Connectivity vlrl

src/pandapipes/component_models/abstract_models/branch_models.py

@@ -5,7 +5,7 @@
 import numpy as np
 
 from pandapipes.component_models.abstract_models.base_component import Component
-from pandapipes.idx_branch import MDOTINIT, branch_cols, TEXT, VLRLCONNECT
+from pandapipes.idx_branch import MDOTINIT, branch_cols, TEXT, FLOW_RETURN_CONNECT
 from pandapipes.pf.pipeflow_setup import get_table_number, get_lookup, get_net_option
 
 try:
@@ -90,7 +90,7 @@ def create_pit_branch_entries(cls, net, branch_pit):
         branch_component_pit[:, :] = np.array([branch_table_nr] + [0] * (branch_cols - 1))
         branch_component_pit[:, MDOTINIT] = 0.1
         branch_component_pit[:, TEXT] = get_net_option(net, 'ambient_temperature')
-        branch_component_pit[:, VLRLCONNECT] = False
+        branch_component_pit[:, FLOW_RETURN_CONNECT] = False
         return branch_component_pit, node_pit, from_nodes, to_nodes
 
     @classmethod

src/pandapipes/component_models/flow_control_component.py

@@ -10,7 +10,8 @@
 from pandapipes.component_models.component_toolbox import \
     standard_branch_wo_internals_result_lookup, get_component_array
 from pandapipes.component_models.junction_component import Junction
-from pandapipes.idx_branch import JAC_DERIV_DP, JAC_DERIV_DP1, JAC_DERIV_DM, MDOTINIT, LOAD_VEC_BRANCHES, VLRLCONNECT
+from pandapipes.idx_branch import (JAC_DERIV_DP, JAC_DERIV_DP1, JAC_DERIV_DM, MDOTINIT, LOAD_VEC_BRANCHES,
+                                   FLOW_RETURN_CONNECT)
 from pandapipes.pf.result_extraction import extract_branch_results_without_internals
 
 
@@ -50,7 +51,7 @@ def create_pit_branch_entries(cls, net, branch_pit):
         """
         fc_branch_pit = super().create_pit_branch_entries(net, branch_pit)
         fc_branch_pit[:, MDOTINIT] = net[cls.table_name()].controlled_mdot_kg_per_s.values
-        fc_branch_pit[net[cls.table_name()].control_active, VLRLCONNECT] = True
+        fc_branch_pit[net[cls.table_name()].control_active, FLOW_RETURN_CONNECT] = True
 
     @classmethod
     def create_component_array(cls, net, component_pits):

src/pandapipes/component_models/heat_consumer_component.py

@@ -10,7 +10,7 @@
 from pandapipes.component_models.junction_component import Junction
 from pandapipes.idx_branch import (MDOTINIT, QEXT, JAC_DERIV_DP1, JAC_DERIV_DM,
                                    JAC_DERIV_DP, LOAD_VEC_BRANCHES, TOUTINIT, JAC_DERIV_DT,
-                                   JAC_DERIV_DTOUT, LOAD_VEC_BRANCHES_T, ACTIVE, VLRLCONNECT)
+                                   JAC_DERIV_DTOUT, LOAD_VEC_BRANCHES_T, ACTIVE, FLOW_RETURN_CONNECT)
 from pandapipes.idx_node import TINIT
 from pandapipes.pf.internals_toolbox import get_from_nodes_corrected
 from pandapipes.pf.pipeflow_setup import get_lookup
@@ -77,7 +77,7 @@ def create_pit_branch_entries(cls, net, branch_pit):
         hc_pit[~np.isnan(mdot), MDOTINIT] = mdot[~np.isnan(mdot)]
         treturn = net[cls.table_name()].treturn_k.values
         hc_pit[~np.isnan(treturn), TOUTINIT] = treturn[~np.isnan(treturn)]
-        hc_pit[:, VLRLCONNECT] = True
+        hc_pit[:, FLOW_RETURN_CONNECT] = True
         mask_q0 = qext == 0 & np.isnan(mdot)
         if np.any(mask_q0):
             hc_pit[mask_q0, ACTIVE] = False

src/pandapipes/idx_branch.py

@@ -30,23 +30,22 @@
 MDOTINIT_T = 19
 FROM_NODE_T_SWITCHED = 20 # flag to indicate if the from and to node are switched in the thermal calculation
 TOUTINIT = 21  # Internal slot for outlet pipe temperature
+FLOW_RETURN_CONNECT = 22 # Make sure that return and flow side are connected to the central pump, respectively
 
