# Heating Capacity - Steam Radiators and Convectors

## Steam radiators and steam convectors - heating capacities and temperature coefficients

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### 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)/(t^{o}F) - (70^{o}F)_{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)/(t^{o}F)_{s}- t_{i})]^{1.5}(2)

where

t_{s}= steam temperature (^{o}F)

t_{i}= inlet temperature (^{o}F)

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