def extract_results(cls, net, options, node_name):
"""
Function that extracts certain results.
:param net: The pandapipes network
:type net: pandapipesNet
:param options:
:type options:
:param node_name:
:type node_name:
:return: No Output.
"""
res_table = super().extract_results(net, options, node_name)
loads = net[cls.table_name()]
is_loads = loads.in_service.values
fj, tj = get_lookup(net, "node", "from_to")[node_name]
junct_pit = net["_pit"]["node"][fj:tj, :]
nodes_connected = get_lookup(net, "node", "active")[fj:tj]
is_juncts = np.isin(loads.junction.values, junct_pit[nodes_connected, ELEMENT_IDX])
is_calc = is_loads & is_juncts
res_table["mdot_kg_per_s"].values[is_calc] = loads.mdot_kg_per_s.values[is_calc] \
* loads.scaling.values[is_calc]
def create_pit_node_entries(cls, net, node_pit, node_name):
"""
Function which creates pit node entries.
:param net: The pandapipes network
:type net: pandapipesNet
:param node_pit:
:type node_pit:
:return: No Output.
"""
ft_lookup = get_lookup(net, "node", "from_to")
table_nr = get_table_number(get_lookup(net, "node", "table"),
cls.table_name())
f, t = ft_lookup[cls.table_name()]
junctions = net[cls.table_name()]
junction_pit = node_pit[f:t, :]
junction_pit[:, :] = np.array([table_nr, 0, L] + [0] * (node_cols - 3))
junction_pit[:, ELEMENT_IDX] = junctions.index.values
junction_pit[:, HEIGHT] = junctions.height_m.values
junction_pit[:, PINIT] = junctions.pn_bar.values
junction_pit[:, TINIT] = junctions.tfluid_k.values
junction_pit[:, RHO] = get_fluid(net).get_density(junction_pit[:,
TINIT])
junction_pit[:, PAMB] = p_correction_height_air(junction_pit[:,
HEIGHT])
junction_pit[:, ACTIVE_ND] = junctions.in_service.values
def create_pit_node_entries(cls, net, node_pit, node_name):
"""
Function which creates pit node entries.
:param net: The pandapipes network
:type net: pandapipesNet
:param node_pit:
:type node_pit:
:return: No Output.
"""
table_lookup = get_lookup(net, "node", "table")
table_nr = get_table_number(table_lookup, cls.internal_node_name())
if table_nr is None:
return None, 0, 0, None, None, None
ft_lookup = get_lookup(net, "node", "from_to")
f, t = ft_lookup[cls.internal_node_name()]
int_node_pit = node_pit[f:t, :]
int_node_pit[:, :] = np.array([table_nr, 0, L] + [0] * (node_cols - 3))
int_node_number = cls.get_internal_pipe_number(net) - 1
int_node_pit[:, ELEMENT_IDX] = np.arange(t - f)
f_junction, t_junction = ft_lookup[node_name]
junction_pit = node_pit[f_junction:t_junction, :]
from_junctions = net[cls.table_name()].from_junction.values.astype(
np.int32)
to_junctions = net[cls.table_name()].to_junction.values.astype(
np.int32)
return table_nr, int_node_number, int_node_pit, junction_pit, from_junctions, to_junctions
def extract_results(cls, net, options, node_name):
"""
Function that extracts certain results.
:param net: The pandapipes network
:type net: pandapipesNet
:param options:
:type options:
:return: No Output.
"""
res_table = super().extract_results(net, options, node_name)
f, t = get_lookup(net, "node", "from_to")[cls.table_name()]
fa, ta = get_lookup(net, "node", "from_to_active")[cls.table_name()]
junction_pit = net["_active_pit"]["node"][fa:ta, :]
junctions_active = get_lookup(net, "node", "active")[f:t]
if np.any(junction_pit[:, PINIT] < 0):
warn(
UserWarning(
'Pipeflow converged, however, the results are phyisically incorrect '
'as pressure is at the nodes %s are negative' %
junction_pit[junction_pit[:, PINIT] < 0, ELEMENT_IDX]))
res_table["p_bar"].values[junctions_active] = junction_pit[:, PINIT]
res_table["t_k"].values[junctions_active] = junction_pit[:, TINIT]
def create_pit_branch_entries(cls, net, branch_pit, node_name):
"""
Function which creates pit branch entries.
:param net: The pandapipes network
:type net: pandapipesNet
:param branch_pit:
:type branch_pit:
:param node_name:
:type node_name:
:return: No Output.
