Steam Turbine Calculator

Calculates the energy generated or steam outlet conditions for a steam turbine.


Solve for:

Inlet Steam

Pressure* psig
* °C btu/lbm kJ/kg/K

Turbine Properties

Selected Turbine Property
Mass Flow * klb/hr
Isentropic Efficiency * %
Generator Efficiency * %
Power Out * kW

Outlet Steam

Pressure* psig
* °C btu/lbm kJ/kg/K
* Required
Allowed Range / Limits
Minimum
Maximum
Examples: Mouse Over
Solve for Outlet Properties Solve for Isentropic Efficiency



Calculation Details and Assumptions below



Calculation Details

Step 1: Determine Inlet Properties

Using the Steam Property Calculator, properties are determined using Inlet Pressure and the selected second parameter (Temperature, Specific Enthalpy, Specific Entropy, or Quality). The Specific Enthalpy is then multiplied by the Mass Flow to get the Energy Flow:
  • Inlet Energy Flow = Specific Enthalpy * Mass Flow

Step 2: Calculate Ideal Outlet Properties (Inlet Entropy equals Outlet Entropy)


Step 3: If solve for 'Isentropic Efficiency', Determine Outlet Properties

Using the outlet specific enthalpy, calculate the isentropic efficiency:
  • Isentropic Efficiency = (Inlet Specific Enthalpy - Outlet Specific Enthalpy) / (Inlet Specific Enthalpy - IDEAL Outlet Specific Enthalpy)

Step 3: If solve for 'Outlet Properties', Determine Outlet Specific Enthalpy

  1. Isentropic Efficiency = (Inlet Specific Enthalpy - Outlet Specific Enthalpy) / (Inlet Specific Enthalpy - IDEAL Outlet Specific Enthalpy)
  2. Isentropic Efficiency * (Inlet Specific Enthalpy - IDEAL Outlet Specific Enthalpy) = (Inlet Specific Enthalpy - Outlet Specific Enthalpy)
  3. Outlet Specific Enthalpy = Inlet Specific Enthalpy - Isentropic Efficiency * (Inlet Specific Enthalpy - IDEAL Outlet Specific Enthalpy)
Using the outlet specific enthalpy, calculate the outlet properties:

Step 4: Calculate Steam Turbine Energy Out and Generation (Power Out)

  • Energy Out = (Inlet Specific Enthalpy - Outlet Specific Enthalpy) * Mass Flow
  • Power Out = Energy Out * Generator Efficiency

Assumptions

  • Inlet Mass Flows equal Outlet Mass Flow.