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AC Varible Orifice Valve

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Old 06-14-2006, 09:14 AM   #1
Tom Piper
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Default AC Variable Orifice Valve

Here is an interesting three part article on the newer "variable orifice valves" (VOV) -- it is somewhat technical, but good information.

These valves are a drop-in change for the existing fixed orifice valves in most automotive AC systems.

http://www.imcool.com/articles/aircondition/VOV1.htm


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Last edited by Tom Piper; 06-14-2006 at 09:23 AM.
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Old 06-14-2006, 11:26 AM   #2
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They've been out for at least a year. I remember reading about them last summer when I was doing some A/C repair work on my Vette.
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Old 06-14-2006, 12:01 PM   #3
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Most of the pros on the Board at www.ackits.com say they're junk. Don't know of any OEM that uses them either. GM's variable displacement compressor (here's a brief overview: http://www.findarticles.com/p/articl...4/ai_n13780360 ) approaches it from a somewhat different angle, but of all the systems I've owned, that's been the only one that never gave me any problems (and it's nice to have something that never cycles).
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Old 06-14-2006, 12:34 PM   #4
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IT would be neat to see some sort of modern safer version of a lithium bromide ac used on auto's to make use of all the waste heat.
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Old 06-14-2006, 01:10 PM   #5
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Quote:
Originally Posted by Alvin
IT would be neat to see some sort of modern safer version of a lithium bromide ac used on auto's to make use of all the waste heat.
You lost me - doesn't that stuff boil at 2500 degrees? I don't know how you would turn that into cold air unless you use the steam to spin the compressor??? Current designs is to remove the compressor from the accessory drive train - I think the hybrids all ready do - add a super capacitor to run it and maybe you've saved something - though the future promises 16 to 32 volt systems instead.
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Old 06-14-2006, 01:29 PM   #6
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Look up lithium bromide, ice from fire, or adsorbtion cycle refrigerators and you'll find a bunch of info. They have been around for along time. The problem is it could blind someone.

We did a few projects where we where able to run a fairly nice sized adsorbtion cycle refrigerator off the exhaust of a typical household gas water heater.
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Old 06-16-2006, 11:46 AM   #7
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See my post under the "134 Super" title. It's been about 3 years since I installed a varible orifice tube. I did it at the same time of the Freeze 12 conversion, so I don't know how it relates to the final performance of the system but I couldn't be happier. Many thanks to Sun CR for the guidence in getting the system going, but note he wasn't the one who recommended the Freeze 12.
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