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Performance Analysis of a Hybrid District Heating System: A Case Study of a Small Town in Croatia

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 3, Issue 3, pp 282-302
Robert Mikulandric1,2 , Goran Krajačić2, Neven Duić2, Gennadii Khavin3, Henrik Lund4, Brian Vad Mathiesen4
1 Department of Biosystems, Faculty of Bioscience Engineering, KU Leuven, Kasteelpark Arenberg 20, 3000 Leuven, Belgium
2 Department of Energy, Power Engineering and Ecology, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10002 Zagreb, Croatia
3 The National Technical University “Kharkiv Polytechnic Institute”, Frunze Street 21, Kharkiv, Ukraine
4 Department of Development and Planning, Aalborg University, Fibigerstraede 13, 9220 Aalborg, Denmark

Hybridisation of district heating systems can contribute to more efficient heat generation through cogeneration power plants or through an increase in the share of renewable energy sources in total energy consumption while reducing negative aspects of particular energy source utilisation. In this work, the performance of a hybrid district energy system for a small town in Croatia has been analysed. A mathematical model for process analysis and optimisation algorithm for optimal system configuration have been developed and described. The main goal of the system optimisation is to reduce heat production costs. Several energy sources for heat production have been considered in 8 different simulation cases. Simulation results show that the heat production costs could be reduced with introduction of different energy systems into an existing district heating system. Renewable energy based district heating systems could contribute to heat production costs decrease in district heating systems up to 30% in comparison with highly efficient heat production technologies based on conventional fuels.

Keywords: District heating system hybridisation, Renewable energy systems, District heating system analysis, System optimisation.

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