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Article: Energy, exergy and exergoenvironmental analyses of a sugarcane bagasse power cogeneration system.

Cavalcanti, Eduardo J C / Carvalho, Monica / da Silva, Daniel R S

2020 Volume 222, Page(s) 113232

Abstract: One of the strategies to reduce the environmental impacts associated with electricity is to employ renewable resources such as biomass or even waste. However, the evaluation of the sustainability of a power plant depends on the development of several ... ...

Abstract	One of the strategies to reduce the environmental impacts associated with electricity is to employ renewable resources such as biomass or even waste. However, the evaluation of the sustainability of a power plant depends on the development of several analyses, which should encompass thermodynamic and environmental parameters. Energy, exergy, and exergoenvironmental assessments are carried out for a sugarcane bagasse cogeneration system, along with a Life Cycle Assessment for the Brazilian sugarcane bagasse, employing the Eco-indicator 99 method. The specific environmental impacts of electricity and steam are 6.023 mPt/MJ and 4.038 mPt/MJ, respectively, and the boiler feed pump and radiator presented the highest average environmental impact per exergy of fuel and product, respectively. The component with the highest exergoenvironmental factor was the furnace (60.32%), demonstrating margins for benefits in the formation of pollutants and destruction of exergy. Exergoenvironmental assessments can be utilized to support the adoption of more efficient (although more complex) cogeneration systems, especially in the aftermath of the COVID-19 crisis.
Keywords	covid19
Language	English
Publishing date	2020-07-23
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	2000891-0
ISSN	0196-8904
ISSN	0196-8904
DOI	10.1016/j.enconman.2020.113232
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Energy, exergy and exergoenvironmental analyses of a sugarcane bagasse power cogeneration system

Cavalcanti, Eduardo J.C / Carvalho, Monica / da Silva, Daniel R.S

Energy conversion and management. 2020 Oct. 15, v. 222

2020

Abstract	One of the strategies to reduce the environmental impacts associated with electricity is to employ renewable resources such as biomass or even waste. However, the evaluation of the sustainability of a power plant depends on the development of several analyses, which should encompass thermodynamic and environmental parameters. Energy, exergy, and exergoenvironmental assessments are carried out for a sugarcane bagasse cogeneration system, along with a Life Cycle Assessment for the Brazilian sugarcane bagasse, employing the Eco-indicator 99 method. The specific environmental impacts of electricity and steam are 6.023 mPt/MJ and 4.038 mPt/MJ, respectively, and the boiler feed pump and radiator presented the highest average environmental impact per exergy of fuel and product, respectively. The component with the highest exergoenvironmental factor was the furnace (60.32%), demonstrating margins for benefits in the formation of pollutants and destruction of exergy. Exergoenvironmental assessments can be utilized to support the adoption of more efficient (although more complex) cogeneration systems, especially in the aftermath of the COVID-19 crisis.
Keywords	Coronavirus infections ; administrative management ; biomass ; cogeneration systems ; electricity ; environmental factors ; environmental impact ; exergy ; fuels ; furnaces ; life cycle assessment ; pollutants ; power plants ; renewable resources ; steam ; sugarcane bagasse ; wastes
Language	English
Dates of publication	2020-1015
Publishing place	Elsevier Ltd
Document type	Article
Note	NAL-light
ZDB-ID	2000891-0
ISSN	0196-8904
ISSN	0196-8904
DOI	10.1016/j.enconman.2020.113232
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Ventilatory Variables and Mechanical Power in Patients with Acute Respiratory Distress Syndrome.

Costa, Eduardo L V / Slutsky, Arthur S / Brochard, Laurent J / Brower, Roy / Serpa-Neto, Ary / Cavalcanti, Alexandre B / Mercat, Alain / Meade, Maureen / Morais, Caio C A / Goligher, Ewan / Carvalho, Carlos R R / Amato, Marcelo B P

American journal of respiratory and critical care medicine

2021 Volume 204, Issue 3, Page(s) 303–311

Abstract: Rationale: ...

Abstract	Rationale:
Language	English
Publishing date	2021-09-01
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1180953-x
ISSN	1535-4970 ; 0003-0805 ; 1073-449X
ISSN (online)	1535-4970
ISSN	0003-0805 ; 1073-449X
DOI	10.1164/rccm.202009-3467OC
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Energy, exergy and exergoenvironmental analyses of a sugarcane bagasse power cogeneration system

Cavalcanti, Eduardo J.C. / Carvalho, Monica / da Silva, Daniel R.S.

Energy Convers. Manage.

