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## Calculate heat emission from column and panel radiators.

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

- kp - panel radiator constant

- l - radiator length (m)

- h - radiator height (m)

## Related Topics

• Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more.

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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

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