##############################################################################
# Institute for the Design of Advanced Energy Systems Process Systems
# Engineering Framework (IDAES PSE Framework) Copyright (c) 2018-2020, by the
# software owners: The Regents of the University of California, through
# Lawrence Berkeley National Laboratory, National Technology & Engineering
# Solutions of Sandia, LLC, Carnegie Mellon University, West Virginia
# University Research Corporation, et al. All rights reserved.
#
# Please see the files COPYRIGHT.txt and LICENSE.txt for full copyright and
# license information, respectively. Both files are also available online
# at the URL "https://github.com/IDAES/idaes-pse".
##############################################################################
"""
Base class for control volumes.
"""
__author__ = "Andrew Lee"
# Import Pyomo libraries
from pyomo.environ import Constraint, Param, Reals, units as pyunits, Var
from pyomo.dae import DerivativeVar
# Import IDAES cores
from idaes.core import (
declare_process_block_class,
ControlVolumeBlockData,
FlowDirection,
MaterialFlowBasis,
MaterialBalanceType
)
from idaes.core.util.exceptions import (
BalanceTypeNotSupportedError,
BurntToast,
ConfigurationError,
PropertyNotSupportedError
)
from idaes.core.util.tables import create_stream_table_dataframe
from idaes.core.util import scaling as iscale
import idaes.logger as idaeslog
_log = idaeslog.getLogger(__name__)
# TODO : Custom terms in material balances, other types of material balances
# TODO : Improve flexibility for get_material_flow_terms and associated
[docs]@declare_process_block_class("ControlVolume0DBlock", doc="""
ControlVolume0DBlock is a specialized Pyomo block for IDAES non-discretized
control volume blocks, and contains instances of ControlVolume0DBlockData.
ControlVolume0DBlock should be used for any control volume with a defined
volume and distinct inlets and outlets which does not require spatial
discretization. This encompases most basic unit models used in process
modeling.""")
class ControlVolume0DBlockData(ControlVolumeBlockData):
"""
0-Dimensional (Non-Discretised) ControlVolume Class
This class forms the core of all non-discretized IDAES models. It provides
methods to build property and reaction blocks, and add mass, energy and
momentum balances. The form of the terms used in these constraints is
specified in the chosen property package.
"""
[docs] def build(self):
"""
Build method for ControlVolume0DBlock blocks.
Returns:
None
"""
# Call build method from base class
super(ControlVolume0DBlockData, self).build()
[docs] def add_geometry(self):
"""
Method to create volume Var in ControlVolume.
Args:
None
Returns:
None
"""
units = self.config.property_package.get_metadata().get_derived_units
self.volume = Var(self.flowsheet().config.time, initialize=1.0,
doc='Volume of material in control volume',
units=units('volume'))
[docs] def add_state_blocks(self,
information_flow=FlowDirection.forward,
has_phase_equilibrium=None):
"""
This method constructs the inlet and outlet state blocks for the
control volume.
Args:
information_flow: a FlowDirection Enum indicating whether
information flows from inlet-to-outlet or
outlet-to-inlet
has_phase_equilibrium: indicates whether equilibrium calculations
will be required in state blocks
package_arguments: dict-like object of arguments to be passed to
state blocks as construction arguments
Returns:
None
"""
if has_phase_equilibrium is None:
raise ConfigurationError(
"{} add_state_blocks method was not provided with a "
"has_phase_equilibrium argument.".format(self.name))
elif has_phase_equilibrium not in [True, False]:
raise ConfigurationError(
"{} add_state_blocks method was provided with an invalid "
"has_phase_equilibrium argument. Must be True or False"
.format(self.name))
tmp_dict = dict(**self.config.property_package_args)
tmp_dict["has_phase_equilibrium"] = has_phase_equilibrium
# tmp_dict["parameters"] = self.config.property_package
if information_flow == FlowDirection.forward:
tmp_dict["defined_state"] = True
elif information_flow == FlowDirection.backward:
tmp_dict["defined_state"] = False
else:
raise ConfigurationError(
'{} invalid value for information_flow argument. '
'Valid values are FlowDirection.forward and '
'FlowDirection.backward'.format(self.name))
self.properties_in = (
self.config.property_package.build_state_block(
self.flowsheet().config.time,
doc="Material properties at inlet",
default=tmp_dict))
# Reverse defined_state
tmp_dict_2 = dict(**tmp_dict)
tmp_dict_2["defined_state"] = not tmp_dict["defined_state"]
self.properties_out = (
self.config.property_package.build_state_block(
self.flowsheet().config.time,
doc="Material properties at outlet",
default=tmp_dict_2))
[docs] def add_reaction_blocks(self, has_equilibrium=None):
"""
This method constructs the reaction block for the control volume.
Args:
has_equilibrium: indicates whether equilibrium calculations
will be required in reaction block
package_arguments: dict-like object of arguments to be passed to
reaction block as construction arguments
Returns:
None
"""
if has_equilibrium is None:
raise ConfigurationError(
"{} add_reaction_blocks method was not provided with a "
"has_equilibrium argument.".format(self.name))
elif has_equilibrium not in [True, False]:
raise ConfigurationError(
"{} add_reaction_blocks method was provided with an "
"invalid has_equilibrium argument. Must be True or False"
.format(self.name))
tmp_dict = dict(**self.config.reaction_package_args)
tmp_dict["state_block"] = self.properties_out
tmp_dict["has_equilibrium"] = has_equilibrium
self.reactions = (
self.config.reaction_package.build_reaction_block(
self.flowsheet().config.time,
doc="Reaction properties in control volume",
default=tmp_dict))
def _add_material_balance_common(self,
balance_type,
has_rate_reactions,
has_equilibrium_reactions,
has_phase_equilibrium,
has_mass_transfer,
custom_molar_term,
custom_mass_term):
# Get dynamic and holdup flags from config block
dynamic = self.config.dynamic
has_holdup = self.config.has_holdup
component_list = self.properties_in.component_list
phase_list = self.properties_in.phase_list
pc_set = self.properties_in.phase_component_set
# Check that reaction block exists if required
if has_rate_reactions or has_equilibrium_reactions:
try:
rblock = self.reactions
except AttributeError:
raise ConfigurationError(
"{} does not contain a Reaction Block, but material "
"balances have been set to contain reaction terms. "
"Please construct a reaction block before adding "
"balance equations.".format(self.name))
if has_equilibrium_reactions:
# Check that reaction block is set to calculate equilibrium
for t in self.flowsheet().config.time:
if self.reactions[t].config.has_equilibrium is False:
raise ConfigurationError(
"{} material balance was set to include "
"equilibrium reactions, however the associated "
"ReactionBlock was not set to include equilibrium "
"constraints (has_equilibrium_reactions=False). "
"Please correct your configuration arguments."
