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View Poll Results: Would you use a flammable refrigerant?
I'd consider it 16 84.21%
No way! 3 15.79%
Voters: 19. You may not vote on this poll

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Old 06-05-2019, 04:34 PM   #61 (permalink)
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It already cycles on and off.

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Old 06-05-2019, 04:39 PM   #62 (permalink)
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I've heard it said before that R12 was a more efficient refrigerant than R134a, but was eliminated due to the ozone depleting CFCs. As far as I was able to research, efficiency is measured as COP (coefficient of performance), and R134a has a higher COP (better).

Anyone know which is more efficient? If R134a is more efficient, why was R12 ever used in the first place?
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Old 06-06-2019, 10:31 AM   #63 (permalink)
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Because it was cheaper to use and install, used a "normal" lube oil not a synthetic and worked well enough. 134 and its variants were designed after the ozone hole.
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Old 06-06-2019, 11:07 AM   #64 (permalink)
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Quote:
Originally Posted by redpoint5 View Post
I've heard it said before that R12 was a more efficient refrigerant than R134a, but was eliminated due to the ozone depleting CFCs. As far as I was able to research, efficiency is measured as COP (coefficient of performance), and R134a has a higher COP (better).

Anyone know which is more efficient? If R134a is more efficient, why was R12 ever used in the first place?
R12 works with simple mineral oil. IIRC R134a requires synthetic POE oil (which can replace mineral oil in R12 systems, too)... so I'd guess it was a problem of first practically usable discovery.
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Old 06-06-2019, 12:03 PM   #65 (permalink)
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The hole in the ozone is still there and bigger than ever.
It's more than likely always been there.
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Old 06-06-2019, 12:41 PM   #66 (permalink)
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I have ordered some cheapo misting nozzles. I will install them on the front bumper spraying on the condenser and maybe the compressor head to give the AC system a boost in efficiency.

I have also been logging the intake temperature of my TDI. Usually the intake temperature is a few degrees C higher than ambient temperature. When the AC is switched on, the temp goes up 10-15 degs C above ambient.

Hot air is not good for the diesel either, I am hoping this misting will be able to cool things down without consuming a tonne of water.

Something that resembles this:
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Old 06-06-2019, 12:43 PM   #67 (permalink)
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Come to think of it, if it was a gasoline car, making a hot air intake over it would be a good idea.
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Old 06-06-2019, 01:09 PM   #68 (permalink)
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Video of the results:

https://youtu.be/O0MY0diHo4U

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