Subject	Cooling efficiency in coverted a/c systems
Posted by	JMartz on September 12, 2012 at 8:31 AM
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Message	As a chemist, I have always been reluctant to believe claims that a/c conversions from R12 to R134a actually work. Aside from the "O-ring" incompatibility, R134a gets hotter on compression and essentially as cold on expansion. The final temperature after expansion depends on the initial temperature after compression. A/c systems have a cooling radiator to reduce this compression induced heat called the condenser. The picture below (posted earlier by a fellow member) shows that the R134a has more area to handle a hotter fluid. This is the 1st time I actually see a factory difference between the 2 systems. R12 was a far better cooler in traffic. R134a systems do ok when the car is running and the condenser is well ventilated. Its a shame the industry was forced to change to a less efficient refrigerant.
Follow Ups	Cooling efficiency in coverted a/c systems - JMartz 08:31:53 09/12/12 Heh, nice to see my pic gettin around. :) (n/m) - SkiFly01 08:48:01 09/12/12 A shame indeed. Who needs an ozone layer. (n/m) - Summeronthechain (MN) 09:12:59 09/12/12 2nd, as a chemist, the op should have a clear understanding - TriniTT 09:24:32 09/12/12 I've heard that r134A is on the way out - Shiers69 10:10:38 09/12/12 Correct, its called HFO-1234yf - RobZ32 10:22:58 09/12/12 Had to click link to believe you - BlackholeZ 11:03:26 09/12/12 I wonder what its physical properties are. (n/m) - JMartz 19:34:28 09/13/12 Just another challenge to the automotive engineers - Barry(TN) 10:31:47 09/12/12 Trini, beware of what the government tells you. - JMartz 19:38:38 09/13/12 Profile says artist (n/m) - Ted (92TT) 10:19:58 09/12/12 New carrer after cancer. (n/m) - JMartz 19:33:28 09/13/12 10 years ago, my R12 system was optimum and after converting - zQuikonE 12:47:04 09/12/12 Thanks for your honesty. (n/m) - JMartz 19:39:46 09/13/12 Re: Cooling efficiency in coverted a/c systems - KA8 13:18:36 09/12/12 Don't you'll hate it. - JMartz 19:43:11 09/13/12 How long before HFO-1234yf? - NytWolf 15:40:06 09/12/12
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