"""
f, t = get_lookup(net, "branch", "from_to")[cls.table_name()]
branch_table_nr = get_table_number(get_lookup(net, "branch", "table"),
cls.table_name())
branch_component_pit = branch_pit[f:t, :]
node_pit = net["_pit"]["node"]
junction_idx_lookup = get_lookup(net, "node", "index")[node_name]
from_nodes = junction_idx_lookup[net[cls.table_name()]
["from_junction"].values]
to_nodes = junction_idx_lookup[net[cls.table_name()]
["to_junction"].values]
branch_component_pit[:, :] = np.array([branch_table_nr] + [0] *
(branch_cols - 1))
branch_component_pit[:, VINIT] = 0.1
return branch_component_pit, node_pit, from_nodes, to_nodes
def prepare_result_tables(cls, net, options, node_name):
res_table = super().extract_results(net, options, node_name)
f, t = get_lookup(net, "branch", "from_to")[cls.table_name()]
fa, ta = get_lookup(net, "branch", "from_to_active")[cls.table_name()]
placement_table = np.argsort(net[cls.table_name()].index.values)
idx_pit = net["_pit"]["branch"][f:t, ELEMENT_IDX]
pipe_considered = get_lookup(net, "branch", "active")[f:t]
_, active_pipes = _sum_by_group(idx_pit, pipe_considered.astype(np.int32))
active_pipes = active_pipes > 0.99
placement_table = placement_table[active_pipes]
branch_pit = net["_active_pit"]["branch"][fa:ta, :]
return placement_table, branch_pit, res_table
def create_pit_branch_entries(cls, net, branch_winternals_pit, node_name):
"""
Function which creates pit branch entries.
:param net: The pandapipes network
:type net: pandapipesNet
:param branch_pit:
:type branch_pit:
:return: No Output.
"""
branch_winternals_pit, node_pit, from_nodes, to_nodes\
= super().create_pit_branch_entries(net, branch_winternals_pit, node_name)
internal_pipe_number = cls.get_internal_pipe_number(net)
node_ft_lookups = get_lookup(net, "node", "from_to")
if cls.internal_node_name() in node_ft_lookups:
pipe_nodes_from, pipe_nodes_to = node_ft_lookups[cls.internal_node_name()]
pipe_nodes_idx = np.arange(pipe_nodes_from, pipe_nodes_to)
insert_places = np.repeat(np.arange(len(from_nodes)), internal_pipe_number - 1)
from_nodes = np.insert(from_nodes, insert_places + 1, pipe_nodes_idx)
to_nodes = np.insert(to_nodes, insert_places, pipe_nodes_idx)
branch_winternals_pit[:, ELEMENT_IDX] = np.repeat(net[cls.table_name()].index.values, internal_pipe_number)
branch_winternals_pit[:, FROM_NODE] = from_nodes
branch_winternals_pit[:, TO_NODE] = to_nodes
branch_winternals_pit[:, TINIT] = (node_pit[from_nodes, TINIT_NODE] + node_pit[to_nodes, TINIT_NODE]) / 2
fluid = get_fluid(net)
branch_winternals_pit[:, RHO] = fluid.get_density(branch_winternals_pit[:, TINIT])
branch_winternals_pit[:, ETA] = fluid.get_viscosity(branch_winternals_pit[:, TINIT])
branch_winternals_pit[:, CP] = fluid.get_heat_capacity(branch_winternals_pit[:, TINIT])
branch_winternals_pit[:, ACTIVE] = np.repeat(net[cls.table_name()][cls.active_identifier()].values,
internal_pipe_number)
return branch_winternals_pit, internal_pipe_number
def solve_hydraulics(net):
"""
Create and solve the linearized system of equations (based on a jacobian in form of a scipy
sparse matrix and a load vector in form of a numpy array) in order to calculate the hydraulic
magnitudes (pressure and velocity) for the network nodes and branches.
:param net: The pandapipesNet for which to solve the hydraulic matrix
:type net: pandapipesNet
:return:
"""
options = net["_options"]
branch_pit = net["_active_pit"]["branch"]
node_pit = net["_active_pit"]["node"]
branch_lookups = get_lookup(net, "branch", "from_to_active")
for comp in net['component_list']:
if issubclass(comp, BranchComponent):
comp.calculate_derivatives_hydraulic(net, branch_pit, node_pit, branch_lookups, options)
jacobian, epsilon = build_system_matrix(net, branch_pit, node_pit, False)
v_init_old = branch_pit[:, VINIT].copy()
p_init_old = node_pit[:, PINIT].copy()
x = spsolve(jacobian, epsilon)
branch_pit[:, VINIT] += x[len(node_pit):]
node_pit[:, PINIT] += x[:len(node_pit)] * options["alpha"]
return branch_pit[:, VINIT], node_pit[:, PINIT], v_init_old, p_init_old, epsilon
def create_pit_node_entries(cls, net, node_pit, node_name):
"""
Function which creates pit node entries.
:param net: The pandapipes network
:type net: pandapipesNet
:param node_pit:
:type node_pit:
:return: No Output.
