Energy and exergy analyses of the Danish industry sector

Bühler, Fabian; Nguyen, Tuong-Van; Elmegaard, Brian

doi:10.1016/j.apenergy.2016.02.072

Cited by 73 publications

(24 citation statements)

References 26 publications

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“…Overall, the energy analysis and exergy analysis of UWCAES system guide significantly different directions for optimization. Similar conclusions are also found in other studies . This is because the energy analysis is based on the first law of thermodynamics while the exergy analysis is based on the second law.…”

Section: Energy and Exergy Analysessupporting

confidence: 90%

“…The local loss coefficients are calculated by following equations. [34][35][36][37][38][39][40][41][42][43][44][45][46][47]…”

Section: Pressure Lossmentioning

confidence: 99%

“…Similar conclusions are also found in other studies. [41][42][43] This is because the energy analysis is based on the first law of thermodynamics while the exergy analysis is based on the second law. In energy analysis, only the quantity of energy is considered while both quantity and quality of energy are considered in exergy analysis.…”

Section: Exergy Analysismentioning

confidence: 99%

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Energy, exergy, and sensitivity analyses of underwater compressed air energy storage in an island energy system

et al. 2019

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Summary An underwater compressed air energy storage (UWCAES) system is integrated into an island energy system. Both energy and exergy analyses are conducted to scrutinize the performance of the UWCAES system. The analyses reveal that a round‐trip efficiency of 58.9% can be achieved. However, these two analyses identify different directions for further improvement. The heat exchangers, expanders, compressors, electric motors, and generators account for the most exergy destruction. A sensitivity analysis is also conducted to investigate the importance of different input parameters on the round‐trip exergy efficiency of the UWCAES system. The results of both local and global analyses show that the round‐trip exergy efficiency is most sensitive to the isentropic efficiency of the expanders and compressors, and the efficiencies of the electric motors and generators. The impacts of the heat exchangers, the self‐discharge rate of the air accumulator, the inner diameter of the pneumatic pipelines, and the insulation thickness of the hot‐oil tank on the round‐trip exergy efficiency are shown to be highly nonlinear.

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Section: Energy and Exergy Analysessupporting

confidence: 90%

“…The local loss coefficients are calculated by following equations. [34][35][36][37][38][39][40][41][42][43][44][45][46][47]…”

Section: Pressure Lossmentioning

confidence: 99%

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Energy, exergy, and sensitivity analyses of underwater compressed air energy storage in an island energy system

et al. 2019

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“…Essentially, the changes applied to Table 2 were the following: increasing Mean T p by all sectors; raising the high range Electrical Heating η (%) from 70 to 75 and increasing the three ranges of Fuel Heating efficiencies (%) to 70, 85 and 100 [42]. To compute the energy and exergy efficiencies shown in Table 3, an extensive investigation was developed to find wider criteria and data of industrial end-use heating temperatures from different manufacturing activities [50][51][52][53]. We utilized the data from Table 2 and the quality factors from Table 1.…”

Section: Computation Of the Thermodynamic Efficiencies: Energy (η) Anmentioning

confidence: 99%

An Overview of Energy and Exergy Analysis to the Industrial Sector, a Contribution to Sustainability

et al. 2018

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Globally, industry remains one of the main consumers of fossil fuels; hence, it is one of the prime sources of greenhouse gases (GHG). Exergy analysis methods can be applied to detect the processes inefficiencies. To enhance the interconnection of the exergy and the environment theories, renewable share and exergy efficiency are suggested, in a contribution to sustainability. Exergy analysis is proposed and lifted to study the industrial sector. Even though exergy analysis has been applied to study societies, few studies have been conducted to study emerging-market economies. In 2015, Mexico's crude oil production was the 12th biggest worldwide, therefore fossil fuels are still the main source to produce energy for the domestic and productive sectors of the Mexican society. Consequently, a prospective study case in Mexico is suggested. The industrial sectorial exergy consumption amounts 1350 PJ in 2000, increasing to 1591 PJ in 2015. Both energy and exergy efficiencies show similar results along the 16 years, with average energy and exergy efficiencies of 78% and 23%, respectively. In comparison with results of similar studies, Mexican exergy efficiency falls within the ranges, yet below the average of 48%. Thus, poor efficiency is still occurring in the sector. Our proposal could provide significant opportunities to become a more sustainable sector, based on the exergetic renewable share and the exergy efficiency.

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“…The authors found an exergy conversion performance of 1.3% for households and 38.5% for the tertiary sector. In the past 20 years, several other exergy-based sectoral studies have been developed for countries such as the U.K. (Brockway et al, 2014;Gasparatos et al, 2009;Hammond and Stapleton, 2001), Italy (Wall et al, 1994), Norway (Ertesvåg, 2001), Turkey (Rosen and Dincer, 1997;Utlu and Hepbasli, 2003), China (Chen and Chen, 2006;Brockway et al, 2015), Mexico (García Kerdan, Morillón Gálvez et al, 2015), Jordan (Al-Ghandoor, 2013), U.S. (Reistad, 1980), Denmark (Bühler et al, 2016), and Canada (Rosen, 1992). Rosen (2013) described that exergetic-based sectoral analysis showed that actual efficiencies in the building sector are lower than the perceived inefficiencies commonly published in government annual reports, while in sectors such as the transportation and utility the efficiencies are higher than the perceived efficiencies.…”

Section: Building Stock Modelsmentioning

confidence: 99%

The role of an exergy-based building stock model for exploration of future decarbonisation scenarios and policy making

et al. 2017

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State-of-the-art research suggests that energy systems are best evaluated using exergy analysis, as exergy represents the real value of an energy source, demonstrating it to be the only rational basis for evaluation. After discovering the lack of thermodynamic integration into stock modelling, this paper presents the development of an exergy-based building stock model. The aim of this paper is twofold. Firstly, to investigate the impact of large-scale future energy retrofit scenarios in the English and Welsh (E&W) non-domestic sector, and secondly, to determine the potential of exergy analysis in improving sectoral efficiency and its potential implications on exergy-oriented policy making. The research explores seven different largescale future retrofit scenarios that encompass typical, low-carbon, and low-exergy approaches. Modelling results show that by 2050, current regulations have the potential to reduce carbon emissions by up to 49.0 ±2.9% and increasing sector thermodynamic efficiency from 10.7% to 13.7%. On the other hand, a low-exergy oriented scenario based on renewable electricity and heat pumps is able to reduce carbon emissions by 88.2 ±2.4%, achieving a sectoral exergy efficiency of 19.8%. This modelling framework can provide energy policy makers with new insights on policy options based on exergy indicators and the assessment of their potential impact.

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Energy and exergy analyses of the Danish industry sector

Cited by 73 publications

References 26 publications

Energy, exergy, and sensitivity analyses of underwater compressed air energy storage in an island energy system

Energy, exergy, and sensitivity analyses of underwater compressed air energy storage in an island energy system

An Overview of Energy and Exergy Analysis to the Industrial Sector, a Contribution to Sustainability

The role of an exergy-based building stock model for exploration of future decarbonisation scenarios and policy making

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