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Engineering ToolBox > Heating Capacity of Steam Radiators and Convectors
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. λr = 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 = [(215 - 70)/(ts - tr)]1.3 (1b)
where
ts = steam temperature (oF)
tr = room temperature (oF)
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. λc = 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 = [(215 - 65)/(ts - ti)]1.5 (2)
where
ts = steam temperature (oF)
ti = inlet temperature (oF)