More and more low-temperature systems are in operation in district heating. The advantages are obvious, especially when operating a direct system and a STAG (STeam And Gasturbine combined cycle), combined heat- and power plant. This project looked at the effect of combining a number of measures in one system.

The results from the project are available in a report that is based on the system being used at Purmerend in the Netherlands.The fiollowing issues are discussed:

• System modifications
• The main heat source
• The hydraulic circuit
• Heat storage
• Controlling CHP station, storage tanks and auxiliary boilers
• Controlling substations
• Consumer controls
• Heat transport
• Safeguarding
• Adjustment to developments
• Cost analysis of system options