[ausev] A/C in an EV

[csorenson1 at austin.rr.com]

Well this looks "cool."  I sent them an email and left a phone message.  We
will see what they say.  Thanks

Original Message:
-----------------
From: Mike Delany mike at p1800s.com
Date: Thu, 14 Jun 2007 11:22:05 -0500 (CDT)
To: chris at ohmbre.org, ausev at austinev.org
Subject: Re: [ausev] A/C in an EV


Has anyone talked to these people http://www.wagners12voltair.com/ , they 
are claiming that they have golfcart DC powered systems that would 
probably do a decent job of cooling a car (especially if it was white and 
the windows were tinted).

Mike

Certified heathen and reformed pacifist

http://www.p1800s.com

On Wed, 13 Jun 2007, Christopher Robison wrote:

> On Tue, June 12, 2007 9:06 pm, Claire Sorenson wrote:
>> Gary, thanks for the tip.  I think this is the best A/C alternative I
have
>> seen so far. I was looking for something portable and enviro-friendly. 
It
>> may seem expensive, but probably no more than retrofitting motors, and
>> evaporators, and compressors, fans etc.
>
> The difference is that doing the latter will give you a system you'll be
> happy with for a long time. The costs can't really be directly compared,
> because what you're getting is so different.
>
> A few people have tried icewater air conditioning, including Mark Kapner
> who did it for a while in his Geo, and I briefly experimented with my own
> hacked together version a few years ago when I was without A/C in my
> Civic. In general, most people who try this find the experience
> interesting but dissatisfying.
>
> First, although it seems fun in the beginning, you soon realize: that's a
> lot of ice. And when you get where you're going, you now have a lot of
> *water* to get rid of. That much water is really heavy, and it sloshes
> around in the cooler, making it difficult to handle. You're not going to
> want to carry that water very far, so you're probably going to dump it on
> the parking lot. Be careful not to slosh it on your upholstery or yourself
> -- ice chest lids don't seal well. A related issue is, where do you get
> all that ice?  I recall that Kapner got it from the office ice machine; I
> wasn't so lucky and had to use what little ice my freezer could produce.
> Dealing with this every day gets to be a hassle after the novelty wears
> off.
>
> Second, it's just not really that effective at cooling. I don't know
> exactly how cold the evaporator of an automotive A/C gets, but I'll bet
> it's a bit colder than ice water. At any rate, the chilled water only
> remains at icewater temperatures part way through the radiator warming up
> as it goes, whereas in an A/C evaporator, you've got that refrigerant
> phase change helping to absorb more heat.
>
> For maybe twenty bucks in parts, I didn't feel like I'd lost much; it was
> an interesting experiment and I got what I paid for. Maybe this guy has
> built a more effective design, but I don't think there's any way in the
> world he could improve it enough to be worth a fourth of what he's asking.
>
> Feel free to try this, but don't expect that you'll be happy with it for
> long -- spend accordingly.
>
>
>
> -- 
> Christopher Robison
> chris at ohmbre.org
> http://ohmbre.org          <-- 1999 Isuzu Hombre + Z2K + Warp13!
>
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> AusEV at austinev.org
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>
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