.. index:: pair: watertap.core.zero_order_siso;build_siso
.. currentmodule:: watertap.core.zero_order_siso
The build_siso method is intended to be used to rapidly construct a standard set of material balance equations for zero-order type models with a single inlet and single outlet.
from idaes.core import declare_process_block_class
from watertap.core import build_siso, ZeroOrderBaseData
@declare_process_block_class("UVZO")
class UVZOData(ZeroOrderBaseData):
CONFIG = ZeroOrderBaseData.CONFIG()
def build(self):
super().build()
self._tech_type = "uv"
build_siso(self)The build_siso method constructs a simple representation of unit operation with one inlet (named inlet) and one outlet (named treated). A StateBlock is constructed for each inlet and outlet with an associated Port.
The build_siso method creates the following variables in addition to those created by the StateBlocks.
| Variable | Name | Indices | Notes |
|---|---|---|---|
| r_{t} | recovery_frac_mass_H2O | time | Fraction of mass flow of water in inlet that goes to treated stream. |
| f_{t,j} | removal_frac_mass_comp | time, component | Fraction of mass flow of each component that is removed from the inlet stream. |
recovery_frac_mass_H2O is intended to be fixed to 1 (e.g., UV reactor which yields product stream without water losses), but the user can optionally set this to some fraction.
The build_siso method writes the following constraints which relate the inlet state to the treated stream. First, a water recovery equation is written for water to relate the flowrate at the treated outlet to that at the inlet:
water_recovery_equation(t):
r_t \times M_{inlet,t,H2O} = M_{treated,t,H2O}
where M_{t,H2O} is mass flowrate of water at time t.
Note, a mass balance for water is ignored since build_siso is intended to only account for constituent removal/conversion at the treated outlet. Thus, a mass balance constraint is only written for each solute.
solute_treated_equation(t, j):
(1 - f_{t, j}) \times M_{inlet,t,j} = M_{treated,t,j}