Heat Exchanger

Create Function

create_heat_exchanger(net, from_junction, to_junction, diameter_m, qext_w, loss_coefficient=0, name=None, index=None, in_service=True, type='heat_exchanger', **kwargs)

Creates a heat exchanger element in net[“heat_exchanger”] from heat exchanger parameters.

Parameters

• net (pandapipesNet) – The net for which this heat exchanger should be created

• from_junction (int) – ID of the junction on one side which the heat exchanger will be connected with

• to_junction (int) – ID of the junction on the other side which the heat exchanger will be connected with

• diameter_m (float) – The heat exchanger inner diameter in [m]

• qext_w (float) – External heat flux in [W]. If positive, heat is derived from the network. If negative, heat is being fed into the network from a heat source.

• loss_coefficient (float) – An additional pressure loss coefficient, introduced by e.g. bends

• name (str, default None) – The name of the heat exchanger

• index (int, default None) – Force a specified ID if it is available. If None, the index one higher than the highest already existing index is selected.

• in_service (bool, default True) – True if the heat exchanger is in service or False if it is out of service

• type (str) – Not used yet

• kwargs – Additional keyword arguments will be added as further columns to the net[“heat_exchanger”] table

Returns

index - The unique ID of the created heat exchanger

Return type

int

Example

>>> create_heat_exchanger(net, from_junction=0, to_junction=1,
>>>                       diameter_m=40e-3, qext_w=2000)

Component Table Data

net.heat_exchanger

Parameter	Datatype	Value Range	Explanation
name	string		Name of the heat exchanger
from_junction	integer	\(>\) 0	Index of junction at which the heat exchanger starts
to_junction	integer	\(>\) 0	Index of junction at which the heat exchanger ends
diameter_m	float	\(\gt\) 0	Equivalent inner diameter of the heat exchanger [m]
qext_w	float		The heat flow entering or leaving the heat exchanger [W]
loss_coefficient	float	\(\geq\) 0	An additional loss coefficient which might account for e.g. bends
in_service	boolean	True / False	Specifies if the heat exchanger is in service.
type	string		Type variable to classify heat exchangers

Result Table Data

net.res_heat_exchanger

Parameter	Datatype	Explanation
v_mean_m_per_s	float	The mean velocity of fluid in the heat exchanger [m/s]
p_from_bar	float	Pressure at “from”-junction [bar]
p_to_bar	float	Pressure at “to”-junction [bar]
t_from_k	float	Temperature at “from”-junction [K]
t_to_k	float	Temperature at “to”-junction [K]
mdot_from_kg_per_s	float	Mass flow into heat exchanger [kg/s]
mdot_to_kg_per_s	float	Mass flow out of heat exchanger [kg/s]
vdot_norm_m3_per_s	float	Norm volume flow [m^3/s]
reynolds	float	Average Reynolds number