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Improved exergetic life cycle assessment through matrix reduction technique

  • EXERGY AND LCA
  • Published:
The International Journal of Life Cycle Assessment Aims and scope Submit manuscript

Abstract

Purpose

The concept of exergy can be used in LCA to quantify the value of natural resources consumed in production processes, as well as to assess the environmental impacts of waste streams. Prior studies noted the complexity of exergy accounting for wastes due to the diversity and complexity of waste streams. We develop an improved method to allow for rigorous exergy accounting of both resources and wastes.

Methods

The exergy content of a mass stream depends on many physical characteristics, including temperature, pressure, and chemical composition. We develop a novel matrix reduction technique to reduce data gathering requirements by multiple orders of magnitude. This method predivides the impact matrix into key rows and processes and “rest of economy” flows. Thermodynamic data can then be gathered for key flows emitted by key processes, and all other flows can be modeled using default values with little loss of accuracy.

Results and discussion

Our method is applied to an example LCA of electricity production via a natural gas combined cycle (NGCC) system. The case study finds that life cycle (economy-wide) exergetic efficiency of NGCC electricity production is ≈43 %, compared to a plant-level (local) exergetic efficiency of ≈54 %. The exergy content of life cycle waste flows is contained primarily in chemical exergy and physical exergy of flue gases, with nearly equal contributions. These waste exergy fluxes represent ≈3 % each of total input exergy.

Conclusions

The matrix reduction technique is found to be robust to assumptions about flows that are not directly modeled. By examining ranges of reasonable assumptions about mass flows not specifically modeled, we show that key rows and processes account for the vast majority of exergy content of interventions.

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References

  • Alvarenga RA, Dewulf J et al (2013) Exergy-based accounting for land as a natural resource in life cycle assessment. Int J Life Cycle Assess 3(18):939–947

    Article  Google Scholar 

  • Ayres RU, Ayres LW, Martinas K (1996) Eco-thermodynamics: exergy and life cycle analysis. INSEAD working paper

  • Ayres RU, Ayres LW, Martinas K (1998) Exergy, waste accounting, and life-cycle analysis. Energy 23:355–363

    Article  CAS  Google Scholar 

  • Black J et al 2013) Cost and performance baseline for fossil energy plants volume 1: bituminous coal and natural gas to electricity. Technical Report, 2013. National Energy Technology Laboratory, U.S. Department of Energy

  • Bosch ME, Hellweg S et al (2007) Applying cumulative exergy demand (CExD) indicators to the ecoinvent database. Int J Life Cycle Assess 12:181–190

    Article  CAS  Google Scholar 

  • Brandt AR, Dale M (2011) A general mathematical framework for systems-scale efficiency of energy extraction and conversion: energy return on investment (EROI) and other energy return ratios. Energies 4:1211–1245

    Article  Google Scholar 

  • Brandt AR, Dale M, Barnhart CJ (2013) Calculating systems-scale energy efficiency and net energy returns: a bottom-up matrix-based approach. Energy 62:235–247

    Article  Google Scholar 

  • Cornelissen RL, Hirs GG (1998) Exergy analysis of cryogenic air separation. Energ Convers Manag 39:1821–1826

    Article  CAS  Google Scholar 

  • Cornellisen R (1997) Thermodynamics and sustainable development: the use of exergy analysis and the reduction of irreversibility. Ph.D. thesis, Universitet Twente, Enschede, Netherlands

  • Crane P, Scott DS, Rosen MA (1992) Comparison of exergy of emissions from two energy conversion technologies, considering the potential for environmental impact. Int J Hydrogen Energy 17:345–350

    Article  CAS  Google Scholar 

  • DeMeester B, DeWulf J et al (2006) An improved calculation of the exergy of natural resources for exergetic life cycle assessment. Environ Sci Technol 40:6844–6851

    Article  CAS  Google Scholar 

  • Dewulf J, Van Langenhove H (2002) Assessment of the sustainability of technology by means of a thermodynamically based life cycle analysis. Environ Sci Pollut Res 9:267–273

    Article  CAS  Google Scholar 

  • Dewulf J, Van Langenhove H et al (2000) Illustrations towards quantifying the sustainability of technology. Green Chem 2:108–114

    Article  CAS  Google Scholar 

  • Dewulf J, Van Langenhove H, Dirckx J (2002) Exergy analysis in the assessment of the sustainability of waste gas treatment systems. Sci Total Environ 273:41–52

    Article  Google Scholar 

  • Dewulf J, Bosch ME et al (2007) Cumulative exergy extraction from the natural environment (CEENE): a comprehensive life cycle impact assessment method for resource accounting. Environ Sci Technol 41:8477–8486

    Article  CAS  Google Scholar 

  • Dincer I, Rosen MA (2012) Exergy: energy, environment and sustainable development, 2nd ed; Elsevier Ltd

  • Dukes JS (2003) Burning buried sunshine: human consumption of ancient solar energy. Clim Chang 61:31–44

    Article  CAS  Google Scholar 

  • Ecoinvent Centre (2013a) Introduction to ecoinvent version 3 for existing users. http://www.ecoinvent.org/database/ecoinvent-version-3/introduction/

