Steam distribution systems

Created by: kwakuwulf

As discussed in Vienna I'm adding some issues from the viewpoint of industrial process modelling:

I was wondering how one would define a steam system in the EnergyADE. Two areas of concern:

• ThermalDistributionSystem: most distribution system in industries are based on steam. For that purpose the returnTemperature and supplyTemperature are insufficient information. The pressure of the supply line and the condensate return percentage would be important information. Maybe we could add another inheritance to EnergyDistributionSystem named SteamDistributionSystem that specifically addresses the requirements of steam distribution and does not affect the "normal" distribution systems of buildings.
• Similary a SteamBoiler could be added to EnergyConversionSystems to allow a more specific definition of a steam boiler