Abstract	One of the strategies to reduce the environmental impacts associated with electricity is to employ renewable resources such as biomass or even waste. However, the evaluation of the sustainability of a power plant depends on the development of several analyses, which should encompass thermodynamic and environmental parameters. Energy, exergy, and exergoenvironmental assessments are carried out for a sugarcane bagasse cogeneration system, along with a Life Cycle Assessment for the Brazilian sugarcane bagasse, employing the Eco-indicator 99 method. The specific environmental impacts of electricity and steam are 6.023 mPt/MJ and 4.038 mPt/MJ, respectively, and the boiler feed pump and radiator presented the highest average environmental impact per exergy of fuel and product, respectively. The component with the highest exergoenvironmental factor was the furnace (60.32%), demonstrating margins for benefits in the formation of pollutants and destruction of exergy. Exergoenvironmental assessments can be utilized to support the adoption of more efficient (although more complex) cogeneration systems, especially in the aftermath of the COVID-19 crisis.
Keywords	covid19
Publisher	WHO
Document type	Article
Note	WHO #Covidence: #663098
Database	COVID19

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Article: Comparison of carbon capture system and concentrated solar power in natural gas combined cycle: Exergetic and exergoenvironmental analyses

Cavalcanti, Eduardo J.C / de Souza, Gabriel F / Lima, Matheus S.R

Renewable energy. 2019 Nov. 27,

2019

Abstract: Two emissions mitigation systems, as CO2 capture and storage (CCS) and concentrated solar power (CSP) have been investigated to a power plant based on exergetic and exergoenvironmental analyses. A base plant of natural gas combined cycle for power ... ...

Abstract	Two emissions mitigation systems, as CO2 capture and storage (CCS) and concentrated solar power (CSP) have been investigated to a power plant based on exergetic and exergoenvironmental analyses. A base plant of natural gas combined cycle for power production is taken as case study. The CSP technology used is parabolic trough collector (PTC) with two storage tanks. The environmental impact indicator used is the eco-indicator 99. The outcomes indicate that the natural gas heater exchanger should have its exergy destruction reduced to improve the performance of all system. The CCS plant reduced the net power and the PTC plant increased slightly the net power in relation to the base plant. The specific environmental impact of CCS plant was increased and of PTC plant was slightly decreased. The environmental impact of fuel production is the main environmental burden in the environmental performance. Therefore, the PTC system is the best case of mitigation system. Discussions about further improvements have been proposed.
Keywords	carbon ; carbon dioxide ; carbon sequestration ; case studies ; emissions ; environmental impact ; environmental performance ; exergy ; fuel production ; natural gas ; power generation ; power plants ; solar collectors ; solar energy ; tanks
Language	English
Dates of publication	2019-1127
Publishing place	Elsevier Ltd
Document type	Article
Note	Pre-press version
ZDB-ID	2001449-1
ISSN	0960-1481
ISSN	0960-1481
DOI	10.1016/j.renene.2019.11.153
Database	NAL-Catalogue (AGRICOLA)

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Article: Exergoeconomic and exergoenvironmental comparison of diesel-biodiesel blends in a direct injection engine at variable loads

Cavalcanti, Eduardo J.C / Carvalho, Monica / Ochoa, Alvaro A.V

Energy conversion and management. 2019 Mar. 01, v. 183

2019

Abstract: The use of biodiesel produces less pollution than petroleum diesel, and any application that utilizes diesel fuel can use biodiesel. However, the intention is not to fully substitute petroleum diesel but to help extend the usefulness of petroleum, ... ...

Abstract	The use of biodiesel produces less pollution than petroleum diesel, and any application that utilizes diesel fuel can use biodiesel. However, the intention is not to fully substitute petroleum diesel but to help extend the usefulness of petroleum, supporting the longevity and cleanliness of diesel engines, and possibly create a balanced energy policy. This study employed exergy, exergoeconomic and exergoenvironmental analyses to verify the effect of engine load and biodiesel concentration in a stationary, direct injection diesel engine. The Life Cycle Assessment methodology was applied within Simapro software to quantify the environmental impacts associated with the consumption of diesel and biodiesel, utilizing the Eco-indicator 99 environmental impact assessment method. Analyses included the calculation of exergy efficiency, specific cost, specific environmental impacts, and exergoeconomic and exergoenvironmental impact factors. It was verified that full load operation presented the best results in all analyses. Exergy analysis revealed that low biodiesel concentration presented slightly higher efficiency. Although the specific cost of biodiesel was double the specific cost of diesel (1.55 US$/kg versus 0.76 US$/kg), biodiesel presented lower environmental impacts (55.8 mPt/kg versus 240 mPt/kg for diesel). It was verified that exergy efficiency increased along with capacity load, but increases in the concentration of biodiesel yielded lower exergy efficiencies. The exergoeconomic factor decreased as exergy destruction and exergy losses increased, and specific environmental impacts decreased with increases in power or in biodiesel concentration. A case is made for the outstanding benefits around understanding how environmental impacts are formed to pinpoint where changes should be implemented (herein, focus is on fuel and pollutant formation).
Keywords	biodiesel ; computer software ; diesel engines ; diesel fuel ; energy policy ; environmental assessment ; environmental impact ; exergy ; life cycle assessment ; longevity ; petroleum ; pollutants ; pollution
Language	English
Dates of publication	2019-0301
Size	p. 450-461.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2000891-0
ISSN	0196-8904
ISSN	0196-8904
DOI	10.1016/j.enconman.2018.12.113
Database	NAL-Catalogue (AGRICOLA)

