before you blew it into the car, the air _was_ dry.
> 
> No!  "Dry" is a very relative term here.  First, let's get rid
> of the "heating the air" part, because though heating changes
> the relative humidity, the absolute humitidy (i.e. the amount
> of water in a given volume of air) isn't changed by heating.
> What counts when worried about windshield fogging is the
> relative humidity in the air, but not relative to the air's
> temperature... relative to the *windshield* temp, which will
> be close to the outside air temp!
> 
> OK.  Now, how about an outside air temp of 35F.  Dry?  What if
> it's raining out?  That's 100% relative humidity.  Suck in some
> air.  Call it 80% relative humidity.  At 35F, it takes *very*
> little moisture to reach high relative humidities.  Now breath
> out.  You just added moisture to the air, and since it doesn't
> take much to affect the relative humidity at this low temp,
> blammo, your windshield is fogged.
> 
> > > In every air-conditioned car that I ever owned - a Volvo, a
> > > Nissan, an Isuzu and  my father's Oldsmobile - I could run the
> > > AC at any temperature.
> 
> This is NOT your father's Oldsmobile... :-)
> 
> > I'll bet you could _select_ AC at any temperature, but the
> > compressor wouldn't run at 5  F. That's the way the AC cars I've
> > had (two non-CC Audis, Subaru, Mercury) worked.
> 
> My experience is that two Hondas, two Nissans, and a Toyota
> would all let me engage the compressor (not just "select" it)
> at low temps.
> 
> Now, will someone please find out what microcontroller is in
> the climate control so we can chip it?!?
> 
> Dan Masi
> '96 A4Q