.format(self.name))
if has_phase_equilibrium:
# Check that state blocks are set to calculate equilibrium
for t in self.flowsheet().config.time:
if not self.properties_out[t].config.has_phase_equilibrium:
raise ConfigurationError(
"{} material balance was set to include phase "
"equilibrium, however the associated outlet "
"StateBlock was not set to include equilibrium "
"constraints (has_phase_equilibrium=False). Please"
" correct your configuration arguments."
.format(self.name))
if not self.properties_in[t].config.has_phase_equilibrium:
raise ConfigurationError(
"{} material balance was set to include phase "
"equilibrium, however the associated inlet "
"StateBlock was not set to include equilibrium "
"constraints (has_phase_equilibrium=False). Please"
" correct your configuration arguments."
.format(self.name))
# Get units from property package
units = self.config.property_package.get_metadata().get_derived_units
if (self.properties_in[self.flowsheet().config.time.first()]
.get_material_flow_basis() == MaterialFlowBasis.molar):
flow_units = units("flow_mole")
elif (self.properties_in[self.flowsheet().config.time.first()]
.get_material_flow_basis() == MaterialFlowBasis.mass):
flow_units = units("flow_mass")
else:
flow_units = None
# Get units for accumulation term if required
if self.config.dynamic:
f_time_units = self.flowsheet().config.time_units
if (f_time_units is None) ^ (units('time') is None):
raise ConfigurationError(
"{} incompatible time unit specification between "
"flowsheet and property package. Either both must use "
"units, or neither.".format(self.name))
if f_time_units is None:
acc_units = None
elif (self.properties_in[self.flowsheet().config.time.first()]
.get_material_flow_basis() == MaterialFlowBasis.molar):
acc_units = units('amount')/f_time_units
elif (self.properties_in[self.flowsheet().config.time.first()]
.get_material_flow_basis() == MaterialFlowBasis.mass):
acc_units = units('mass')/f_time_units
else:
acc_units = None
# Test for components that must exist prior to calling this method
if has_holdup:
if not hasattr(self, "volume"):
raise ConfigurationError(
"{} control volume must have volume defined to have "
"holdup and/or rate reaction terms. Please call the "
"add_geometry method before adding balance equations."
.format(self.name))
# Material holdup and accumulation
if has_holdup:
self.material_holdup = Var(self.flowsheet().config.time,
pc_set,
domain=Reals,
initialize=1.0,
doc="Material holdup in control volume",
units=units('amount'))
if dynamic:
self.material_accumulation = DerivativeVar(
self.material_holdup,
wrt=self.flowsheet().config.time,
doc="Material accumulation in control volume",
units=acc_units)
# Create material balance terms as required
# Kinetic reaction generation
if has_rate_reactions:
if not hasattr(self.config.reaction_package, "rate_reaction_idx"):
raise PropertyNotSupportedError(
"{} Reaction package does not contain a list of rate "
"reactions (rate_reaction_idx), thus does not support "
"rate-based reactions.".format(self.name))
self.rate_reaction_generation = Var(
self.flowsheet().config.time,
pc_set,
domain=Reals,
initialize=0.0,
doc="Amount of component generated in "
"unit by kinetic reactions",
units=flow_units)
# Equilibrium reaction generation
if has_equilibrium_reactions:
if not hasattr(self.config.reaction_package,
"equilibrium_reaction_idx"):
raise PropertyNotSupportedError(
"{} Reaction package does not contain a list of "
"equilibrium reactions (equilibrium_reaction_idx), thus "
"does not support equilibrium-based reactions."
.format(self.name))
self.equilibrium_reaction_generation = Var(
self.flowsheet().config.time,
pc_set,
domain=Reals,
initialize=0.0,
doc="Amount of component generated in control volume "
"by equilibrium reactions",
units=flow_units)
# Phase equilibrium generation
if has_phase_equilibrium and \
balance_type == MaterialBalanceType.componentPhase:
if not hasattr(self.config.property_package,
"phase_equilibrium_idx"):
raise PropertyNotSupportedError(
"{} Property package does not contain a list of phase "
"equilibrium reactions (phase_equilibrium_idx), thus does "
"not support phase equilibrium.".format(self.name))
self.phase_equilibrium_generation = Var(
self.flowsheet().config.time,
self.config.property_package.phase_equilibrium_idx,
domain=Reals,
initialize=0.0,
doc="Amount of generation in control volume by phase equilibria",
units=flow_units)
# Material transfer term
if has_mass_transfer:
self.mass_transfer_term = Var(
self.flowsheet().config.time,
pc_set,
domain=Reals,
initialize=0.0,
doc="Component material transfer into unit",
units=flow_units)
# Create rules to substitute material balance terms
# Accumulation term
def accumulation_term(b, t, p, j):
return pyunits.convert(b.material_accumulation[t, p, j],
to_units=flow_units) if dynamic else 0
def kinetic_term(b, t, p, j):
return (b.rate_reaction_generation[t, p, j] if has_rate_reactions
else 0)
def equilibrium_term(b, t, p, j):
return (b.equilibrium_reaction_generation[t, p, j]
if has_equilibrium_reactions else 0)
def phase_equilibrium_term(b, t, p, j):
if has_phase_equilibrium and \
balance_type == MaterialBalanceType.componentPhase:
sd = {}
for r in b.config.property_package.phase_equilibrium_idx:
if b.config.property_package.\
phase_equilibrium_list[r][0] == j:
if b.config.property_package.\
phase_equilibrium_list[r][1][0] == p:
sd[r] = 1
elif b.config.property_package.\
phase_equilibrium_list[r][1][1] == p:
sd[r] = -1
else:
sd[r] = 0
else:
sd[r] = 0
return sum(b.phase_equilibrium_generation[t, r] * sd[r]
for r in b.config.property_package.
