Using Exergy to Understand and Improve the Efficiency of Electrical Power Technologies

Rosen, Marc A.; Bulucea, Cornelia Aida

doi:10.3390/e11040820

Cited by 87 publications

(55 citation statements)

References 17 publications

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“…Nationally represents 27.0% of the total energy input for the sector. As the electromagnetic radiation has similar energy and exergy contents, the energy and exergy efficiencies of lighting are almost similar (Rosen and Bulucea, 2009). …”

Section: Electrical Equipment (Lighting Lifts and Pumps And Internamentioning

confidence: 99%

Modelling the energy and exergy utilisation of the Mexican non-domestic sector: A study by climatic regions

et al. 2015

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This paper presents the development of a bottom-up stock model to perform a holistic energy study of the Mexican non-domestic sector. The current energy and exergy flows are shown based on a categorisation by climatic regions with the aim of understanding the impact of local characteristics on regional efficiencies. Due to the limited data currently available, the study is supported by the development of a detailed archetype-based stock model using EnergyPlus as a first law analysis tool combined with an existing exergy analysis method. Twenty-one reference models were created to estimate the electric and gas use in the sector. The results indicate that sectoral energy and exergy annual input are 95.37 PJ and 94.28 PJ respectively. Regional exergy efficiencies were found to be 17.8%, 16.6% and 23.2% for the hot-dry, hot-humid and temperate climates respectively. The study concludes that significant potential for improvements still exists, especially in the cases of space conditioning, lighting, refrigeration, and cooking where most exergy destructions occur. Additionally, this work highlights that the method described may be further used to study the impact of large-scale refurbishments and promote national regulations and standards for sustainable buildings that takes into consideration energy and exergy indicators.

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Section: Electrical Equipment (Lighting Lifts and Pumps And Internamentioning

confidence: 99%

Modelling the energy and exergy utilisation of the Mexican non-domestic sector: A study by climatic regions

et al. 2015

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“…It is consumed or destroyed due to unavoidable irreversibilities in any real process. The exergy consumption during a process is proportional to the entropy created due to irreversibilities associated with the process (Rosen and Bulucea, 2009). …”

Section: Exergy Analysis Of Biomass Fuelsmentioning

confidence: 99%

“…Exergy analysis is a methodology that uses the conservation of energy principle (embodied in the first law of thermodynamics) together with non-conservation of entropy principle (embodied in the second law) for the analysis, design and improvement of energy and systems (Rosen and Bulucea, 2009;Dincer, 2002). The exergy method is useful for improving the efficiency of energy-resource use, for it quantifies the locations, types and magnitudes of wastes and losses.…”

Section: Exergy Analysis Of Biomass Fuelsmentioning

confidence: 99%

“…The exergy method is useful for improving the efficiency of energy-resource use, for it quantifies the locations, types and magnitudes of wastes and losses. In general, more meaningful efficiencies can be evaluated with exergy analysis rather than energy analysis, since exergy efficiencies are always a measure of the approach to the ideal condition (Rosen and Bulucea, 2009).…”

Section: Exergy Analysis Of Biomass Fuelsmentioning

confidence: 99%

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Comprehensive Investigation Into the Exergy Values of Six Rice Husks

Zhang

Ghaly²,

Li³

2013

American Journal of Engineering and Applied Sciences

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Exergy is a measurement of how far a certain system or material deviates from a state of equilibrium with the environment and it is a useful tool for improving the efficiency of energy-resource use. Based on the previous work, the exergy values of six rice husks were investigated in this study. The effects of physical and chemical properties were also detailed. These included moisture content, ash content, S, C, O, H and N contents. The moisture related exergy of the six rice husks ranged in 241.432-290.304 kJ per kg rice husk, accounting for 1.563-1.758% of the exergy of rice husks. An exponential relationship between exergy value and moisture content was observed. The exergy of ash varied between 37.419 kJ per kg rice husk and 61.217 kJ per kg rice husk, making up 0.233-0.401% of the exergy of rice husks. An exponential linear relationship between exergy value and ash content was observed. The S related exergy ranged from 1.217 kJ per kg rice husk to 2.993 kJ per kg rice husk, accounting for 0.007-0.018% of the exergy of rice husks. The O/C, H/C and N/C atomic ratios varied in ranges of 0.592-0.662, 1.404-1.730 and 0.008-0.011, respectively, whereas the correlation factors varied slightly in the range of 1.118-1.127. The exergy values of the six rice husks ranged in 15.053-18.407 MJ/kg. They were mainly determined by the correlation factors and the LHVs. A positive linear relationship between exergy value and LHV was observed.

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“…Exergy analysis helps in finding the losses taking place in a system. By this method, energy conversion at different points, various component efficiencies and points of largest losses are easily obtainable and hence it helps in taking necessary action to decrease them [6,7].…”

Section: Introductionmentioning

confidence: 99%

Ti Microholes Potential for Thermal Power Plants Application Punched by WC/Co Micropunch

Guo¹,

Tam²

2018

Thermal Power Plants - New Trends and Recent Developments

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The use of microholes is a potential approach to enhance fluid flow and heat exchange within thermal power plants, especially for the turbines. Ascribed to eco environmental competition, micropunching is extremely suitable for the mass production of micro features with friendly eco effects. Therefore, the morphology variation of micropunch and microhole during the punching with WC/Co micropunches was investigated by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and confocal laser. Results reveal that due to the optimal joint contribution of WC and Co, the formed microholes satisfy with the practical requirements in the quasi stable period. Moreover, the serious wear of micropunch occurs with the wear loss both of Co and WC when the punching number exceeds 1525. With the further increment in punching numbers, the dominant factors of the wear loss would mainly rely on the easily peeled off WC due to the serious loss of Co. In addition, the microholes can be adequately processed after about 30 min by natural sand grains. The quality of the hole would decrease with further increase in processing time and sand accumulation becomes severe.

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Using Exergy to Understand and Improve the Efficiency of Electrical Power Technologies

Cited by 87 publications

References 17 publications

Modelling the energy and exergy utilisation of the Mexican non-domestic sector: A study by climatic regions

Modelling the energy and exergy utilisation of the Mexican non-domestic sector: A study by climatic regions

Comprehensive Investigation Into the Exergy Values of Six Rice Husks

Ti Microholes Potential for Thermal Power Plants Application Punched by WC/Co Micropunch

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