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AN EXERGY-RATIONAL DISTRICT ENERGY MODEL FOR 100% RENEWABLE CITIES WITH DISTANCE LIMITATIONS

ABSTRACT
While moving towards 100% renewable district energy systems at low temperatures, the exergy of the district energy may decrease below the pumping exergy requirement, which eliminates the benefits of using low-exergy renewables. Because such a possibility may not be revealed by the First Law, an exergy-based holistic model for district energy systems was developed. Four tiers, namely renewable energy resources, energy conversion and storage, main district network, and the low-exergy district are identified. Each tier is indexed to the optimum plant-to-district distance for maximum exergy-based performance with minimum CO2 emissions responsibility. This model further optimizes the temperature peaking with heat pumps versus HVAC equipment oversizing and determines the optimum mix of renewables. Three alternatives of conveying and distributing exergy to the district were considered, namely: electricity only, electricity and heat with or without temperature peaking or equipment oversizing, and electricity, heat, and cold. Comparisons showed that the choice primarily depends upon the district size, district-to-plant distance, climatic conditions, local availability of RES, optimum supply temperature, and thermal condition of the buildings. Another algorithm optimizes the thermal insulation thickness in terms of equipment oversizing and temperature-peaking.
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PAPER SUBMITTED: 2020-04-12
PAPER REVISED: 2020-06-26
PAPER ACCEPTED: 2020-07-07
PUBLISHED ONLINE: 2020-09-26
DOI REFERENCE: https://doi.org/10.2298/TSCI200412287K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE 6, PAGES [3685 - 3705]
REFERENCES
  1. EC, 2030. Climate & Energy Framework; Climate Strategies & Targets; European Commission: Brussels, Belgium; Available online, ec.europa.eu/clima/policies/strategies/2030_en (accessed: 24 June 2020).
  2. Gawer, R. and Cezarz, N. 2016. Stanford University: Economic, Efficient, Green District Low Temperature Hot Water, IDEA Annual Conference, June 2016.
  3. UNEP, 2015. District Energy in Cities, Unlocking the Potential of Energy Efficiency and Renewable Energy, UNEP DTIE Energy Branch, Paris, France wedocs.unep.org/bitstream/handle/20.500.11822/9317/-District_energy_in_cities_unlocking_the_potential_of_energy_efficiency_and_renewable_ene.pdf?sequence=2&isAllowed=y (accessed on 24 June 2020).
  4. Kilkis, B. 2020. Barriers, Solution, and Metrics for 100% Renewable Cities, Special Report to ETIP RHC Meeting, 2 March 2020, Brussels.
  5. www.relatedproject.eu/demonstrations/ (accessed: 24 June 2020).
  6. RHC. 2014. Cross-Cutting Technology Roadmap-European Technology Platform on Renewable Heating and Cooling, EC, Brussels.
  7. EWG. 2019. New Study: Global Energy System based on 100% Renewable Energy, 12 April. energywatchgroup.org/new-study-global-energy-system-based-100-renewable-energy(accessed:24 June 2020).
  8. Kılkış, Ş. 2014. Energy System Analysis of a Pilot Net-Zero Exergy District, Energy Convers Manage, Vol. 87, pp: 1077-1092.
  9. EBC. Annex 64-LowEx Communities,www.iea-ebc.org/projects/project?AnnexID=64 (accessed: 24 June 2020).
  10. EC, 2018. Final Report of the High-Level Panel of the European Decarbonization Pathways Initiative, ISBN 978-92-79-96827-3, Publications office of the EU: Luxembourg.
  11. Gong, M. and Werner, S. 2017. Mapping Energy and Exergy Flows of District Heating in Sweden, Energy Procedia 116, pp:119-127. www.researchgate.net/publication/318201324_Mapping_energy_and_exergy_flows_of_district_heating_in_Sweden (Accessed on 12/05/2019).
  12. Harvey, D. L. D. 2006. A Handbook on Low-Energy Buildings and District-Energy Systems, Fundamentals, Techniques, and Examples, Earthscan, London.
