Gas blends - not seen this in a sticky so asking

MeltedDuron · 10-08-2009, 08:14 AM

Not sure on this, Google showed me nothing and nothing in a sticky here so thought i'd ask.

Do you blend gases that have a simular boiling point, so after XX meters of cap or what ever the metering device is the 2 or more gases are boiling off at the same time. The reason for the 2 is they hold different amounts of load at there temps and the mix of the two creats one single charge of two gases that can hold a lot of load at a decent temp?

Sorry but im confused on this

tiborrr · 10-09-2009, 04:19 AM

Depends on wheter the blend is azotropic or zeotropic. It may form a blend which makes for a 'new' refrigerant with a p-T charactheristics of it's own or simply two refrigerants which boils off separately, the lower pressure refrigerant boiling off before the higher pressure refrigerant. This is a so-called blend with a temperature 'glide' (best example would be R-407C which has 7°C glide - the refrigerant boils at 7°C colder temperatures at the end of the evaporator than at the start).

Blending D-I-Y makes for nearly impossible superheat & subcooling measurement so we tend to avoid it when we can

wdrzal · 10-09-2009, 08:34 PM

Here's a online list of ASHRAE refrigerants:

http://www.ashrae.org/technology/page/1933

Refrigerants

Methane Series
Ethane Series
Ethers
Propane
Cyclic Organic Compounds
Miscellaneous Organic Compounds
Nitrogen Compounds
Inorganic Compounds
Unsaturated Organic Compounds
Refrigerant Blends

Zeotropes
Azeotropes

--------------------------------------------------------------------------------

Refrigerants
Number Chemical Name Chemical Formula
Methane Series
11 trichlorofluoromethane CCl 3F
12 dichlorodifluoromethane CCl 2F 2
12B1 bromochlorodifluoromethane CBrClF 2
13 chlorotrifluoromethane CClF 3
13B1 bromotrifluoromethane CBrF 3
14 tetrafluoromethane (carbon tetrafluoride) CF 4
21 dichlorofluoromethane CHCl 2F
22 chlorodifluoromethane CHClF 2
23 trifluoromethane CHF 3
30 dichloromethane (methylene chloride) CH 2Cl 2
31 chlorofluoromethane CH 2ClF
32 difluoromethane (methylene fluoride) CH 2F 2
40 chloromethane (methyl chloride) CH 3Cl
41 fluoromethane (methyl fluoride) CH 3F
50 methane CH 4

Number Chemical Name Chemical Formula
Ethane Series
113 1,1,2-trichloro-1,2,2-trifluoroethane CCl 2FCClF 2
114 1,2-dichloro-1,1,2,2-tetrafluoromethane CClF 2CClF 2
115 chloropentafluoroethane CClF 2CF 3
116 hexafluoroethane CF 3CF 3
123 2,2-dichloro-1,1,1-trifluoroethane CHCl 2CF 3
124 2-chloro-1,1,1,2-tetrafluoroethane CHClFCF 3
125 pentafluoroethane CHF 2CF 3
134a 1,1,1,2-tetrafluoroethane CH 2FCF 3
141b 1,1-dichloro-1-fluoroethane CH 3CCl 2F
142b 1-chloro-1,1-difluoroethane CH 3CClF 2
143a 1,1,1-trifluoroethane CH 3CF 3
152a 1,1-difluoroethane CH 3CHF 2
170 ethane CH 3CH 3

Number Chemical Name Chemical Formula
Ethers
E170 Dimethyl Ether CH3OCH3

Number Chemical Name Chemical Formula
Propane
218 octafluoropropane CF 3CF 2CF 3
227ea 1,1,1,2,3,3,3-heptafluoropropane CF 3CHFCF 3
236fa 1,1,1,3,3,3-hexafluoropropane CF 3CH 2CF 3
245fa 1,1,1,3,3-pentafluoropropane CHF 2CH 2CF 3
290 propane CH 3CH 2CH 3

Number Chemical Name Chemical Formula
Cyclic Organic Compounds
C318 octafluorocyclobutane -(CF 2) 4-

Miscellaneous Organic Compounds
Number Chemical Name Chemical Formula
hydrocarbons
600 butane CH 3CH 2CH 2CH 3 A3
600a isobutane CH(CH 3) 2CH 3 A3
601 Pentane CH 3CH 2CH 2 CH 2CH 3
601a Isopentane CH(CH 3) 2 CH 2CH 3
oxygen compounds
610 ethyl ether CH 3CH 2 OCH 2CH 3
611 methyl formate HCOOCH 3
sulfur compounds
620 (Reserved for future assignment)

Number Chemical Name Chemical Formula
Nitrogen Compounds
630 methyl amine CH 3NH 2
631 ethyl amine CH 3CH 2(NH 2)

