import pandapipes as pp #create empty net net = pp.create_empty_network(fluid="lgas") # create junction j1 = pp.create_junction(net, pn_bar=1.05, tfluid_k=293.15, name="Junction 1") j2 = pp.create_junction(net, pn_bar=1.05, tfluid_k=293.15, name="Junction 2") j3 = pp.create_junction(net, pn_bar=1.05, tfluid_k=293.15, name="Junction 3") # create junction elements ext_grid = pp.create_ext_grid(net, junction=j1, p_bar=1.1, t_k=293.15, name="Grid Connection") sink = pp.create_sink(net, junction=j3, mdot_kg_per_s=0.045, name="Sink") # create branch element pipe = pp.create_pipe_from_parameters(net, from_junction=j1, to_junction=j2, length_km=0.1, diameter_m=0.05, name="Pipe 1") valve = pp.create_valve(net, from_junction=j2, to_junction=j3, diameter_m=0.05, opened=True, name="Valve 1")
Note that the fluid used here is lgas. You can find 5 predefined fluids in pandapipes:
- lgas - hgas - hydrogen - water - air
And that the predefined valve element is an ideal valve.
Each dataframe in a pandapipes net object contains the information about one pandapipes element, such as pipe, sink, valve etc.
And check out at the results for junctions and pipes:
They're is no pressure loss between junction 2 and junction 3 because of the ideal valve.
# Problem can not run pipeflow if valve closed net.valve.opened = False
The closed valve cuts the sink from the external grid:
This can be verified by running a power flow and inspecting the results. The pressure and temperature at junction 2 is given as NaN:
Also the results from the pipe show that the mass flow is almost zero and the speed of the mass flow is zero.