Node class definition

[Jerell]

• Types
  • source: mass flow in
  • destination: mass flow out
  • internal: mass flow maintained (in = out)
• No size
• Multiple pipelines can meet at a single node
  • The pressure of a node is equal to the lowest pressure of the pipelines connected
• A pressure change must be applied between a pipeline and an end node, if the end node is at a different pressure from the pipeline
• A positive pressure change is pump or compressor; a negative pressure change is restriction
• A node on the edge of the network will either have inward gas flow (mass rate kg/s and temperature), outward gas flow, or zero flow (closed end node)
• Elevation (height above/below sea level) in metres
• Elevation affects pressure
• A node must have at least one connection
• Nodes with only one connection must be a source or destination node