Advanced Exergy Analysis of Waste-Based District Heating Options through Case Studies

Huseyin Gunhan Ozcan, Arif Hepbasli, Aysegul Abusoglu and Amjad Anvari-Moghaddam
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Huseyin Gunhan Ozcan: Department of Energy Systems Engineering, Yasar University, Bornova, Izmir 35100, Turkey
Arif Hepbasli: Department of Energy Systems Engineering, Yasar University, Bornova, Izmir 35100, Turkey
Aysegul Abusoglu: Department of Mechanical Engineering, Istanbul Technical University, Istanbul 34437, Turkey
Amjad Anvari-Moghaddam: Integrated Energy Systems Laboratory, Department of Energy (AAU Energy), Aalborg University, 9220 Aalborg, Denmark

Energies, 2021, vol. 14, issue 16, 1-21

Abstract: The heating of the buildings, together with domestic hot water generation, is responsible for half of the total generated heating energy, which consumes half of the final energy demand. Meanwhile, district heating systems are a powerful option to meet this demand, with their significant potential and the experience accumulated over many years. The work described here deals with the conventional and advanced exergy performance assessments of the district heating system, using four different waste heat sources by the exhaust gas potentials of the selected plants (municipal solid waste cogeneration, thermal power, wastewater treatment, and cement production), with the real-time data group based on numerical investigations. The simulated results based on conventional exergy analysis revealed that the priority should be given to heat exchanger (HE)-I, with exergy efficiency values from 0.39 to 0.58, followed by HE-II and the pump with those from 0.48 to 0.78 and from 0.81 to 0.82, respectively. On the other hand, the simulated results based on advanced exergy analysis indicated that the exergy destruction was mostly avoidable for the pump (78.32–78.56%) and mostly unavoidable for the heat exchangers (66.61–97.13%). Meanwhile, the exergy destruction was determined to be mainly originated from the component itself (endogenous), for the pump (97.50–99.45%) and heat exchangers (69.80–91.97%). When the real-time implementation was considered, the functional exergy efficiency of the entire system was obtained to be linearly and inversely proportional to the pipeline length and the average ambient temperature, respectively.

Keywords: district heating; waste heat; advanced exergy analysis; cogeneration; cement industry; thermal power plants (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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