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 50^oC (inlet water temperature 80^oC, outlet water temperature 60^oC and ambient air 20^oC).   

Heat Emission from Column Radiators

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

P = k_c V_e         (1)

where

P = heat emission (W)

k_c = 15000 - 17000 - constant for column radiator

V_e = external radiator volume (m³)

Heat Emission from Panel Radiators

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

P = 41 k_p l (1 + 8 h)         (2)

where

P = heat emission (W)

k_p = 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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