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# Steam Radiators and Convectors - Heating Capacities

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

### Steam Heated Radiator

The heat capacity of a steam radiator can be expressed as

H r = q s h s λ r (1)

where

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

q s = condensate rate (kg/h, lb/h)

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

λ r = radiator temperature correction coefficient = 1 for room temperature 70 o F (21 o C) and steam temperature 215 o F (100 o C).

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

λ r = [( (215 o F) - (70 o F) )/(t s - t r )] 1.3 (1b)

where

t s = average steam temperature ( o F)

t r = room temperature ( o F)

### Steam Heated Convector

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

H c = q s h s λ c (2)

where

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

q s = condensate rate (kg/h, lb/h)

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

λ c = convector temperature correction coefficient = 1 for inlet temperature 65 o F (18 o C) and steam temperature 215 o F (100 o C).

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

λ = [((215 o F) - (65 o F) )/(t s - t i )] 1.5 (3)

where

t s = steam temperature ( o F)

t i = inlet temperature ( o F)

## Related Topics

• ### Heating

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

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Heat loss through common building elements due to transmission, R-values and U-values - imperial and SI units.

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## Citation

• The Engineering ToolBox (2005). Steam Radiators and Convectors - Heating Capacities. [online] Available at: https://www.engineeringtoolbox.com/steam-radiator-convector-d_957.html [Accessed Day Month Year].

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12.8.9