Steam Radiators and Convectors - Heating Capacities
Steam Heated Radiator
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)
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)
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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