Long-Term Shifts in Life-Cycle Energy Efficiency and Carbon Intensity
| Autor: | Kenneth Gillingham, Jacob Teter, Sonia Yeh, Geoffrey M. Morrison, Xavier Riera-Palou, Gouri Shankar Mishra, Raul Quiceno |
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| Rok vydání: | 2013 |
| Předmět: |
Greenhouse Effect
Fossil Fuels Engineering Primary energy business.industry Natural resource economics Fossil fuel Environmental engineering chemistry.chemical_element General Chemistry Carbon Environmental Policy Renewable energy chemistry Greenhouse gas Thermodynamics Environmental Chemistry Energy transformation Renewable Energy business Intensity (heat transfer) Efficient energy use |
| Zdroj: | Environmental Science & Technology. 47:2494-2501 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/es3029268 |
| Popis: | The quantity of primary energy needed to support global human activity is in large part determined by how efficiently that energy is converted to a useful form. We estimate the system-level life-cycle energy efficiency (EF) and carbon intensity (CI) across primary resources for 2005-2100. Our results underscore that although technological improvements at each energy conversion process will improve technology efficiency and lead to important reductions in primary energy use, market mediated effects and structural shifts toward less efficient pathways and pathways with multiple stages of conversion will dampen these efficiency gains. System-level life-cycle efficiency may decrease as mitigation efforts intensify, since low-efficiency renewable systems with high output have much lower GHG emissions than some high-efficiency fossil fuel systems. Climate policies accelerate both improvements in EF and the adoption of renewable technologies, resulting in considerably lower primary energy demand and GHG emissions. Life-cycle EF and CI of useful energy provide a useful metric for understanding dynamics of implementing climate policies. The approaches developed here reiterate the necessity of a combination of policies that target efficiency and decarbonized energy technologies. We also examine life-cycle exergy efficiency (ExF) and find that nearly all of the qualitative results hold regardless of whether we use ExF or EF. |
| Databáze: | OpenAIRE |
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