An application of the extended exergy accounting method to the Turkish society, year 2006

Seçkin, Candeniz; Sciubba, Enrico; Bayülken, Ahmet

doi:10.1016/j.energy.2012.02.018

Cited by 42 publications

(17 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Animal skins production data (including wool) is only available for goats and sheep but the absence of a specific exergetic value for skins lead us to consider only the wool production flux that has a specific exergy of 5850 kJ/kg [51]. However, its exergetic value is very low ranging from 51 TJ in 2000 to 35 TJ in 2012.…”

Section: Datamentioning

confidence: 99%

Do the Different Exergy Accounting Methodologies Provide Consistent or Contradictory Results? A Case Study with the Portuguese Agricultural, Forestry and Fisheries Sector

2017

View full text Add to dashboard Cite

Three exergy accounting approaches are used to evaluate exergy efficiency: the Energy Resources Exergy Accounting (EREA), the Natural Resources' Exergy Accounting (NREA) and the Extended Exergy Accounting (EEA). To test the consistency of the results provided by these methodologies, we apply them to evaluate the Portuguese agricultural, forestry and fisheries (AFF) sector, from 2000 to 2012. EREA shows an increase of 30% in the efficiency of the Portuguese AFF sector, while NREA and EEA methodologies increases of 27% and 43%, respectively. Although the results are consistent for the AFF sector, the same does not happen in the fisheries subsector, whose exergetic efficiency increases 14% with the EREA but decreases 42% with the NREA approach. The ratio of output to useful exergy reveals that a better thermodynamic efficiency is not translated into a higher energy service efficiency because fishing vessels have to travel more to get the same fish. Thus, results provided by the EREA and NREA approaches are complementary and both are needed to provide a realistic picture of exergy efficiency. On the other hand, results obtained by the EEA approach are dominated by capital and environmental impacts, revealing the disproportionality between material and immaterial inputs in this methodology.

show abstract

Section: Datamentioning

confidence: 99%

Do the Different Exergy Accounting Methodologies Provide Consistent or Contradictory Results? A Case Study with the Portuguese Agricultural, Forestry and Fisheries Sector

2017

View full text Add to dashboard Cite

show abstract

“…A system analysis based on EE results in an costing method called Extended Exergy Accounting (EEA) The word "accounting" is used as a reminder that exergy in not conserved in real processes, and therefore-in rigorous terms-no "exergy balance equation" exists. whose details are described in [8,[20][21][22]. What is of interest for the purpose of the present discussion is that the EE of a product includes (in a space and time integral sense):…”

Section: Extended Exergy Accounting Eeamentioning

confidence: 99%

A Critical Interpretation and Quantitative Extension of the Sama-Szargut Second Law Rules in an Extended Exergy Perspective

Sciubba

2014

Energies

View full text Add to dashboard Cite

Twenty-five years ago, Gaggioli, Sama and Qian published a series of 10 "second law guidelines" for design and process engineers, nicknamed at that time "the Gaggioli-Sama rules". These guidelines, some of them previously published by Sama between 1980 and 1983, are a compilation of "second law errors" to avoid in the design of energy conversion systems. The list was rearranged several times, until a revised version containing 21 rules was published by Sama and Szargut in 1995. Ever since, these guidelines came to be known as "the Sama-Szargut rules". The rules are a series of well-formulated and insightful suggestions that reflect a thermodynamicist's idea that the "best design" is the one that minimizes the overall irreversibility in a process or plant, under the prescribed technological constraints. Characteristically, the concept of "optimal system" is completely absent, the emphasis being on the extensive inclusion of second law reasoning into design decisions. A critical analysis of the rules would suggest that all of them be routinely implemented both in new designs and most important in retrofit projects. A survey of some of the current most common energy conversion installations shows that, quite on the contrary, most of the rules are disregarded in practical applications. This paper argues that the reason for this incongruency is the neglection in the engineering design decision of the real cost of installation, operation and decommissioning of a plant, and proposes a rephrasing of the rules in an extended exergy perspective: if the production cost, including the externalities, is measured in units of equivalent primary exergy, the Sama-Szargut rules can be directly interpreted in this sense, and abidance by the rules results in the reduction of the resource cost for any given objective. OPEN ACCESSEnergies 2014, 7 5358

show abstract

“…Chinese energy policy maker should pay attention to this problem. Some materials such as aluminum and steel, are easily recyclable and thus their post-consumer recycling takes much less energy than production of finished materials from virgin feedstocks [24,25].…”

Section: Changes Of Working Hoursmentioning

confidence: 99%

Diesel Consumption of Agriculture in China

et al. 2012

Energies

View full text Add to dashboard Cite

Abstract:As agricultural mechanization accelerates the development of agriculture in China, to control the growth of the resulting energy consumption of mechanized agriculture without negatively affecting economic development has become a major challenge. A systematic analysis of the factors (total power, unit diesel consumption, etc.) influencing diesel consumption using the SECA model, combined with simulations on agricultural diesel flows in China between 1996 and 2010 is performed in this work. Seven agricultural subsectors, fifteen categories of agricultural machinery and five farm operations are considered. The results show that farming and transportation are the two largest diesel consumers, accounting for 86.23% of the total diesel consumption in agriculture in 2010. Technological progress has led to a decrease in the unit diesel consumption and an increase in the unit productivity of all machinery, and there is still much potential for future progress. Additionally, the annual average working hours have decreased rapidly for most agricultural machinery, thereby influencing the development of mechanized agriculture.

show abstract

An application of the extended exergy accounting method to the Turkish society, year 2006

Cited by 42 publications

References 43 publications

Do the Different Exergy Accounting Methodologies Provide Consistent or Contradictory Results? A Case Study with the Portuguese Agricultural, Forestry and Fisheries Sector

Do the Different Exergy Accounting Methodologies Provide Consistent or Contradictory Results? A Case Study with the Portuguese Agricultural, Forestry and Fisheries Sector

A Critical Interpretation and Quantitative Extension of the Sama-Szargut Second Law Rules in an Extended Exergy Perspective

Diesel Consumption of Agriculture in China

Contact Info

Product

Resources

About