"""
circ_pump, press = super().create_pit_node_entries(
net, node_pit, node_name)
junction_idx_lookups = get_lookup(net, "node", "index")[node_name]
juncts_p, press_sum, number = _sum_by_group(
circ_pump.to_junction.values, press - circ_pump.plift_bar.values,
np.ones_like(press, dtype=np.int32))
index_p = junction_idx_lookups[juncts_p]
node_pit[index_p, PINIT] = press_sum / number
node_pit[index_p, NODE_TYPE] = P
node_pit[index_p, EXT_GRID_OCCURENCE] += number
net["_lookups"]["ext_grid"] = np.array(
list(set(np.concatenate([net["_lookups"]["ext_grid"], index_p]))))
def test_connectivity_hydraulic2(create_test_net):
net = copy.deepcopy(create_test_net)
net.junction.in_service = True
net.pipe.in_service = True
net.valve.opened = True
pandapipes.create_fluid_from_lib(net, "water")
pandapipes.pipeflow(net,
iter=100,
tol_p=1e-7,
tol_v=1e-7,
friction_model="nikuradse")
pandapipes.create_junction(net, 1., 293.15)
pandapipes.create_junction(net, 1., 293.15)
j = pandapipes.create_junction(net, 1., 293.15)
pandapipes.create_junction(net, 1, 293.15)
pandapipes.create_junction(net, 1, 293.15)
pandapipes.create_pipe_from_parameters(net, 0, j, 0.1, 0.1)
pandapipes.create_sink(net, j, 0.1)
pandapipes.pipeflow(net,
iter=100,
tol_p=1e-7,
tol_v=1e-7,
friction_model="nikuradse")
active_branches = get_lookup(net, "branch", "active")
active_nodes = get_lookup(net, "node", "active")
assert np.all(active_nodes == np.array([
True, True, True, True, True, True, True, False, False, True, False,
False, True, True, True
]))
assert np.all(active_branches)
assert not np.all(
np.isnan(net.res_junction.loc[[0, 1, 2, 3, 4, 5, 9], :].values))
assert not np.all(np.isnan(net.res_pipe.values))
assert np.any(np.isnan(net.res_junction.loc[[7, 8, 10, 11], :].values))
def test_connectivity_hydraulic(create_test_net):
"""
:param create_test_net:
:type create_test_net:
:return:
:rtype:
"""
net = copy.deepcopy(create_test_net)
net.junction.in_service = True
net.pipe.in_service = [True, False, False, True, True]
pandapipes.create_fluid_from_lib(net, "water")
pandapipes.pipeflow(net,
iter=100,
tol_p=1e-7,
tol_v=1e-7,
friction_model="nikuradse")
assert np.all(np.isnan(net.res_junction.loc[[2, 5, 6], :].values))
assert np.all(np.isnan(net.res_pipe.loc[[1, 2, 3], :].values))
assert not np.any(np.isnan(net.res_junction.loc[[0, 1, 3, 4], :].values))
assert not np.any(
np.isnan(net.res_pipe.loc[
[0, 4], ["v_mean_m_per_s", "p_from_bar", "p_to_bar"]].values))
assert not np.any(
np.isnan(net.res_sink.loc[[0, 2], "mdot_kg_per_s"].values))
assert np.all(np.isnan(net.res_sink.loc[[1, 3, 4],
"mdot_kg_per_s"].values))
assert np.allclose(net.res_ext_grid.mdot_kg_per_s.sum(),
-net.res_sink.mdot_kg_per_s.sum(),
rtol=1e-10,
atol=0)
active_branches = get_lookup(net, "branch", "active")
active_nodes = get_lookup(net, "node", "active")
assert np.all(active_nodes == np.array(
[True, True, False, True, True, False, False, False, False, True]))
assert np.all(active_branches == np.array(
[True, False, False, False, False, False, True, True, True, False]))
def test_gas_internal_nodes():
"""
:return:
:rtype:
"""
net = pandapipes.create_empty_network("net", add_stdtypes=False)
d = 209.1e-3
pandapipes.create_junction(net, pn_bar=51, tfluid_k=285.15)
pandapipes.create_junction(net, pn_bar=51, tfluid_k=285.15)
pandapipes.create_pipe_from_parameters(net, 0, 1, 12.0, d, k_mm=.5, sections=12)
pandapipes.create_ext_grid(net, 0, p_bar=51 - 1.01325, t_k=285.15, type="pt")
pandapipes.create_sink(net, 1, mdot_kg_per_s=0.82752 * 45000 / 3600)
pandapipes.add_fluid_to_net(net, pandapipes.create_constant_fluid(
name="natural_gas", fluid_type="gas", viscosity=11.93e-6, heat_capacity=2185,
compressibility=1, der_compressibility=0, density=0.82752
))
pandapipes.pipeflow(net, stop_condition="tol", iter=70, friction_model="nikuradse",
transient=False, nonlinear_method="automatic", tol_p=1e-4, tol_v=1e-4)
pipe_results = Pipe.get_internal_results(net, [0])
data = pd.read_csv(os.path.join(internals_data_path, "gas_sections_an.csv"), sep=';', header=0,
keep_default_na=False)
p_an = data["p1"] / 1e5
v_an = data["v"]
v_an = v_an.drop([0])
pipe_p_data_idx = np.where(pipe_results["PINIT"][:, 0] == 0)
pipe_v_data_idx = np.where(pipe_results["VINIT"][:, 0] == 0)
pipe_p_data = pipe_results["PINIT"][pipe_p_data_idx, 1]
pipe_v_data = pipe_results["VINIT"][pipe_v_data_idx, 1]
node_pit = net["_pit"]["node"]
junction_idx_lookup = get_lookup(net, "node", "index")[Junction.table_name()]
from_junction_nodes = junction_idx_lookup[net["pipe"]["from_junction"].values]
to_junction_nodes = junction_idx_lookup[net["pipe"]["to_junction"].values]
p_pandapipes = np.zeros(len(pipe_p_data[0]) + 2)
p_pandapipes[0] = node_pit[from_junction_nodes[0], PINIT]
p_pandapipes[1:-1] = pipe_p_data[:]
p_pandapipes[-1] = node_pit[to_junction_nodes[0], PINIT]
p_pandapipes = p_pandapipes + 1.01325
v_pandapipes = pipe_v_data[0, :]
p_diff = np.abs(1 - p_pandapipes / p_an)
v_diff = np.abs(v_an - v_pandapipes)
assert np.all(p_diff < 0.01)
assert np.all(v_diff < 0.4)
def plot_pipe(cls, net, pipe, pipe_results):
"""
:param net: The pandapipes network
:type net: pandapipesNet
:param pipe:
:type pipe:
:param pipe_results:
:type pipe_results:
:return: No Output.