Number Chemical Name Chemical Formula
Inorganic Compounds
702 hydrogen H 2
704 helium He
717 ammonia NH 3
718 water H 2O
720 neon Ne
728 nitrogen N 2
732 oxygen O 2
740 argon Ar
744 carbon dioxide CO 2
744A nitrous oxide N 2O
764 sulfur dioxide SO 2

Number Chemical Name Chemical Formula
Unsaturated Organic Compounds
1150 ethene (ethylene) CH 2=CH 2
1270 propene (propylene) CH 3CH=CH 2

Refrigerant Blends
Number Refrigerant Composition (Mass % )
Zeotropes
400 R-12/114 (must be specified)
(50.0/50.0)
(60.0/40.0)
401A R-22/152a/124 (53.0/13.0/34.0)
401B R-22/152a/124 (61.0/11.0/28.0
401C R-22/152a/124 (33.0/15.0/52.0)
402A R-125/290/22 (60.0/2.0/38.0)
402B R-125/290/22 (38.0/2.0/60.0)
403A R-290/22/218 (5.0/75.0/20.0)
403B R-290/22/218 (5.0/56.0/39.0)
404A R-125/143a/134a (44.0/52.0/4.0)
405A R-22/152a/142b/C318 (45.0/7.0/5.5/42.5)
406A R-22/600a/142b (55.0/4.0/41.0)
407A R-32/125/134a (20.0/40.0/40.0)
407B R-32/125/134a (10.0/70.0/20.0)
407C R-32/125/134a (23.0/25.0/52.0)
407D R-32/125/134a (15.0/15.0/70.0)
407E R-32/125/134a (25.0/15.0/60.0)
408A R-125/143a/22 (7.0/46.0/47.0)
409A R-22/124/142b (60.0/25.0/15.0)
409B R-22/124/142b (65.0/25.0/10.0)
410A R-32/125 (50.0/50.0)
410B R-32/125 (45.0/55.0)
411A R-1270/22/152a) (1.5/87.5/11.0)
411B R-1270/22/152a (3.0/94.0/3.0)
412A R-22/218/143b (70.0/5.0/25.0 k
413A R-218/134a/600a (9.0/88.0/3.0)
414A R-22/124/600a/142b (51.0/28.5/4.0/16.5)
414B R-22/124/600a/142b (50.0/39.0/1.5/9.5)
415A R-22/152a (82.0/18.0)
415B R-22/152a (25.0/75.0)
416A R-134a/124/600 (59.0/39.5/1.5)
417A R-125/134a/600 (46.6/50.0/3.4)
418A R-290/22/152a (1.5/96.0/2.5)
419A R-125/134a/E170 (77.0/19.0/4.0)
420A R-134a/142b (88.0/12.0)
421A R-125/134a (58.0/42.0)
421B R-125/134a (85.0/15.0)
422A R-125/134a/600a (85.1/11.5/3.4)
422B R-125/134a/600a (55.0/42.0/3.0)
422C R-125/134a/600a (82.0/15.0/3.0)
422D R-125/134a/600a (65.1/31.5/3.4)
423A 134a/227ea (52.5/47.5)
424A R-125/134a/600a/600/601a (50.5/47.0/0.9/1.0/0.6)
425A R-32/134a/227ea (18.5/69.5/12)
426A R-125/134a/600/601a (5.1/93.0/1.3/0.6)
427A R-32/125/143a/134a (15.0/25.0/10.0/50.0)
428A R-125/143a/290/600a (77.5/20.0/0.6/1.9)
429A R-E170/152a/600a (60.0/10.0/30.0)
430A R-152a/600a (76.0/24.0)
431A R-290/152a (71.0/29.0)
432A R-1270/E170 (80.0/20.0)
433A R-1270/290 (30.0/70.0)
433B R-1270/290 (5.0/95.0)
433C R-1270/290 (25.0/75.0)
434A R-125/143a/134a/600a
435A R-E170/152a (80.0/20.0)
436A R-290/600a (56.0/44.0)
436B R-290/600a (52.0/48.0)
437A R-125/134a/600/601 (19.5/78.5/1.4/0.6)
438A R-32/125/134a/600/601a (8.5/45.0/44.2/1.7/0.6)

Number Refrigerant Composition (Mass % )
Azeotropes
500 R-12/152a (73.8/26.2)
501 R-22/12 (75.0/25.0)
502 R-22/115 (48.8/51.2)
503 R-23/13 (40.1/59.9)
504 R-32/115 (48.2/51.8)
505 R-12/31 (78.0/22.0)
506 R-31/114 (55.1/44.9)
507A R-125/143a (50.0/50.0)
508A R-23/116 (39.0/61.0)
508B R-23/116 (46.0/54.0)
509A R-22/218 (44.0/56.0)
510A R-E170/600a (88.0/12.0)

MeltedDuron · 10-10-2009, 01:10 AM

Wow, Wdrzal thank you. I'll have a good read over that

gosmeyer · 10-10-2009, 05:55 AM

Dang Walt!!!

teyber · 10-10-2009, 01:32 PM

great post walt, good read