Network Calculations for Gas, District Heating and Water Networks

• For steady-state network calculations, the time dependency of the network state is not considered. Steady-state network calculations are typically used for calculating water networks and low pressure gas networks.

• For quasi-steady network calculations, a sequence of steady-state calculations is performed. Within the calculation period, the switching states and infeed/outflow volumes can be modified. On the basis of these sectional and time-independent hydraulic network states, the transport processes such as quality and temperature tracking as well as water age can be calculated. Quasi-steady network calculations are used especially for calculation of district heating networks as well as of water networks and low pressure gas networks.

• For non-steady network calculations, the actual flow state is modeled in dependence on time. This allows consideration of network fluctionations and pressure surges. Quality tracking is also possible for non-steady network calculation. Non-steady calculations are used for the calculation of high pressure gas networks and pipelines. For non-steady network calculations, we are using the calculation model PSIganesi of our sister business unit PSI gasgrids and pipelines.

PSIcontrol provides the following scope of functions for pipe network calculations:

• State estimator and state observer,
• Cyclical forecast simulation,
• Forecast simulation,
• Steady-state simulation,
• Planning simulation.