"""
pipe_p_data_idx = np.where(pipe_results["PINIT"][:, 0] == pipe)
pipe_v_data_idx = np.where(pipe_results["VINIT"][:, 0] == pipe)
pipe_p_data = pipe_results["PINIT"][pipe_p_data_idx, 1]
pipe_t_data = pipe_results["TINIT"][pipe_p_data_idx, 1]
pipe_v_data = pipe_results["VINIT"][pipe_v_data_idx, 1]
node_pit = net["_pit"]["node"]
junction_idx_lookup = get_lookup(net, "node",
"index")[Junction.table_name()]
from_junction_nodes = junction_idx_lookup[net[cls.table_name]
["from_junction"].values]
to_junction_nodes = junction_idx_lookup[net[cls.table_name]
["to_junction"].values]
p_values = np.zeros(len(pipe_p_data[0]) + 2)
p_values[0] = node_pit[from_junction_nodes[pipe], PINIT]
p_values[1:-1] = pipe_p_data[:]
p_values[-1] = node_pit[to_junction_nodes[pipe], PINIT]
t_values = np.zeros(len(pipe_t_data[0]) + 2)
t_values[0] = node_pit[from_junction_nodes[pipe], TINIT_NODE]
t_values[1:-1] = pipe_t_data[:]
t_values[-1] = node_pit[to_junction_nodes[pipe], TINIT_NODE]
v_values = pipe_v_data[0, :]
x_pt = np.linspace(0, net.pipe["length_km"], len(p_values))
x_v = np.linspace(0, net.pipe["length_km"], len(v_values))
f, axes = plt.subplots(3, 1, sharex="all")
axes[0].plot(x_pt, p_values)
axes[0].set_title("Pressure [bar]")
axes[1].plot(x_v, v_values)
axes[1].set_title("Velocity [m/s]")
axes[2].plot(x_pt, t_values)
axes[2].set_title("Temperature [K]")
plt.show()
def extract_results(cls, net, options, node_name):
"""
Function that extracts certain results.
:param net: The pandapipes network
:type net: pandapipesNet
:param options:
:type options:
:param node_name:
:type node_name:
:return: No Output.
"""
ext_grids = net[cls.table_name()]
if len(ext_grids) == 0:
return
res_table = super().extract_results(net, options, node_name)
branch_pit = net['_pit']['branch']
node_pit = net["_pit"]["node"]
p_grids = np.isin(ext_grids.type.values, ["p", "pt"])
junction = cls.get_connected_junction(net)
eg_nodes = get_lookup(net, "node", "index")[node_name][np.array(
junction.values[p_grids])]
node_uni, inverse_nodes, counts = np.unique(eg_nodes,
return_counts=True,
return_inverse=True)
eg_from_branches = np.isin(branch_pit[:, FROM_NODE], node_uni)
eg_to_branches = np.isin(branch_pit[:, TO_NODE], node_uni)
from_nodes = branch_pit[eg_from_branches, FROM_NODE]
to_nodes = branch_pit[eg_to_branches, TO_NODE]
mass_flow_from = branch_pit[eg_from_branches, LOAD_VEC_NODES]
mass_flow_to = branch_pit[eg_to_branches, LOAD_VEC_NODES]
loads = node_pit[node_uni, LOAD]
all_index_nodes = np.concatenate([from_nodes, to_nodes, node_uni])
all_mass_flows = np.concatenate(
[-mass_flow_from, mass_flow_to, -loads])
nodes, sum_mass_flows = _sum_by_group(all_index_nodes, all_mass_flows)
# positive results mean that the ext_grid feeds in, negative means that the ext grid
# extracts (like a load)
res_table["mdot_kg_per_s"].values[p_grids] = \
cls.sign() * (sum_mass_flows / counts)[inverse_nodes]
return res_table, ext_grids, node_uni, node_pit, branch_pit
def create_pit_node_entries(cls, net, node_pit, node_name):
"""
Function which creates pit node entries.
:param net: The pandapipes network
:type net: pandapipesNet
:param node_pit:
:type node_pit:
:return: No Output.
