def solve_flowsheet(**desal_kwargs):
m = ConcreteModel()
m.fs = FlowsheetBlock(default={"dynamic": False})
build(m, **desal_kwargs)
TransformationFactory("network.expand_arcs").apply_to(m)
# scale
calculate_scaling_factors(m.fs.tb_pretrt_to_desal)
scale(m, **desal_kwargs)
calculate_scaling_factors(m)
# initialize
m.fs.feed.initialize()
propagate_state(m.fs.s_pretrt_tb)
optarg = {'nlp_scaling_method': 'user-scaling'}
m.fs.tb_pretrt_to_desal.initialize(optarg=optarg)
initialize(m, **desal_kwargs)
check_dof(m)
solve_block(m, tee=False, fail_flag=True)
# report
report(m, **desal_kwargs)
return m
def initialize_system(m):
prtrt = m.fs.pretreatment
desal = m.fs.desalination
psttrt = m.fs.posttreatment
# initialize feed
solve(m.fs.feed)
# initialize pretreatment
propagate_state(m.fs.s_feed)
flags = fix_state_vars(prtrt.intake.properties)
solve(prtrt)
revert_state_vars(prtrt.intake.properties, flags)
# initialize desalination
propagate_state(m.fs.s_prtrt_tb)
m.fs.tb_prtrt_desal.properties_out[0].flow_mass_phase_comp["Liq", "H2O"] = value(
m.fs.tb_prtrt_desal.properties_in[0].flow_mass_comp["H2O"]
)
m.fs.tb_prtrt_desal.properties_out[0].flow_mass_phase_comp["Liq", "TDS"] = value(
m.fs.tb_prtrt_desal.properties_in[0].flow_mass_comp["tds"]
)
desal.RO.feed_side.properties_in[0].flow_mass_phase_comp["Liq", "H2O"] = value(
m.fs.feed.properties[0].flow_mass_comp["H2O"]
)
desal.RO.feed_side.properties_in[0].flow_mass_phase_comp["Liq", "TDS"] = value(
m.fs.feed.properties[0].flow_mass_comp["tds"]
)
desal.RO.feed_side.properties_in[0].temperature = value(
m.fs.tb_prtrt_desal.properties_out[0].temperature
)
desal.RO.feed_side.properties_in[0].pressure = value(
desal.P1.control_volume.properties_out[0].pressure
)
desal.RO.initialize()
propagate_state(m.fs.s_tb_desal)
if m.erd_type == "pressure_exchanger":
flags = fix_state_vars(desal.S1.mixed_state)
solve(desal)
revert_state_vars(desal.S1.mixed_state, flags)
elif m.erd_type == "pump_as_turbine":
flags = fix_state_vars(desal.P1.control_volume.properties_in)
solve(desal)
revert_state_vars(desal.P1.control_volume.properties_in, flags)
# initialize posttreatment
propagate_state(m.fs.s_desal_tb)
m.fs.tb_desal_psttrt.properties_out[0].flow_mass_comp["H2O"] = value(
m.fs.tb_desal_psttrt.properties_in[0].flow_mass_phase_comp["Liq", "H2O"]
)
m.fs.tb_desal_psttrt.properties_out[0].flow_mass_comp["tds"] = value(
m.fs.tb_desal_psttrt.properties_in[0].flow_mass_phase_comp["Liq", "TDS"]
)
propagate_state(m.fs.s_tb_psttrt)
flags = fix_state_vars(psttrt.storage_tank_2.properties)
solve(psttrt)
revert_state_vars(psttrt.storage_tank_2.properties, flags)
def initialize_flowsheet(m):
m.fs.M01.initialize(outlvl=idaeslog.WARNING)
propagate_state(m.fs.s01)
m.fs.H02.initialize(outlvl=idaeslog.WARNING)
propagate_state(m.fs.s02)
m.fs.F03.initialize(outlvl=idaeslog.WARNING)
def initialize(m, has_bypass=True):
optarg = {'nlp_scaling_method': 'user-scaling'}
pretreatment_NF.initialize_pretreatment_NF(m,
NF_type='ZO',
NF_base='ion',
has_bypass=has_bypass)
m.fs.pretrt_saturation.properties.initialize(optarg=optarg)
propagate_state(m.fs.s_pretrt_tb)
m.fs.tb_pretrt_to_desal.initialize(optarg=optarg)
def initialize(m, has_bypass=True):
optarg = {"nlp_scaling_method": "user-scaling"}
pretreatment_NF.initialize_pretreatment_NF(m,
NF_type="ZO",
NF_base="ion",
has_bypass=has_bypass)
m.fs.pretrt_saturation.properties.initialize(optarg=optarg)
propagate_state(m.fs.s_pretrt_tb)
m.fs.tb_pretrt_to_desal.initialize(optarg=optarg)
def copy_port_values(destination=None, source=None, arc=None,
direction="forward"):
"""
Moved to idaes.core.util.initialization.propagate_state.
Leaving redirection function here for deprecation warning.
"""
_log.warning("DEPRECATED: copy_port_values has been deprecated. "
"The same functionality can be found in "
"idaes.core.util.initialization.propagate_state.")
