Next Article in Journal
Review of Core/Shell Quantum Dots Technology Integrated into Building’s Glazing
Next Article in Special Issue
Assessment of the Energy Efficiency Improvement of Twenty-Five Countries: A DEA Approach
Previous Article in Journal
Numerical Simulation and Experimental Investigation of Diesel Fuel Reforming over a Pt/CeO2-Al2O3 Catalyst
Previous Article in Special Issue
Analysis and Forecasting of the Carbon Price in China’s Regional Carbon Markets Based on Fast Ensemble Empirical Mode Decomposition, Phase Space Reconstruction, and an Improved Extreme Learning Machine
Article

Coupling Exergy with the Emission of Greenhouse Gases in Bioenergy: A Case Study Using Biochar

1
Department of Mechanical Engineering, Federal Institute of Goiás—IFG, Goiânia 74055-110, Brazil
2
Department of Mechanical Engineering, Faculty of Technology, University of Brasilia, Brasilia 70910-900, Brazil
3
Department of Chemistry, Federal Institute of Goiás—IFG, Goiânia 74055-110, Brazil
*
Author to whom correspondence should be addressed.
Energies 2019, 12(6), 1057; https://doi.org/10.3390/en12061057
Received: 11 February 2019 / Revised: 12 March 2019 / Accepted: 13 March 2019 / Published: 19 March 2019
(This article belongs to the Special Issue Energy and Environment)
The loss in the quality of energy throughout any process can be assessed by the thermodynamics magnitude related to its entropic performance—the exergy. This indicator has been suggested as an environmental index, as an alternative to life cycle assessment (LCA), which is a classic tool for this purpose. This study assesses the potential of coupling the life cycle approach and exergy in a bioenergy supply chain environmental performance characterization, examining two scenarios in the sugarcane agroindustry. The first one, the reference scenario, is a classical production, and the second includes the returning of a portion of residual biomass from the plant, in the form of biochar, to agricultural soil. The use of biochar engendered an increase in sugarcane productivities and a reduction of nitrous oxide emissions. These changes resulted in scenarios 1 and 2, reducing the exergy destroyed from 390 to 355 MJ/MJ ethanol (9.0%) and decreasing the greenhouse gases emissions (GHG) from 11.8 to 11.0 g CO2-equivalent/MJ ethanol (6.8%). The latter represents an improvement in the use of carbon. A sensitivity analysis showed that the effect of changing productivity was quite significant: The exergy showed a sensitivity of −0.49, and in total emissions, this figure was slightly lower, at −0.41. By changing the emissions of N2O in the soil, the sensitivity of exergy was almost null, and the total emissions were 0.077. View Full-Text
Keywords: coupling; LCA; biochar; bioenergy; exergy coupling; LCA; biochar; bioenergy; exergy
Show Figures

Figure 1

MDPI and ACS Style

Araújo Júnior, J.; Caldeira-Pires, A.; Oliveira, S. Coupling Exergy with the Emission of Greenhouse Gases in Bioenergy: A Case Study Using Biochar. Energies 2019, 12, 1057. https://doi.org/10.3390/en12061057

AMA Style

Araújo Júnior J, Caldeira-Pires A, Oliveira S. Coupling Exergy with the Emission of Greenhouse Gases in Bioenergy: A Case Study Using Biochar. Energies. 2019; 12(6):1057. https://doi.org/10.3390/en12061057

Chicago/Turabian Style

Araújo Júnior, Jair, Armando Caldeira-Pires, and Sérgio Oliveira. 2019. "Coupling Exergy with the Emission of Greenhouse Gases in Bioenergy: A Case Study Using Biochar" Energies 12, no. 6: 1057. https://doi.org/10.3390/en12061057

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop