Technical, economic and environmental optimization of district heating expansion in an urban agglomeration

Dominik Franjo Dominković*, Goran Stunjek, Ignacio Blanco, Henrik Madsen, Goran Krajačić

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

161 Downloads (Pure)


In order to integrate large shares of variable renewable energy sources, district heating can play an important role. Furthermore, in order to increase the efficiency of district heating systems, interconnecting adjacent system could be socio-economically justified. In order to assess the economic and environmental consequences of the latter, a mixed linear integer optimization model was developed with the endogenous decision on the potential interconnectors. The case study was carried out for the city of Zagreb, Croatia. The results showed that all three studied interconnections are economically viable, while the socio-economic cost was 29.2% lower in the case of the implemented interconnectors, all other capacities being equal. Moreover, the optimal thermal energy storage capacity was found to be equal to 25 and 24 days of average heating demand in two alternative scenarios. Finally, compared to the reference case, the CO2 emissions could be lowered by 15.3%.CO2 savings derive mainly from better utilization of low carbon capacities after interconnecting the systems, as well as from installation of heat pumps and electric boilers.

Original languageEnglish
Article number117243
Number of pages10
Publication statusPublished - 15 Apr 2020


  • Capacity extension planning
  • District heating expansion
  • Interconnecting district heating systems
  • MILP programming
  • Thermal energy storage
  • Variable renewable energy


Dive into the research topics of 'Technical, economic and environmental optimization of district heating expansion in an urban agglomeration'. Together they form a unique fingerprint.

Cite this