[TheForge] OT Anyone out there knowledgeable about automobile air conditioners and/or 12VDC motors?

[wmullett at bright.net]

This would not make sense in a car over say an 8 hour work day.  Cars have very little insulation so they heat up / cool down rather quickly.  But something like this could effectively pre-cool a vehicle in 20-30 minutes, maybe working off a timer or remote.

---- Original message ----
>Date: Wed, 5 Sep 2012 07:39:04 -0400
>From: theforge-bounces at mailman.qth.net (on behalf of "Bruce ." <freemab222 at gmail.com>)
>Subject: [TheForge] OT Anyone out there knowledgeable about automobile air conditioners and/or 12VDC motors?  
>To: Blacksmithing List Sponsored by ABANA <theforge at mailman.qth.net>
>
>I'm asking this here because of the diversity of knowledge of the
>participants in this forum.We can take this discussion off-line.
>Please respond to me directly at freemab222 at gmail.com .
>
>Did you see this:
>http://www.nypost.com/p/news/local/hizzoner_cold_feat_lYxDIMuat7x4PL7nUbdBEM
>?
>
>Well, that just struck me as dumb -- attaching a 120VAC window A/C to
>pre-cool a car.  But then I noticed that some (or maybe ALL?) RV's
>have "window-style" 120VAC A/C's mounted on them and I got to
>wondering about it.  Of course, these RV's typically are parked at a
>120VAC electrical hookup when not being driven, so the 120VAC A/C is
>the simplest solution.  But what about for remote use?  Say, a person
>who works out of his car in hot weather and finds he only has the
>choice of running the engine or sweltering?
>
>It seems to me that one could use the engine-driven A/C unit of a
>vehicle to cool the vehicle without running the engine.  You'd need an
>extra (12V?) motor to drive the compressor and you'd need a fan -- the
>electric radiator fan might work -- to blow air over the A/C heat
>exchanger.  You'd have to use the motor to drive the compressor.
>
>As I understand it, a car A/C already has a slip-clutch on its
>compressor pulley so that the compressor only runs when called upon to
>do so.  Maybe the motor could be mounted directly to the compressor
>shaft.  Or perhaps there's a better way, maybe involving a double
>pulley or something..
>
>Does this sound feasible?
>
>Ignore for the moment space constraints -- like where could you FIT
>the electric motor.  Also ignore power constraints -- like, how
>quickly would the electric motor driving the compressor run the
>battery down.  Those obviously are issues, but they're secondary to
>the question.
>
>Anyone?
>
>-- 
>Bruce
>NJ
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