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Article: Exergoenvironmental results of a eucalyptus biomass-fired power plant

Cavalcanti, Eduardo J.C / Carvalho, Monica / B. Azevedo, Jonathan L

Energy. 2019 Dec. 15, v. 189

2019

Abstract: Forest biomass has always played an important role in the Brazilian energy mix, with eucalyptus presenting high levels of production and productivity. Due to the high expected potential of this woody biomass, this study assesses this resource for thermal ...

Abstract	Forest biomass has always played an important role in the Brazilian energy mix, with eucalyptus presenting high levels of production and productivity. Due to the high expected potential of this woody biomass, this study assesses this resource for thermal energy production, contributing to the expansion of this sector and to energy transition strategies. This study developed a Life Cycle Assessment (LCA) to quantify the environmental impacts associated with the combustion of eucalyptus. LCA data, which included the procurement of eucalyptus and wood ash treatment, was implemented in exergy and exergoenvironmental analyses, based on the SPecific Exergy COsting (SPECO) approach, for a steam power plant fueled by eucalyptus biomass. Fuel combustion takes into account the formation of pollutants. The high moisture content of biomass affects the overall and boiler exergy efficiencies. The components with worse environmental performance are those with high environmental impact rates associated with exergy destruction (feed water and pump). The environmental impact rate per exergy unit of electricity is 7715 mPt/GJ. A sensitivity analysis verifies the effect of biomass moisture on boiler efficiency and on the specific environmental impact associated with power, concluding that an increase in boiler efficiency increases global efficiency and decreases the specific environmental impact, resulting in a reduction of global exergy destruction.
Keywords	Eucalyptus ; electricity ; environmental impact ; environmental performance ; exergy ; forests ; fuel combustion ; life cycle assessment ; pollutants ; power plants ; steam ; thermal energy ; water content ; wood ash ; woody biomass
Language	English
Dates of publication	2019-1215
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2019804-8
ISSN	0360-5442 ; 0360-5442
ISSN (online)	0360-5442
ISSN	0360-5442
DOI	10.1016/j.energy.2019.116188
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Ecological modeling, biogeography, and phenotypic analyses setting the tiger cats' hyperdimensional niches reveal a new species.

de Oliveira, Tadeu G / Fox-Rosales, Lester A / Ramírez-Fernández, José D / Cepeda-Duque, Juan C / Zug, Rebecca / Sanchez-Lalinde, Catalina / Oliveira, Marcelo J R / Marinho, Paulo H D / Bonilla-Sánchez, Alejandra / Marques, Mara C / Cassaro, Katia / Moreno, Ricardo / Rumiz, Damián / Peters, Felipe B / Ortega, Josué / Cavalcanti, Gitana / Mooring, Michael S / Blankenship, Steven R / Brenes-Mora, Esteban /

Scientific reports

2024 Volume 14, Issue 1, Page(s) 2395

Abstract: Recently, the tiger-cat species complex was split into Leopardus tigrinus and Leopardus guttulus, along with other proposed schemes. We performed a detailed analysis integrating ecological modeling, biogeography, and phenotype of the four originally ... ...