  • Ecoinvent Centre (2013b) Documentation of changes implemented in ecoinvent database 3.0

  • Eliasson ET, Thorhallsson S et al (2011) Short course of geothermal drilling. Resource development and power plants

  • Finnveden G, Ostlund P (1997) Exergies of natural resources in life-cycle assessment and other applications. Energy 22:923–931

    Article  CAS  Google Scholar 

  • GISS (2014) GISS Surface temperature analysis, The elusive absolute surface air temperature. http://data.giss.nasa.gov/gistemp/abs_temp.html. Page updated February 2014

  • Gutowski TG, Branham MS (2009) Thermodynamic analysis of resources used in manufacturing process. Environ Sci Technol 43:1584–1590

    Article  CAS  Google Scholar 

  • Heijungs R, Suh S (2002) The computational structure of life cycle assessment. Kluwer Academic Publishers

  • Hermann WA (2005) Quantifying global exergy resources. Energy 31:1685–1702

    Article  Google Scholar 

  • Kameyama H, Yoshida K et al (1982) Evaluation of reference exergies for the elements. Appl Energy 11:69–83

    Article  CAS  Google Scholar 

  • Koroneos C, Stylos N (2014) Exergetic life cycle assessment of a grid-connected, polycrystaline silicon photovoltaic system. Int J Life Cycle Assess 19:1716–1732

    Article  CAS  Google Scholar 

  • Madden M, Lewis A, Davis M (2013) Thermal effluent from the power sector: an analysis of once-through cooling system impact on surface water temperature. Environ Res Lett 8:035006

    Article  Google Scholar 

  • Majewski W (1979) Predicting effects of power plant once-through cooling on aquatic systems. UNESCO technical report

  • MathWorks (2012) MATLAB, the language of technical computing

  • Patil SS, Verma HK, Kumar A (2010) Efficiency measurements of hydro machine by thermodynamic method. IGHEM-2010, Oct. 21–23, 2010, AHEC, IIT Roorkee, India

  • Rant Z (1956) Exergy, a new word for “technical available work” (in German). Forsch Ing-Wes

  • Rivero R, Garfias M (2006) Standard chemical exergy of elements updated. Energy 31:3310–3326

    Article  CAS  Google Scholar 

  • Rocco M, Colombo E, Sciubba E (2014) Advances in exergy analysis: a novel assessment of the extended exergy accounting method. Appl Energy 113:1405–1420

    Article  Google Scholar 

  • Sciubba E (1999) Exergy as a direct measure of environmental impact. Proce ASME Adv Energy Syst Div:573–581

  • Sciubba E (2001) Beyond thermodynamics? The concept of extended exergy accounting and its application to the analysis and design of thermal systems. Exergy Int J 1:68–84

    Article  Google Scholar 

  • Sciubba E (2003) Extended exergy accounting applied to energy recovery from waste: the concept of total recycling. Energy 28:1315–1334

    Article  Google Scholar 

  • Seager TP, Theis TL (2002a) Exergetic pollution potential: estimating the revocability of chemical pollution. Exergy Int J 2:273–282

    Article  Google Scholar 

  • Seager TP, Theis TLA (2002b) Uniform definition and quantitative basis for industrial ecology. J Clean Prod 10:225–235

    Article  Google Scholar 

  • Simpson AP, Edwards CF (2011) An exergy-based framework for evaluating environmental impact. Energy 36:1442–1459

    Article  Google Scholar 

  • Sweeney Smith S (2014) Exergetic life cycle assessment of carbon capture and sequestration technology. MS Thesis, Stanford University, Department of Energy Resources Engineering

  • Szargut J (1978) Minimization of the consumption of resources. Bull Pol Acad Sci-Tech 26:41–45

    Google Scholar 

  • Szargut J (1985) Application of exergy for the calculation of environmental cost. Bull Pol Acad Sci-Tech 34:475–480

    Google Scholar 

  • Szargut J (2005) Exergy method—technical and ecological applications. WIT Press

  • Szargut J, Valero A et al (2005) Towards an international legal reference environment. Proceedings of 18th international conference on efficiency, cost, optimization, simulation and environmental impact of energy systems

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Acknowledgments

This project was funded by the Global Climate and Energy Project (GCEP) at Stanford University. We thank collaborator Christopher Edwards for many helpful discussions.

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Authors and Affiliations

  1. Department of Energy Resources Engineering, Stanford University, Stanford, CA, USA

    Stuart Sweeney Smith & Adam R. Brandt

  2. Department of Mechanical Engineering, Stanford University, Stanford, CA, USA

    Adelaide Calbry-Muzyka

Authors
  1. Stuart Sweeney Smith
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  2. Adelaide Calbry-Muzyka
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  3. Adam R. Brandt
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Corresponding author

Correspondence to Adam R. Brandt.

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Responsible editor: Christopher J Koroneos

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Sweeney Smith, S., Calbry-Muzyka, A. & Brandt, A.R. Improved exergetic life cycle assessment through matrix reduction technique. Int J Life Cycle Assess 21, 1379–1390 (2016). https://doi.org/10.1007/s11367-016-1118-5

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  • DOI: https://doi.org/10.1007/s11367-016-1118-5

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