phase_equilibrium_idx)
else:
return 0
def transfer_term(b, t, p, j):
return (b.mass_transfer_term[t, p, j] if has_mass_transfer else 0)
# TODO: Need to set material_holdup = 0 for non-present component-phase
# pairs. Not ideal, but needed to close DoF. Is there a better way?
# Material Holdup
if has_holdup:
if not hasattr(self, "phase_fraction"):
self._add_phase_fractions()
@self.Constraint(self.flowsheet().config.time,
pc_set,
doc="Material holdup calculations")
def material_holdup_calculation(b, t, p, j):
if (p, j) in pc_set:
return b.material_holdup[t, p, j] == (
b.volume[t]*self.phase_fraction[t, p] *
b.properties_out[t].get_material_density_terms(p, j))
if has_rate_reactions:
# Add extents of reaction and stoichiometric constraints
self.rate_reaction_extent = Var(
self.flowsheet().config.time,
self.config.reaction_package.rate_reaction_idx,
domain=Reals,
initialize=0.0,
doc="Extent of kinetic reactions",
units=flow_units)
@self.Constraint(self.flowsheet().config.time,
pc_set,
doc="Kinetic reaction stoichiometry constraint")
def rate_reaction_stoichiometry_constraint(b, t, p, j):
if (p, j) in pc_set:
rparam = rblock[t].params
return b.rate_reaction_generation[t, p, j] == (
sum(rparam.rate_reaction_stoichiometry[r, p, j] *
b.rate_reaction_extent[t, r]
for r in b.config.reaction_package.
rate_reaction_idx))
else:
return Constraint.Skip
if has_equilibrium_reactions:
# Add extents of reaction and stoichiometric constraints
self.equilibrium_reaction_extent = Var(
self.flowsheet().config.time,
self.config.reaction_package.equilibrium_reaction_idx,
domain=Reals,
initialize=0.0,
doc="Extent of equilibrium reactions",
units=flow_units)
@self.Constraint(self.flowsheet().config.time,
pc_set,
doc="Equilibrium reaction stoichiometry")
def equilibrium_reaction_stoichiometry_constraint(b, t, p, j):
if (p, j) in pc_set:
return b.equilibrium_reaction_generation[t, p, j] == (
sum(rblock[t].params.
equilibrium_reaction_stoichiometry[r, p, j] *
b.equilibrium_reaction_extent[t, r]
for r in b.config.reaction_package.
equilibrium_reaction_idx))
else:
return Constraint.Skip
# Add custom terms and material balances
if balance_type == MaterialBalanceType.componentPhase:
def user_term_mol(b, t, p, j):
if custom_molar_term is not None:
flow_basis = b.properties_out[t].get_material_flow_basis()
if flow_basis == MaterialFlowBasis.molar:
return custom_molar_term(t, p, j)
elif flow_basis == MaterialFlowBasis.mass:
try:
return (custom_molar_term(t, p, j) *
b.properties_out[t].mw_comp[j])
except AttributeError:
raise PropertyNotSupportedError(
"{} property package does not support "
"molecular weight (mw), which is required for "
"using custom terms in material balances."
.format(self.name))
else:
raise ConfigurationError(
"{} contained a custom_molar_term argument, but "
"the property package used an undefined basis "
"(MaterialFlowBasis.other). Custom terms can "
"only be used when the property package declares "
"a molar or mass flow basis.".format(self.name))
else:
return 0
def user_term_mass(b, t, p, j):
if custom_mass_term is not None:
flow_basis = b.properties_out[t].get_material_flow_basis()
if flow_basis == MaterialFlowBasis.mass:
return custom_mass_term(t, p, j)
elif flow_basis == MaterialFlowBasis.molar:
try:
return (custom_mass_term(t, p, j) /
b.properties_out[t].mw_comp[j])
except AttributeError:
raise PropertyNotSupportedError(
"{} property package does not support "
"molecular weight (mw), which is required for "
"using custom terms in material balances."
.format(self.name))
else:
raise ConfigurationError(
"{} contained a custom_mass_term argument, but "
"the property package used an undefined basis "
"(MaterialFlowBasis.other). Custom terms can "
"only be used when the property package declares "
"a molar or mass flow basis.".format(self.name))
else:
return 0
@self.Constraint(self.flowsheet().config.time,
pc_set,
doc="Material balances")
def material_balances(b, t, p, j):
if (p, j) in pc_set:
return accumulation_term(b, t, p, j) == (
b.properties_in[t].get_material_flow_terms(p, j) -
b.properties_out[t].get_material_flow_terms(p, j) +
kinetic_term(b, t, p, j) *
b._rxn_rate_conv(t, j, has_rate_reactions) +
equilibrium_term(b, t, p, j) +
phase_equilibrium_term(b, t, p, j) +
transfer_term(b, t, p, j) +
user_term_mol(b, t, p, j) +
user_term_mass(b, t, p, j))
else:
return Constraint.Skip
elif balance_type == MaterialBalanceType.componentTotal:
def user_term_mol(b, t, j):
if custom_molar_term is not None:
flow_basis = b.properties_out[t].get_material_flow_basis()
if flow_basis == MaterialFlowBasis.molar:
return custom_molar_term(t, j)
elif flow_basis == MaterialFlowBasis.mass:
try:
return (custom_molar_term(t, j) *
b.properties_out[t].mw_comp[j])
except AttributeError:
raise PropertyNotSupportedError(
"{} property package does not support "
"molecular weight (mw), which is required for "
"using custom terms in material balances."
.format(self.name))
else:
raise ConfigurationError(
"{} contained a custom_molar_term argument, but "
"the property package used an undefined basis "
"(MaterialFlowBasis.other). Custom terms can "
"only be used when the property package declares "
"a molar or mass flow basis.".format(self.name))
else:
return 0
def user_term_mass(b, t, j):
if custom_mass_term is not None:
flow_basis = b.properties_out[t].get_material_flow_basis()
if flow_basis == MaterialFlowBasis.mass:
return custom_mass_term(t, j)
elif flow_basis == MaterialFlowBasis.molar:
try:
return (custom_mass_term(t, j) /
b.properties_out[t].mw_comp[j])
except AttributeError:
raise PropertyNotSupportedError(
"{} property package does not support "
"molecular weight (mw), which is required for "
"using custom terms in material balances."
.format(self.name))
else:
raise ConfigurationError(
"{} contained a custom_mass_term argument, but "
"the property package used an undefined basis "
"(MaterialFlowBasis.other). Custom terms can "
"only be used when the property package declares "
"a molar or mass flow basis.".format(self.name))
else:
return 0
@self.Constraint(self.flowsheet().config.time,
component_list,
doc="Material balances")
def material_balances(b, t, j):
cplist = []
for p in phase_list:
if (p, j) in pc_set:
cplist.append(p)
return (
sum(accumulation_term(b, t, p, j) for p in cplist) ==
sum(b.properties_in[t].get_material_flow_terms(p, j)
for p in cplist) -
sum(b.properties_out[t].get_material_flow_terms(p, j)
for p in cplist) +
sum(kinetic_term(b, t, p, j) for p in cplist) *
b._rxn_rate_conv(t, j, has_rate_reactions) +
sum(equilibrium_term(b, t, p, j) for p in cplist) +
sum(transfer_term(b, t, p, j) for p in cplist) +
user_term_mol(b, t, j) + user_term_mass(b, t, j))
else:
raise BurntToast()
return self.material_balances
[docs] def add_phase_component_balances(self,
has_rate_reactions=False,
has_equilibrium_reactions=False,
has_phase_equilibrium=False,
has_mass_transfer=False,
custom_molar_term=None,
custom_mass_term=None):
"""
This method constructs a set of 0D material balances indexed by time,
phase and component.