from idaes.core.util.initialization import propagate_state
propagate_state(destination=destination, source=source, arc=arc,
direction=direction)
def test_propagate_state_indexed_fixed():
m = ConcreteModel()
def block_rule(b):
b.s = Set(initialize=[1, 2])
b.v1 = Var()
b.v2 = Var(b.s)
b.p = Port(b.s)
b.p[1].add(b.v1, "V1")
b.p[2].add(b.v2, "V2")
return
m.b1 = Block(rule=block_rule)
m.b2 = Block(rule=block_rule)
def arc_rule(m, i):
return {'source': m.b1.p[i], 'destination': m.b2.p[i]}
m.s1 = Arc([1, 2], rule=arc_rule)
# Set values on first block
m.b1.v1.value = 10
m.b1.v2[1].value = 20
m.b1.v2[2].value = 30
# Make sure vars in block 2 haven't been changed accidentally
assert m.b2.v1.value is None
assert m.b2.v2[1].value is None
assert m.b2.v2[2].value is None
# Fix v1 in block 2
m.b2.v1.fix(500)
propagate_state(m.s1[1])
# Check that values were propagated correctly
assert m.b2.v1.value == 500
assert m.b1.v1.fixed is False
assert m.b2.v1.fixed is True
propagate_state(m.s1[2])
# Check that values were propagated correctly
assert m.b2.v2[1].value == m.b1.v2[1].value
assert m.b2.v2[2].value == m.b1.v2[2].value
assert m.b1.v2[1].fixed is False
assert m.b1.v2[2].fixed is False
assert m.b2.v2[1].fixed is False
assert m.b2.v2[2].fixed is False
def do_backwards_initialization_pass(m, optarg):
first_stage = m.fs.StageSet.first()
for stage in reversed(m.fs.NonFinal_StageSet):
m.fs.Mixers[stage].initialize(optarg=optarg)
propagate_state(m.fs.mixer_to_stage[stage])
m.fs.ROUnits[stage].initialize(optarg=optarg)
propagate_state(m.fs.stage_to_pump[stage])
if stage == first_stage:
propagate_state(m.fs.primary_RO_to_product)
else:
propagate_state(m.fs.stage_to_eq_pump[stage])
m.fs.BoosterPumps[stage].initialize(optarg=optarg)
propagate_state(m.fs.eq_pump_to_mixer[stage])
def initialize(self, state_args=None,
solver=None, optarg=None, outlvl=idaeslog.NOTSET):
init_log = idaeslog.getInitLogger(self.name, outlvl, tag="unit")
solver = get_solver(solver=solver, options=optarg)
self.compressor.initialize(state_args=state_args, outlvl=outlvl)
propagate_state(self.comp_to_reactor)
self.stoic_reactor.initialize(outlvl=outlvl)
propagate_state(self.reactor_to_turbine)
self.turbine.initialize(outlvl=outlvl)
def solve_flowsheet_mvp_NF(**kwargs):
m = ConcreteModel()
m.fs = FlowsheetBlock(default={"dynamic": False})
build_flowsheet_mvp_NF(m, **kwargs)
TransformationFactory("network.expand_arcs").apply_to(m)
# scale
pretreatment_NF.scale_pretreatment_NF(m, **kwargs)
calculate_scaling_factors(m.fs.tb_pretrt_to_desal)
desalination.scale_desalination(m, **kwargs)
calculate_scaling_factors(m)
# initialize
optarg = {"nlp_scaling_method": "user-scaling"}
pretreatment_NF.initialize_pretreatment_NF(m, **kwargs)
m.fs.pretrt_saturation.properties.initialize(optarg=optarg)
propagate_state(m.fs.s_pretrt_tb)
m.fs.tb_pretrt_to_desal.initialize(optarg=optarg)
propagate_state(m.fs.s_tb_desal)
desalination.initialize_desalination(m, **kwargs)
m.fs.desal_saturation.properties.initialize()
m.fs.costing.initialize()
# check_build(m)
# check_scaling(m)
check_dof(m)
solve_block(m, tee=False, fail_flag=True)
pretreatment_NF.display_pretreatment_NF(m, **kwargs)
m.fs.tb_pretrt_to_desal.report()
desalination.display_desalination(m, **kwargs)
print(
"desalination solubility index:", value(m.fs.desal_saturation.saturation_index)
)
print(
"pretreatment solubility index:", value(m.fs.pretrt_saturation.saturation_index)
)
print("water recovery:", value(m.fs.system_recovery))
print("LCOW:", value(m.fs.costing.LCOW))
print("CP modulus:", value(m.fs.desal_saturation.cp_modulus))
return m
def initialize(m):
m.fs.evaporator.inlet_condenser.flow_mass_phase_comp[0, "Vap",
"H2O"].fix(0.5)
m.fs.evaporator.inlet_condenser.flow_mass_phase_comp[0, "Liq",
"H2O"].fix(1e-8)
m.fs.evaporator.inlet_condenser.temperature[0].fix(400) # K
m.fs.evaporator.inlet_condenser.pressure[0].fix(0.5e5) # Pa
m.fs.evaporator.initialize(outlvl=idaeslog.INFO_HIGH)
m.fs.evaporator.inlet_condenser.flow_mass_phase_comp[0, "Vap",
"H2O"].unfix()
m.fs.evaporator.inlet_condenser.flow_mass_phase_comp[0, "Liq",
"H2O"].unfix()
m.fs.evaporator.inlet_condenser.temperature[0].unfix() # K
m.fs.evaporator.inlet_condenser.pressure[0].unfix() # Pa
propagate_state(m.fs.s01)
m.fs.compressor.initialize(outlvl=idaeslog.INFO_HIGH)
def test_propagate_state_invalid_direction():
m = ConcreteModel()
def block_rule(b):
b.s = Set(initialize=[1, 2])
b.v1 = Var()
b.v2 = Var(b.s)
b.p = Port()
b.p.add(b.v1, "V1")
b.p.add(b.v2, "V2")
return
m.b1 = Block(rule=block_rule)
m.b2 = Block(rule=block_rule)
m.s1 = Arc(source=m.b1.p, destination=m.b2.p)
with pytest.raises(ValueError):
propagate_state(m.s1, direction="foo")
def test_propagate_state_reverse():
m = ConcreteModel()
def block_rule(b):
b.s = Set(initialize=[1, 2])
b.v1 = Var()
b.v2 = Var(b.s)
b.p = Port()
b.p.add(b.v1, "V1")
b.p.add(b.v2, "V2")
return
m.b1 = Block(rule=block_rule)
m.b2 = Block(rule=block_rule)
m.s1 = Arc(source=m.b1.p, destination=m.b2.p)
# Test reverse propogation - set values on second block
m.b2.v1.value = 100
m.b2.v2[1].value = 200
m.b2.v2[2].value = 300
# Make sure vars in block 1 haven't been changed accidentally
assert m.b1.v1.value is None
assert m.b1.v2[1].value is None
assert m.b1.v2[2].value is None
propagate_state(m.s1, direction="backward")
# Check that values were propagated correctly
assert m.b2.v1.value == m.b1.v1.value
assert m.b2.v2[1].value == m.b1.v2[1].value
assert m.b2.v2[2].value == m.b1.v2[2].value
assert m.b1.v1.fixed is False
assert m.b1.v2[1].fixed is False
assert m.b1.v2[2].fixed is False
assert m.b2.v1.fixed is False
assert m.b2.v2[1].fixed is False
assert m.b2.v2[2].fixed is False
def initialize(self,
state_args=None,
solver=None,
optarg=None,
outlvl=idaeslog.NOTSET):
init_log = idaeslog.getInitLogger(self.name, outlvl, tag="unit")
solver = get_solver(solver=solver, options=optarg)
self.compressor.initialize(state_args=state_args, outlvl=outlvl)
propagate_state(self.comp_to_reactor)
self.stoic_reactor.initialize(outlvl=outlvl)
propagate_state(self.reactor_to_turbine)
self.turbine.initialize(outlvl=outlvl)
with idaeslog.solver_log(init_log, idaeslog.DEBUG) as slc:
res = solver.solve(self, tee=slc.tee)
init_log.info("Hydrogen Turbine initialization status {}.".format(
idaeslog.condition(res)))
def test_propagate_state_Expression():
m = ConcreteModel()
def block_rule(b):
b.s = Set(initialize=[1, 2])
b.v1 = Var()
b.v2 = Var(b.s)
b.e = Expression(expr=b.v1)
b.p = Port()
b.p.add(b.e, "E")
b.p.add(b.v2, "V2")
return
m.b1 = Block(rule=block_rule)
m.b2 = Block(rule=block_rule)
m.s1 = Arc(source=m.b1.p, destination=m.b2.p)
with pytest.raises(TypeError):
propagate_state(m.s1)
def test_propagate_state_indexed():
m = ConcreteModel()
def block_rule(b):
b.s = Set(initialize=[1, 2])
b.v1 = Var()
b.v2 = Var(b.s)
b.p = Port(b.s)
b.p[1].add(b.v1, "V1")
b.p[2].add(b.v2, "V2")
return
m.b1 = Block(rule=block_rule)
m.b2 = Block(rule=block_rule)
def arc_rule(m, i):
return {'source': m.b1.p[i], 'destination': m.b2.p[i]}
m.s1 = Arc([1, 2], rule=arc_rule)
with pytest.raises(AttributeError):
propagate_state(m.s1)
def solve_flowsheet(**desal_kwargs):
m = ConcreteModel()
m.fs = FlowsheetBlock(default={"dynamic": False})
build(m, **desal_kwargs)
TransformationFactory("network.expand_arcs").apply_to(m)
# scale
scale(m, **desal_kwargs)
calculate_scaling_factors(m)
# initialize
m.fs.feed.initialize()
propagate_state(m.fs.s_pretrt_tb)
initialize(m, **desal_kwargs)
check_dof(m)
solve_block(m, tee=False, fail_flag=True)
# report
print("==================================="
"\n Simulation ")
report(m, **desal_kwargs)
return m
def initialize(m):
# initialize feed
m.fs.feed.initialize()
propagate_state(m.fs.s_prtrt_feed_mixer)
# initializer mixer
pssb.initialize_stoich_softening_mixer(m.fs.stoich_softening_mixer_unit, debug_out=False)
# initializer reactor
propagate_state(m.fs.stoich_softening_arc_mixer_to_reactor)
pssb.initialize_stoich_softening_reactor(m.fs.stoich_softening_reactor_unit, debug_out=False)
# initializer separator
propagate_state(m.fs.stoich_softening_arc_reactor_to_separator)
pssb.initialize_stoich_softening_separator(m.fs.stoich_softening_separator_unit, debug_out=False)
def initialize_model(m):
m.fs.pem.initialize()
propagate_state(m.fs.pem_to_translator)
m.fs.translator.initialize()
# Initialize mixer
propagate_state(m.fs.translator_to_mixer)
m.fs.mixer.initialize()
