[ausev] Honda Civic AC compressor
Dan Petit
dan-petit at att.net
Mon Feb 16 23:23:49 GMT 2009
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> 1. Re: Electric AC maintaining cool in a Civic (William Gooch)
> 2. Re: No, I doubt it, more likely an Exxon one. (Dan Petit)
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From Dan Petit Monday Feb 16th,
I stopped by to see my friend at Howdy Honda Service Dept. He
let me review the service manual on the Civic HVAC. The pump
you may be referring to in that same flow-chart is an electric
coolant pump. It moves the coolant out of the radiator and cylinder
head so that excessive latent heat does not build up in either. (The
condenser air discharge can actually get the coolant mixture hot before
it needs to go back to the engine, and the coolant in the head when
not circulating can allow too much latent heat to accumulate in the head.).
There were no published specs as to BTU's nor wattage consumption of
the electrically-driven side of the dual mode compressor.
However, when following the flow chart and reading the overall number
of co-variables in its operation, it is clear that this system has
extremely close operational tolerances and thus is not at all
appropriate for anything else.
Dan Petit.
> Message: 1
> Date: Sat, 14 Feb 2009 09:52:45 -0600
> From: William Gooch <goochb at alum.mit.edu>
> Subject: Re: [ausev] Electric AC maintaining cool in a Civic
> To: ausev at austinev.org
> Message-ID: <4996E8CD.6030308 at alum.mit.edu>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Although I like the concept, from what I've now read about it in
> follow-up to your suggestion, I think the Honda system would be
> difficult to incorporate for a couple of reasons. The main issue is
> that there are two separate compressors in that system - a mechanical
> scroll pump connected to the ICE, and a small electric pump in another
> part of the car - and the controller for the pair appears to be
> moderately complex. Apparently neither compressor by itself is capable
> of fully cooling the car in hot conditions, and hence the ICE sometimes
> runs strictly to turn the mechanical compressor for cooling purposes.
> So I think the electronics of the controller and sensors from the Honda
> would be critical components in such a setup. Overall the cost of both
> compressors plus those electronics might not be a lot less than the
> electric Masterflux system, and the complexity of installation,
> operation and maintenance for the Honda setup is likely to be much
> greater. A second issue is that my intention is to run a 120V traction
> system at least initially, and the electric compressor in the Honda is
> 144V (it may perhaps work at 120V as well, but I'm not sure).
>
> In a 144V system, it seems possible that the electric compressor from
> the larger Honda Accord hybrid might be able to adequately cool a
> smaller car like my MR2 without help from a mechanical pump. This could
> be a good way to reduce the cost of converting to all-electric AC for
> some projects, if it works well and if you can find the parts - I've
> found the mechanical compressor available on the web, but not the
> electric one.
>
> Bill
>
> ausev-request at austinev.org <http://www.austinev.org/mailman/listinfo/ausev> wrote:
> /
> /
>
> Dan Petit Wednesday Feb 11, 7:12 PM.
> The reasons I believe it to be worthwhile to investigate the dual
> scroll Honda Mechanical/Electric compressor is because the Mechanical
> side purges the built-up heat and the electric side maintains the
> comfort level. Running the mechanical side off the other side of the
> traction motor momentarily will not greatly tax the pack. As well,
> the opportunity for A/C regenerative braking is the more efficient use
> of latent energy to slow the vehicle down. (This would offset the
> slower air flow into the condenser to a great extent once the
> vehicle is
> stopped for awhile at a traffic light.) In addition, software could
> keep even the electrical side from operating at 100 percent pulse-width
> during accelerations.
> The design is calibrated for the interior volume of a Civic of course,
> but most EV conversions are approximately the same interior volume.
> Dan Petit
>
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> Message: 2
> Date: Sat, 14 Feb 2009 17:00:26 -0600
> From: Dan Petit <dan-petit at att.net>
> Subject: Re: [ausev] No, I doubt it, more likely an Exxon one.
> To: ausev at austinev.org
> Message-ID: <49974D0A.1040100 at att.net>
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> ausev-request at austinev.org wrote:
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>> Date: Fri, 13 Feb 2009 10:09:48 -0600
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>> Subject: [ausev] TESLA ROADSTER
>> To: AustinEV News Announcements and General Discussion
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>> So,... Did a texaco truck pull in front of the Tesla and drop a barrel of
>> oil in front of it just so they could get it off the road? Then we couldn't
>> have the pleasure of admiring it in our meetings???
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>> Date: Fri, 13 Feb 2009 14:14:35 -0600
>> From: "R. D. Childers" <rdchilders at austin.rr.com>
>> Subject: [ausev] New to me technology
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>> http://www.designnews.com/article/46888-Electric_Motor_Breaks_New_Ground.php
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