Args:
has_rate_reactions: whether default generation terms for rate
reactions should be included in material balances
has_equilibrium_reactions: whether generation terms should for
chemical equilibrium reactions should be included in
material balances
has_phase_equilibrium: whether generation terms should for phase
equilibrium behaviour should be included in material
balances
has_mass_transfer: whether generic mass transfer terms should be
included in material balances
custom_molar_term: a Pyomo Expression representing custom terms to
be included in material balances on a molar basis.
Expression must be indexed by time, phase list and
component list
custom_mass_term: a Pyomo Expression representing custom terms to
be included in material balances on a mass basis.
Expression must be indexed by time, phase list and
component list
Returns:
Constraint object representing material balances
"""
self._add_material_balance_common(
balance_type=MaterialBalanceType.componentPhase,
has_rate_reactions=has_rate_reactions,
has_equilibrium_reactions=has_equilibrium_reactions,
has_phase_equilibrium=has_phase_equilibrium,
has_mass_transfer=has_mass_transfer,
custom_molar_term=custom_molar_term,
custom_mass_term=custom_mass_term)
return self.material_balances
[docs] def add_total_component_balances(self,
has_rate_reactions=False,
has_equilibrium_reactions=False,
has_phase_equilibrium=False,
has_mass_transfer=False,
custom_molar_term=None,
custom_mass_term=None):
"""
This method constructs a set of 0D material balances indexed by time
and component.
Args:
has_rate_reactions - whether default generation terms for rate
reactions should be included in material balances
has_equilibrium_reactions - whether generation terms should for
chemical equilibrium reactions should be included in
material balances
has_phase_equilibrium - whether generation terms should for phase
equilibrium behaviour should be included in material
balances
has_mass_transfer - whether generic mass transfer terms should be
included in material balances
custom_molar_term - a Pyomo Expression representing custom terms to
be included in material balances on a molar basis.
Expression must be indexed by time, phase list and
component list
custom_mass_term - a Pyomo Expression representing custom terms to
be included in material balances on a mass basis.
Expression must be indexed by time, phase list and
component list
Returns:
Constraint object representing material balances
"""
self._add_material_balance_common(
balance_type=MaterialBalanceType.componentTotal,
has_rate_reactions=has_rate_reactions,
has_equilibrium_reactions=has_equilibrium_reactions,
has_phase_equilibrium=has_phase_equilibrium,
has_mass_transfer=has_mass_transfer,
custom_molar_term=custom_molar_term,
custom_mass_term=custom_mass_term)
return self.material_balances
[docs] def add_total_element_balances(self,
has_rate_reactions=False,
has_equilibrium_reactions=False,
has_phase_equilibrium=False,
has_mass_transfer=False,
custom_elemental_term=None):
"""
This method constructs a set of 0D element balances indexed by time.
Args:
has_rate_reactions - whether default generation terms for rate
reactions should be included in material balances
has_equilibrium_reactions - whether generation terms should for
chemical equilibrium reactions should be included in
material balances
has_phase_equilibrium - whether generation terms should for phase
equilibrium behaviour should be included in material
balances
has_mass_transfer - whether generic mass transfer terms should be
included in material balances
custom_elemental_term - a Pyomo Expression representing custom
terms to be included in material balances on a molar
elemental basis. Expression must be indexed by time and
element list
Returns:
Constraint object representing material balances
"""
# Get dynamic and holdup flags from config block
dynamic = self.config.dynamic
has_holdup = self.config.has_holdup
component_list = self.properties_in.component_list
phase_list = self.properties_in.phase_list
phase_component_set = self.properties_in.phase_component_set
# Check that property package supports element balances
if not hasattr(self.config.property_package, "element_list"):
raise PropertyNotSupportedError(
"{} property package provided does not contain a list of "
"elements (element_list), and thus does not support "
"elemental material balances. Please choose another type "
"of material balance or a property package which supports "
"elemental balances.")
# Check for valid arguments to write total elemental balance
if has_rate_reactions:
raise ConfigurationError(
"{} add_total_element_balances method provided with "
"argument has_rate_reactions = True. Total element "
"balances do not support rate based reactions, "
"please correct your configuration arguments"
.format(self.name))
if has_equilibrium_reactions:
raise ConfigurationError(
"{} add_total_element_balances method provided with "
"argument has_equilibrium_reactions = True. Total element "
"balances do not support equilibrium based reactions, "
"please correct your configuration arguments"
.format(self.name))
if has_phase_equilibrium:
raise ConfigurationError(
"{} add_total_element_balances method provided with "
"argument has_phase_equilibrium = True. Total element "
"balances do not support equilibrium based reactions, "
"please correct your configuration arguments"
.format(self.name))
# Test for components that must exist prior to calling this method
if has_holdup:
if not hasattr(self, "volume"):
raise ConfigurationError(
"{} control volume must have volume defined to have "
"holdup terms. Please call the "
"add_geometry method before adding balance equations."
.format(self.name))
# Get units from property package
units = self.config.property_package.get_metadata().get_derived_units
# Get units for accumulation term if required
if self.config.dynamic:
f_time_units = self.flowsheet().config.time_units
if (f_time_units is None) ^ (units('time') is None):
raise ConfigurationError(
"{} incompatible time unit specification between "
"flowsheet and property package. Either both must use "
"units, or neither.".format(self.name))
if f_time_units is None:
acc_units = None
else:
acc_units = units('amount')/f_time_units
# Identify linearly dependent elements
# It is possible for there to be linearly dependent element balances
# e.g. if a single species is the only source of two different elements
linearly_dependent = []
# Get a representative time point
rtime = self.flowsheet().config.time.first()
# For each component in the material, search for elements which are
# unique to it
for i in component_list:
unique_elements = []
for e in self.config.property_package.element_list:
if self.properties_out[rtime].params.element_comp[i][e] != 0:
# Assume unique until shown otherwise
unique = True
for j in component_list:
if j == i:
continue
# If element appears in any other component, not unique
if self.properties_out[
rtime].params.element_comp[j][e] != 0:
unique = False
if unique:
unique_elements.append(e)
# If more than 1 unique element, they are linearly dependent
if len(unique_elements) > 1:
# Add all but the first to the list of linearly dependent
linearly_dependent.extend(unique_elements[1:])
# Set indexing set for element balances
if len(linearly_dependent) == 0:
# No linearly depednet equations, so use full element list
e_index = self.config.property_package.element_list
else:
# Otherwise, use only non-dependent elements, and log a message
_log.info_low("{} detected linearly dependent element balance "
"equations. Element balances will NOT be written "
"for the following elements: {}"
.format(self.name, linearly_dependent))
e_index = (self.config.property_package.element_list -
linearly_dependent)
# Add Material Balance terms
if has_holdup:
self.element_holdup = Var(
self.flowsheet().config.time,
self.config.property_package.element_list,
domain=Reals,
initialize=1.0,
doc="Elemental holdup in control volume",
units=units('amount'))
if dynamic:
self.element_accumulation = DerivativeVar(
self.element_holdup,
wrt=self.flowsheet().config.time,
doc="Elemental accumulation in control volume",
units=acc_units)
# Method to convert mass flow basis to mole flow basis
def conv_factor(b, t, j):
flow_basis = b.properties_out[t].get_material_flow_basis()
if flow_basis == MaterialFlowBasis.molar:
return 1
elif flow_basis == MaterialFlowBasis.mass:
return 1/b.properties_out[t].mw_comp[j]
else:
raise BalanceTypeNotSupportedError(
"{} property package MaterialFlowBasis == 'other'. Cannot "
"automatically generate elemental balances."
