Operating conditions
SY240 to 380
R407C
at DEW temperature
SZ084 to 185 & SY185
R407C
at DEW temperature
Application envelopes at
mean temperatures
Refrigerant R407C is a zeotropic mixture,
which causes a temperature glide in both the
evaporator and condenser. When discussing
evaporating and condensing temperatures
therefore, it is important to indicate whether
these are DEW point values or MEAN point
values. In the figure below, the dashed lines
reflect constant temperature and do not
correspond with the constant pressure lines. For
a given cycle, the MEAN point temperatures are
typically about 2 to 3°C lower than DEW point
temperatures. In these Selection and Application
Guidelines, Danfoss Commercial Compressors
displays temperatures as DEW point values.
The performance tables for R407C are also based
on DEW point values.
70
65
60
55
50
45
40
35
30
-25
-20
-15
-10
-5
0
5
10
15
20
Condensing t
emper
atur
e (°C
)
Evaporating temperature (°C)
Dew temperature conditions
S.H. = 30 K
SUPERHEAT
S.H. = 11.1 K
70
65
60
55
50
45
40
35
30
-25
-20
-15
-10
-5
0
5
10
15
20
C
ondensing t
emper
atur
e (°C
)
Evaporating temperature (°C)
Dew temperature conditions
S.H. = 11.1 K
S.H. = 30 K
SUPERHEAT
SZ084 to 185
R404A / R507A
75
30
70
65
60
55
50
45
40
35
-25
-20
-15
-10
0
5
10
15
-5
Condensing t
emper
atur
e (°C
)
S.H. = 11.1 K
S.H. = 30 K
SUPERHEAT
Evaporating temperature (°C)
28
FRCC.PC.003.B4.02
Application Guidelines