54 - PVD3627-August 2011
Main formulas
p
C
n
dissipatio
Power
rate
Flow
*
60
*
_
_
°
∆
=
θ
With:
Flow rate
[l/min]
Power_dissipation
[kW]
∆θ
°
Gradient inlet-outlet [°C]
Cp
thermal specific capacity of the water as coolant [J/kg°K]
(
Cp
depends on the % glycol concentration please see below)
We have considered an average temperature of the coolant of 30°C.
Thermal specific capacity Cp according to % glycol concentration and
temperature
Glycol concentration
[%]
Average temperature of the water as
coolant [°C]
Thermal specific capacity of the water
Cp
[J/kg°K]
0
30
4176
30
30
3755
40
30
3551
50
30
3354