Abstract	Recently, the tiger-cat species complex was split into Leopardus tigrinus and Leopardus guttulus, along with other proposed schemes. We performed a detailed analysis integrating ecological modeling, biogeography, and phenotype of the four originally recognized subspecies-tigrinus, oncilla, pardinoides, guttulus-and presented a new multidimensional niche depiction of the species. Species distribution models used > 1400 records from museums and photographs, all checked for species accuracy. Morphological data were obtained from institutional/personal archives. Spotting patterns were established by integrating museum and photographic/camera-trap records. Principal component analysis showed three clearly distinct groups, with the Central American specimens (oncilla) clustering entirely within those of the Andes, namely the pardinoides group of the cloud forests of the southern Central-American and Andean mountain chains (clouded tiger-cat); the tigrinus group of the savannas of the Guiana Shield and central/northeastern Brazil (savanna tiger-cat); and the guttulus group in the lowland forests of the Atlantic Forest domain (Atlantic Forest tiger-cat). This scheme is supported by recent genetic analyses. All species displayed different spotting patterns, with some significant differences in body measurements/proportions. The new distribution presented alarming reductions from the historic range of - 50.4% to - 68.2%. This multidimensional approach revealed a new species of the elusive and threatened tiger-cat complex.
MeSH term(s)	Animals ; Tigers ; Phylogeny ; Forests ; Brazil
Language	English
Publishing date	2024-01-29
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-024-52379-8
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Exergoeconomic analysis of a solar-powered/fuel assisted Rankine cycle for power generation

Cavalcanti, Eduardo J.C / Henrique Pereira Motta

Energy. 2015 Aug., v. 88

2015

Abstract: A Rankine System assisted for solar radiation and fuel combustion which produces 57 kW electrical power are evaluated from exergoeconomic point of view. The Parabolic trough collector efficiency has been performed to investigate its effect as heat source. ...

Abstract	A Rankine System assisted for solar radiation and fuel combustion which produces 57 kW electrical power are evaluated from exergoeconomic point of view. The Parabolic trough collector efficiency has been performed to investigate its effect as heat source. The exergoeconomic parameters as the relative cost difference and the exergoeconomic factor for each component are evaluated. The analysis is based on the SPECO (Specific Exergy Costing) approach. The simulation of system on March, June, September and December 21st from 7 am to 4 pm for Natal/Brazil using real data was carried out. The results reveal the daily average values of collector efficiencies, ratio of the useful solar energy, electricity produced, the specific cost per exergy unit of the produced electricity and others heat rates. The system is advantageous for higher solar radiation. The outcome of the analysis can be useful in design, optimization of operating parameters and help to take decision of investment.
Keywords	electric power ; electricity ; exergy ; fuel combustion ; heat ; power generation ; solar energy ; solar radiation ; Brazil
Language	English
Dates of publication	2015-08
Size	p. 555-562.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2019804-8
ISSN	0360-5442 ; 0360-5442
ISSN (online)	0360-5442
ISSN	0360-5442
DOI	10.1016/j.energy.2015.05.081
Database	NAL-Catalogue (AGRICOLA)

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Article: Structural insights and antioxidant analysis of a tri-methoxy chalcone with potential as a diesel-biodiesel blend additive

Moreira, Cauã A. / Faria, Eduardo C.M. / Queiroz, Jaqueline E. / Duarte, Vitor S. / Gomes, Marcelo do N. / da Silva, Aline M. / de Paula, Renata Layse G. / Franco, Chris H.J. / Cavalcanti, Eduardo H. de S. / de Aquino, Gilberto L.B. / Napolitano, Hamilton B.

Fuel processing technology. 2022 Mar., v. 227

2022

Abstract: The durability and stability of biofuels are ongoing problems in fuels research, particularly in the case of biodiesel and diesel-biodiesel blends. Problems such as poor oxidation stability and lower energy availability, which affect consumption, ... ...

Abstract	The durability and stability of biofuels are ongoing problems in fuels research, particularly in the case of biodiesel and diesel-biodiesel blends. Problems such as poor oxidation stability and lower energy availability, which affect consumption, emissions, and energy efficiency, limit the consolidation of these fuels in the global energy matrix. In this context, new technologies have been explored to minimize the negative points associated with the use of these fuels, such as additives, which are compounds that minimize these problems and generate better energy efficiency and emission levels. In the present work, an examination is presented of chalcones as a potential antioxidant additive to diesel-biodiesel blends. A comprehensive study with structural description, theoretical calculations, thermal analysis, and scale-up study, allied to the oxidation of a commercial additive with a tri-methoxy chalcone was performed to demonstrate the potential of this molecule.
Keywords	antioxidants ; biodiesel ; chalcone ; durability ; energy efficiency ; oxidation ; oxidative stability ; thermal analysis
Language	English
Dates of publication	2022-03
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1483666-x
ISSN	0378-3820
ISSN	0378-3820
DOI	10.1016/j.fuproc.2021.107122
Database	NAL-Catalogue (AGRICOLA)

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