Inlet Mass Flows equal Outlet Mass Flow.Power Out = Energy Out * Generator Efficiency.Energy Out = ( Inlet Specific Enthalpy - Outlet Specific Enthalpy) * Mass Flow.Step 4: Calculate Steam Turbine Energy Out and Generation (Power Out) Using the outlet specific enthalpy, calculate the outlet properties: Outlet Specific Enthalpy = Inlet Specific Enthalpy - Isentropic Efficiency * ( Inlet Specific Enthalpy - IDEAL Outlet Specific Enthalpy).( Inlet Specific Enthalpy - Outlet Specific Enthalpy) Isentropic Efficiency * ( Inlet Specific Enthalpy - IDEAL Outlet Specific Enthalpy) =.Step 3: If solve for 'Outlet Properties', Determine Outlet Specific Enthalpy ( Inlet Specific Enthalpy - IDEAL Outlet Specific Enthalpy) Isentropic Efficiency = ( Inlet Specific Enthalpy - Outlet Specific Enthalpy) /.Step 3: If solve for 'Isentropic Efficiency', Determine Outlet Properties Using the outlet specific enthalpy, calculate the isentropic efficiency: Step 2: Calculate Ideal Outlet Properties (Inlet Entropy equals Outlet Entropy) Inlet Energy Flow = Specific Enthalpy * Mass Flow.We have the relation, Heat lost by the super-heated steam Heat gained by the feed water. For calculation of attemperator water Mw. Feed water enthalpy at temperature 105 deg C, Hf 106 kcal/kg. The Specific Enthalpy is then multiplied by the Mass Flow to get the Energy Flow: Enthalpy of steam after attemperation at pressure 87 kg/cm2 & temperature 425 deg C, H2 771 kcal/kg. Boiler and fuel types are not considered.Calculation Details and Assumptions belowĬalculation 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).Energy from motors (pumps, fans, etc.) are not considered.Does not include any evaluation of any complex boiler configurations or fluctuations in operation.Blowdown Rate is the % of incoming feedwater mass flow rate that leaves the boiler as a saturated liquid at boiler pressure.Combustion Efficiency is the % of fuel energy that is directly added to the feedwater and not otherwise lost or used.Steam, Boiler, and Blowdown Pressure are the same.
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