Deaerator Calculator watch tutorial view guide

Determines the required water and steam flows for a required feedwater mass flow.


Deaerator Pressure * psig
Vent Rate * %
Feedwater Mass Flow * klb/hr

Water

Pressure* psig
* °C btu/lbm kJ/kg/K

Steam

Pressure* psig
* °C btu/lbm kJ/kg/K
* Required
Allowed Range / Limits
Minimum
Maximum
Examples: Mouse Over
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Calculation Details and Assumptions below



Calculation Details

Step 1: Determine Inlet Water Properties

Using the Steam Property Calculator, properties are determined using Inlet Water Pressure and the selected second parameter (Temperature, Specific Enthalpy, Specific Entropy, or Quality):

Step 2: Determine Inlet Steam Properties

Using the Steam Property Calculator, properties are determined using Inlet Steam Pressure and the selected second parameter (Temperature, Specific Enthalpy, Specific Entropy, or Quality):

Step 3: Determine Feedwater and Vented Steam Properties


Step 4: Determine Feedwater and Vented Mass Flows and Total Outlet Energy Flows

  • Vented Steam Mass Flow = Vent Rate * Feedwater Mass Flow
  • Total DA Mass Flow = Vented Steam Mass Flow + Feedwater Mass Flow
  • Total Outlet Energy Flow = [Feedwater Specific Enthalpy * Feedwater Mass Flow] + [Vented Steam Specific Enthalpy * Vented Steam Mass Flow]

Step 5: Determine Inlet Water and Steam Mass Flows

The inlet mass flows are determine based on an energy and mass flow balance:
  • Minimum Inlet Energy Flow = Inlet Water Specific Enthalpy * Total DA Mass Flow
  • Additional Energy Flow Needed = Total Outlet Energy Flow - Minimum Inlet Energy Flow
  • Inlet Steam Mass Flow = Additional Energy Flow Needed / ( Inlet Steam Specific Enthalpy - Inlet Water Specific Enthalpy )
  • Inlet Water Mass Flow = Total DA Mass Flow - Inlet Water Mass Flow

Assumptions

  • The Deaerator (DA) Vent Rate is a percent of feedwater flow.
  • The feedwater leaves the DA as a saturated liquid at DA pressure.
  • The DA vented gases are assumed to be saturated gas at DA pressure.
  • The DA has no additional heat or masses losses.