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Steam Condensation and Heat Transfer

Heat transfer when condensing steam

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The heat released when condensing steam can be expressed as

Q = he M                        (1)


Q = quantity of heat released (kJ, Btu)

Ms = mass of condensing steam (kg, lb)

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

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

q = he ms                        (2)


q = heat transfer (kW, Btu/h)

ms = steam flow rate (kg/s, lb/h)

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 transfer can be calculated as

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

   = 11285 kJ

Example - Heat Transfer Rate - or Power - in a Condensing Steam Flow

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

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

  = 5 kJ/s (kW)

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