pair: idaes.power_generation.unit_models.feedwater_heater_0D; FWHCondensing0D
idaes.power_generation.unit_models.feedwater_heater_0D
The condensing feedwater heater is the same as the HeatExchanger <reference_guides/model_libraries/generic/unit_models/heat_exchanger:HeatExchanger (0D)> model with one additional constraint to calculate the inlet flow rate such that all the entering steam is condensed. This model is suitable for steady state modeling, and is intended to be used with the IAWPS95 <reference_guides/model_libraries/generic/property_models/iapws95:International Association of the Properties of Water and Steam IAPWS-95> property package. For dynamic modeling, the 1D feedwater heater models should be used (not yet publicly available).
Usually area and overall_heat_transfer_coefficient are fixed or constraints are provided to calculate overall_heat_transfer_coefficient. If the inlets are also fixed except for the inlet steam flow rate (inlet_1.flow_mol), the model will have 0 degrees of freedom.
The variables are the same as HeatExchanger <reference_guides/model_libraries/generic/unit_models/heat_exchanger:HeatExchanger (0D)>.
In addition to the HeatExchanger <reference_guides/model_libraries/generic/unit_models/heat_exchanger:HeatExchanger (0D)> constraints, there is one additional constraint to calculate the inlet steam flow such that all steam condenses. The constraint is called extraction_rate_constraint, and is defined below.
hsteam, out = hsat, liquid(P)
Where h is molar enthalpy, and the saturated liquid enthalpy is a function of pressure.
FWHCondensing0D
FWHCondensing0DData