  13. Fischedick, M., Nitsch, J., and Ramesohl, S. 2005. The Role of Hydrogen for the Long-Term Development of Sustainable Energy Systems-a case study of Germany, Solar Energy, 78, 678-686.
  14. Kılkış, B. and Kılkış, Ş. 2018. Hydrogen Economy Model for Nearly Net-Zero Cities with Exergy Rationale and Energy-Water Nexus, Selected Papers from SDEWES 2017, pp: 81-113, MDPI, Basel.
  15. Dincer, I. and Rosen, M. A. 2013. Exergy-Energy, Environment, and Sustainable Development, Elsevier, 2nd. Ed., Boston.
  16. De Rossi, L., Favaro, G., and Rossi, D. 2016. Smart Heat Pump, Using Sea Water for Urban Renewal Project, ASHRAE J. April 2016 Issue, pp: 68-74.
  17. Lund, H. 2014. Renewable Energy Systems: A Smart Energy Systems Approach to the Choice and Modeling of 100% Renewable Solutions. Academic Press, Elsevier, Massachusetts, USA.
  18. Bioenergy Int. 2019. Fortum Värme Changes name to Stockholm Exergi, (accessed: 24 June 2020).bioenergyinternational.com/heat-power/fortum-varme-changes-name-stockholm-exergi
  19. BINE Information Service. 2018. District Heating Network Becomes Heat Hub, Projectinfo 02/2018, Federal Ministry of Economic Affairs and Energy (BMWi) ISSN 0937-8367.
  20. Prando, P., Prada, A., Ochs, F., and Gasparella, A. 2015. Analysis of the Energy and Economic Impact of Cost-Optimal Buildings Refurbishment on District Heating Systems, Science and Technology for the Built Environment, Vol. 21, pp: 876-891, ASHRAE: Atlanta.
  21. Wang, H., Duanmu, L., Li, X., and Lahdelma, R. 2017. Optimizing the District Heating Primary Network from the Perspective of Economic-Specific Pressure Loss, Energies 2017, 10, 1095.
  22. Kavvadias, K. C. and Quoilin, S. 2018. Exploiting Waste Heat Potential by Long Distance Heat Transmission: Design Considerations and Techno-Economic Assessment, Applied E., 216, 452-465.
  23. Ljubenko, A., Poredos, A., Morosuk, T. and Tsatsaronis, G. 2013. Performance Analysis of a District Energy System, Energies, Vol. 6, pp: 1298-1313.
  24. Verda, V., Borchiellini, R. and Cali, M. 2001. A Thermodynamic Approach for the Analysis of District Heating Systems, Int. J. Applied Thermodynamics, Vol. 4, No. 4, pp: 183-190.
  25. Sangi, R. and Müller, D. 2019. Application of the Second Law of Thermodynamics to Control: A Review, Energy, Vol. 174, pp: 938-953.
  26. Kilkis, I. B. 1996. Closed Loop Versus an Open Loop District System: A Techno-Economical Assessment, Geothermal Resources Council, Transactions of Geothermal Development of the Pacific Rim, Vol. 20. pp: 95-102.
  27. Kilkis, I. B. 2002. Rational Use and Management of Geothermal Energy Resources, Int. J. Global Energy Issues, Vol. 17, Nos. 1/2, ISSN: 0954-7118.
  28. Kılkış, B. and Kılkış, Ş. 2018. Rational Exergy Management Model for Effective Utilization of Low-Enthalpy Geothermal Energy Resources, Hittite Journal of Science and Engineering, 2018, 5 (Special Issue: Selected Papers from ULIBTK'17), pp: 59-73. ISSN: 2148-4171,
  29. Kilkis, B. 2020, Exergy-Optimum Coupling of Heat Recovery Ventilation Units with Heat Pump in Sustainable Buildings, JSDEWES (Article in Press). DOI: dx.doi.org/10.13044/j.sdewes.d7.0316
  30. Kilkis, I. B. 2000. Rationalization and Optimization of Heating Systems Coupled to Ground-Source Heat Pumps, ASHRAE T. Vol. 106, Part 2, pp. 817-822.
