Source code for tespy.components.basics.source

# -*- coding: utf-8

"""Module for class Source.


This file is part of project TESPy (github.com/oemof/tespy). It's copyrighted
by the contributors recorded in the version control history of the file,
available from its original location tespy/components/basics/source.py

SPDX-License-Identifier: MIT
"""

import numpy as np

from tespy.components.component import Component




class Source(Component):
    r"""
    A flow originates from a Source.

    Parameters
    ----------
    label : str
        The label of the component.

    design : list
        List containing design parameters (stated as String).

    offdesign : list
        List containing offdesign parameters (stated as String).

    design_path : str
        Path to the components design case.

    local_offdesign : boolean
        Treat this component in offdesign mode in a design calculation.

    local_design : boolean
        Treat this component in design mode in an offdesign calculation.

    char_warnings : boolean
        Ignore warnings on default characteristics usage for this component.

    printout : boolean
        Include this component in the network's results printout.

    Example
    -------
    Create a source and specify a label.

    >>> from tespy.components import Source
    >>> so = Source('a labeled source')
    >>> so.component()
    'source'
    >>> so.label
    'a labeled source'
    """



    @staticmethod
    def component():
        return 'source'




    @staticmethod
    def outlets():
        return ['out1']




    @staticmethod
    def is_branch_source():
        return True




    def start_branch(self):
        outconn = self.outl[0]
        branch = {
            "connections": [outconn],
            "components": [self, outconn.target],
            "subbranches": {}
        }
        outconn.target.propagate_to_target(branch)

        return {outconn.label: branch}




    def start_fluid_wrapper_branch(self):
        outconn = self.outl[0]
        branch = {
            "connections": [outconn],
            "components": [self]
        }
        outconn.target.propagate_wrapper_to_target(branch)

        return {outconn.label: branch}




    @staticmethod
    def get_mandatory_constraints():
        return {}




    def exergy_balance(self, T0):
        r"""Exergy balance calculation method of a source.

        A source does not destroy or produce exergy. The value of
        :math:`\dot{E}_\mathrm{bus}` is set to the exergy of the mass flow to
        make exergy balancing methods more simple as in general a mass flow can
        be fuel, product or loss.

        Parameters
        ----------
        T0 : float
            Ambient temperature T0 / K.

        Note
        ----
        .. math::

            \dot{E}_\mathrm{bus} = \dot{E}_\mathrm{out}^\mathrm{PH}
        """
        self.E_P = np.nan
        self.E_F = np.nan
        self.E_bus = {
            "chemical": self.outl[0].Ex_chemical,
            "physical": self.outl[0].Ex_physical,
            "massless": 0
        }
        self.E_D = np.nan
        self.epsilon = self._calc_epsilon()