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)
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