Heat Emission from Radiators

Calculating heat emission from new and existing column and panel radiators

The heat output from a radiator is determined by the ambient temperature, the temperature of the radiator surface and the surface area of the radiator.

The formulas below can be used to estimate heat emission from radiators where the temperature difference between the radiator surface and the ambient air is 50oC (inlet water temperature 80oC, outlet water temperature 60oC and ambient air 20oC).   

Heat Emission from Column Radiators

column radiator heat emission

he heat emission from column radiators can be roughly estimated with the equation

P = kc Ve         (1)

where

P = heat emission (W)

kc = 15000 - 17000 - constant for column radiator

Ve = external radiator volume (m3)

Heat Emission from Panel Radiators

panel radiator heat emission

The heat emission from panel radiators can be roughly estimated with the equation

P = 41 kp l (1 + 8 h)         (2)

where

P = heat emission (W)

kp = constant for panel radiator

l = radiator length (m)

h = radiator height (m)

The panel radiator constants for different panel radiator configurations can be set to

  • 3.1 : single panel
  • 4.1 : panel - convector
  • 4.9 : two panels
  • 5.8 : panel - convector - panel
  • 7 : panel - convector - convector - panel
  • 7.6 : three panels
  • 8.8 : panel - convector - panel - convector - panel  
  • 9 : four panels

 

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