Quote:
Originally Posted by Matt L
Look at the temperature-pressure curves of each material, as well as the critical temperature. Propane alone will give you too much head pressure. If your system were designed for propane, it would work not just good but great.
Hardware-store propane is pretty wet. Your grill doesn't care about a bit of water in the fuel.
Regardless of what the Duracool and Enviro-Safe makers say, moisture inside your AC system is indeed bad. And as for the instructions to let AIR into the system (or not pull a complete vacuum, which is the same thing), well I just think that's silly.
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When you're talking about excessively high head pressures, you're not figuring into the equation that you use
significantly less hydrocarbon refrigerant than you would R134.
So you'd be right, if you would actually use 2lbs of propane to replace 2lbs of R134. But you don't. You only use .5lb or so. The pressures aren't an issue, because of the reduced volume allowable by propane's higher efficiency. It's a total non-issue. Your actual head pressures with hydrocarbons will actually turn out to be significantly lower than with R134a.