Due to the rising global energy demand and the increasing urban development, environmentfriendly heating systems, such as district heating, are becoming increasingly important. The construction of district heating infrastructure is difficult due to high maintenance costs and the unfavourable situation on the gas and electricity market. Therefore, it is important to use existing resources better and to improve present structures to reduce the energy providing costs.

Aim of the present master thesis was to define key figures that characterize the operation of area converter stations. Area converter stations are heat transfer points between two different grid levels of the district heating system in Vienna. These prepared figures should help to minimize future losses and to make the best use of existing structures.

The current operating status was ascertained with data from the control system and electric power metering in three area converter stations. The investigations relate to construction, operating modes and the control of the stations. Key figurers derived from the results of the investigations.

To use results on more stations, transferred heat power and the mass flows in different area converter stations were compared. A direct comparison of the key figures from different area converter stations is not possible due to the different conditions of each station.