First and second level of exergy destruction splitting in advanced exergy analysis for an existing boiler

Vučković, Goran; Stojiljković, Mirko M.; Vukić, Mića

doi:10.1016/j.enconman.2015.06.001

Cited by 22 publications

(11 citation statements)

References 15 publications

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“…An exergy efficiency of = 0.40 was assumed for their combustion process. This value is around typical exergy efficiencies for natural gas-fired boilers [31] or steam boilers [32].…”

Section: Exergy Analysismentioning

confidence: 79%

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

Fitó

Hodencq

Ramousse

et al. 2020

Energy Conversion and Management

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This paper illustrates how the choice of indicators changes the design of a waste heat recovery system in district heating. A prospective system in Grenoble (France) aims to valorize waste heat from the French National Laboratory of Intense Magnetic Fields (LNCMI) by injecting it at 85 °C to the nearby district heating network. We optimize its design for three possible waste heat temperatures: 35 °C (current), 50 °C (viable) and 85 °C (innovative). As major components, the system includes a thermal storage (ranging from 10 MWh to 40 MWh) and may include a heat pump depending on the waste heat's temperature. Different optimizations are guided by two energetic indicators (one source-oriented, the other demand-oriented) and by the overall exergy efficiency. The system's annual performance is assessed through the Sankey and Grassman diagrams and compared between optimal designs. Yearly simulation included optimal management of the thermal storage, through mixedinteger linear programming. The demand-oriented optimal design suggests recovering waste heat at 35 °C with a heat pump and a 40-MWh storage, granting the highest coverage of residential needs (49 %). On the other hand, the source-oriented optimal design suggests recovering waste heat at 85 °C without heat pump and with a 40-MWh storage, reaching the highest recovery of waste heat (55 %). Exergy analysis supports the source-oriented design, as it reaches the highest global exergy efficiency (27 %). Our prospective techno-economic and exergoeconomic analyses should complement these results and may change some conclusions, especially regarding the storage capacity.

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“…An exergy efficiency of = 0.40 was assumed for their combustion process. This value is around typical exergy efficiencies for natural gas-fired boilers [31] or steam boilers [32].…”

Section: Exergy Analysismentioning

confidence: 79%

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

Fitó

Hodencq

Ramousse

et al. 2020

Energy Conversion and Management

View full text Add to dashboard Cite

show abstract

“…Considering the wall roughness has influence on the transition process, the empirical correlation for the transition momentum thickness Reynolds number has been defined as [33] ( (20) where Ks is the average height of sand-grain roughness element, and δ1 is the displacement thickness.…”

Section: Surface Roughness Correlationmentioning

confidence: 99%

“…Voldsund [5] presented the comparison of the oil with gas processing plants and identified the origin of exergy destruction, providing guidance for the improvement of the system. Vučković [20] used the first and second level of exergy destruction splitting for the boiler to analyze an industrial plant and found there is potential exergy destruction that can be avoided. The conclusion is valuable to improve the boiler performance.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation and exergy destruction in condensing steam flow through turbine blade with surface roughness

Ding

Lakzian

et al. 2019

Energy Conversion and Management

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In the steam turbine, the wetness loss due to vapor condensation is one of the most crucial losses at low-pressure stage. This study focused on entropy generation and exergy destruction of condensing steam flow in turbine blade with the roughness. The governing equations including entropy transport equation combined with condensation model, transition SST model and roughness correlation were established and verified by experiments and theory. Flow field behaviors, such as wetness fraction, intermittency and turbulent viscosity distributions, controlled by the deviation angle were obtained to evaluate effects of back pressure ratio and surface roughness. The mass-averaged wetness fraction at outlet was also extracted considering the influence of uneven mass flux. Finally, each part of entropy generation derived from viscous, heat conduction, phase change and aerodynamic losses and exergy destruction ratio were analyzed.Research shows that roughness plays an important part in the intermittency and turbulent viscosity. The mass-averaged wetness fraction at outlet sharply drops with back pressure ratio but slightly decreases with the roughness. With the roughness rising * at stagnation condition mass generation rate, kgm -3 s -1 * 1

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“… 9 The advanced exergy analysis is widely used in evaluating and optimizing individual equipment ( e.g. , fractionator, 10 compressor, 11 internal combustion engine, 12 biomass boiler, 13 industrial boiler, 14 gasifier, 15 and wind turbine 16 ) and processes. 17 − 47 Exergy analysis is widely applied to evaluate the thermodynamic performance of the power generation processes in the beginning 17 − 38 and then expanded to the other fields such as petroleum-based or coal-based chemical processes.…”

Section: Introductionmentioning

confidence: 99%

Advanced Exergy Analysis for a Novel Gasoline Absorption–Stabilization Process

et al. 2021

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The advanced exergy analysis can identify the improved potential of each component and the interaction among components of the refining processes. In this work, a new gasoline absorption–stabilization process (GASP) is proposed for better energy utilization considering the absorption process intensification, which can be further explained using exergy analysis. Both conventional and new GASPs are simulated in PRO/II, which are verified with the actual plant operation data. The energy performance of both conventional and new GASPs is evaluated through the advanced exergy analysis. The exergy efficiencies of conventional and new GASPs are 65.04 and 71.44%, respectively. In addition, the total exergy destruction rates are 7.79 and 6.01 MW, respectively. The total exergy destructions of 46.37 and 40.73% can be reduced, respectively. Though the stabilizer has the largest exergy destruction in both the processes, the air cooler for the rich gas in the new GASP has the largest potential for reducing exergy destruction, which is different from the conventional GASP. Furthermore, a sensitivity analysis of the new GASP is performed to study the effects of newly added operation and design parameters on the conventional and advanced exergy analyses of the absorber.

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First and second level of exergy destruction splitting in advanced exergy analysis for an existing boiler

Cited by 22 publications

References 15 publications

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

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

Entropy generation and exergy destruction in condensing steam flow through turbine blade with surface roughness

Advanced Exergy Analysis for a Novel Gasoline Absorption–Stabilization Process

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