Condensation of Steam - Heat Transfer
The heat released when condensing steam can be expressed as
Q = he Ms (1)
where
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)
where
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)
Related Topics
• Thermodynamics
Thermodynamics of steam and condensate systems.
Related Documents
Arithmetic and Logarithmic Mean Temperature Difference
Arithmetic Mean Temperature Difference in Heat Exchangers - AMTD - and Logarithmic Mean Temperature Difference - LMTD - formulas with examples - Online Mean Temperature Calculator.
Carnot Efficiency
The efficiency of the Carnot cycle.
Convective Heat Transfer
Heat transfer between a solid and a moving fluid is called convection. This is a short tutorial about convective heat transfer.
Energy Transfer Equation
Fluid energy transfer.
Heat Transfer Coefficients in Heat Exchanger Surface Combinations
Average overall heat transmission coefficients for fluid and surface combinations like Water to Air, Water to Water, Air to Air, Steam to Water and more.
Heat, Work and Energy
Heat vs. work vs. energy.
Heating Systems - Steam and Condensate Loads
Calculating steam and condensate loads in steam heated systems.
Heating Water by Injecting Steam
Water can be heated by injecting steam.
Overall Heat Transfer Coefficients
Walls or heat exchangers - calculate overall heat transfer coefficients.
Pipes Submerged in Water - Heat Emission
Heat emision from steam or water heating pipes submerged in water - assisted (forced) or natural circulation.
Properties of Saturated Steam - SI Units
Saturated Steam Table with steam properties as specific volume, density, specific enthalpy and specific entropy.
Saturated Steam - Properties - Imperial Units
Steam table with sensible, latent and total heat, and specific volume at different gauge pressures and temperatures.
Steam & Condensate Equations
Steam consumption and condensate generation when heating liquid or gas flows
Steam - Flow vs. kW Rating
Calculate steam flow rate vs. kW rating.
Steam and Vapor Enthalpy
Vapor and steam enthalpy, specific enthalpy of saturated liquid, saturated vapor and superheated vapor.
Steam Heating Air
Calculate steam heated air systems.
Steam Heating Processes - Load Calculating
Calculating the amount of steam in non-flow batch and continuous flow heating processes.
Submerged Coils - Heat Transfer Coefficients
Heat transfer coefficients for steam and hot water coils submerged in oil tanks.
Superheated Steam - Enthalpy
Enthalpy of steam superheated to temperatures above it's boiling point.
Wet Steam - Enthalpy
Wet steam, dryness fraction and enthalpy.