Operating conditions
SY240 to 380
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 gure below, the dashed lines
reect 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 temperature (°C)
Evaporating temperature (°C)
Dew temperature conditions
S.H. = 30 K
SUPERHEAT
S.H. = 11.1 K
Dew temperature and mean
temperature for R407C
pressure (log)
enthalpy
Dew
Dew
Mean
Mean
29AB237986441643en-010801
Application Guidelines
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