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 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)
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