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How Much Detail Should We Use to Compute Societal Aggregated Exergy Efficiencies?

Author

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  • Miguel Palma

    (Maretec, Environment and Energy Scientific Area, DEM, Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • Tânia Sousa

    (Maretec, Environment and Energy Scientific Area, DEM, Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • Zeus Guevara

    (Maretec, Environment and Energy Scientific Area, DEM, Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

Abstract

The current method used for calculating societal aggregated exergy efficiencies is reviewed. Cooling is introduced as an end-use category; conversion efficiencies for heating processes are obtained for each energy carrier; and electricity shares per end-use are retrieved for each sector, improving the accuracy of the estimated values of aggregated exergy efficiencies. We show that: (1) cooling uses are a relevant end-use in Portugal and that their introduction decreased overall efficiency by 3.4% in 2009; and (2) disaggregating the heating second law efficiencies for each energy carrier has a significant effect on the aggregated efficiencies of the country, decreasing aggregated efficiency by 1.3% in 2009. We studied two other factors that showed no significant impact on aggregated exergy efficiency: a technological lag of 10 years in the efficiency of stationary mechanical drive devices and the use of a year-specific ambient temperature to compute exergy efficiencies of heating processes.

Suggested Citation

  • Miguel Palma & Tânia Sousa & Zeus Guevara, 2016. "How Much Detail Should We Use to Compute Societal Aggregated Exergy Efficiencies?," Energies, MDPI, vol. 9(5), pages 1-13, May.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:5:p:364-:d:70125
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    References listed on IDEAS

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    Cited by:

    1. Ricardo Manso & Tânia Sousa & Tiago Domingos, 2017. "Do the Different Exergy Accounting Methodologies Provide Consistent or Contradictory Results? A Case Study with the Portuguese Agricultural, Forestry and Fisheries Sector," Energies, MDPI, vol. 10(8), pages 1-31, August.
    2. Guevara, Zeus & Domingos, Tiago, 2017. "Three-level decoupling of energy use in Portugal 1995–2010," Energy Policy, Elsevier, vol. 108(C), pages 134-142.
    3. Victor Court, 2019. "An Estimation of Different Minimum Exergy Return Ratios Required for Society," Biophysical Economics and Resource Quality, Springer, vol. 4(3), pages 1-13, September.
    4. Sousa, Tânia & Brockway, Paul E. & Cullen, Jonathan M. & Henriques, Sofia Teives & Miller, Jack & Serrenho, André Cabrera & Domingos, Tiago, 2017. "The Need for Robust, Consistent Methods in Societal Exergy Accounting," Ecological Economics, Elsevier, vol. 141(C), pages 11-21.
    5. Pinto, Ricardo & Henriques, Sofia T. & Brockway, Paul E. & Heun, Matthew Kuperus & Sousa, Tânia, 2023. "The rise and stall of world electricity efficiency:1900–2017, results and insights for the renewables transition," Energy, Elsevier, vol. 269(C).
    6. Matthew K. Heun & João Santos & Paul E. Brockway & Randall Pruim & Tiago Domingos & Marco Sakai, 2017. "From Theory to Econometrics to Energy Policy: Cautionary Tales for Policymaking Using Aggregate Production Functions," Energies, MDPI, vol. 10(2), pages 1-44, February.
    7. Laura Felício & Sofia T. Henriques & André Serrenho & Tiago Domingos & Tânia Sousa, 2019. "Insights from Past Trends in Exergy Efficiency and Carbon Intensity of Electricity: Portugal, 1900–2014," Energies, MDPI, vol. 12(3), pages 1-22, February.
    8. Zeus Guevara & Tânia Sousa & Tiago Domingos, 2016. "Insights on Energy Transitions in Mexico from the Analysis of Useful Exergy 1971–2009," Energies, MDPI, vol. 9(7), pages 1-29, June.

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