International Scientific Journal


Implementation of co-generation of thermal and electrical energy in district heating systems often results with higher overall energy efficiency of the systems, primary energy savings and environmental benefits. Financial results depend on number of parameters, some of which are very difficult to predict. After introduction of feed-in tariffs for generation of electrical energy in Serbia, better conditions for implementation of co-generation are created, although in district heating systems barriers are still present. In this paper, possibilities and effects of implementation of natural gas fired cogeneration engines are examined and presented for the boiler house that is a part of the district heating system owned and operated by the Faculty of Mechanical Engineering in Niš. At the moment, in this boiler house only thermal energy is produced. The boilers are natural gas fired and often operate in low part load regimes. The plant is working only during the heating season. For estimation of effects of implementation of co-generation, referent values are taken from literature or are based on the results of measurements performed on site. Results are presented in the form of primary energy savings and greenhouse gasses emission reduction potentials. Financial aspects are also considered and triangle of costs is shown.
PAPER REVISED: 2010-07-20
PAPER ACCEPTED: 2010-08-30
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THERMAL SCIENCE YEAR 2010, VOLUME 14, ISSUE Supplement 1, PAGES [S41 - S51]
  1. EDUCOGEN-The European Educational Tool on Cogeneration, The European Association for the Promotion of Co-generation, 2001
  2. 2008 HVAC Systems and Equipment Handbook (SI Edition), ASHRAE, Atlanta, GE, USA, 2008
  3. Nurokivi, A., Institutional Handbook for Combined Heat and Power Production with District Heating, Helsinki University of Technology, Helsinki, Finland, 2004
  4. Clean Energy Project Analysis, RETScreen Engineering & Cases Textbook, Minister of Natural Resources Canada 2001-2005
  5. Guide to Cost Benefit Analysis of Investment Projects (Structural Fund-ERDF, Cohesion Fund and ISPA), Prepared for Evaluation Unit DG Regional Policy, European Commission, 2002
  6. Projected Costs of Generating Electricity, 2005 Update, Nuclear Energy Agency, International Energy Agency, Organization for Economic Co-operation and development, OECD/IEA, Paris, 2005
  7. Bejan, A., Tsatsaronis, G., Moran, M.: Thermal Design and Optimization, John Wiley & Sons Inc., New York, 1996
  8. Abusoglu, A., Kanoglu, M., First and Second Law Analysis of Diesel Engine Powered Cogeneration Systems, Energy Conversion and Management, 49 (2008), 8, pp. 2026-2031
  9. Kanoglu, M., Dincer, I., Performance assessment of cogeneration plants, Energy Conversion and Management, 50 (2009), 1, pp. 76-81
  10. Cao, J., Evaluation of Retrofitting Gas-Fired Cooling and Heating System into BCHP Using Design Optimization, Energy Policy, 37 (2009), 6, pp. 2368-2374
  11. Directive 2004/8/EC of the European Parliament and of the Council of 11 February 2004 on the Promotion of Cogeneration Based on a Useful Heat Demand in the Internal Energy Market and Amending Directive 92/42/EEC, Official Journal of the European Union, L 52 (2004), pp 50-60
  12. Commission Decision of 21 December 2006, Establishing Harmonised Efficiency Reference Values for Separate Production of Electricity and Heat in Application of Directive 2004/8/EC of the European Parliament and of the Council, Official Journal of the European Union, L 32 (2007), pp 183-188
  13. Chicco, G., Mancarella, P., Trigeneration Primary Energy Saving Evaluation for Energy Planning and Policy Development, Energy Policy, 35 (2007), 12, pp. 6132-6144
  14. Chicco, G., Mancarella, P., Assessment of the Greenhouse Gas Emissions from Cogeneration and Trigeneration Systems, Part I: Models and indicators, Energy, 33 (2008), 3, pp. 410-417
  15. Minciuc E. et al., Fuel Savings and CO2 Emissions for Trigeneration Systems, Applied Thermal Engineering, 23 (2003), 11, pp. 1333-1346
  16. Stojiljković, M.M., Stojiljković, M.M., Blagojević, B.D., Primary Energy Savings Potential in Optimized Small Scale Cogeneration Plants, Proceedings, International Symposium Power Plants 2008, Vrnjačka Banja, Serbia, October 28-31, 2008
  17. Mancarella, P., Chicco, G., Global and Local Emission Impact Assessment of Distributed Cogeneration Systems with Partial-Load Models, Applied Energy, 86 (2009), 10, pp. 2096-2106
  18. Canova, A. et al., Emission Characterization and Evaluation of Natural Gas-Fueled Cogeneration Microturbines and Internal Combustion Engines, Energy Conversion and Management, 49 (2008), 10, pp. 2900-2909
  19. IPCC 2006, 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Prepared by the National Greenhouse Gas Inventories Programme, Eggleston H.S., Buendia L., Miwa K., Ngara T. and Tanabe K. (eds). Published: IGES, Japan

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence