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# Steam Radiators and Convectors - Heating Capacities

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

The heat capacity of a steam radiator can be expressed as

Hr = qs hs λr                           (1)

where

Hr = heat capacity of radiator (kW, Btu/h)

qs = condensate rate (kg/h, lb/h)

hs = latent heat steam (2675 kJ/kg, 970 Btu/lb)

λr = radiator temperature correction coefficient = 1 for room temperature 70oF (21oC) and steam temperature 215oF (100oC).

The radiator correction coefficient for other room and steam temperatures can be calculated

λr = [((215oF) - (70oF))/(ts - tr)]1.3                           (1b)

where

ts = average steam temperature (oF)

tr = room temperature (oF)

### Steam Heated Convector

The heat capacity of a steam heated convector can be expressed as

Hc = qs hs λc                        (2)

where

Hc = heat capacity of convector (kW, Btu/h)

qs = condensate rate (kg/h, lb/h)

hs = latent heat steam (2675 kJ/kg, 970 Btu/lb)

λc = convector temperature correction coefficient = 1 for inlet temperature 65oF (18oC) and steam temperature 215oF (100oC).

The convector correction coefficient for other room and steam temperatures can be calculated

λ = [((215oF) - (65oF))/(ts - ti)]1.5                         (3)

where

ts = steam temperature (oF)

ti = inlet temperature (oF)

## Related Topics

• Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.
• 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
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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
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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

3 30