# Begin Initialization and solve for the system.
propagate_state(m.fs.mixer_to_turbine)
m.fs.h2_turbine.initialize()
return m
def _init_section(
self,
stages,
splits,
disconnects,
prev_port,
outlvl,
solver,
optarg,
copy_disconneted_flow,
copy_disconneted_pressure,
):
""" Reuse the initializtion for HP, IP and, LP sections.
"""
if 0 in splits:
propagate_state(splits[0].inlet, prev_port)
splits[0].initialize(outlvl=outlvl, solver=solver, optarg=optarg)
prev_port = splits[0].outlet_1
for i in stages:
if i - 1 not in disconnects:
propagate_state(stages[i].inlet, prev_port)
else:
if copy_disconneted_flow:
for t in stages[i].inlet.flow_mol:
stages[i].inlet.flow_mol[t] = pyo.value(
prev_port.flow_mol[t])
if copy_disconneted_pressure:
for t in stages[i].inlet.pressure:
stages[i].inlet.pressure[t] = pyo.value(
prev_port.pressure[t])
stages[i].initialize(outlvl=outlvl, solver=solver, optarg=optarg)
prev_port = stages[i].outlet
if i in splits:
propagate_state(splits[i].inlet, prev_port)
splits[i].initialize(outlvl=outlvl,
solver=solver,
optarg=optarg)
prev_port = splits[i].outlet_1
return prev_port
def initialize(m, **kwargs):
propagate_state(m.fs.s_tb_desal)
desalination.initialize_desalination(m, **kwargs)
m.fs.desal_saturation.properties.initialize()
def initialize_pretreatment_NF(m, **kwargs):
optarg = {"nlp_scaling_method": "user-scaling"}
if kwargs["has_bypass"]:
m.fs.feed.initialize(optarg=optarg)
propagate_state(m.fs.s_pretrt_feed_splitter)
m.fs.splitter.initialize(optarg=optarg)
propagate_state(m.fs.s_pretrt_splitter_mixer)
if kwargs["NF_type"] == "ZO":
propagate_state(m.fs.s_pretrt_splitter_pumpNF)
m.fs.pump_NF.initialize(optarg=optarg)
propagate_state(m.fs.s_pretrt_pumpNF_NF)
m.fs.NF.initialize(optarg=optarg)
else: # NF_type == 'Sep'
propagate_state(m.fs.s_pretrt_splitter_NF)
# m.fs.NF.initialize(optarg=optarg) # IDAES error when NF is a separator TODO: address in IDAES
propagate_state(m.fs.s_pretrt_NF_mixer)
m.fs.mixer.initialize(optarg=optarg)
else: # no bypass
m.fs.feed.initialize(optarg=optarg)
if kwargs["NF_type"] == "ZO":
propagate_state(m.fs.s_pretrt_feed_pumpNF)
m.fs.pump_NF.initialize(optarg=optarg)
propagate_state(m.fs.s_pretrt_pumpNF_NF)
m.fs.NF.initialize(optarg=optarg)
else: # NF_type == 'Sep'
propagate_state(m.fs.s_pretrt_feed_NF)
def do_initialization_pass(m, optarg, guess_mixers):
# start with the feed
m.fs.feed.initialize(optarg=optarg)
propagate_state(m.fs.feed_to_pump)
last_stage = m.fs.StageSet.last()
first_stage = m.fs.StageSet.first()
for stage in m.fs.StageSet:
m.fs.PrimaryPumps[stage].initialize(optarg=optarg)
if stage == last_stage:
propagate_state(m.fs.pump_to_stage)
else:
propagate_state(m.fs.pump_to_mixer[stage])
if guess_mixers:
_lsrro_mixer_guess_initializer( m.fs.Mixers[stage],
solvent_multiplier=0.5, solute_multiplier=0.2, optarg=optarg )
else:
m.fs.Mixers[stage].initialize(optarg=optarg)
propagate_state(m.fs.mixer_to_stage[stage])
m.fs.ROUnits[stage].initialize(optarg=optarg)
if stage == first_stage:
propagate_state(m.fs.primary_RO_to_product)
else:
propagate_state(m.fs.stage_to_eq_pump[stage])
m.fs.BoosterPumps[stage].initialize(optarg=optarg)
propagate_state(m.fs.eq_pump_to_mixer[stage])
if stage == last_stage:
propagate_state(m.fs.stage_to_erd)
else:
propagate_state(m.fs.stage_to_pump[stage])
# for the end stage
propagate_state(m.fs.erd_to_disposal)
def initialize_system(m, solver_dict=None):
solver_str = solver_dict['solver_str']
solver_opt = solver_dict['solver_opt']
solver = solver_dict['solver']
# ---initialize feed block---
m.fs.feed.initialize(solver=solver_str, optarg=solver_opt)
# ---initialize splitter and pressure exchanger---
# pressure exchanger high pressure inlet
propagate_state(
m.fs.s06) # propagate to PXR high pressure inlet from RO retentate
m.fs.PXR.high_pressure_side.properties_in.initialize(solver=solver_str,
optarg=solver_opt)
# splitter inlet
propagate_state(m.fs.s01) # propagate to splitter inlet from feed
m.fs.S1.mixed_state[
0].mass_frac_phase_comp # touch property, so that it is built and can be solved for
m.fs.S1.mixed_state.initialize(solver=solver_str, optarg=solver_opt)
# splitter outlet to PXR, enforce same flow_vol as PXR high pressure inlet
m.fs.S1.PXR_state[0].pressure.fix(value(m.fs.S1.mixed_state[0].pressure))
m.fs.S1.PXR_state[0].temperature.fix(
value(m.fs.S1.mixed_state[0].temperature))
m.fs.S1.PXR_state[0].flow_vol_phase['Liq'].fix(
value(m.fs.PXR.high_pressure_side.properties_in[0].
