Junction

Create Function

For creating a single junction:

For creating multiple junctions at once:

Component Table Data

net.junction

Parameter	Datatype	Value Range	Explanation
name	string		Name of the junction
pn_bar	float	\(>\) 0	Rated pressure of the junction [bar]. Also the initial value for the calculation.
tfluid_k	float	\(\ge\) 0	Fluid temperature at junction [K]
height_m	float	\(\ge\) 0	The height above sea level of the junction [m]
in_service	boolean	True / False	Specifies if the bus is in service.
type	string	p or t or pt	Type variable to classify junctions

net.junction_geodata

Parameter	Datatype	Explanation
x	float	x coordinate of bus location
y	float	y coordinate of bus location

Physical Model

The equations added by a junction correspond to a mass flow balance for hydraulic calculations.

\begin{align*} \sum_{n=0}^N \dot{m}_{in_n} - \sum_{l=0}^M \dot{m}_{out_l} = 0 \end{align*}

For temperature calculations, the thermal power carried by the incoming fluids is balanced:

\begin{align*} \sum_{n=0}^N \dot{m}_{in_n}c_p T_{in_n} - \sum_{l=0}^M \dot{m}_{out_l} c_p T_{m} = 0 \end{align*}

Result Table Data

net.res_junction

Parameter	Datatype	Explanation
p_bar	float	The junction pressure [bar]
t_k	float	The junction temperature [K]