.format(self.name))
@self.Expression(self.flowsheet().config.time,
phase_list,
self.config.property_package.element_list,
doc="Inlet elemental flow terms")
def elemental_flow_in(b, t, p, e):
return sum(conv_factor(b, t, j) *
b.properties_in[t].get_material_flow_terms(p, j) *
b.properties_out[t].params.element_comp[j][e]
for j in component_list)
@self.Expression(self.flowsheet().config.time,
phase_list,
self.config.property_package.element_list,
doc="Outlet elemental flow terms")
def elemental_flow_out(b, t, p, e):
return sum(conv_factor(b, t, j) *
b.properties_out[t].get_material_flow_terms(p, j) *
b.properties_out[t].params.element_comp[j][e]
for j in component_list)
# Create material balance terms as needed
if has_mass_transfer:
self.elemental_mass_transfer_term = Var(
self.flowsheet().config.time,
e_index,
domain=Reals,
initialize=0.0,
doc="Element material transfer into unit",
units=units('flow_mole'))
# Create rules to substitute material balance terms
# Accumulation term
def accumulation_term(b, t, e):
return pyunits.convert(b.element_accumulation[t, e],
to_units=units('flow_mole'))if dynamic else 0
# Mass transfer term
def transfer_term(b, t, e):
return (b.elemental_mass_transfer_term[t, e]
if has_mass_transfer else 0)
# Custom term
def user_term(t, e):
if custom_elemental_term is not None:
return custom_elemental_term(t, e)
else:
return 0
# Element balances
@self.Constraint(self.flowsheet().config.time,
e_index,
doc="Elemental material balances")
def element_balances(b, t, e):
return accumulation_term(b, t, e) == (
sum(b.elemental_flow_in[t, p, e]
for p in phase_list) -
sum(b.elemental_flow_out[t, p, e]
for p in phase_list) +
transfer_term(b, t, e) +
user_term(t, e))
# Elemental Holdup
if has_holdup:
if not hasattr(self, "phase_fraction"):
self._add_phase_fractions()
@self.Constraint(self.flowsheet().config.time,
self.config.property_package.element_list,
doc="Elemental holdup calculation")
def elemental_holdup_calculation(b, t, e):
return b.element_holdup[t, e] == (
b.volume[t] *
sum(conv_factor(b, t, j)*b.phase_fraction[t, p] *
b.properties_out[t].get_material_density_terms(p, j) *
b.properties_out[t]
.params.element_comp[j][e]
for p, j in phase_component_set))
return self.element_balances
[docs] def add_total_material_balances(self, *args, **kwargs):
raise BalanceTypeNotSupportedError(
"{} OD control volumes do not support "
"add_total_material_balances (yet)."
.format(self.name))
[docs] def add_total_enthalpy_balances(self,
has_heat_of_reaction=False,
has_heat_transfer=False,
has_work_transfer=False,
has_enthalpy_transfer=False,
custom_term=None):
"""
This method constructs a set of 0D enthalpy balances indexed by time
and phase.
Args:
has_heat_of_reaction - whether terms for heat of reaction should
be included in enthalpy balance
has_heat_transfer - whether terms for heat transfer should be
included in enthalpy balances
has_work_transfer - whether terms for work transfer should be
included in enthalpy balances
has_enthalpy_transfer - whether terms for enthalpy transfer due to
mass transfer should be included in enthalpy balance. This
should generally be the same as the has_mas_trasnfer
argument in the material balance methods
custom_term - a Pyomo Expression representing custom terms to
be included in enthalpy balances.
Expression must be indexed by time and phase list
Returns:
Constraint object representing enthalpy balances
"""
# Get dynamic and holdup flags from config block
dynamic = self.config.dynamic
has_holdup = self.config.has_holdup
phase_list = self.properties_in.phase_list
# Test for components that must exist prior to calling this method
if has_holdup:
if not hasattr(self, "volume"):
raise ConfigurationError(
"{} control volume must have volume defined to have "
"holdup terms. Please call the "
"add_geometry method before adding balance equations."
.format(self.name))
if has_heat_of_reaction:
if not (hasattr(self, "rate_reaction_extent") or
hasattr(self, "equilibrium_reaction_extent")):
raise ConfigurationError(
"{} extent of reaction terms must exist in order to "
"have heat of reaction terms. Please ensure that "
"add_material_balance (or equivalent) is called before"
" adding energy balances.".format(self.name))
# Get units from property package
units = self.config.property_package.get_metadata().get_derived_units
# Get units for accumulation term if required
if self.config.dynamic:
f_time_units = self.flowsheet().config.time_units
if (f_time_units is None) ^ (units('time') is None):
raise ConfigurationError(
"{} incompatible time unit specification between "
"flowsheet and property package. Either both must use "
"units, or neither.".format(self.name))
if f_time_units is None:
acc_units = None
else:
acc_units = units('energy')/f_time_units
# Create variables
if has_holdup:
self.energy_holdup = Var(
self.flowsheet().config.time,
phase_list,
domain=Reals,
initialize=1.0,
doc="Energy holdup in control volume",
units=units('energy'))
if dynamic is True:
self.energy_accumulation = DerivativeVar(
self.energy_holdup,
wrt=self.flowsheet().config.time,
doc="Energy accumulation in control volume",
units=acc_units)
# Create energy balance terms as needed
# Heat transfer term
if has_heat_transfer:
self.heat = Var(self.flowsheet().config.time,
domain=Reals,
initialize=0.0,
doc="Heat transfered into control volume",
units=units('power'))
# Work transfer
if has_work_transfer:
self.work = Var(self.flowsheet().config.time,
domain=Reals,
initialize=0.0,
doc="Work transfered into control volume",
units=units('power'))
# Enthalpy transfer
if has_enthalpy_transfer:
self.enthalpy_transfer = Var(
self.flowsheet().config.time,
domain=Reals,
initialize=0.0,
doc="Enthalpy transfered into control volume due to "
"mass transfer",
units=units('power'))
# Heat of Reaction
if has_heat_of_reaction:
@self.Expression(self.flowsheet().config.time,
doc="Heat of reaction term")
def heat_of_reaction(b, t):
if hasattr(self, "rate_reaction_extent"):
rate_heat = -sum(b.rate_reaction_extent[t, r] *
b.reactions[t].dh_rxn[r]
for r in self.config.reaction_package.
