scholarly journals Energy analysis of broiler chicken production system with darkhouse installation

2018 ◽  
Vol 22 (9) ◽  
pp. 648-652 ◽  
Author(s):  
Matheus C. Mattioli ◽  
Alessandro T. Campos ◽  
Tadayuki Yanagi Junior ◽  
Diego B. Marin ◽  
Tony M. C. Eugênio ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Production System ◽  
Energy Demand ◽  
Broiler Chicken ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Production Model ◽  
Production Cycle ◽  
Feed Water ◽  
Efficiency Coefficient

ABSTRACT The objective of this study was to evaluate the sustainability of a broiler chicken production system, with confinement in Darkhouse sheds, by energetic analysis. Energy flows of a complete production cycle, 56 days, were considered, of which the energy inputs and outputs were computed in direct and indirect forms, by estimating the energy coming from the quantity of feed, water, machinery and equipment, human labor, sheds, silos, among other components of the productive system, multiplied by their respective energetic coefficients. The total energy demand of a system in a production cycle for the production of 1 kg of live chicken and its energy efficiency coefficient were determined. The studied system had energy conversion coefficient of 95%, demonstrating that the production model has high energy conversion efficiency and fits a sustainable model. On average, 37.55 MJ kg-1 of live chicken were necessary. The main limiting point of the system corresponded to the energy consumed in the form of feed, with 75% of the total direct energy.

Current progress and performance improvement of Pt/C catalysts for fuel cells

2020 ◽  
Vol 8 (46) ◽  
pp. 24284-24306
Author(s):  
Xuefeng Ren ◽  
Yiran Wang ◽  
Anmin Liu ◽  
Zhihong Zhang ◽  
Qianyuan Lv ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Energy Conversion ◽  
Performance Improvement ◽  
Electric Energy ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Carnot Cycle ◽  
High Energy Conversion Efficiency ◽  
And Performance

Fuel cell is an electrochemical device, which can directly convert the chemical energy of fuel into electric energy, without heat process, not limited by Carnot cycle, high energy conversion efficiency, no noise and pollution.

Direct-Write Piezoelectric Polymeric Nanogenerator with High Energy Conversion Efficiency

Nano Letters ◽  
2010 ◽  
Vol 10 (2) ◽  
pp. 726-731 ◽  
Author(s):  
Chieh Chang ◽  
Van H. Tran ◽  
Junbo Wang ◽  
Yiin-Kuen Fuh ◽  
Liwei Lin
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Direct Write ◽  
High Energy Conversion Efficiency

scholarly journals Anomalous Thermo-osmotic Conversion Performance of Ionic Covalent-Organic-Framework Membranes in Response to Charge Variations

2022 ◽  
Author(s):  
Qi Sun ◽  
Weipeng Xian ◽  
Xiuhui Zuo ◽  
Changjia Zhu ◽  
Qing Guo ◽  
...  
Keyword(s):  
Charge Density ◽  
Energy Conversion ◽  
Energy Demand ◽  
High Performance ◽  
Critical Factor ◽  
Energy Conversion Efficiency ◽  
Nanoporous Membranes ◽  
Power Extraction ◽  
Membrane Charge ◽  
Salinity Difference

Abstract The development of efficient thermo-osmotic energy conversion devices has fascinated scientists and engineers for several decades in terms of satisfying the growing energy demand. The fabrication of ionic membranes with a high charge population is known to be a critical factor in the design of high-performance power generators for achieving high permselectivity and, consequently, high power extraction efficiency. Herein, we experimentally demonstrated that the thermo-osmotic energy conversion efficiency was improved by increasing the membrane charge density; however, this enhancement occurred only within a narrow window and subsequently exhibited a plateau over a threshold density. The complex interplay between pore−pore interactions and fluid structuration for ion transport across the upscaled nanoporous membranes helped explain the obtained results with the aid of numerical simulations. Consequently, the power generation efficiency of the multipore membrane deteriorated, deviating considerably from the case of simple linear extrapolation of the behavior of the single-pore counterparts. A plateau in the output electric power was observed at a moderate charge density, affording a value of 210 W m−2 at a 50-fold salinity difference with a temperature gradient of 40 K. This study has far-reaching implications for discerning an optimal range of membrane charge populations for augmenting the energy extraction, rather than intuitively focusing on achieving high densities.

scholarly journals Exploring harnessing wind power in moving reference frames with application to vehicles

2019 ◽  
Vol 11 (9) ◽  
pp. 168781401986568
Author(s):  
Oleg Goushcha ◽  
Robert Felicissimo ◽  
Amir H Danesh-Yazdi ◽  
Yiannis Andreopoulos
Keyword(s):  
Energy Conversion ◽  
Wind Power ◽  
Conversion Efficiency ◽  
Reference Frames ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
High Mass ◽  
Specific Power ◽  
Moving Frames ◽  
Atmospheric Conditions

The possibility of extracting wind power from unique configurations embedded in moving vehicles using microturbine devices has been investigated. In such environments with moving frames or platforms, powered either by humans like bicycles or by chemical reactions like automobiles, the specific power of the air motion is much greater and less intermittent than in stationary wind turbines anchored to the ground in open atmospheric conditions. In a translational frame of reference, the rate of work done by the drag force acting on the wind harnessing device due to the relative motion of air should be taken into account in the overall performance evaluation through an energy balance. A device with a venting tube has been tested that connects a high-pressure stagnating flow region in the front of the vehicle with a low-pressure region at its rear. Our analysis identified two key areas to focus on for potentially significant rewards: (1) vehicles with high energy conversion efficiency, which require a high mass flow rate through the venting duct, and (2) vehicles with low energy conversion efficiency with wakes, which will be globally affected by the introduction of the venting duct device in a manner that reduces their drag so that there is a net gain in power generation.

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