Volume

fullflow.Volume

Lumped fluid volume with steady-state mass and energy conservation.

Volume represents an internal fluid control volume whose pressure and specific enthalpy are solved from continuity and energy balance. It is useful for compressible, heated, cooled, or mixed-flow nodes where both pressure and thermodynamic state must be solved.

Parameters

Name	Type	Description
name	str	Component name
network	Network	Network that owns this component
pressure	State	Internal volume pressure
enthalpy	State	Internal volume specific enthalpy
volume	float	Volume of the control volume
total_enthalpy_in	State	Total specific enthalpy entering the volume
total_enthalpy_out	State, optional	Total specific enthalpy leaving the volume. If omitted, enthalpy is used.
heat_rate	State or float, optional	Net heat rate into the volume. Positive values add energy
temperature	State, optional	Fluid temperature in the volume
density	State, optional	Fluid density in the volume
internal_energy	State, optional	Fluid specific internal energy in the volume
mass_flow_in	State, optional	Total mass flow rate entering the volume
mass_flow_out	State, optional	Total mass flow rate leaving the volume

Iteration Variables

Name	Type	Description
pressure	State	Internal volume pressure
enthalpy	State	Internal volume specific enthalpy

Residuals

Name	Type	Description
mass_balance	float	Enforces steady-state mass conservation. mass_flow_in - mass_flow_out = 0
energy_balance	float	Enforces steady-state flow energy conservation. mass_flow_in * total_enthalpy_in - mass_flow_out * total_enthalpy_out + heat_rate = 0 If total_enthalpy_out is not assigned, the volume enthalpy is used as the outlet total enthalpy. If heat_rate is not assigned, it is treated as zero.