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| Registros recuperados: 35 | |
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| Aliasgarian, Saeed. |
| Conservation tillage due to some properties such as reduction in time and energy required for seedbed preparation is going to be an unavoidable choice in region with arid and semiarid climate. This research was conducted at Murchehkhort farms, central region of Iran to energetic, economics and environmental evaluation of different tillage systems. The study was planned as a completely randomized block design with three tillage treatments replicated three times. The tillage treatments were: no-tillage (NT): direct drilling, reduced tillage (RT): chisel plow and roller packing as a combined machine followed by a light disking and drilling; and Conventional tillage (CT): moldboard plow followed by two heavy harrow diskings and drilling. NT Compared to CT and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: No-tillage; Reduced tillage; Energy efficiency; Gross margin; Herbicide. |
| Ano: 2017 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4049 |
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| Ebrahimi, Sajjad; Mesri Gundoshmian, Tarahom; Abdi, Reza; Raei Jadidi, Mehri. |
| The goal of this study was to evaluate the sustainability and efficiency of broiler production with regard to energy consumption in Ardabil province, Iran. To reach the goal, linear programming model and Data Envelopment Analysis (DEA) were employed. Data were collected from the farmers using a face–to–face questionnaire performed in September–December 2014 period. The DEA application results showed that the average values of technical, pure technical and scale efficiency scores of producers were 0.949, 0.988 and 0.960, respectively. Also, energy saving target ratio for broiler production was calculated as 8.33%, indicating that by following the recommendations resulted from this study, about 12316.85 MJ/(1000 bird) of total input energy could be saved... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy efficiency; Data Envelopment Analysis; Linear programming; Technical efficiency; Broiler. |
| Ano: 2016 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3562 |
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| Santos, Otávio Neto Almeida; Folegatti, Marcos Vinícius; Lena, Bruno Patias; Diotto, Adriano Valentim; Francisco, João Paulo; Romanelli, Thiago Libório. |
| Jatropha (Jatropha curcas L.) is an oil seed species, adaptive to different climate and soil conditions. It is known due to its high-oil-content seed, being an option for biodiesel production and presenting competitive yields under irrigated condition. This study was developed in an experimental area located in a humid subtropical region of Brazil and the objective was to evaluate Jatropha’s energy balance under irrigation and rainfed condition during the first four years of its cycle. First, the material flows were determined, which supported the calculation of, energy input and output flows were obtained. These were used to determine the energy indices: energy balance (EB), and energy return on investment (EROI) for both conditions. Fertilizers had the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biofuel; Energy efficiency; Sustainability; Energy flow. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4597 |
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| Pradella,Angela Morandini; Loures,Eduardo de Freitas Rocha; Costa,Sergio E. Gouvea da; Lima,Edson Pinheiro de. |
| Abstract Governments and private companies have increased efforts to identify effective actions for improving energy efficiency in manufacturing processes. The objective of this work is to improve the decision-making process by increasing the quality of information related to energy indicators in the food industry. This research involves developing a systematic literature review (SLR) to identify energy efficiency indicators in the food industry, which serve as inputs for a sectoral evaluation based on multicriteria techniques. The SLR identified six criteria evaluated by food industry experts, which form the proposed basis for evaluating the performance of related sectors. These criteria are: benchmarks, key performance indicators, framework, monitoring,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy efficiency; Manufacture; Food industries; Analytic hierarchy process (AHP); Preference ranking organization method for enrichment evaluations (PROMETHEE). |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000200301 |
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| Volpato,Carlos Eduardo Silva; Conde,Alexon do Prado; Barbosa,Jackson Antonio; Salvador,Nilson. |
| Biodiesel is a renewable fuel derived from vegetable oils used in diesel engines, in any proportion with petroleum diesel, or pure. It is produced by chemical processes, usually by transesterification, in which the glycerin is removed. The objective of this study was to compare the performance of a four stroke, four cylinder diesel cycle engines using either olive (B100) biodiesel oil or diesel oil. The following parameters were analyzed: effective and reduced power, torque, specific and hourly fuel consumption, thermo-mechanical and volumetric efficiency. Analysis of variance was performed on a completely randomized design with treatments in factorial and the Tukey test applied at the level of 5%. Five rotation speeds were researched in four replications... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alternative fuel; Energy efficiency; Combustion engine. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000300011 |
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| BEIGI,Mohsen. |
| Abstract The present study aimed at investigating the influences of drying air temperature and flow rate on energy parameters and dehydration behaviour of apple slices. For this purpose, apple slices were dried in a convective dryer at air temperatures of 50, 60 and 70 °C, and air velocities of 1, 1.5 and 2 m s–1. Dehydration rate increased as the air temperature and flow rate increased from 50 to 70 °C and 1 to 2 m s–1, respectively. The effective moisture diffusivity was determined to be in the range of 6.75×10–10-1.28×10–9 m2 s–1. Results of data analysis showed that the maximum energy consumption (23.94 kW h) belonged to 50 °C and 2 m s–1 and the minimum (13.89 kW h) belonged to 70 °C and 1 m s–1 treatment. Energy efficiency values were in the range of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apple; Moisture diffusion; Thermodynamic parameters; Energy efficiency. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612016000100145 |
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| Ferreira,Tomás de Aquino; Ferreira,Sílvia Costa; Barbosa,Jackson Antônio; Volpato,Carlos Eduardo Silva; Ferreira,Rute Costa; Silva,Marielle Jordane da; Barbosa,Leonardo Maia. |
