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Why is extreme, extreme?
- Thread starter squasher
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I thought the R22, R290, R404 etc had to do with the actual chemical compsition, like the actual molecular structure. I haven't taken any chemistry since 1st year though, so this is probably wrong....
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eobard said:
i agree with this as probably the best explenation as to why the word extreme is used.
it could be related to the dangers as others have mentioned which are more than just condensation.
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snvpa said:If this was true than R404a which is not flamable would be more explosive than r290 Propane (highly flammable).
Talking to my coworker who has had experience with refridgeration systems in the past, his recollection is the numbering system relates to the flourine, chlorine, and hydrogen atoms. (his experience was with the R numbers under 200.)
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- Apr 15, 2004
the numbers correspond to the number of atoms of each element in the molecules, the letters at the end correspond to the different isotopes if there are any.
First digit on the right = Number of fluorine atoms
Second digit from the right = Number of hydrogen atoms plus one
Third digit from the right = Number of carbon atoms minus one
(not used when equal to zero)
Fourth digit from the right = Number of unsaturated carbon-carbon
bonds in the compound
(not used when equal to zero)
First digit on the right = Number of fluorine atoms
Second digit from the right = Number of hydrogen atoms plus one
Third digit from the right = Number of carbon atoms minus one
(not used when equal to zero)
Fourth digit from the right = Number of unsaturated carbon-carbon
bonds in the compound
(not used when equal to zero)
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Sorry, let me reclarify. That applies for 1-3, and I had it backwards. 1 is the most dangerous, 2 is next, 3 is least.
an "a" at the end means that is a variation of the molecular structure.
an "A" or another capital letter designates a specific proportion for the gasses. (404A is a mixture of several gases)
Hey, I make mistakes, it's okay. I looked it up in the refrigerant hanbook applications program to fix what I said, so sorry about that.
I dissapeared because I have work and I don't always get back to threads. Sorry.
an "a" at the end means that is a variation of the molecular structure.
an "A" or another capital letter designates a specific proportion for the gasses. (404A is a mixture of several gases)
Hey, I make mistakes, it's okay. I looked it up in the refrigerant hanbook applications program to fix what I said, so sorry about that.
I dissapeared because I have work and I don't always get back to threads. Sorry.
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ahhh, now it makes sense.
ethylene is considered quite dangerous, and it's R11xx (i forgot the last 2 #'s)
ethylene is considered quite dangerous, and it's R11xx (i forgot the last 2 #'s)
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blinky said:
Small nitpick: Isotopes are for elements, not chemicals or molecules.
More explanation:
0=methane series. ex. r12, r.22
1=ethane series. ex. 134a
2=propane 290
3=?
4=zeotropic
5=azeotropic
6=organic
7=inorganic
11=unsaturated ethane (ethylene)
12=unsaturated propane (propylene)
Also some corrections
1st number= #Carbon
2nd number=#Hydrogen
3rd number=#Fluorine
? Not sure if that is correct, methane is CH4.
Information from Refrigerant Applications Handbook
Might be worth making a sticky on this.
Last edited:
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Im with some of the others. Its considered extreme because it goes well beyond what is considered normal or necessary cooling. Sort of like extreme scootering and the likes.
AC
AC
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