134a Refrigerant

Atomic weights? Do you mean the specific gravity of molecular compounds? Here's a list if you are really interested, but it does not really address the issue of atmospheric mixing and the process of diffusion.

I wish I had a nickel for every time I've heard a technician, too lazy to think for himself, whine the tired old litany "But the manual says....."

Well, no s*it Sherlock! EXCEPT the conversation was about CFCs which are MOLECULES! Come on Google boy, what is the atomic weight of Freon-12, and what is it's element number?

Composition of FREON-12: Density (g/cm3) = 1.12000E+00 Mean Excitation Energy (eV) = 143.000000

COMPOSITION:

Atomic number Fraction by weight 6 0.099335 9 0.314247 17 0.586418

Refrigerant R12 (Freon-12-CCl2F2)

R-12 is a very popular refrigerant. It is a colorless, almost odorless liquid with a boiling

point of -29°C at atmospheric pressure. It is nontoxic, noncorrosive, nonirritating and

nonflammable. R-12 has a relatively low latent heat value. In the smaller refrigerating machines, this is an

advantage. The large amount of refrigerant circulated will permit this use of less sensitive and

more positive operating and regulating mechanisms. It is used in reciprocating, rotary and large

centrifugal compressors. It operates at a low but positive head and back pressure and with a

good volumetric efficiency. R-12 ha a pressure 183 kPa at -15°C and a pressure of 745 kPa at 30°C. The latent heat of R-12

at -15°C is 159 J gG 1 (Althouse et al., 1992).

J. Biol. Sci., 3 (12): 1114-1125, 2003

The composition of Freon R-12 is Carbon, Chlorine, and Fluorine

Freon is a *compound*. Bill's pointing out the periodic chart of

F | Cl--C--F | Cl

I knew what Bill meant as did everyone else with one exception.

i didnt say specific gravity. i said atomic weight. look on the table of elements.

what are your specific credentials? if you claim to be within the refrigeration/hvac industry ive gotta question that will tell me if you know your ass from a hole in the ground.

dont be stupid. refrigerant (non brand specific which you should know if youre who you insinuate you are) is made up of those same elements. when even one of them is heavier than air it will sink below it.

WRONG! "freon" is a brand.

Oh, boy... another one. So deforestation's good? Jeeping on the Moon, better than in the forest? It's good to dump crankcase oil in the gutter, or in your backyard? Rivers that burn are better than those that don't? Industry should not be regulated at all? One from the looney bin... __ Steve .

Freon-12, and=20

Just like the argon pool we're drowning in! Help! __ Steve .

Well, he's obviously got you there... since it's a brand, it *can't* be a compound... we all know that. Once you brand it, then the molecules behave differently! __ Steve .

Stephen Cowell did pass the time by typing:

alt.pave.the.earth

Of course. thermal breakdown ;-) I got a paper cut from a xerox. I had to put a bandaid on it after wiping it off with a kleenex.

There are no puddles of dichlordifluoromethane laying around, as there are no puddles of argon, CO2, or O2. How come? All are heavier than the admixture we call "air".

DIFFUSION.

Here is a grade school level page on the subject:

Just like the argon pool we're drowning in! Help! __ Steve .

Well heck, that means I've been wasting all this money on shielding gas for the MIG welder when I needn't have! There's no pesky lighweight oxygen down here on the ground to wreck my welds anyway!!!

/Peter

Did you even take high school chemistry??? There is specific language that has defined and agreed upon meanings. Specific gravity is the correct term when discussing when relative weight of one entity (be it a single atom, a mono atomic molecule, or a compound) in comparison to a standard, in this case "air". This *IS* what you are saying when you state that refrigerants are heavier than air.

I'm one of those engineers that you don't like. Five years of engineering school for my BS, some additional grad school to round things out a bit. Thermodynamics, fluid mechanics, heat transfer in addition to three years each of chemistry and physics.