Advanced exergy analysis of waste‐based district heating options through case studies

Huseyin Gunhan Ozcan, Arif Hepbasli, Aysegul Abusoglu*, Amjad Anvari‐moghaddam

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Özet

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 (munici-pal 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 ex-ergy 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, respec-tively.

Orijinal dilİngilizce
Makale numarası4766
DergiEnergies
Hacim14
Basın numarası16
DOI'lar
Yayın durumuYayınlandı - Ağu 2021

Bibliyografik not

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Finansman

Funding: This research is part of the “HeatReFlex‐Green and Flexible District Heating/Cooling” project (Available online: www.heatreflex.et.aau.dk (accessed on: 2 August 2021)) funded by the Danida Fellowship Centre and the Ministry of Foreign Affairs of Denmark to research in growth and transition countries under the grant no. 18‐M06‐AAU. Acknowledgments: The authors acknowledge the support of the “HeatReFlex—Green and Flexible District Heating/Cooling” project (Available online: www.heatreflex.et.aau.dk (accessed on: 2 Au‐ gust 2021)) funded by the Danida Fellowship Centre and the Ministry of Foreign Affairs of Denmark to research in growth and transition countries under the grant no. 18‐M06‐AAU. They are also very grateful to the reviewers and editor for their valuable and constructive comments, which led to increasing the quality of the paper.

FinansörlerFinansör numarası
Flexible District Heating/Cooling
Danida Fellowship Centre
Udenrigsministeriet18‐M06‐AAU

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