flow_vol_phase['Liq']))
m.fs.S1.PXR_state[0].mass_frac_phase_comp['Liq', 'NaCl'].fix(
value(m.fs.S1.mixed_state[0].mass_frac_phase_comp['Liq', 'NaCl']))
check_dof(m.fs.S1.PXR_state[0])
results = solve_indexed_blocks(solver, [m.fs.S1.PXR_state])
check_solve(results)
# unfix PXR_state state variables and properties
m.fs.S1.PXR_state[0].pressure.unfix()
m.fs.S1.PXR_state[0].temperature.unfix()
m.fs.S1.PXR_state[0].flow_vol_phase['Liq'].unfix()
m.fs.S1.PXR_state[0].mass_frac_phase_comp['Liq', 'NaCl'].unfix()
m.fs.S1.PXR_state[0].flow_mass_phase_comp['Liq', 'NaCl'].fix()
# splitter initialization
m.fs.S1.initialize(solver=solver_str, optarg=solver_opt)
m.fs.S1.PXR_state[0].flow_mass_phase_comp['Liq', 'NaCl'].unfix()
# pressure exchanger low pressure inlet
propagate_state(m.fs.s08)
# pressure exchanger initialization
m.fs.PXR.initialize(solver=solver_str, optarg=solver_opt)
# ---initialize pump 1---
propagate_state(m.fs.s02)
m.fs.P1.initialize(solver=solver_str, optarg=solver_opt)
# ---initialize pump 2---
propagate_state(m.fs.s09)
m.fs.P2.control_volume.properties_out[0].pressure.fix(
value(m.fs.P2.control_volume.properties_out[0].pressure))
m.fs.P2.initialize(solver=solver_str, optarg=solver_opt)
m.fs.P2.control_volume.properties_out[0].pressure.unfix()
# ---initialize mixer---
propagate_state(m.fs.s03)
propagate_state(m.fs.s10)
m.fs.M1.initialize(solver=solver_str,
optarg=solver_opt,
outlvl=idaeslog.INFO)
def test_propagate_state_invalid_stream():
m = ConcreteModel()
with pytest.raises(RuntimeError):
propagate_state(m)
def create_model(
time_set=None,
time_units=pyo.units.s,
nfe=5,
tee=False,
calc_integ=True,
):
"""Create a test model and solver
Args:
time_set (list): The beginning and end point of the time domain
time_units (Pyomo Unit object): Units of time domain
nfe (int): Number of finite elements argument for the DAE
transformation.
calc_integ (bool): If True, calculate in the initial condition for
the integral term, else use a fixed variable (fs.ctrl.err_i0),
False is the better option if you have a value from a previous
time period
Returns
(tuple): (ConcreteModel, Solver)
"""
fs_cfg = {"dynamic": True, "time_set": time_set, "time_units": time_units}
model_name = "Steam Tank, Dynamic"
if time_set is None:
time_set = [0, 3]
m = pyo.ConcreteModel(name=model_name)
m.fs = FlowsheetBlock(default=fs_cfg)
# Create a property parameter block
m.fs.prop_water = iapws95.Iapws95ParameterBlock(
default={"phase_presentation": iapws95.PhaseType.LG})
# Create the valve and tank models
m.fs.valve_1 = Valve(
default={
"dynamic": False,
"has_holdup": False,
"pressure_flow_callback": _valve_pressure_flow_cb,
"material_balance_type": MaterialBalanceType.componentTotal,
"property_package": m.fs.prop_water,
})
m.fs.tank = Heater(
default={
"has_holdup": True,
"material_balance_type": MaterialBalanceType.componentTotal,
"property_package": m.fs.prop_water,
})
m.fs.valve_2 = Valve(
default={
"dynamic": False,
"has_holdup": False,
"pressure_flow_callback": _valve_pressure_flow_cb,
"material_balance_type": MaterialBalanceType.componentTotal,
"property_package": m.fs.prop_water,
})
# Add a controller
m.fs.ctrl = PIDController(
default={
"process_var": m.fs.tank.control_volume.properties_out[:].pressure,
"manipulated_var": m.fs.valve_1.valve_opening,
"calculate_initial_integral": calc_integ,
"mv_bound_type": ControllerMVBoundType.SMOOTH_BOUND,
"type": ControllerType.PI, # rather use PI, but testing all terms
})
# The control volume block doesn't assume the two phases are in equilibrium
# by default, so I'll make that assumption here, I don't actually expect
# liquid to form but who knows. The phase_fraction in the control volume is
# volumetric phase fraction hence the densities.
@m.fs.tank.Constraint(m.fs.time)
def vol_frac_vap(b, t):
return (b.control_volume.properties_out[t].phase_frac["Vap"] *
b.control_volume.properties_out[t].dens_mol /
b.control_volume.properties_out[t].dens_mol_phase["Vap"]) == (
b.control_volume.phase_fraction[t, "Vap"])
# Connect the models
m.fs.v1_to_tank = Arc(source=m.fs.valve_1.outlet,
destination=m.fs.tank.inlet)
m.fs.tank_to_v2 = Arc(source=m.fs.tank.outlet,
destination=m.fs.valve_2.inlet)
# Add the stream constraints and do the DAE transformation
pyo.TransformationFactory("network.expand_arcs").apply_to(m.fs)
pyo.TransformationFactory("dae.finite_difference").apply_to(
m.fs, nfe=nfe, wrt=m.fs.time, scheme="BACKWARD")
# Fix the derivative variables to zero at time 0 (steady state assumption)
m.fs.fix_initial_conditions()
# Fix the input variables
m.fs.valve_1.inlet.enth_mol.fix(50000)
m.fs.valve_1.inlet.pressure.fix(5e5)
m.fs.valve_2.outlet.pressure.fix(101325)
m.fs.valve_1.Cv.fix(0.001)
m.fs.valve_2.Cv.fix(0.001)
m.fs.valve_1.valve_opening.fix(1)
m.fs.valve_2.valve_opening.fix(1)
m.fs.tank.heat_duty.fix(0)
m.fs.tank.control_volume.volume.fix(2.0)
#Fix controller settings
m.fs.ctrl.gain_p.fix(1e-6)
m.fs.ctrl.gain_i.fix(1e-5)
#m.fs.ctrl.gain_d.fix(1e-6)
#m.fs.ctrl.derivative_of_error[m.fs.time.first()].fix(0)
m.fs.ctrl.setpoint.fix(3e5)
m.fs.ctrl.mv_ref.fix(0)
m.fs.ctrl.mv_lb = 0.0
m.fs.ctrl.mv_ub = 1.0
for t in m.fs.time:
m.fs.valve_1.inlet.flow_mol[t] = 100 # initial guess on flow
# simple initialize
m.fs.valve_1.initialize()
propagate_state(m.fs.v1_to_tank)
m.fs.tank.initialize()
propagate_state(m.fs.tank_to_v2)
# Can't specify both flow and outlet pressure so free the outlet pressure
# for initialization and refix it after. Inlet flow gets fixed in init, but
# is unfixed for the final problem
m.fs.valve_2.outlet.pressure.unfix()
m.fs.valve_2.initialize()
m.fs.valve_2.outlet.pressure.fix(101325)
m.fs.valve_1.valve_opening.unfix()
m.fs.valve_1.valve_opening[m.fs.time.first()].fix()
# Return the model and solver
return m
def fix_dof_and_initialize(m, **kwargs):
"""
This function fixes the degrees of freedom of each unit and initializes it
np_power_output : Power output from nuclear power plant in kW
pem_outlet_pressure : Outlet pressure of hydrogen from PEM in bar
pem_outlet_temperature: Outlet temperature of hydrogen from PEM in K
air_h2_ratio : Ratio of molar flowrate of air to molar flowrate of hydrogen
entering the hydrogen turbine
compressor_dp : Pressure difference (in bar) between the outlet and the inlet of
the hydrogen turbine's compressor. The same pressure difference
is used for hydrogen turbine's turbine.