  31. Kilkis, I. B. 1998. Rationalization of Low-Temperature to Medium-Temperature District Heating, ASHRAE T. Vol. 104, Part 2, pp. 565-576.
  32. Biyikoglu A. and Kilkis, B. 2019. Thermodynamic Limits for Buildings: Energy vs Exergy, ASHRAE Winter Meeting, 12-16 January, Seminar Presentation, ASHRAE: Atlanta.
  33. Kilkis, B. 2011. Exergy Metrication of Radiant Heating and Cooling, ASHRAE T., 117 (1), LV-11-C008.
  34. Kilkis, I. B. 2004. An Exergy Aware Optimization and Control Algorithm for Sustainable Buildings, Int. J. of Green Energy, Vol. 1, No. 1, pp: 65-77.
  35. Kilkis, I. B. 2002. An Analytical Optimization Tool for Hydronic Heating and Cooling with Low-Enthalpy Energy Sources, ASHRAE Transactions, Paper No: HI-02-14-2, pp: 988-996
  36. Kilkis, B. 2020, Exergy-Rational and Carbon-Neutral Readiness for 5G Solar District Heating with Optimum Equipment Oversizing and Tandem Heat Pumps, ISEC 2020 Conference, Graz Austria.
  37. Ford, R. W. Affinity Laws, Why They Work and When They Don't, Technical Feature, ASHRAE J., March 2011, pp: 42-43.
  38. Aijazi, A. N. and Brager, G. S. 2018. Understanding Climate Change Impacts on Building Energy Use, ASHRAE J., October 2018, pp: 24-32.
  39. Stocker, T., Quin D., and Plattner G-K., et al. eds. 2014. Climate Change 2013: The Physical Science Basis, Working Group I, 5th Assessment Report of the IPCC, Cambridge University Press.
  40. Kılkış, B. 2014. Energy Consumption and CO2 Emissions Responsibility of Airport Terminal Buildings: A Case Study for the Future Istanbul Airport, Energy and Buildings, 76: 109-118, 2014.
  41. VoltPro. 2019. High-Efficiency Industrial Motors, Catalog onLine, Izmir, Turkey. voltmotor.com.tr/en/voltpro/ (accessed: 24 June 2020).
  42. Narducci, D., Bermel, P., Lorenzi, B., Wang, N. and Yazawa, K. 2018. Photovoltaic-Thermoelectric-Thermodynamic Co-Generation, Chapter in Book: Hybrid and Fully Thermoelectric Solar Harvesting, Springer Series in Materials Science, doi:10.1007/978-3-319-76427-6-7.
  43. Kilkis, B. 2016. Optimum Operation of Solar PVT Systems: An Exergetic Approach, Solar TR2016 Conference and Exhibition, 6-9 December 2016, Paper No: 0025, Proceedings, pp: 72-79, Istanbul.
  44. ASHRAE. 2016. New System Combines Solar Energy Technologies for Improved Efficiency, ASHRAE J., Vol. 58, No. 9, pp: 6.
  45. Kilkis, I. B. 1999. Utilization of Wind Energy in Space Heating and Cooling with Hybrid HVAC Systems and Heat Pumps, Energy and Buildings, 30 (1999), pp: 147-153.
  46. Kılkış, Ş. and Kılkış, B. 2019. An Urbanization Algorithm for Districts with Minimized Emissions Based on Urban Planning and Embodied Energy Towards Net-Zero Exergy Targets, Energy, 179, 392-406.
  47. Möller, B., Wiechers, E., Persson, U., Grundahl, L., Connolly, D. 2018. Heat Roadmap Europe: Identifying Local Heat Demand and Supply Areas with a European Thermal Atlas, Energy, 158, 281-292.

© 2020 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