# Heat Transfer with Condensation of Steam

## Heat transferred when condensation of steam

The heat released when condensing steam can be expressed as

Q = he M                        (1)

where

Q = quantity of heat released (kJ)

Ms = mass of condensing steam (kg)

he = specific evaporation enthalpy of steam (kJ/kg)

The heat transfer rate - power - in a condensing steam flow can be expressed as

q = he ms                        (2)

where

q = heat transfer (kW)

ms = steam flow rate (kg/s)

### Example - Heat released when Condensing Steam

5 kg of steam with atmospheric pressure, temperature 100 oC and evaporation enthalpy 2257 kJ/kg is condensated. The heat transferred can be calculated as

Q = (2257 kJ/kg) (5 kg)

= 11285 kJ

### Example - Heat Transfer Rate - Power in Condensing Steam Flow

The heat transfer rate in a condensing steam flow rate 8 kg/h (0.0022 kg/s) with atmospheric steam with temperature 100 oC - can be calculated as

q = (2257 kJ/kg) (0.0022 kg/s)

= 5 kJ/s (kW)

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