rate_reaction_idx)
else:
rate_heat = 0
if hasattr(self, "equilibrium_reaction_extent"):
equil_heat = -sum(
b.equilibrium_reaction_extent[t, e] *
b.reactions[t].dh_rxn[e]
for e in self.config.reaction_package.
equilibrium_reaction_idx)
else:
equil_heat = 0
return rate_heat + equil_heat
# Create rules to substitute energy balance terms
# Accumulation term
def accumulation_term(b, t, p):
return (pyunits.convert(b.energy_accumulation[t, p],
to_units=units('power'))
if dynamic else 0)
def heat_term(b, t):
return b.heat[t] if has_heat_transfer else 0
def work_term(b, t):
return b.work[t] if has_work_transfer else 0
def enthalpy_transfer_term(b, t):
return b.enthalpy_transfer[t] if has_enthalpy_transfer else 0
def rxn_heat_term(b, t):
return b.heat_of_reaction[t] if has_heat_of_reaction else 0
# Custom term
def user_term(t):
if custom_term is not None:
return custom_term(t)
else:
return 0
# Energy balance equation
@self.Constraint(self.flowsheet().config.time, doc="Energy balances")
def enthalpy_balances(b, t):
return sum(accumulation_term(b, t, p) for p in phase_list) == (
sum(b.properties_in[t].get_enthalpy_flow_terms(p) for p in phase_list)
- sum(self.properties_out[t].get_enthalpy_flow_terms(p) for p in phase_list)
+ heat_term(b, t)
+ work_term(b, t)
+ enthalpy_transfer_term(b, t)
+ rxn_heat_term(b, t)
+ user_term(t))
# Energy Holdup
if has_holdup:
if not hasattr(self, "phase_fraction"):
self._add_phase_fractions()
@self.Constraint(self.flowsheet().config.time,
phase_list,
doc="Enthalpy holdup constraint")
def energy_holdup_calculation(b, t, p):
return b.energy_holdup[t, p] == (
b.volume[t]*self.phase_fraction[t, p] *
b.properties_out[t].get_energy_density_terms(p))
return self.enthalpy_balances
[docs] def add_phase_enthalpy_balances(self, *args, **kwargs):
raise BalanceTypeNotSupportedError(
"{} OD control volumes do not support "
"add_phase_enthalpy_balances."
.format(self.name))
[docs] def add_phase_energy_balances(self, *args, **kwargs):
raise BalanceTypeNotSupportedError(
"{} OD control volumes do not support "
"add_phase_energy_balances."
.format(self.name))
[docs] def add_total_energy_balances(self, *args, **kwargs):
raise BalanceTypeNotSupportedError(
"{} OD control volumes do not support "
"add_total_energy_balances."
.format(self.name))
[docs] def add_total_pressure_balances(
self, has_pressure_change=False, custom_term=None):
"""
This method constructs a set of 0D pressure balances indexed by time.
Args:
has_pressure_change - whether terms for pressure change should be
included in enthalpy balances
custom_term - a Pyomo Expression representing custom terms to
be included in pressure balances.
Expression must be indexed by time
Returns:
Constraint object representing pressure balances
"""
# Get units from property package
units = self.config.property_package.get_metadata().get_derived_units
# Add Momentum Balance Variables as necessary
if has_pressure_change:
self.deltaP = Var(self.flowsheet().config.time,
domain=Reals,
initialize=0.0,
doc="Pressure difference across unit",
units=units("pressure"))
# Create rules to substitute energy balance terms
# Pressure change term
def deltaP_term(b, t):
return b.deltaP[t] if has_pressure_change else 0
# Custom term
def user_term(t):
if custom_term is not None:
return custom_term(t)
else:
return 0
# Momentum balance equation
@self.Constraint(self.flowsheet().config.time, doc='Momentum balance')
def pressure_balance(b, t):
return 0 == (
b.properties_in[t].pressure
- b.properties_out[t].pressure
+ deltaP_term(b, t)
+ user_term(t)
)
return self.pressure_balance
[docs] def add_phase_pressure_balances(self, *args, **kwargs):
raise BalanceTypeNotSupportedError(
"{} OD control volumes do not support "
"add_phase_pressure_balances."
.format(self.name))
[docs] def add_phase_momentum_balances(self, *args, **kwargs):
raise BalanceTypeNotSupportedError(
"{} OD control volumes do not support "
"add_phase_momentum_balances."
.format(self.name))
[docs] def add_total_momentum_balances(self, *args, **kwargs):
raise BalanceTypeNotSupportedError(
"{} OD control volumes do not support "
"add_total_momentum_balances."
.format(self.name))
[docs] def model_check(blk):
"""
This method executes the model_check methods on the associated state
blocks (if they exist). This method is generally called by a unit model
as part of the unit's model_check method.
Args:
None
Returns:
None
"""
# Try property block model check
for t in blk.flowsheet().config.time:
try:
blk.properties_in[t].model_check()
except AttributeError:
_log.warning('{} ControlVolume inlet property block has no '
'model checks. To correct this, add a model_check'
' method to the associated StateBlock class.'
