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Heat output from a radiator is determined by the

• ambient surrounding temperature
• temperature of the radiator surface
• surface area of the radiator

The formulas below can be used to estimate the 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

The heat emission from a column radiator can roughly be estimated as

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

The heat emission from a panel radiator can roughly be estimated as

P = 41 kp l (1 + 8 h)                                    (2)

where

P = heat emission (W)

kp = constant for panel radiator

Typical panel radiator configuration constants - kp:

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

## Related Topics

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## Related Documents

### Heat Emission from Radiators and Heating Panels

The heat emission from a radiator or a heating panel depends on the temperature difference between the radiator and the surrounding air.

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### Hot Water Heating System - Design Procedure

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### Steam Radiators and Convectors - Heating Capacities

Steam radiators and steam convectors - heating capacities and temperature coefficients.

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