"""
options = kwargs.get("options", {})
np_power_output = options.get("np_power_output", 1000 * 1e3)
pem_outlet_pressure = options.get("pem_outlet_pressure", 1.01325)
pem_outlet_temperature = options.get("pem_outlet_temperature", 300)
air_h2_ratio = options.get("air_h2_ratio", 10.76)
compressor_dp = options.get("compressor_dp", 24.01)
# Fix the dof of the electrical splitter and initialize
m.fs.np_power_split.electricity[0].fix(np_power_output) # in kW
m.fs.np_power_split.split_fraction["np_to_grid", 0].fix(0.8)
m.fs.np_power_split.initialize()
# Fix the dof of the electrolyzer and initialize
# Conversion of kW to mol/sec of H2 based on H-tec design of 54.517kW-hr/kg
m.fs.pem.electricity_to_mol.fix(0.002527406)
m.fs.pem.outlet.pressure.fix(pem_outlet_pressure * 1e5)
m.fs.pem.outlet.temperature.fix(pem_outlet_temperature)
propagate_state(m.fs.arc_np_to_pem)
m.fs.pem.initialize()
# Fix the dof of the tank and initialize
m.fs.h2_tank.dt.fix(3600)
m.fs.h2_tank.tank_holdup_previous.fix(0)
m.fs.h2_tank.outlet_to_turbine.flow_mol.fix(10)
m.fs.h2_tank.outlet_to_pipeline.flow_mol.fix(10)
m.fs.h2_tank.outlet_to_turbine.mole_frac_comp[0, "hydrogen"].fix(1)
m.fs.h2_tank.outlet_to_pipeline.mole_frac_comp[0, "hydrogen"].fix(1)
propagate_state(m.fs.arc_pem_to_h2_tank)
m.fs.h2_tank.initialize()
# Fix the dof of the translator block and initialize
m.fs.translator.outlet.mole_frac_comp[0, "hydrogen"].fix(0.99)
m.fs.translator.outlet.mole_frac_comp[0, "oxygen"].fix(0.01 / 4)
m.fs.translator.outlet.mole_frac_comp[0, "argon"].fix(0.01 / 4)
m.fs.translator.outlet.mole_frac_comp[0, "nitrogen"].fix(0.01 / 4)
m.fs.translator.outlet.mole_frac_comp[0, "water"].fix(0.01 / 4)
propagate_state(m.fs.arc_h2_tank_to_translator)
m.fs.translator.initialize()
# Fix the degrees of freedom of mixer and initialize
m.fs.mixer.air_feed.flow_mol[0].fix(
m.fs.h2_tank.outlet_to_turbine.flow_mol[0].value * air_h2_ratio
)
m.fs.mixer.air_feed.temperature[0].fix(pem_outlet_temperature)
m.fs.mixer.air_feed.pressure[0].fix(pem_outlet_pressure * 1e5)
m.fs.mixer.air_feed.mole_frac_comp[0, "oxygen"].fix(0.2054)
m.fs.mixer.air_feed.mole_frac_comp[0, "argon"].fix(0.0032)
m.fs.mixer.air_feed.mole_frac_comp[0, "nitrogen"].fix(0.7672)
m.fs.mixer.air_feed.mole_frac_comp[0, "water"].fix(0.0240)
m.fs.mixer.air_feed.mole_frac_comp[0, "hydrogen"].fix(2e-4)
propagate_state(m.fs.arc_translator_to_mixer)
m.fs.mixer.initialize()
# Fix the degrees of freedom of H2 turbine and initialize
m.fs.h2_turbine.compressor.deltaP.fix(compressor_dp * 1e5)
m.fs.h2_turbine.compressor.efficiency_isentropic.fix(0.86)
m.fs.h2_turbine.stoic_reactor.conversion.fix(0.99)
m.fs.h2_turbine.turbine.deltaP.fix(-compressor_dp * 1e5)
m.fs.h2_turbine.turbine.efficiency_isentropic.fix(0.89)
propagate_state(m.fs.arc_mixer_to_h2_turbine)
m.fs.h2_turbine.initialize()
return
def test_propagate_state():
m = ConcreteModel()
def block_rule(b):
b.s = Set(initialize=[1, 2])
b.v1 = Var()
b.v2 = Var(b.s)
b.e1 = Expression(expr=b.v1)
@b.Expression(b.s)
def e2(blk, i):
return b.v2[i] * b.v1
b.p1 = Param(mutable=True, initialize=5)
b.p2 = Param(b.s, mutable=True, initialize=6)
b.port1 = Port()
b.port1.add(b.v1, "V1")
b.port1.add(b.v2, "V2")
b.port2 = Port()
b.port2.add(b.v1, "V1")
b.port2.add(b.e2, "V2")
b.port3 = Port()
b.port3.add(b.e1, "V1")
b.port3.add(b.v2, "V2")
b.port4 = Port()
b.port4.add(b.p1, "V1")
b.port4.add(b.v2, "V2")
b.port5 = Port()
b.port5.add(b.v1, "V1")
b.port5.add(b.p2, "V2")
b.port6 = Port()
b.port6.add(b.v1, "V1")
b.port6.add(b.v1, "V2")
return
m.b1 = Block(rule=block_rule)
m.b2 = Block(rule=block_rule)
m.s1 = Arc(source=m.b1.port1, destination=m.b2.port1)
m.s2 = Arc(source=m.b1.port1, destination=m.b2.port2)
m.s3 = Arc(source=m.b1.port1, destination=m.b2.port3)
m.s4 = Arc(source=m.b1.port1, destination=m.b2.port4)
m.s5 = Arc(source=m.b1.port1, destination=m.b2.port5)
m.s6 = Arc(source=m.b1.port2, destination=m.b2.port1)
m.s7 = Arc(source=m.b1.port3, destination=m.b2.port1)
m.s8 = Arc(source=m.b1.port4, destination=m.b2.port1)
m.s9 = Arc(source=m.b1.port5, destination=m.b2.port1)
m.s10 = Arc(source=m.b1.port6, destination=m.b2.port1)
m.s11 = Arc(source=m.b2.port6, destination=m.b1.port1)
# Set values on first block
m.b1.v1.value = 10
m.b1.v2[1].value = 20
m.b1.v2[2].value = 30
# Make sure vars in block 2 haven't been changed accidentally
assert m.b2.v1.value is None
assert m.b2.v2[1].value is None
assert m.b2.v2[2].value is None
propagate_state(m.s1)
# Check that values were propagated correctly
assert m.b2.v1.value == m.b1.v1.value
assert m.b2.v2[1].value == m.b1.v2[1].value
