Page 368 - Applied Process Design For Chemical And Petrochemical Plants Volume III

66131_Ludwig_CH11A 5/30/2001 4:50 PM Page 325

Refrigeration Systems 325

Table 11-6 (continued)
®
Genetron CFC and HCFC Types of Refrigerants Indicating Substitution “Phasing-Out” of Selected Compounds
with Newer Replacement Compounds

Chlorodifluoro- Pentafluoroethane Azeotropic Mixture Chlorotrifluoro- Trifluoromethane Azeotrope Azeotrope
methane (CHF 2 CF 3 ) (CH 2 F 2 /CHF 2 CF 3 ) methane (CCIF 3 ) (CHF 3 ) (CHF 3 /CCIF 3 ) Trifluoromethane
Pentafluoroethane A candidate substi- AZ-20 is an A specialty low- A specialty low- An azeotropic mix- Hexafluoroethane
Propane tute for use in low azeotropic mixture temperature refrig- temperature refrig- ture used in the low (CHF 3 /C 2 F 6 ) A non-
(CHCIF 2 /CHF 2 CF 3 / temperature refrig- of HFC-32 and erant used in the erant that may be stage of cascade ozone-depleting
C 3 H 8 ) erant applications. HFC-125. It has low stage of cascade used to replace type systems where azeotrope of HFC-
An interim Low critical temper- been designed to systems to provide CFC-13 and R-503 it provides gains in 23 and FC-116 used
replacement for ature may limit use replace HCFC-22 in evaporator tempera- in the low stage of compressor capacity to replace CFC-13
retrofitting low- as a stand-alone air conditioning tures in the range of cascade systems. in low-temperature and R-503 in the
and medium- fluid. and refrigeration 75°C. capability. low stage of cascade
temperature applications. systems.
commercial refrig-
eration systems.

Azeotropic
pe Blend HFC Mixture CFC HFC Azeotrope Azeotrope
0 HP80 125 AZ-20 13 23 503 508B

R-402A R-125 R-410A R-13 R-23 R-503 R-508B
101.6 120.0 72.6 104.5 70.0 87.5 95.4
1 54.8 55.8 62.9 114.6 115.7 126.1 126.9
153 — 247 294 247 — —
168.3 151 163 84 78 67 57.2
615.0 525 720 561 701 632 568.5
69.3 72.3 64.8 82.4 74.7 78.5 81.12
0.33 0.35 0.41 0.24 0.33 0.28 0.32
0.18 0.19 0.21 0.13 0.16 0.14 0.16
None None None None None None None
A1/A1 N.C.††† A1/A1 A1 N.C.††† N.C.††† A1/A1
NOTE: AZ-20 is NOTE: 503 is an NOTE: 508B is
an azeotropic azeotropic an azeotrope of
mixture mixture HFC-23 (CHF 3 ),
consisting of consisting of 46% by weight
HFC-32 (CH 2 F 2 ), HFC-23 (CHF 3 ), and FC-116
50% by weight 40.1% by weight (C 2 F 6 ), 54% by
and HFC-125 and CFC-13 weight.
(CHF 2 CF 3 ), 50% (CCIF 3 ), 59.9%
by weight. U.S. by weight. U.S.
Patent 4,978,467 Patent 3,640,869
AlliedSignal Inc. Allied Chemical
European Patent Corp.
533,673