how much detail should we use to compute societal aggregated exergy efficiencies?
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2016
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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.
| Reference Key |
palma2016energieshow
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|---|---|
| Authors | ;Miguel Palma;Tânia Sousa;Zeus Guevara |
| Journal | acs combinatorial science |
| Year | 2016 |
| DOI |
10.3390/en9050364
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| URL | |
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