Evaporation Pond (ZO)

Model Type

This unit model is formulated as a single-input, double-output model form. See documentation for single-input, double-output Helper Methods.

Electricity Consumption

Electricity consumption is calculated using the constant_intensity helper function. See documentation for Helper Methods for Electricity Demand.

Costing Method

Costing is calculated using the cost_evaporation_pond method in the zero-order costing package. See documentation for the zero-order costing package.

Additional Variables

Description	Variable Name	Units
Air temperature	air_temperature	K
Daily solar radiation incident	solar_radiation	mJ/m**2
Pond dike height	dike_height	ft
Factor to adjust evaporation rate of pure water	evaporation_rate_adj_factor	None
Evaporation rate calculation parameter A	evap_rate_calc_a_parameter	mm/d
Evaporation rate calculation parameter B	evap_rate_calc_b_parameter	m**2/mJ
Evaporation rate calculation parameter C	evap_rate_calc_c_parameter	m**2/mJ
Adjusted area calculation parameter A	adj_area_calc_a_parameter	acre
Adjusted area calculation parameter B	adj_area_calc_b_parameter	None
Pond area needed based on evaporation rate	area	acre
Adjusted pond area needed	adj_area	acre
Calculated evaporation rate of pure water	evaporation_rate_pure	mm/d
Pure water evaporation rate adjusted for salinity	evaporation_rate_salt	gal/acre/min

Additional Constraints

Description	Constraint Name
Evaporation rate of pure water constraint	evap_rate_pure_constraint
Adjusted evaporation rate for salinity constraint	evap_rate_salt_constraint
Base area constraint	area_constraint
Adjusted area constraint	area_adj_constraint

Class Documentation

This module contains a zero-order representation of an evaporation pond unit model.

class watertap.unit_models.zero_order.evaporation_pond_zo.EvaporationPondZO(*args, **kwds)

Parameters

• rule (function) – A rule function or None. Default rule calls build().

• concrete (bool) – If True, make this a toplevel model. Default - False.

• ctype (class) – Pyomo ctype of the block. Default - pyomo.environ.Block

• default (dict) –

  Default ProcessBlockData config

  Keys

  dynamic

  All zero-order models are steady-state only

  has_holdup

  Zero order models do not include holdup

  property_package

  Property parameter object used to define property calculations, default - useDefault. Valid values: { useDefault - use default package from parent model or flowsheet, PhysicalParameterObject - a PhysicalParameterBlock object.}

  property_package_args

  A ConfigBlock with arguments to be passed to a property block(s) and used when constructing these, default - None. Valid values: {see property package for documentation.}

  database

  An instance of a WaterTAP Database to use for parameters.

  process_subtype

  Process subtype to use when looking up parameters from database.

• initialize (dict) – ProcessBlockData config for individual elements. Keys are BlockData indexes and values are dictionaries described under the “default” argument above.

• idx_map (function) – Function to take the index of a BlockData element and return the index in the initialize dict from which to read arguments. This can be provided to overide the default behavior of matching the BlockData index exactly to the index in initialize.

Returns

(EvaporationPondZO) New instance

class watertap.unit_models.zero_order.evaporation_pond_zo.EvaporationPondZOData(component)

Zero-Order model for a evaporation pond unit.

build()

General build method for UnitModelBlockData. This method calls a number of sub-methods which automate the construction of expected attributes of unit models.

Inheriting models should call super().build.

Parameters

None –

Returns

None