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.Deaerator provides feedwater near the boiling temperature for the deaerator's set operating pressure.
Boiler Energy = Steam Energy Flow + Blowdown Energy Flow - Feedwater Energy Flow.Blowdown Energy Flow = Specific Enthalpy * Mass Flow.The Specific Enthalpy is then multiplied by the Mass Flow to get the Energy Flow: Using the Steam Property Calculator, properties are determined using Steam Pressure and Quality = 0 (Saturated Liquid). Step 3: Determine Blowdown Properties and Mass Flow Using the calculated feedwater mass flow and blowdown rate: Feedwater Energy Flow = Specific Enthalpy * Mass Flow.Using the Steam Property Calculator, properties are determined using Deaerator Pressure and Quality = 0 (Saturated Liquid). Feedwater Mass Flow = Steam Mass Flow /.Steam Mass Flow = Feedwater Mass Flow - Feedwater Mass Flow * Blowdown Rate.Steam Mass Flow = Feedwater Mass Flow - Blowdown Mass Flow.Blowdown Mass Flow = Feedwater Mass Flow * Blowdown Rate.Step 2: Determine Feedwater Properties and Mass Flow The feedwater flow rate can be calculated from steam mass flow and blowdown rate: Steam Energy Flow = Specific Enthalpy * Mass Flow.Boiler and fuel types are not considered.Calculation Details Step 1: Determine Properties of Steam Produced Using the Steam Property Calculator, properties are determined using Steam 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.Calculation Details Step 1: Determine Properties of Steam Produced Using the Steam Property Calculator, properties are determined using Steam Pressure and the selected second parameter (Temperature, Specific Enthalpy, Specific Entropy, or Quality).
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