assert m.b2.v2[2].value == m.b1.v2[2].value
assert m.b1.v1.fixed is False
assert m.b1.v2[1].fixed is False
assert m.b1.v2[2].fixed is False
assert m.b2.v1.fixed is False
assert m.b2.v2[1].fixed is False
assert m.b2.v2[2].fixed is False
with pytest.raises(TypeError):
propagate_state(m.s2)
with pytest.raises(TypeError):
propagate_state(m.s3)
with pytest.raises(TypeError):
propagate_state(m.s4)
with pytest.raises(TypeError):
propagate_state(m.s5)
propagate_state(m.s6)
assert value(m.b1.v1) == value(m.b2.v1)
assert value(m.b1.e2[1]) == value(m.b2.v2[1])
assert value(m.b1.e2[2]) == value(m.b2.v2[2])
propagate_state(m.s7)
assert value(m.b1.e1) == value(m.b2.v1)
assert value(m.b1.v2[1]) == value(m.b2.v2[1])
assert value(m.b1.v2[2]) == value(m.b2.v2[2])
propagate_state(m.s8)
assert value(m.b1.p1) == value(m.b2.v1)
assert value(m.b1.v2[1]) == value(m.b2.v2[1])
assert value(m.b1.v2[2]) == value(m.b2.v2[2])
propagate_state(m.s9)
assert value(m.b1.v1) == value(m.b2.v1)
assert value(m.b1.p2[1]) == value(m.b2.v2[1])
assert value(m.b1.p2[2]) == value(m.b2.v2[2])
with pytest.raises(KeyError):
propagate_state(m.s10)
with pytest.raises(KeyError):
propagate_state(m.s11)
def test_ASM1_reactor():
m = pyo.ConcreteModel()
m.fs = FlowsheetBlock(default={"dynamic": False})
m.fs.props = ASM1ParameterBlock()
m.fs.rxn_props = ASM1ReactionParameterBlock(
default={"property_package": m.fs.props})
m.fs.R1 = CSTR(default={
"property_package": m.fs.props,
"reaction_package": m.fs.rxn_props,
})
m.fs.R2 = CSTR(default={
"property_package": m.fs.props,
"reaction_package": m.fs.rxn_props,
})
m.fs.R3 = CSTR(default={
"property_package": m.fs.props,
"reaction_package": m.fs.rxn_props,
})
m.fs.R4 = CSTR(default={
"property_package": m.fs.props,
"reaction_package": m.fs.rxn_props,
})
m.fs.R5 = CSTR(default={
"property_package": m.fs.props,
"reaction_package": m.fs.rxn_props,
})
# Link units
m.fs.stream1 = Arc(source=m.fs.R1.outlet, destination=m.fs.R2.inlet)
m.fs.stream2 = Arc(source=m.fs.R2.outlet, destination=m.fs.R3.inlet)
m.fs.stream3 = Arc(source=m.fs.R3.outlet, destination=m.fs.R4.inlet)
m.fs.stream4 = Arc(source=m.fs.R4.outlet, destination=m.fs.R5.inlet)
pyo.TransformationFactory("network.expand_arcs").apply_to(m)
assert_units_consistent(m)
# Feed conditions based on manual mass balance of inlet and recycle streams
m.fs.R1.inlet.flow_vol.fix(92230 * pyo.units.m**3 / pyo.units.day)
m.fs.R1.inlet.temperature.fix(298.15 * pyo.units.K)
m.fs.R1.inlet.pressure.fix(1 * pyo.units.atm)
m.fs.R1.inlet.conc_mass_comp[0,
"S_I"].fix(30 * pyo.units.g / pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "S_S"].fix(14.6112 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "X_I"].fix(1149 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "X_S"].fix(89.324 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "X_BH"].fix(2542.03 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "X_BA"].fix(148.6 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0,
"X_P"].fix(448 * pyo.units.g / pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "S_O"].fix(0.3928 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "S_NO"].fix(8.32 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "S_NH"].fix(7.696 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "S_ND"].fix(1.9404 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.conc_mass_comp[0, "X_ND"].fix(5.616 * pyo.units.g /
pyo.units.m**3)
m.fs.R1.inlet.alkalinity.fix(4.704 * pyo.units.mol / pyo.units.m**3)
m.fs.R1.volume.fix(1000 * pyo.units.m**3)
m.fs.R2.volume.fix(1000 * pyo.units.m**3)
m.fs.R3.volume.fix(1333 * pyo.units.m**3)
m.fs.R4.volume.fix(1333 * pyo.units.m**3)
m.fs.R5.volume.fix(1333 * pyo.units.m**3)
assert degrees_of_freedom(m) == 0
# Initialize flowsheet
m.fs.R1.initialize()
propagate_state(m.fs.stream1)
m.fs.R2.initialize()
propagate_state(m.fs.stream2)
m.fs.R3.initialize()
propagate_state(m.fs.stream3)
m.fs.R4.initialize()
propagate_state(m.fs.stream4)
m.fs.R5.initialize()
# For aerobic reactors, need to fix the oxygen concentration in outlet
# To do this, we also need to deactivate the constraint linking O2 from
# the previous unit
# Doing this before initialization will cause issues with DoF however
m.fs.R3.outlet.conc_mass_comp[0, "S_O"].fix(1.72 * pyo.units.g /
pyo.units.m**3)
m.fs.stream2.expanded_block.conc_mass_comp_equality[0, "S_O"].deactivate()
m.fs.R4.outlet.conc_mass_comp[0, "S_O"].fix(2.43 * pyo.units.g /
pyo.units.m**3)
m.fs.stream3.expanded_block.conc_mass_comp_equality[0, "S_O"].deactivate()
m.fs.R5.outlet.conc_mass_comp[0, "S_O"].fix(0.491 * pyo.units.g /
pyo.units.m**3)
