Age-related refurbishment and new construction no longer has to be conducted using dome-shaped duct technology...
© SWM Services GmbH

...but can now be carried out more cheaply using a directly buried, pre-insulated bonded pipe system
© SWM Services GmbH
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Initial situation, goals

Several smaller steam networks, for example in Braunschweig, Leipzig und Baden-Baden, have already been converted to hot water in the past, whereby completely new hot water networks were always installed. This procedure, however, would have involved enormously high construction costs for the network in Munich’s inner city. In addition, it was also proved as part of a preceding research project that Munich’s steam network could only remain economically viable if the existing steam and condensate pipes were used and converted to hot water in the foreseeable future. The investment volume is clearly reduced and optimised heat generation capacities from the cogeneration can be utilized at an early stage. Nevertheless, in technical terms such a conversion of a steam network represents uncharted territory. The diverse impacts on all areas of the district heating system – ranging from the generation and the distribution to the customers – mean that its success was in no way guaranteed.

Goals of converting steam-powered district heating networks to hot water:

  • Lower network temperatures
  • Cheaper heat generation
  • More efficient electricity generation through lower turbine output parameters
  • Condensate system can be dispensed with
  • Reduction of heat losses
  • Lower investment in terms of replacement parts (plastic jacket pipes) and new construction
  • Lower operating costs


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