Energy- and exergy-based optimal designs of a low-temperature industrial waste heat recovery system in district heating

Fitó, Jaume; Hodencq, Sacha; Ramousse, Julien; Würtz, Fréderic; Stutz, Benoı̂t; Debray, F.; Benjamin, V.

doi:10.1016/j.enconman.2020.112753

Cited by 50 publications

(18 citation statements)

References 26 publications

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“…Moreover, the waste heat recovery process is straightforward only if a single waste heat source is applied [38]. Fitó et al [39] evaluated valorization of waste heat from the French National Laboratory of Intense Magnetic Fields. The researchers suggested that the demand-oriented design led to recovering waste heat at 35 • C with a heat pump and storage of 40-MWh, increasing the coverage of residential needs by up to 49%.…”

Section: Energy Sourcesmentioning

confidence: 99%

Smart Asset Management for District Heating Systems in the Baltic Sea Region

et al. 2021

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The purpose of this review is to provide insight and a comparison of the current status of district heating (DH) systems for selected Baltic Sea countries (Denmark, Germany, Finland, Latvia, Lithuania, Poland, and Sweden), especially from viewpoints of application and solutions of novel smart asset management (SAM) approaches. Furthermore, this paper considers European projects ongoing from 2016, involving participants from the Baltic Sea Region, concerning various aspects of DH systems. The review presents the energy sources with particular attention to renewable energy sources (RES), district heating generations, and the exploitation problems of DH systems. The essential point is a comparison of traditional maintenance systems versus SAM solutions for optimal design, operating conditions, and controlling of the DH networks. The main conclusions regarding DH systems in Baltic Sea countries are commitment towards a transition to 4th generation DH, raising the quality and efficiency of heat supply systems, and simultaneously minimizing the costs. The overall trends show that applied technologies aim to increase the share of renewable energy sources and reduce greenhouse gas emissions. Furthermore, examples presented in this review underline the importance of the implementation of a smart asset management concept to modern DH systems.

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Section: Energy Sourcesmentioning

confidence: 99%

Smart Asset Management for District Heating Systems in the Baltic Sea Region

et al. 2021

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“…Table A.1 contains the concretized energy balances unit by unit, as well as the auxiliary equations. [12]. The total exergy consumption by the LNCMI's processes is dissociated in 3 main terms: 1) "Useful" exergy destruction by the electromagnets (̇, ) in order to provide experimental data; 2) Recoverable outlet exergy in the form of waste heat (̇, ); 3) Exergy destruction (̇) mainly due to mechanical friction and heat losses.…”

Section: Discussionmentioning

confidence: 99%

“…One of them is exergy. It gives information on how to optimally transform energy [11], and it can either confirm or be in contrast with energy-based analysis [12]. The interest of exergy is claimed by many specialists [11,[13][14][15], not only for engineering but also in energy policy making [16].…”

Section: Introductionmentioning

confidence: 99%

Energy, exergy, economic and exergoeconomic (4E) multicriteria analysis of an industrial waste heat valorization system through district heating

Fitó

Ramousse

Hodencq

et al. 2020

Sustainable Energy Technologies and Assessments

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The purpose of this article is to determine the multicriteria-optimal design of an industrial waste heat recovery system for district heating in Grenoble (France). Energy, exergy and cost flow balances were applied unit by unit allowing to assess the process performance based on two innovative methods. First, the performance assessment includes all units involved in the heat valorization process, not only focusing on the recovery system. Second, the yearly management of energy flows was optimized through mixed-integer linear programming, anticipating fluctuations in residential demands and waste heat availability. This multicriteria analysis with a systemic-anticipative approach allowed to select the appropriate inlet temperature and storage capacity. It was found that the most promising inlet temperature and heat storage capacity are 35 °C and 30 MWh, respectively.With this design, the system recovers 41% of industrial waste heat, covers 48% of residential needs, has an estimated net present value of 11.7 million euros over 20 years, and reduces the district's overall exergy destruction and exergy destruction costs by 20% (4.2 GWh/year) and 9% (286 k€/year), respectively. Remarkably, none of the mono-criterion analyses prioritized this design.Therefore, the multicriteria analysis with systemic-anticipative approach was of utmost importance for detecting the most promising solution.

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“…Based on source-oriented and demand-oriented optimizations with 40-MWh storage capacity, recovering WH at 85 • C without heat pump and at 35 • C with heat pump configurations were recommended, respectively. Fito et al [18] also performed energy-and exergy-based comparative analyses of a WH recovery system for DH in optimal design aspects. The energy analysis was based on the heating demand coverage and WH recovered, as two indicators, while the exergy analysis used only one indicator, which was global annual exergy efficiency.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Energy- and exergy-based optimal designs of a low-temperature industrial waste heat recovery system in district heating

Cited by 50 publications

References 26 publications

Smart Asset Management for District Heating Systems in the Baltic Sea Region

Smart Asset Management for District Heating Systems in the Baltic Sea Region

Energy, exergy, economic and exergoeconomic (4E) multicriteria analysis of an industrial waste heat valorization system through district heating

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

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