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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

Hr = qs hs λ                           (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)

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

λr = (((215 oF) - (70 oF)) / (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 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)) / (ts - ti ))1.5                         (3)

where

ts = steam temperature (oF)

ti = inlet temperature (oF)

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