m.fs.stream4.expanded_block.conc_mass_comp_equality[0, "S_O"].deactivate()
solver = get_solver()
results = solver.solve(m, tee=True)
assert pyo.check_optimal_termination(results)
# Verify results against reference
# First reactor (anoxic)
assert pyo.value(m.fs.R1.outlet.flow_vol[0]) == pytest.approx(1.0675,
rel=1e-4)
assert pyo.value(m.fs.R1.outlet.temperature[0]) == pytest.approx(298.15,
rel=1e-4)
assert pyo.value(m.fs.R1.outlet.pressure[0]) == pytest.approx(101325,
rel=1e-4)
assert pyo.value(m.fs.R1.outlet.conc_mass_comp[0, "S_I"]) == pytest.approx(
30e-3, rel=1e-5)
assert pyo.value(m.fs.R1.outlet.conc_mass_comp[0, "S_S"]) == pytest.approx(
2.81e-3, rel=1e-2)
assert pyo.value(m.fs.R1.outlet.conc_mass_comp[0, "X_I"]) == pytest.approx(
1149e-3, rel=1e-3)
assert pyo.value(m.fs.R1.outlet.conc_mass_comp[0, "X_S"]) == pytest.approx(
82.1e-3, rel=1e-2)
assert pyo.value(
m.fs.R1.outlet.conc_mass_comp[0, "X_BH"]) == pytest.approx(2552e-3,
rel=1e-3)
assert pyo.value(
m.fs.R1.outlet.conc_mass_comp[0, "X_BA"]) == pytest.approx(149e-3,
rel=1e-2)
assert pyo.value(m.fs.R1.outlet.conc_mass_comp[0, "X_P"]) == pytest.approx(
449e-3, rel=1e-2)
assert pyo.value(m.fs.R1.outlet.conc_mass_comp[0, "S_O"]) == pytest.approx(
4.3e-6, rel=1e-2)
assert pyo.value(
m.fs.R1.outlet.conc_mass_comp[0, "S_NO"]) == pytest.approx(5.36e-3,
rel=1e-2)
assert pyo.value(
m.fs.R1.outlet.conc_mass_comp[0, "S_NH"]) == pytest.approx(7.92e-3,
rel=1e-2)
assert pyo.value(
m.fs.R1.outlet.conc_mass_comp[0, "S_ND"]) == pytest.approx(1.22e-3,
rel=1e-2)
assert pyo.value(
m.fs.R1.outlet.conc_mass_comp[0, "X_ND"]) == pytest.approx(5.29e-3,
rel=1e-2)
assert pyo.value(m.fs.R1.outlet.alkalinity[0]) == pytest.approx(4.93e-3,
rel=1e-2)
# Second reactor (anoixic)
assert pyo.value(m.fs.R2.outlet.flow_vol[0]) == pytest.approx(1.0675,
rel=1e-4)
assert pyo.value(m.fs.R2.outlet.temperature[0]) == pytest.approx(298.15,
rel=1e-4)
assert pyo.value(m.fs.R2.outlet.pressure[0]) == pytest.approx(101325,
rel=1e-4)
assert pyo.value(m.fs.R2.outlet.conc_mass_comp[0, "S_I"]) == pytest.approx(
30e-3, rel=1e-5)
assert pyo.value(m.fs.R2.outlet.conc_mass_comp[0, "S_S"]) == pytest.approx(
1.46e-3, rel=1e-2)
assert pyo.value(m.fs.R2.outlet.conc_mass_comp[0, "X_I"]) == pytest.approx(
1149e-3, rel=1e-3)
assert pyo.value(m.fs.R2.outlet.conc_mass_comp[0, "X_S"]) == pytest.approx(
76.4e-3, rel=1e-2)
assert pyo.value(
m.fs.R2.outlet.conc_mass_comp[0, "X_BH"]) == pytest.approx(2553e-3,
rel=1e-3)
assert pyo.value(
m.fs.R2.outlet.conc_mass_comp[0, "X_BA"]) == pytest.approx(148e-3,
rel=1e-2)
assert pyo.value(m.fs.R2.outlet.conc_mass_comp[0, "X_P"]) == pytest.approx(
449e-3, rel=1e-2)
assert pyo.value(m.fs.R2.outlet.conc_mass_comp[0, "S_O"]) == pytest.approx(
6.31e-8, rel=1e-2)
assert pyo.value(
m.fs.R2.outlet.conc_mass_comp[0, "S_NO"]) == pytest.approx(3.65e-3,
rel=1e-2)
assert pyo.value(
m.fs.R2.outlet.conc_mass_comp[0, "S_NH"]) == pytest.approx(8.34e-3,
rel=1e-2)
assert pyo.value(
m.fs.R2.outlet.conc_mass_comp[0, "S_ND"]) == pytest.approx(0.882e-3,
rel=1e-2)
assert pyo.value(
m.fs.R2.outlet.conc_mass_comp[0, "X_ND"]) == pytest.approx(5.03e-3,
rel=1e-2)
assert pyo.value(m.fs.R2.outlet.alkalinity[0]) == pytest.approx(5.08e-3,
rel=1e-2)
# Third reactor (aerobic)
assert pyo.value(m.fs.R3.outlet.flow_vol[0]) == pytest.approx(1.0675,
rel=1e-4)
assert pyo.value(m.fs.R3.outlet.temperature[0]) == pytest.approx(298.15,
rel=1e-4)
assert pyo.value(m.fs.R3.outlet.pressure[0]) == pytest.approx(101325,
rel=1e-4)
assert pyo.value(m.fs.R3.outlet.conc_mass_comp[0, "S_I"]) == pytest.approx(
30e-3, rel=1e-5)
assert pyo.value(m.fs.R3.outlet.conc_mass_comp[0, "S_S"]) == pytest.approx(
1.15e-3, rel=1e-2)
assert pyo.value(m.fs.R3.outlet.conc_mass_comp[0, "X_I"]) == pytest.approx(
1149e-3, rel=1e-3)
assert pyo.value(m.fs.R3.outlet.conc_mass_comp[0, "X_S"]) == pytest.approx(
64.9e-3, rel=1e-2)
assert pyo.value(
m.fs.R3.outlet.conc_mass_comp[0, "X_BH"]) == pytest.approx(2557e-3,
rel=1e-3)
assert pyo.value(
m.fs.R3.outlet.conc_mass_comp[0, "X_BA"]) == pytest.approx(149e-3,
rel=1e-2)
assert pyo.value(m.fs.R3.outlet.conc_mass_comp[0, "X_P"]) == pytest.approx(
450e-3, rel=1e-2)
assert pyo.value(m.fs.R3.outlet.conc_mass_comp[0, "S_O"]) == pytest.approx(
1.72e-3, rel=1e-2)
assert pyo.value(
m.fs.R3.outlet.conc_mass_comp[0, "S_NO"]) == pytest.approx(6.54e-3,
rel=1e-2)
assert pyo.value(
m.fs.R3.outlet.conc_mass_comp[0, "S_NH"]) == pytest.approx(5.55e-3,
rel=1e-2)
assert pyo.value(
m.fs.R3.outlet.conc_mass_comp[0, "S_ND"]) == pytest.approx(0.829e-3,
rel=1e-2)
assert pyo.value(
m.fs.R3.outlet.conc_mass_comp[0, "X_ND"]) == pytest.approx(4.39e-3,
