The package `Buildings.Fluid.Interface`

consists of
basic classes that can be used by developers to create new
component models.

The classes whose name contains `TwoPort`

or
`FourPort`

can be used for components with two or four
fluid ports, respectively. If a class name contains
`Static`

, then it can only be used for a steady-state
model. Otherwise, it may be used for a steady-state or a dynamic
model.

The most basic classes are the records Buildings.Fluid.Interfaces.TwoPortFlowResistanceParameters, Buildings.Fluid.Interfaces.FourPortFlowResistanceParameters and Buildings.Fluid.Interfaces.LumpedVolumeDeclarations. These define parameters that are needed by many fluid flow components.

Next, we describe the basic classes. For a more detailed
description, see the *info* section of the class.

Buildings.Fluid.Interfaces.ConservationEquation |
This is a basic model for an ideally mixed fluid volume. It
implements conservation equations for mass and energy. The
conservation equations can be dynamic or steady-state. The model
can have an arbitrary number of fluid ports. Models that
instanciate this model need to define the input
`Q_flow` , which is the sensible plus latent heat flow rate added to the medium, and`mXi_flow` , which is the species mass flow rate added to the medium.
Models that instanciate this model can used these connectors to interface with the conservation equations. |

Buildings.Fluid.Interfaces.StaticTwoPortConservationEquation |
This is a basic model for steady-state conservation equations for mass and energy of a component with two fluid ports. The model has the following input connectors:`Q_flow` , which is the sensible plus latent heat flow rate added to the medium, and`mXi_flow` , which is the species mass flow rate added to the medium.
Models that instanciate this model can used these connectors to interface with the conservation equations. Compared to Buildings.Fluid.Interfaces.ConservationEquation this model provides a more efficient implementation of the steady-state conservation equations for models with two fluid ports. |

Buildings.Fluid.Interfaces.PartialFourPort | This model defines an interface for components with four ports. Only parameters and fluid definitions are provided, but no equations. The model is identical to Modelica.Fluid.Interfaces.PartialTwoPort, except that it has four ports. |

Buildings.Fluid.Interfaces.PrescribedOutlet | This model calculates a prescribed heat flow (e.g. for an ideal
heater or cooler), depending on a set temperature
`TSet` . |

Buildings.Fluid.Interfaces.PartialTwoPortInterface | This model defines the interface for component models that
transport fluid, and that can exchange heat and mass. It also
defines the port pressure difference as Δp =
p. However, no equation is
implemented to compute _{a}-p_{b}Δp(⋅) as a function of the mass flow
rate. The model also implements equations to obtain the
thermodynamic state at the ports. |

Buildings.Fluid.Interfaces.PartialFourPortInterface | This model is identical to Buildings.Fluid.Interfaces.PartialTwoPortInterface but it can be used for components with four fluid ports. |

Buildings.Fluid.Interfaces.StaticTwoPortHeatMassExchanger | This model implements the pressure drop as a function of the
mass flow rate. It also implements the steady-state energy and mass
conservation equations. However, it does not implement an equation
that computes `Q_flow` , the sensible and latent heat
transfer to the medium flow, nor does it implement an equation for
`mXi_flow` , the species mass flow rate added to or
removed from the medium. Models that extend this model need to
provide equations for `Q_flow` and
`mXi_flow` . |

Buildings.Fluid.Interfaces.StaticFourPortHeatMassExchanger | This model is identical to Buildings.Fluid.Interfaces.StaticTwoPortHeatMassExchanger except that it has four ports. |

Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger | This model implements the pressure drop as a function of the mass flow rate. It also implements the energy and mass conservation equations, which may be configured as steady-state or dynamic balances based on a parameter. |

Buildings.Fluid.Interfaces.FourPortHeatMassExchanger | This model is identical to Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger except that it has four ports. |

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