.format(blk.name))
try:
blk.properties_out[t].model_check()
except AttributeError:
_log.warning('{} ControlVolume outlet property block has no '
'model checks. To correct this, add a '
'model_check method to the associated '
'StateBlock class.'.format(blk.name))
try:
blk.reactions[t].model_check()
except AttributeError:
_log.warning('{} ControlVolume outlet reaction block has no '
'model check. To correct this, add a '
'model_check method to the associated '
'ReactionBlock class.'.format(blk.name))
[docs] def initialize(blk, state_args=None, outlvl=idaeslog.NOTSET, optarg=None,
solver='ipopt', hold_state=True):
'''
Initialization routine for 0D control volume (default solver ipopt)
Keyword Arguments:
state_args : a dict of arguments to be passed to the property
package(s) to provide an initial state for
initialization (see documentation of the specific
property package) (default = {}).
outlvl : sets output log level of initialization routine
optarg : solver options dictionary object (default=None)
solver : str indicating whcih solver to use during
initialization (default = 'ipopt')
hold_state : flag indicating whether the initialization routine
should unfix any state variables fixed during
initialization, **default** - True. **Valid values:**
**True** - states variables are not unfixed, and a dict of
returned containing flags for which states were fixed
during initialization, **False** - state variables are
unfixed after initialization by calling the release_state
method.
Returns:
If hold_states is True, returns a dict containing flags for which
states were fixed during initialization.
'''
# Get inlet state if not provided
init_log = idaeslog.getInitLogger(blk.name, outlvl, tag="control_volume")
if state_args is None:
state_args = {}
state_dict = (
blk.properties_in[
blk.flowsheet().config.time.first()]
.define_port_members())
for k in state_dict.keys():
if state_dict[k].is_indexed():
state_args[k] = {}
for m in state_dict[k].keys():
state_args[k][m] = state_dict[k][m].value
else:
state_args[k] = state_dict[k].value
# Initialize state blocks
in_flags = blk.properties_in.initialize(
outlvl=outlvl,
optarg=optarg,
solver=solver,
hold_state=hold_state,
state_args=state_args,
)
out_flags = blk.properties_out.initialize(
outlvl=outlvl,
optarg=optarg,
solver=solver,
hold_state=True,
state_args=state_args,
)
try:
# TODO: setting state_vars_fixed may not work for heterogeneous
# systems where a second control volume is involved, as we cannot
# assume those state vars are also fixed. For now, heterogeneous
# reactions should ignore the state_vars_fixed argument and always
# check their state_vars.
blk.reactions.initialize(
outlvl=outlvl,
optarg=optarg,
solver=solver,
state_vars_fixed=True,
)
except AttributeError:
pass
# Unfix outlet properties
blk.properties_out.release_state(
flags=out_flags,
outlvl=outlvl,
)
init_log.info('Initialization Complete')
return in_flags
[docs] def release_state(blk, flags, outlvl=idaeslog.NOTSET):
'''
Method to release state variables fixed during initialization.
Keyword Arguments:
flags : dict containing information of which state variables
were fixed during initialization, and should now be
unfixed. This dict is returned by initialize if
hold_state = True.
outlvl : sets output level of logging
Returns:
None
'''
blk.properties_in.release_state(flags, outlvl=outlvl)
def _add_phase_fractions(self):
"""
This method constructs the phase_fraction variables for the control
volume, and the associated constraint on the sum of phase_fractions
== 1. For systems with only one phase, phase_fraction is created as a
Pyomo Expression with a value of 1.
Args:
None
Returns:
None
"""
phase_list = self.properties_in.phase_list
if len(phase_list) > 1:
self.phase_fraction = Var(
self.flowsheet().config.time,
phase_list,
initialize=1 / len(phase_list),
doc='Volume fraction of holdup by phase')
@self.Constraint(self.flowsheet().config.time,
doc='Sum of phase fractions == 1')
def sum_of_phase_fractions(self, t):
return 1 == sum(self.phase_fraction[t, p]
for p in phase_list)
else:
@self.Expression(self.flowsheet().config.time,
phase_list,
doc='Volume fraction of holdup by phase')
def phase_fraction(self, t, p):
return 1
def _rxn_rate_conv(b, t, j, has_rate_reactions):
"""
Wrapper method for the _rxn_rate_conv method to hide the x argument
required for 1D control volumes.
"""
# Call the method in control_volume_base with x=None
return super()._rxn_rate_conv(t, None, j, has_rate_reactions)
def _get_performance_contents(self, time_point=0):
"""
Collect all CV variables which are present to report.
"""
var_dict = {}
expr_dict = {}
param_dict = {}
phase_component_set = self.properties_in.phase_component_set
phase_list = self.properties_in.phase_list
time_only_vars = {"volume": "Volume",
"heat": "Heat Transfer",
"work": "Work Transfer",
"deltaP": "Pressure Change"}
for v, n in time_only_vars.items():
try:
var_dict[n] = getattr(self, v)[time_point]
except AttributeError:
pass
p_vars = {
"phase_fraction": "Phase Fraction",
"energy_holdup": "Energy Holdup",
"energy_accumulation": "Energy Accumulation"}
for v, n in p_vars.items():
try:
var_obj = getattr(self, v)
for p in phase_list:
var_dict[f"{n} [{p}]"] = var_obj[time_point, p]
except AttributeError:
pass
pc_vars = {
"material_holdup": "Material Holdup",
"material_accumulation": "Material Accumulation",
"rate_reaction_generation": "Rate Reaction Generation",
"equilibrium_reaction_generation":
"Equilibrium Reaction Generation",
"mass_transfer_term": "Mass Transfer Term"}
for v, n in pc_vars.items():
try:
var_obj = getattr(self, v)
for p, j in phase_component_set:
var_dict[f"{n} [{p}, {j}]"] = var_obj[time_point, p, j]
except AttributeError:
pass
if hasattr(self, "rate_reaction_extent"):
for r in self.config.reaction_package.rate_reaction_idx:
var_dict[f"Rate Reaction Extent [{r}]"] = \
self.rate_reaction_extent[time_point, r]
if hasattr(self, "equilibrium_reaction_extent"):
for r in self.config.reaction_package.equilibrium_reaction_idx:
var_dict[f"Equilibrium Reaction Extent [{r}]"] = \
self.equilibrium_reaction_extent[time_point, r]
if hasattr(self, "phase_equilibrium_generation"):
for r in self.config.property_package.phase_equilibrium_idx:
var_dict[f"Phase Equilibrium Generation [{r}]"] = \
self.phase_equilibrium_generation[time_point, r]
e_vars = {
"element_holdup": "Elemental Holdup",
"element_accumulation": "Elemental Accumulation",
"elemental_mass_transfer_term": "Elemental Transfer Term"}
for v, n in e_vars.items():
try:
var_obj = getattr(self, v)
for e in self.config.property_package.element_list:
var_dict[f"{n} [{e}]"] = var_obj[time_point, e]
except AttributeError:
pass
time_only_exprs = {"heat_of_reaction": "Heat of Reaction Term"}
for e, n in time_only_exprs.items():
try:
expr_dict[n] = getattr(self, e)[time_point]
except AttributeError:
pass
e_exprs = {"elemental_flow_in": "Element Flow In",
"elemental_flow_out": "Element Flow Out"}
for o, n in e_exprs.items():
try:
expr_obj = getattr(self, o)
for p in phase_list:
for e in self.config.property_package.element_list:
expr_dict[f"{n} [{p}, {e}]"] = \
expr_obj[time_point, p, e]
except AttributeError:
pass
params = {}
for p, n in params.items():
try:
param_dict[n] = getattr(self, p)
except AttributeError:
pass
return {"vars": var_dict,
"exprs": expr_dict,
"params": param_dict}
def _get_stream_table_contents(self, time_point=0):
"""
Assume unit has standard configuration of 1 inlet and 1 outlet.