"""
loads = net[cls.table_name()]
helper = loads.in_service.values * loads.scaling.values * cls.sign()
mf = np.nan_to_num(loads.mdot_kg_per_s.values)
mass_flow_loads = mf * helper
juncts, loads_sum = _sum_by_group(loads.junction.values, mass_flow_loads)
junction_idx_lookups = get_lookup(net, "node", "index")[node_name]
index = junction_idx_lookups[juncts]
node_pit[index, LOAD] += loads_sum
def create_pit_node_entries(cls, net, node_pit, node_name):
"""
Function which creates pit node entries.
:param net: The pandapipes network
:type net: pandapipesNet
:param node_pit:
:type node_pit:
:return: No Output.
"""
circ_pump, press = super().create_pit_node_entries(net, node_pit, node_name)
mf = np.nan_to_num(circ_pump.mdot_kg_per_s.values)
mass_flow_loads = mf * circ_pump.in_service.values
juncts, loads_sum = _sum_by_group(circ_pump.to_junction.values, mass_flow_loads)
junction_idx_lookups = get_lookup(net, "node", "index")[node_name]
index = junction_idx_lookups[juncts]
node_pit[index, LOAD] += loads_sum
def solve_temperature(net):
"""
This function contains the procedure to build and solve a linearized system of equation based on
an underlying net and the necessary graph data structures. Temperature values are calculated.
Returned are the solution vectors for the new iteration, the original solution vectors and a
vector containing component indices for the system matrix entries
:param net: The pandapipesNet for which to solve the temperature matrix
:type net: pandapipesNet
:return: branch_pit
"""
options = net["_options"]
branch_pit = net["_active_pit"]["branch"]
node_pit = net["_active_pit"]["node"]
branch_lookups = get_lookup(net, "branch", "from_to_active")
# Negative velocity values are turned to positive ones (including exchange of from_node and
# to_node for temperature calculation
branch_pit[:, VINIT_T] = branch_pit[:, VINIT]
branch_pit[:, FROM_NODE_T] = branch_pit[:, FROM_NODE]
branch_pit[:, TO_NODE_T] = branch_pit[:, TO_NODE]
mask = branch_pit[:, VINIT] < 0
branch_pit[mask, VINIT_T] = -branch_pit[mask, VINIT]
branch_pit[mask, FROM_NODE_T] = branch_pit[mask, TO_NODE]
branch_pit[mask, TO_NODE_T] = branch_pit[mask, FROM_NODE]
for comp in net['component_list']:
if issubclass(comp, BranchComponent):
comp.calculate_derivatives_thermal(net, branch_pit, node_pit,
branch_lookups, options)
jacobian, epsilon = build_system_matrix(net, branch_pit, node_pit, True)
t_init_old = node_pit[:, TINIT].copy()
t_out_old = branch_pit[:, T_OUT].copy()
x = spsolve(jacobian, epsilon)
node_pit[:, TINIT] += x[:len(node_pit)] * options["alpha"]
branch_pit[:, T_OUT] += x[len(node_pit):]
return branch_pit[:,
T_OUT], t_out_old, node_pit[:,
TINIT], t_init_old, epsilon
def test_temperature_internal_nodes_single_pipe():
"""
:return:
:rtype:
"""
net = pandapipes.create_empty_network("net", add_stdtypes=False)
d = 75e-3
pandapipes.create_junction(net, pn_bar=5, tfluid_k=283)
pandapipes.create_junction(net, pn_bar=5, tfluid_k=283)
pandapipes.create_pipe_from_parameters(net, 0, 1, 6, d, k_mm=.1, sections=6, alpha_w_per_m2k=5)
pandapipes.create_ext_grid(net, 0, p_bar=5, t_k=330, type="pt")
pandapipes.create_sink(net, 1, mdot_kg_per_s=1)
pandapipes.create_fluid_from_lib(net, "water", overwrite=True)
pandapipes.pipeflow(net, stop_condition="tol", iter=3, friction_model="nikuradse",
mode="all", transient=False, nonlinear_method="automatic", tol_p=1e-4,
tol_v=1e-4)
pipe_results = Pipe.get_internal_results(net, [0])
data = pd.read_csv(os.path.join(internals_data_path, "Temperature_one_pipe_an.csv"), sep=';',
header=0, keep_default_na=False)
temp_an = data["T"]
pipe_temp_data_idx = np.where(pipe_results["TINIT"][:, 0] == 0)
pipe_temp_data = pipe_results["TINIT"][pipe_temp_data_idx, 1]
node_pit = net["_pit"]["node"]
junction_idx_lookup = get_lookup(net, "node", "index")[Junction.table_name()]
from_junction_nodes = junction_idx_lookup[net["pipe"]["from_junction"].values]
to_junction_nodes = junction_idx_lookup[net["pipe"]["to_junction"].values]
temp_pandapipes = np.zeros(len(pipe_temp_data[0]) + 2)
temp_pandapipes[0] = node_pit[from_junction_nodes[0], TINIT]
temp_pandapipes[1:-1] = pipe_temp_data[:]
temp_pandapipes[-1] = node_pit[to_junction_nodes[0], TINIT]
temp_diff = np.abs(1 - temp_pandapipes / temp_an)
assert np.all(temp_diff < 0.01)
def extract_results(cls, net, options, node_name):
"""
Function that extracts certain results.
:param net: The pandapipes network
:type net: pandapipesNet
:param options:
:type options:
:return: No Output.
