Planina Kranj

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Good practice examples; District Heating EPC


Facility:  District heating system for local community (4.300 users) Planina, Kranj

Initial situation:

Out of date district heating built in the period 1972-1988 (heating and hot water)

  • 66 heating stations
  • fuel oil boilers emissions exceed legislative limits
  • inadequate regulation systems and operation management (high return water temperatures and hydraulically unbalanced system – high losses)
  • high heating and hot water costs
  • unsuitable operational conditions for planned CHP gas engines installation (return water temperatures over 70 deg. C)


  • Reduction of heat consumption (lower heat losses due to lower supply and return temperatures) and operating costs
  • Provision of required parameters in the district heating system (water temperatures, pressure) in order to enable operation of CHP gas engine

Measures (selection) - 2010:

Renovation of heating stations 

  • replacement of 14 district heating stations with new compact heating stations with state-of-the-art regulation equipment o replacement of remaining 52 district heating stations inefficient regulation equipment with highly efficient regulation

Refurbishment of sanitary hot water heating stations

  • replacement of regulation for 59 hot water heating stations at the low pressure level 
  • replacement of regulation for 28 hot water heating stations at the high pressure level

Introduction of the remote district heating control and energy management

The energy performance contracting model Planina consists of implementation of the refurbished heating and hot water stations and new district heating and energy management system comprising planning, financing, installing, operation, maintenance and training for 1 year contract term (2011 – 2012).


Guaranteed temperatures decrease – non heating season

  • 17°C - average supply water temperature
  • 12°C - average return water temperature

Guaranteed energy savings – non heating season

  • 18% - lower heat losses
  • 4,6% - lower primary energy consumption

Guaranteed temperatures decrease – heating season

  • 12°C - average supply water temperature
  • 13°C - average return water temperature

Guaranteed energy savings – heating season

  • 19,6% - lower heat losses
  • 1,8% - lower primary energy consumption

Author(s) information


Damir Staničić

Lessons learnt

Lessons Learned, Innovations and Client’s Advantages 1. Implemented measures enabled hydraulically balanced operation, and lower temperatures and heat loses of district heating system: 2011 heating season measurements show 13,9°C lower supply water temperatures and 16,6°C return water temperatures. 2. Used business model enabled to the client in the short period of time (1year) to improve district heating demand side operation needed for further energy, environmental and economic optimisation in terms of future energy supply contracting (CHP gas engines operation).

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reported by Damir Staničić Energy Efficiency Centre Jožef Stefan Institute| Ljubljana | April 2011