Two-pipe heating system

Example of calculation:

Solution to: 

  • level of valve setting

Given:

  • heat output: Q = 1135 W
  • cooling of water: t1 - t2 = 15 K (65/50 °C)
  • pressure loss of radiator with valve: Δp = 30 mbar
  • heat capacity of water: c = 1,163 Wh/kg.K

Solution: 

  • mass flow:
m =Q

c . (t1 - t2)
=1135

1,163 . 15
= 65 kg/h

Level of valve setting  (see diagram): 4

 

Radiators in version VENTIL KOMPAKT without connecting fittingsLevel of valve settingHighest allowed working temperature [°C]Highest allowed working pressure [bar]
12345678
Valve with eight levels of setting and with a thermostatic headkV
[m3/h]
0,130,220,310,380,470,570,660,7511010
kVS
[m3/h]
0,160,270,380,430,650,981,231,43
The indicated values of k comply with proportionality interval of 2 K.

Conversion table for valve setting

Setting of 8-level valve following a calculation made for a 6-level valve.

Level of valve setting
6-level valve123456
8-level valve112,54,56,58
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