"""
res_table, circ_pump, index_nodes_from, node_pit, branch_pit = \
super().extract_results(net, options, node_name)
index_juncts_to = circ_pump.to_junction.values
junct_uni_to = np.array(list(set(index_juncts_to)))
index_nodes_to = get_lookup(net, "node",
"index")[node_name][junct_uni_to]
deltap_bar = node_pit[index_nodes_from,
PINIT] - node_pit[index_nodes_to, PINIT]
res_table["deltap_bar"].values[:] = deltap_bar
def create_pit_node_entries(cls, net, node_pit, node_name):
"""
Function which creates pit node entries.
:param net: The pandapipes network
:type net: pandapipesNet
:param node_pit:
:type node_pit:
:param node_name:
:type node_name:
:return: No Output.
"""
ext_grids = net[cls.table_name()]
p_mask = np.where(np.isin(ext_grids.type.values, ["p", "pt"]))
press = ext_grids.p_bar.values[p_mask] * ext_grids.in_service.values[
p_mask]
junction_idx_lookups = get_lookup(net, "node", "index")[node_name]
junction = cls.get_connected_junction(net)
juncts_p, press_sum, number = _sum_by_group(
junction.values[p_mask], press, np.ones_like(press,
dtype=np.int32))
index_p = junction_idx_lookups[juncts_p]
node_pit[index_p, PINIT] = press_sum / number
node_pit[index_p, NODE_TYPE] = P
node_pit[index_p, EXT_GRID_OCCURENCE] += number
t_mask = np.where(np.isin(ext_grids.type.values, ["t", "pt"]))
t_k = ext_grids.t_k.values[t_mask] * ext_grids.in_service.values[t_mask]
juncts_t, t_sum, number = _sum_by_group(
junction.values[t_mask], t_k, np.ones_like(t_k, dtype=np.int32))
index = junction_idx_lookups[juncts_t]
node_pit[index, TINIT] = t_sum / number
node_pit[index, NODE_TYPE_T] = T
node_pit[index, EXT_GRID_OCCURENCE_T] += number
net["_lookups"]["ext_grid"] = \
np.array(list(set(np.concatenate([net["_lookups"]["ext_grid"], index_p])))) if \
"ext_grid" in net['_lookups'] else index_p
return ext_grids, press
def extract_results(cls, net, options, node_name):
"""
Function that extracts certain results.
:param net: The pandapipes network
:type net: pandapipesNet
:param options:
:type options:
:return: No Output.
"""
placement_table, heat_exchanger_pit, res_table = \
super().extract_results(net, options, node_name)
node_pit = net["_active_pit"]["node"]
node_active_idx_lookup = get_lookup(net, "node", "index_active")[node_name]
junction_idx_lookup = get_lookup(net, "node", "index")[node_name]
from_junction_nodes = node_active_idx_lookup[junction_idx_lookup[
net[cls.table_name()]["from_junction"].values[placement_table]]]
to_junction_nodes = node_active_idx_lookup[junction_idx_lookup[
net[cls.table_name()]["to_junction"].values[placement_table]]]
p_scale = get_net_option(net, "p_scale")
from_nodes = heat_exchanger_pit[:, FROM_NODE].astype(np.int32)
to_nodes = heat_exchanger_pit[:, TO_NODE].astype(np.int32)
fluid = get_fluid(net)
v_mps = heat_exchanger_pit[:, VINIT]
t0 = node_pit[from_nodes, TINIT_NODE]
t1 = node_pit[to_nodes, TINIT_NODE]
mf = heat_exchanger_pit[:, LOAD_VEC_NODES]
vf = heat_exchanger_pit[:, LOAD_VEC_NODES] / get_fluid(net).get_density((t0 + t1) / 2)
idx_active = heat_exchanger_pit[:, ELEMENT_IDX]
idx_sort, v_sum, mf_sum, vf_sum = \
_sum_by_group(idx_active, v_mps, mf, vf)
if fluid.is_gas:
# derived from the ideal gas law
p_from = node_pit[from_nodes, PAMB] + node_pit[from_nodes, PINIT] * p_scale
p_to = node_pit[to_nodes, PAMB] + node_pit[to_nodes, PINIT] * p_scale
numerator = NORMAL_PRESSURE * heat_exchanger_pit[:, TINIT]
normfactor_from = numerator * fluid.get_property("compressibility", p_from) \
/ (p_from * NORMAL_TEMPERATURE)
normfactor_to = numerator * fluid.get_property("compressibility", p_to) \
/ (p_to * NORMAL_TEMPERATURE)
v_gas_from = v_mps * normfactor_from
v_gas_to = v_mps * normfactor_to
mask = p_from != p_to
p_mean = np.empty_like(p_to)
p_mean[~mask] = p_from[~mask]
p_mean[mask] = 2 / 3 * (p_from[mask] ** 3 - p_to[mask] ** 3) \
/ (p_from[mask] ** 2 - p_to[mask] ** 2)
normfactor_mean = numerator * fluid.get_property("compressibility", p_mean) \
/ (p_mean * NORMAL_TEMPERATURE)
