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Influenceof coolantson flow values
The flow througha valve is defined by the k
v
-value. The k
v
-value is the flowm through a valve in [m³/h] at adifferential pressure
of 1 bar (14,5P.S.I.) and is only valid for fluidswith a density of σ
0
= 1000 kg/m³. This condition ismet bywater at a temperature
of 20°C (68°F). For fluidswith another density the following formula canbeapplied:
0
ρ
ρ
Medium
Medium
p
m
Kv
×
∆
=
Correction factor f
When the densityσ is expressed in t/m³ instead of kg/m³ the correction factor f is the result. The correction factor f canbe used
to re-calculate kv-value, pressuredropand flow:
f
Kv
Kv
Medium
1
0
× =
f
p
p
Medium
×∆=
∆
0
f
m m
Medium
1
0
× =
Table1. Values for correction factor f
Correction factor f
Medium
water part
5°C (41°F) 20°C (68°F) 35°C (95°F) 50°C (122°F) 65°C (149°F) 80°C (176°F)
Normal water
100% 1,000
0,998
0,994
0,988
0,981
0,972
Ethylen glycol
70% 1,052
1,047
1,041
1,033
10,24
1,015
e.g. AntifrogenN 50% 1,086
1,079
1,070
1,061
1,052
1,042
Propylen glycol
70% 1,035
1,029
1,021
1,012
1,002
0,991
e.g. AntifrogenL
50% 1,053
1,044
1,035
1,025
1,014
1,002
