Quote:
Originally Posted by oil pan 4
Its looking like with the 50/50 CO2/R-404a mixture I am getting almost a 1psi change for every 10°F in temperature change.
I did a test like this on tires if purged and filled my self with 95% nitrogen back in 2006 and saw something like a 1.5 psi change for every 20°F change.
So the CO2/R-404a mixture only changes pressure with temperature slightly more than nitrogen. Nitrogen according to some people doesn't change pressure as it heats up. 
http://ecomodder.com/forum/showthrea...tml#post255838 |
Yes, some folks believe that old wive's tale.
But I disagree about the gases behaving differently.
The Ideal Gas Law predicts a 12°F change for every psi change, and 18°F for 1 1/2 psi. Looks like good correlation there for the data you are getting regardless of the gas. (Keeping in mind you are only able to measure the pressure to 1/2 a psi.)