| ABSTRACT: The aim of the present study is to evaluate the energy balance and energy efficiency of the silage maize crop in the Center for Research, Development and Technology Transfer of the Universidade Federal de Lavras (CDTT-UFLA). The crop was irrigated by center pivot and the stages of maize cultivation and energy inputs were monitored for the 1st and 2nd crops of the 2014/2015 harvest. Results from the energy analysis showed the crop had a total energy input of 45,643.85 MJ ha-1 and 47,303.60 MJ ha-1 for the 1st and 2nd crops and a significant predominance of direct energy type (about 92% of the matrix). Regarding direct energy inputs, the diesel oil was the most representative, contributing with approximately 38% of the total energy demand.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy efficiency; Energy in agriculture; Center pivot; Sustainability. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000500351 |
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| Köpp,Luciana Marini; Peiter,Marcia Xavier; Robaina,Adroaldo Dias; Girardi,Leonita Beatriz. |
| ABSTRACT: Performance indices can be used as indices of energy use in irrigation systems. Pumping stations (PSs) are elements that require energy for irrigation of rice fields by conventional flood irrigation. Interplay of physical, hydraulic, and electrical parameters generates indices that determine the performance in the diagnosis of PSs, operation, and projects for new sets. In this study, it was proposed and classified performance indices for PSs in rice fields, focusing on the efficient use of energy. The study was carried out through an investigation of 160 PSs in operation, located at the western border of Rio Grande do Sul, Brazil, which constituted an actual field situation. Next, PSs were optimized in relation to the selection of a piping... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy efficiency; Irrigation flooding; Pumping systems; Irrigation performance.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000801384 |
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| Moss, Timothy; Leibniz Institute for Regional Development and Structural Planning, Erkner; MossT@irs-net.de; Griefahn, Barbara; Leibniz Research Centre for Working Environment and Human Factors, Dortmund;; Kloas, Werner; Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin;; Voigt, Christian C.; Leibniz Institute for Zoo and Wildlife Research, Berlin;; Schwope, Axel; Astrophysikalisches Institut Potsdam;; Franke, Steffen ; Leibniz Institute for Plasma Science and Technology, Greifswald;; Uhrlandt, Dirk ; Leibniz Institute for Plasma Science and Technology, Greifswald;; Klenke, Reinhard; Helmholtz Centre for Environmental Research, UFZ, Leipzig ;; Wolter, Christian; Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin; wolter@igb-berlin.de. |
| Although the invention and widespread use of artificial light is clearly one of the most important human technological advances, the transformation of nightscapes is increasingly recognized as having adverse effects. Night lighting may have serious physiological consequences for humans, ecological and evolutionary implications for animal and plant populations, and may reshape entire ecosystems. However, knowledge on the adverse effects of light pollution is vague. In response to climate change and energy shortages, many countries, regions, and communities are developing new lighting programs and concepts with a strong focus on energy efficiency and greenhouse gas emissions. Given the dramatic increase in artificial light at night (0 - 20% per year,... |
| Tipo: Peer-Reviewed article |
Palavras-chave: Artificial light; Energy efficiency; Lighting concept; Light pollution; Nightscape; Policy; Sustainability; Transdisciplinary. |
| Ano: 2010 |
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| SOUZA,SAMUEL N. M. DE; LENZ,ANDERSON M.; WERNCKE,IVAN; NOGUEIRA,CARLOS E. C.; ANTONELLI,JHONATAS; SOUZA,JULIANO DE. |
| ABSTRACT In Brazil there is a wide availability of residues, which have been used in the production of biogas and biofertilizers. The engine-generator by biogas is grid connected, and produce electricity for self-consumption and the surplus is inserted into the grid. The aim of the present study was to evaluate energetic efficiency and exhaust gas emission of two cases: two engine-generators sets of 100 kVA running on biogas, produced from residues of a poultry slaughterhouse unit (PSU) and swine fattening unit (SFU). Load variation in the engine-generator set was evaluated in the SMCP (system of protection and synchronism). There was an increase in the emission of nitrogen oxide, sulfur dioxide and exhaust gas temperature, in both cases. The elevation in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biofuel; Energy efficiency; Organic waste; Gas emission. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400613 |
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| Pereira,Priscilla A.; Yanagi Junior,Tadayuki; Silva,Joaquim P. da; Lima,Renato R. de; Campos,Alessandro T.; Abreu,Lucas H. P. |
| The spatial distribution of illuminance and the electric consumption of artificial lighting system is one of the main problems related to broiler production. Therefore, the aim of this study was to evaluate the spatial distribution of luminance level and energy efficiency of different lighting systems for broiler houses. Six types of lamps were tested in two different configurations to find the minimum illuminance of 20 and 5 lux. The tested lamps were incandescent (IL) 100 W, compact fluorescent (CFL) 34 W, mixed (ML) 160 W, sodium vapor (SVL) 70 W, T8 fluorescent tube (T8 FTL) 40 W and T5 fluorescent tube (T5 FTL) 28 W. The first four were evaluated with and without reflective light fixture and the latter two without light fixture. It was observed that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Artificial lighting; Spatial variability; Energy efficiency; Aviculture. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600002 |
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| Celuppi,Rafael; Scapinello,Jaqueline; Andrade,Felipe G. D.; Revello,Jaime H. P.; Magro,Jacir Dal. |
| Energy consumption in the world has been growing every year. The industrial sector represents 27.32% of the world energy demand. Heating systems that use solar energy may contribute with a percentage of the total energy required by industries. This work aimed to study the use of vacuum solar collectors for water pre-heating in boilers. We used four collectors installed according to NBR 15,569; water flow through the tubes was 0.058 L/s, and temperature in the inlet and outlet pipes was measured. Results showed that instantaneous radiation, and inlet fluid and room temperatures are variables that influence the process, reaching water maximum temperature in the solar collector outlet of 97.9 °C, and efficiency of approximately 65% for most experiments. For... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar collector; Water heating; Energy efficiency. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300009 |
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| Registros recuperados: 35 | |
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