Developers should overload this as appropriate.
"""
try:
return create_stream_table_dataframe({"In": self.properties_in,
"Out": self.properties_out},
time_point=time_point)
except AttributeError:
return (f"Unit model {self.name} does not have the standard Port "
f"names (inet and outlet). Please contact the unit model "
f"developer to develop a unit specific stream table.")
def calculate_scaling_factors(self):
super().calculate_scaling_factors()
# If the paraent component of an indexed component has a scale factor, but
# some of the data objects don't, propogate the indexed component scale
# factor to the missing scaling factors.
iscale.propagate_indexed_component_scaling_factors(self)
phase_list = self.properties_in.phase_list
# Default scale factors
heat_sf_default = 1e-6
work_sf_default = 1e-6
volume_sf_default = 1e-3
phase_frac_sf_default = 10
# Function to set defaults so I don't need to reproduce the same code
def _fill_miss_with_default(name, s):
try:
c = getattr(self, name)
except AttributeError:
return # it's okay if the attribute doesn't exist, spell carefully
if iscale.get_scaling_factor(c) is None:
for ci in c.values():
if iscale.get_scaling_factor(ci) is None:
iscale.set_scaling_factor(ci, s)
# Set defaults where scale factors are missing
_fill_miss_with_default("volume", heat_sf_default)
_fill_miss_with_default("heat", heat_sf_default)
_fill_miss_with_default("work", work_sf_default)
_fill_miss_with_default("phase_fraction", phase_frac_sf_default)
if hasattr(self, "energy_holdup"):
for (t, p), v in self.energy_holdup.items():
sf = iscale.get_scaling_factor(
self.volume[t], default=1, warning=True)
sf *= iscale.get_scaling_factor(
self.properties_out[t].get_energy_density_terms(p),
default=1,
warning=True)
iscale.set_scaling_factor(v, sf)
if hasattr(self, "material_holdup"):
for (t, p, i), v in self.material_holdup.items():
sf = iscale.get_scaling_factor(
self.volume[t], default=1, warning=True)
sf *= iscale.get_scaling_factor(
self.properties_out[t].get_material_density_terms(p, i),
default=1,
warning=True)
iscale.set_scaling_factor(v, sf)
if hasattr(self, "material_accumulation"):
for i, v in self.material_accumulation.items():
sf = 100*iscale.get_scaling_factor(
self.material_holdup[i], default=1, warning=True)
iscale.set_scaling_factor(v, sf)
if hasattr(self, "energy_accumulation"):
for i, v in self.energy_accumulation.items():
sf = 100*iscale.get_scaling_factor(
self.energy_holdup[i], default=1, warning=True)
iscale.set_scaling_factor(v, sf)
if hasattr(self, "deltaP"):
for t, v in self.deltaP.items():
if iscale.get_scaling_factor(v) is None:
s = iscale.get_scaling_factor(
self.properties_in[t].pressure,
default=1,
warning=True)
iscale.set_scaling_factor(v, 10*s)
# Material Holdup Constraints
if hasattr(self, "material_holdup_calculation"):
for i, c in self.material_holdup_calculation.items():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(
self.material_holdup[i], default=1, warning=True))
if hasattr(self, "pressure_balance"):
for t, c in self.pressure_balance.items():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(
self.properties_in[t].pressure, default=1, warning=True))
# Material Balance Constraints
if hasattr(self, "material_balances"):
mb_type = self._constructed_material_balance_type
if mb_type == MaterialBalanceType.componentPhase:
for (t, p, j), c in self.material_balances.items():
sf = iscale.get_scaling_factor(
self.properties_in[t].get_material_flow_terms(p, j),
default=1,
warning=True)
iscale.constraint_scaling_transform(c, sf)
elif mb_type == MaterialBalanceType.componentTotal:
for (t , j), c in self.material_balances.items():
sf = iscale.min_scaling_factor(
[self.properties_in[t].get_material_flow_terms(p, j)
for p in phase_list])
iscale.constraint_scaling_transform(c, sf)
else:
# There are some other material balance types but they create
# constraints with different names.
_log.warning(f"Unknow material balance type {mb_type}")
# Energy Balance Constraints
if hasattr(self, "enthalpy_balances"):
for t, c in self.enthalpy_balances.items():
sf = iscale.min_scaling_factor(
[self.properties_in[t].get_enthalpy_flow_terms(p)
for p in phase_list])
iscale.constraint_scaling_transform(c, sf)
if hasattr(self, "energy_holdup_calculation"):
for i, c in self.energy_holdup_calculation.items():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(
self.energy_holdup[i], default=1, warning=True))
if hasattr(self, "meterial_holdup_calculation"):
for i, c in self.material_holdup_calculation.items():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(
self.material_holdup[i], default=1, warning=True))
if hasattr(self, "rate_reaction_stoichiometry_constraint"):
for i, c in self.rate_reaction_stoichiometry_constraint.items():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(
self.rate_reaction_generation[i], default=1, warning=True))
if hasattr(self, "equilibrium_reaction_stoichiometry_constraint"):
for i, c in self.equilibrium_reaction_stoichiometry_constraint.items():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(
self.equilibrium_reaction_generation[i], default=1, warning=True))
if hasattr(self, "element_balances"):
for (t, e), c in self.element_balances.items():
sf = iscale.min_scaling_factor([self.elemental_flow_in[t, p, e]
for p in phase_list])
iscale.constraint_scaling_transform(c, sf)
if hasattr(self, "elemental_holdup_calculation"):
for (t, e), c in self.elemental_holdup_calculation.items():
flow_basis = self.properties_out[t].get_material_flow_basis()
if flow_basis == MaterialFlowBasis.molar:
sf = 10.0 # start with 10 for phase fraction
else:
sf = 10.0/iscale.get_scaling_factor(
self.properties_out[t].mw_comp[j],
default=1,
warning=True)
sf *= iscale.min_scaling_factor(
[self.properties_out[t].get_material_density_terms(p, j)
for p in phase_list])
iscale.constraint_scaling_transform(c, sf)