rel=1e-2)
assert pyo.value(m.fs.R3.outlet.alkalinity[0]) == pytest.approx(4.67e-3,
rel=1e-2)
# Fourth reactor (aerobic)
assert pyo.value(m.fs.R4.outlet.flow_vol[0]) == pytest.approx(1.0675,
rel=1e-4)
assert pyo.value(m.fs.R4.outlet.temperature[0]) == pytest.approx(298.15,
rel=1e-4)
assert pyo.value(m.fs.R4.outlet.pressure[0]) == pytest.approx(101325,
rel=1e-4)
assert pyo.value(m.fs.R4.outlet.conc_mass_comp[0, "S_I"]) == pytest.approx(
30e-3, rel=1e-5)
assert pyo.value(m.fs.R4.outlet.conc_mass_comp[0, "S_S"]) == pytest.approx(
0.995e-3, rel=1e-2)
assert pyo.value(m.fs.R4.outlet.conc_mass_comp[0, "X_I"]) == pytest.approx(
1149e-3, rel=1e-3)
assert pyo.value(m.fs.R4.outlet.conc_mass_comp[0, "X_S"]) == pytest.approx(
55.7e-3, rel=1e-2)
assert pyo.value(
m.fs.R4.outlet.conc_mass_comp[0, "X_BH"]) == pytest.approx(2559e-3,
rel=1e-3)
assert pyo.value(
m.fs.R4.outlet.conc_mass_comp[0, "X_BA"]) == pytest.approx(150e-3,
rel=1e-2)
assert pyo.value(m.fs.R4.outlet.conc_mass_comp[0, "X_P"]) == pytest.approx(
451e-3, rel=1e-2)
assert pyo.value(m.fs.R4.outlet.conc_mass_comp[0, "S_O"]) == pytest.approx(
2.43e-3, rel=1e-2)
assert pyo.value(
m.fs.R4.outlet.conc_mass_comp[0, "S_NO"]) == pytest.approx(9.30e-3,
rel=1e-2)
assert pyo.value(
m.fs.R4.outlet.conc_mass_comp[0, "S_NH"]) == pytest.approx(2.97e-3,
rel=1e-2)
assert pyo.value(
m.fs.R4.outlet.conc_mass_comp[0, "S_ND"]) == pytest.approx(0.767e-3,
rel=1e-2)
assert pyo.value(
m.fs.R4.outlet.conc_mass_comp[0, "X_ND"]) == pytest.approx(3.88e-3,
rel=1e-2)
assert pyo.value(m.fs.R4.outlet.alkalinity[0]) == pytest.approx(4.29e-3,
rel=1e-2)
# Fifth reactor (aerobic)
assert pyo.value(m.fs.R5.outlet.flow_vol[0]) == pytest.approx(1.0675,
rel=1e-4)
assert pyo.value(m.fs.R5.outlet.temperature[0]) == pytest.approx(298.15,
rel=1e-4)
assert pyo.value(m.fs.R5.outlet.pressure[0]) == pytest.approx(101325,
rel=1e-4)
assert pyo.value(m.fs.R5.outlet.conc_mass_comp[0, "S_I"]) == pytest.approx(
30e-3, rel=1e-5)
assert pyo.value(m.fs.R5.outlet.conc_mass_comp[0, "S_S"]) == pytest.approx(
0.889e-3, rel=1e-2)
assert pyo.value(m.fs.R5.outlet.conc_mass_comp[0, "X_I"]) == pytest.approx(
1149e-3, rel=1e-3)
assert pyo.value(m.fs.R5.outlet.conc_mass_comp[0, "X_S"]) == pytest.approx(
49.3e-3, rel=1e-2)
assert pyo.value(
m.fs.R5.outlet.conc_mass_comp[0, "X_BH"]) == pytest.approx(2559e-3,
rel=1e-3)
assert pyo.value(
m.fs.R5.outlet.conc_mass_comp[0, "X_BA"]) == pytest.approx(150e-3,
rel=1e-2)
assert pyo.value(m.fs.R5.outlet.conc_mass_comp[0, "X_P"]) == pytest.approx(
452e-3, rel=1e-2)
assert pyo.value(m.fs.R5.outlet.conc_mass_comp[0, "S_O"]) == pytest.approx(
0.491e-3, rel=1e-2)
assert pyo.value(
m.fs.R5.outlet.conc_mass_comp[0, "S_NO"]) == pytest.approx(10.4e-3,
rel=1e-2)
assert pyo.value(
m.fs.R5.outlet.conc_mass_comp[0, "S_NH"]) == pytest.approx(1.73e-3,
rel=1e-2)
assert pyo.value(
m.fs.R5.outlet.conc_mass_comp[0, "S_ND"]) == pytest.approx(0.688e-3,
rel=1e-2)
assert pyo.value(
m.fs.R5.outlet.conc_mass_comp[0, "X_ND"]) == pytest.approx(3.53e-3,
rel=1e-2)
assert pyo.value(m.fs.R5.outlet.alkalinity[0]) == pytest.approx(4.13e-3,
rel=1e-2)
def initialize_desalination(m, **kwargs):
"""
Initialized the model created by build_desalination.
Arguments:
m: pyomo concrete model with a built desalination train
**kwargs: same keywords as provided to the build_desalination function
"""
optarg = {"nlp_scaling_method": "user-scaling"}
if kwargs["has_desal_feed"]:
m.fs.feed.initialize(optarg=optarg)
if kwargs["RO_type"] == "Sep":
if kwargs["has_desal_feed"]:
propagate_state(m.fs.s_desal_feed_RO)
m.fs.RO.mixed_state[
0].mass_frac_phase_comp # touch properties to have a constraint on stateblock
m.fs.RO.permeate_state[0].mass_frac_phase_comp
m.fs.RO.retentate_state[0].mass_frac_phase_comp
# m.fs.RO.initialize(optarg=optarg) # IDAES error on initializing separators, simple enough to not need it
elif kwargs["RO_type"] == "0D" or kwargs["RO_type"] == "1D":
if kwargs["has_desal_feed"]:
propagate_state(m.fs.s_desal_feed_pumpRO)
m.fs.pump_RO.initialize(optarg=optarg)
propagate_state(m.fs.s_desal_pumpRO_RO)
m.fs.RO.initialize(optarg=optarg)
if kwargs["is_twostage"]:
propagate_state(m.fs.s_desal_RO_pumpRO2)
m.fs.pump_RO2.initialize(optarg=optarg)
propagate_state(m.fs.s_desal_pumpRO2_RO2)
m.fs.RO2.initialize(optarg=optarg)
propagate_state(m.fs.s_desal_permeateRO_mixer)
propagate_state(m.fs.s_desal_permeateRO2_mixer)
m.fs.mixer_permeate.initialize(optarg=optarg)
if kwargs["has_ERD"]:
if kwargs["is_twostage"]:
propagate_state(m.fs.s_desal_RO2_ERD)
else:
propagate_state(m.fs.s_desal_RO_ERD)
m.fs.ERD.initialize(optarg=optarg)