-JAC_DERIV_DM = 22  # Slot for the derivative by mass
-JAC_DERIV_DP = 23  # Slot for the derivative by pressure from_node
-JAC_DERIV_DP1 = 24  # Slot for the derivative by pressure to_node
-JAC_DERIV_DM_NODE = 25  # Slot for the derivative by mass for the nodes connected to branch
-LOAD_VEC_BRANCHES = 26  # Slot for the load vector for the branches
-LOAD_VEC_NODES_FROM = 27  # Slot for the load vector of the from nodes connected to branch
-LOAD_VEC_NODES_TO = 28  # Slot for the load vector of the to nodes connected to branch
+JAC_DERIV_DM = 23  # Slot for the derivative by mass
+JAC_DERIV_DP = 24  # Slot for the derivative by pressure from_node
+JAC_DERIV_DP1 = 25  # Slot for the derivative by pressure to_node
+JAC_DERIV_DM_NODE = 26  # Slot for the derivative by mass for the nodes connected to branch
+LOAD_VEC_BRANCHES = 27  # Slot for the load vector for the branches
+LOAD_VEC_NODES_FROM = 28  # Slot for the load vector of the from nodes connected to branch
+LOAD_VEC_NODES_TO = 29  # Slot for the load vector of the to nodes connected to branch
 
-JAC_DERIV_DT = 29
-JAC_DERIV_DTOUT = 30
-JAC_DERIV_DT_NODE = 31  # Slot for the node equation derivative of T for the nodes branch is connected to
-JAC_DERIV_DTOUT_NODE = 32  # Slot for the node equation derivative of T for the corresponding branch
-LOAD_VEC_BRANCHES_T = 33
-LOAD_VEC_NODES_FROM_T = 34 # Slot for the load vector of the from nodes connected to branch
-LOAD_VEC_NODES_TO_T = 35 # Slot for the load vector of the to nodes connected to branch
-
-VLRLCONNECT = 36
+JAC_DERIV_DT = 30
+JAC_DERIV_DTOUT = 31
+JAC_DERIV_DT_NODE = 32  # Slot for the node equation derivative of T for the nodes branch is connected to
+JAC_DERIV_DTOUT_NODE = 33  # Slot for the node equation derivative of T for the corresponding branch
+LOAD_VEC_BRANCHES_T = 34
+LOAD_VEC_NODES_FROM_T = 35 # Slot for the load vector of the from nodes connected to branch
+LOAD_VEC_NODES_TO_T = 36 # Slot for the load vector of the to nodes connected to branch
 
 branch_cols = 37

src/pandapipes/pf/pipeflow_setup.py

@@ -10,7 +10,7 @@
 from scipy.sparse import coo_matrix, csgraph
 
 from pandapipes.idx_branch import FROM_NODE, TO_NODE, branch_cols, MDOTINIT, \
-    ACTIVE as ACTIVE_BR, VLRLCONNECT, ACTIVE, BRANCH_TYPE, CIRC
+    ACTIVE as ACTIVE_BR, FLOW_RETURN_CONNECT, ACTIVE, BRANCH_TYPE, CIRC
 from pandapipes.idx_node import NODE_TYPE, P, NODE_TYPE_T, node_cols, T, ACTIVE as ACTIVE_ND, \
     TABLE_IDX as TABLE_IDX_ND, ELEMENT_IDX as ELEMENT_IDX_ND, INFEED
 from pandapipes.pf.internals_toolbox import _sum_by_group
@@ -619,7 +619,7 @@ def check_connectivity(net, branch_pit, node_pit, mode="hydraulics"):
 
 def perform_connectivity_search(net, node_pit, branch_pit, slack_nodes, active_node_lookup, active_branch_lookup,
                                 mode="hydraulics"):
-    connect = branch_pit[:, VLRLCONNECT].astype(bool)
+    connect = branch_pit[:, FLOW_RETURN_CONNECT].astype(bool)
     circ = branch_pit[:, BRANCH_TYPE] == CIRC
     if np.any(circ) and mode == 'hydraulics':
         active_branch_lookup = active_branch_lookup & ~connect