v_gas_mean = v_mps * normfactor_mean
idx_sort, v_gas_from_sum, v_gas_to_sum, v_gas_mean_sum, nf_from_sum, nf_to_sum, \
internal_pipes = _sum_by_group(
idx_active, v_gas_from, v_gas_to, v_gas_mean, normfactor_from, normfactor_to,
np.ones_like(idx_active))
res_table["v_from_m_per_s"].values[placement_table] = v_gas_from_sum / internal_pipes
res_table["v_to_m_per_s"].values[placement_table] = v_gas_to_sum / internal_pipes
res_table["v_mean_m_per_s"].values[placement_table] = v_gas_mean_sum / internal_pipes
res_table["normfactor_from"].values[placement_table] = nf_from_sum / internal_pipes
res_table["normfactor_to"].values[placement_table] = nf_to_sum / internal_pipes
else:
res_table["v_mean_m_per_s"].values[placement_table] = v_sum
res_table["p_from_bar"].values[placement_table] = node_pit[from_junction_nodes, PINIT]
res_table["p_to_bar"].values[placement_table] = node_pit[to_junction_nodes, PINIT]
res_table["t_from_k"].values[placement_table] = node_pit[from_junction_nodes, TINIT_NODE]
res_table["t_to_k"].values[placement_table] = node_pit[to_junction_nodes, TINIT_NODE]
res_table["mdot_to_kg_per_s"].values[placement_table] = -mf_sum
res_table["mdot_from_kg_per_s"].values[placement_table] = mf_sum
res_table["vdot_norm_m3_per_s"].values[placement_table] = vf_sum
idx_pit = heat_exchanger_pit[:, ELEMENT_IDX]
idx_sort, lambda_sum, reynolds_sum, = \
_sum_by_group(idx_pit, heat_exchanger_pit[:, LAMBDA], heat_exchanger_pit[:, RE])
res_table["lambda"].values[placement_table] = lambda_sum
res_table["reynolds"].values[placement_table] = reynolds_sum
def extract_results(cls, net, options, node_name):
placement_table, branch_pit, res_table = cls.prepare_result_tables(
net, options, node_name)
node_pit = net["_active_pit"]["node"]
node_active_idx_lookup = get_lookup(net, "node",
"index_active")[node_name]
junction_idx_lookup = get_lookup(net, "node", "index")[node_name]
from_junction_nodes = node_active_idx_lookup[junction_idx_lookup[net[
cls.table_name()]["from_junction"].values[placement_table]]]
to_junction_nodes = node_active_idx_lookup[junction_idx_lookup[net[
cls.table_name()]["to_junction"].values[placement_table]]]
from_nodes = branch_pit[:, FROM_NODE].astype(np.int32)
to_nodes = branch_pit[:, TO_NODE].astype(np.int32)
p_scale = get_net_option(net, "p_scale")
fluid = get_fluid(net)
v_mps = branch_pit[:, VINIT]
t0 = node_pit[from_nodes, TINIT_NODE]
t1 = node_pit[to_nodes, TINIT_NODE]
mf = branch_pit[:, LOAD_VEC_NODES]
vf = branch_pit[:, LOAD_VEC_NODES] / get_fluid(net).get_density(
(t0 + t1) / 2)
idx_active = branch_pit[:, ELEMENT_IDX]
_, v_sum, mf_sum, vf_sum, internal_pipes = \
_sum_by_group(idx_active, v_mps, mf, vf, np.ones_like(idx_active))
if fluid.is_gas:
# derived from the ideal gas law
p_from = node_pit[from_nodes,
PAMB] + node_pit[from_nodes, PINIT] * p_scale
p_to = node_pit[to_nodes,
PAMB] + node_pit[to_nodes, PINIT] * p_scale
numerator = NORMAL_PRESSURE * branch_pit[:, TINIT]
normfactor_from = numerator * fluid.get_property("compressibility", p_from) \
/ (p_from * NORMAL_TEMPERATURE)
normfactor_to = numerator * fluid.get_property("compressibility", p_to) \
/ (p_to * NORMAL_TEMPERATURE)
v_gas_from = v_mps * normfactor_from
v_gas_to = v_mps * normfactor_to
mask = ~np.isclose(p_from, p_to)
p_mean = np.empty_like(p_to)
p_mean[~mask] = p_from[~mask]
p_mean[mask] = 2 / 3 * (p_from[mask] ** 3 - p_to[mask] ** 3) \
/ (p_from[mask] ** 2 - p_to[mask] ** 2)
normfactor_mean = numerator * fluid.get_property("compressibility", p_mean) \
/ (p_mean * NORMAL_TEMPERATURE)
v_gas_mean = v_mps * normfactor_mean
_, _, _, v_gas_mean_sum, nf_from_sum, nf_to_sum, \
internal_pipes = _sum_by_group(idx_active, v_gas_from, v_gas_to, v_gas_mean,
normfactor_from, normfactor_to,
np.ones_like(idx_active))
v_gas_from_ordered = select_from_pit(from_nodes,
from_junction_nodes,
v_gas_from)
v_gas_to_ordered = select_from_pit(to_nodes, to_junction_nodes,
v_gas_to)
res_table["v_from_m_per_s"].values[
