ERS EMCH-10W/1, Installation And User Manual

Page: 119 / 190

10. Operation Limits
10.1 Ethylene Glycol Solutions
Water and ethylene glycol solutions used as a thermal vector in the place of water reduce the performance
of the unit. Multiply the performance figures by the values given in the following table.
Freezing point (
°
C)
0 -5 -10 -15 -20 -25
Percentage of ethylene glycol in weight
0 12% 20% 28% 35% 40%
cPf 1 0.98 0.97 0.965 0.96 0.955
cQ 1 1.02 1.04 1.075 1.11 1.14
cdp
1 1.07 1.11 1.18 1.22 1.24
cPf : Correction factor of heating/cooling capacity cQ : Correction factor of flow rate cdp : Correction factor of pressure
drop
COOLING
DELIVERY WATER TEMPERATURE
E
R
U
T
A
RE
P
ME
T
RI
A
E
DI
S
T
U
O
C
-
-10 4 5 7 15 20
-5
20
35
46
C
HEATING
DELIVERY WATER TEMPERATURE
E
R
U
T
A
RE
P
ME
T
RI
A
E
DI
S
T
U
O
30 45 55
-15
-3
7
27
35
20
C
C
24
V.2