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# Steam Radiators and Convectors - Heating Capacities

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 oF (21 oC) and steam temperature 215 oF (100 oC).

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

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

where

t s = average steam temperature ( oF)

t r = room temperature ( oF)

### 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 oF (18 oC) and steam temperature 215 oF (100 oC).

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

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

where

t s = steam temperature ( oF)

t i = inlet temperature ( oF)

## Related Topics

### • Heating Systems

Design of heating systems - capacities and design of boilers, pipelines, heat exchangers, expansion systems and more.

### • Steam and Condensate

Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.

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### Cooling and Heating Equations

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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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An introduction to the basic design of steam heating systems.

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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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