[Vwdiesel] AC with propane

[Tad]

Loren - I'm sure we both know better, but since you brought it up -
The common term was changed to 'climate change' because 'global warming' is
a gross oversimplification of the theory and prone to misinterpretation.
 It's the *average* temperature that is increasing, which results in greater
extremes (both high and low) and localized variations in weather patterns of
all kinds.  And I don't know what's been happening where you are, but 'round
these parts we've had record heat for something like 7 or 8 of the last 10
years.

You're right that there's not much talk about ozone depletion lately in the
mass media, and that's really a statement about the media more than it is
about atmospheric science.  Perhaps it has something to do with the fact
that we've 'fixed' the cause of problem (more or less), now we just have to
sit back and wait 50 years or so for the damage already done to work itself
out.

I see what you're getting at regarding ozone and sunlight during Antarctic
spring, however you seem to be missing the point that it didn't start
happening until we dumped a load of ozone-destroying catalysts into the air.
 No coincidence.

Last thing - memory starts to play tricks on you as you get older... I
learned that lesson just a few days ago when I was talking to a coworker
about a mutual friend of ours.  He asked how I knew her and I replied that I
had dated her older sister about 15 years ago.  Well as it turns out, she
doesn't have an older sister! :)  So how do I know her, and who was that
girl I dated?  Beats me...

What's my point?  Elimination of CFCs had zip, zilch, zero to do with
'global cooling' (or warming for that matter).  It was only due to the
catalytic role that CFCs play in the destruction of ozone in the upper
atmosphere.

In fact, 'global cooling' was *never* a commonly accepted scientific
hypothesis (which climate change *is*) - it was just a misinterpretation (by
the media and public, not the scientific community) of a general cooling
trend that was in effect from the mid-40s through the mid-70s(which, as it
turns out, was largely due to changes 'albedo' - reduction in solar warming
due to man-made particulates, soot, etc in the air).

If you're interested, Wikipedia has a great summary of both topics:

http://en.wikipedia.org/wiki/Ozone_depletion
http://en.wikipedia.org/wiki/Global_cooling

Tad

On Sat, Jun 6, 2009 at 9:02 AM, <LBaird119 at aol.com> wrote:

> In a message dated 6/5/2009 8:56:58 PM Pacific Daylight Time,
> toensing at wildblue.net writes:
>
> > started phase out R-12 freon because the experts said it was causing a
> > growing hole in the ozone over Antarctica &Australia
>
>
>   Anybody notice since the new "religion" became "global warming"
> which is now being renamed "climate change" due to the lack of
> warming temps for several years now, that there's been NO mention
> of the "ozone hole"??  Of course nobody seems to remember that
> about 15 years ago we had to stop using CFC produced styrofoam
> and aerosol cans because it was causing global cooling!
>  Ozone (O3)is unstable and self destructs. It's created when high
> energy particles (sunlight) strike the atmosphere.  The "hole" was
> always in panic size every antarctic Spring, which just happens to
> be after several months of very little sunshine... coincidence I guess.
> ;-)
>
>  I talked to an engineer (not sure in which field) several years ago
> about propane refrigerant.  The characteristics are very close to
> R-12 for temps and pressures.  As for fire hazard, most people are
> running around with a dozen or more gallons of gasoline and think
> nothing of it but freak out at the thought of a pound of propane
> in the A/C!  There's NO air in the system unlike a gas tank.  This
> guy said the Stoichiometric requirements of propane are MUCH more
> narrow than with gas.  As he put it, if you do spring a leak, the odds
> are much more in your favor it'll just leak out.  Too fast and it'll
> be too rich to burn, leak too slow and it'll be too lean.  Just right
> and you'll have a short term blow torch but those odds are really
> small.  Much better odds your fuel line will already be burning.  Get
> a leak inside and you'll know it unlike with R-12.
>     Loren
>
>
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