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The Desuperheater model simulates a desuperheater by adding water to steam to cool the steam to a specified state.
The Desuperheater model can also be used as a steam mixer by adding steam to a water or steam stream to heat the stream to a specified state. Thus, the normal Steam Inlet and Outlet can be a water inlet and outlet and the normal Water Inlet can be a steam inlet.
The outlet stream state is set by giving the Discharge Temperature and the Discharge Pressure or the Degrees of Superheat. If the Degrees of Superheat is given, the Discharge Pressure is the saturation pressure. If neither the Discharge Pressure nor the Degrees of Superheat are given, the Discharge Pressure is the inlet pressure.
If the Discharge Temperature is not given, the Discharge Temperature is the Discharge Pressure's saturation temperature plus the Degrees of Superheat.
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Data Description
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Data |
Unit |
Description |
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Set |
Item |
Type |
Native |
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Equipment Properties |
InletGiven |
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If checked (True) the outlet flow is set equal to the inlet flow plus the desuperheating
flow. If not checked (False) the inlet flow is set equal to the outlet flow minus
the desuperheating flow. |
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Discharge Temperature |
Temperature |
F |
Outlet temperature. |
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Discharge Pressure |
Pressure |
psia |
Outlet Pressure. |
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Degrees of Superheat |
Temperature Change |
Delta F |
Degrees of superheat. |
If the outlet flow is given the Water Inlet flow is calculated from:
Fwater = Foutlet * ( houtlet - hinlet ) / ( hwater - hinlet )
If inlet flow is given the Water Inlet flow is calculated from:
Fwater = Finlet * ( houtlet - hinlet ) / ( hwater - houtlet )
where:
Fwater is the Water Inlet flow
Finlet is the Steam Inlet flow
Foutlet is the Steam Outlet flow
hwater is the Water Inlet enthalpy
hinlet is the Steam Inlet enthalpy
houtlet is the Steam Outlet enthalpy
No desuperheating water entering, default is used!
Solution: Set the water inlet properties.
No desuperheating water needed!
Solution: Outlet conditions cannot be met.
Solution: check if all the streams are connected to the equipment.
Warnings 
Errors