placement_table] = v_gas_from_ordered
res_table["v_to_m_per_s"].values[
placement_table] = v_gas_to_ordered
res_table["v_mean_m_per_s"].values[
placement_table] = v_gas_mean_sum / internal_pipes
res_table["normfactor_from"].values[
placement_table] = nf_from_sum / internal_pipes
res_table["normfactor_to"].values[
placement_table] = nf_to_sum / internal_pipes
else:
res_table["v_mean_m_per_s"].values[
placement_table] = v_sum / internal_pipes
res_table["p_from_bar"].values[placement_table] = node_pit[
from_junction_nodes, PINIT]
res_table["p_to_bar"].values[placement_table] = node_pit[
to_junction_nodes, PINIT]
res_table["t_from_k"].values[placement_table] = node_pit[
from_junction_nodes, TINIT_NODE]
res_table["t_to_k"].values[placement_table] = node_pit[
to_junction_nodes, TINIT_NODE]
res_table["mdot_to_kg_per_s"].values[
placement_table] = -mf_sum / internal_pipes
res_table["mdot_from_kg_per_s"].values[
placement_table] = mf_sum / internal_pipes
res_table["vdot_norm_m3_per_s"].values[
placement_table] = vf_sum / internal_pipes
idx_pit = branch_pit[:, ELEMENT_IDX]
_, lambda_sum, reynolds_sum, = \
_sum_by_group(idx_pit, branch_pit[:, LAMBDA], branch_pit[:, RE])
res_table["lambda"].values[
placement_table] = lambda_sum / internal_pipes
res_table["reynolds"].values[
placement_table] = reynolds_sum / internal_pipes
def get_internal_results(cls, net, pipe):
"""
:param net: The pandapipes network
:type net: pandapipesNet
:param pipe:
:type pipe:
:return: pipe_results
:rtype:
"""
internal_sections = cls.get_internal_pipe_number(net)
internal_p_nodes = internal_sections - 1
p_node_idx = np.repeat(pipe, internal_p_nodes[pipe])
v_pipe_idx = np.repeat(pipe, internal_sections[pipe])
pipe_results = dict()
pipe_results["PINIT"] = np.zeros((len(p_node_idx), 2),
dtype=np.float64)
pipe_results["TINIT"] = np.zeros((len(p_node_idx), 2),
dtype=np.float64)
pipe_results["VINIT"] = np.zeros((len(v_pipe_idx), 2),
dtype=np.float64)
if np.all(internal_sections[pipe] >= 2):
fluid = get_fluid(net)
f, t = get_lookup(net, "branch", "from_to")[cls.table_name()]
pipe_pit = net["_pit"]["branch"][f:t, :]
node_pit = net["_pit"]["node"]
int_p_lookup = net["_lookups"]["internal_nodes_lookup"]["TPINIT"]
int_v_lookup = net["_lookups"]["internal_nodes_lookup"]["VINIT"]
selected_indices_p = []
selected_indices_v = []
for i in pipe:
selected_indices_p.append(
np.where(int_p_lookup[:, 0] == i, True, False))
selected_indices_v.append(
np.where(int_v_lookup[:, 0] == i, True, False))
selected_indices_p_final = np.logical_or.reduce(
selected_indices_p[:])
selected_indices_v_final = np.logical_or.reduce(
selected_indices_v[:])
# a = np.where(int_p_lookup[:,0] == True, False)
# b = np.where(int_v_lookup[:, 0] == v_pipe_idx, True, False)
p_nodes = int_p_lookup[:, 1][selected_indices_p_final]
v_nodes = int_v_lookup[:, 1][selected_indices_v_final]
v_pipe_data = pipe_pit[v_nodes, VINIT]
p_node_data = node_pit[p_nodes, PINIT]
t_node_data = node_pit[p_nodes, TINIT_NODE]
gas_mode = fluid.is_gas
if gas_mode:
p_scale = get_net_option(net, "p_scale")
from_nodes = pipe_pit[v_nodes, FROM_NODE].astype(np.int32)
to_nodes = pipe_pit[v_nodes, TO_NODE].astype(np.int32)
p_from = node_pit[from_nodes,
PAMB] + node_pit[from_nodes, PINIT] * p_scale
p_to = node_pit[to_nodes,
PAMB] + node_pit[to_nodes, PINIT] * p_scale
p_mean = np.where(
p_from == p_to, p_from,
2 / 3 * (p_from**3 - p_to**3) / (p_from**2 - p_to**2))
numerator = NORMAL_PRESSURE * node_pit[v_nodes, TINIT_NODE]
normfactor = numerator * fluid.get_property("compressibility", p_mean) \
/ (p_mean * NORMAL_TEMPERATURE)
v_pipe_data = v_pipe_data * normfactor
pipe_results["PINIT"][:, 0] = p_node_idx
pipe_results["PINIT"][:, 1] = p_node_data
pipe_results["TINIT"][:, 0] = p_node_idx
pipe_results["TINIT"][:, 1] = t_node_data
pipe_results["VINIT"][:, 0] = v_pipe_idx
pipe_results["VINIT"][:, 1] = v_pipe_data
else:
logger.warning(
"For at least one pipe no internal data is available.")
return pipe_results