Results 181 to 190 of about 32,285 (228)
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Exergy efficiency of a solar photovoltaic array based on exergy destructions
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2010In this article, an attempt has been made to investigate the exergetic performance of a solar photovoltaic (PV) array. A detailed energy and exergy analysis has been carried out to calculate the operating and electrical parameters, exergy destruction components, and exergy efficiency of a typical PV array.
F Sarhaddi +3 more
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Exergy-efficient management of energy districts
Proceeding of the 11th World Congress on Intelligent Control and Automation, 2014Sustainable development requires not only the use of sustainable energy resources, but also the efficient use of all energy resources. The latter should be reached by considering the concept of energy as well as exergy - the true magnitude of thermodynamic losses.
DI SOMMA, MARIALAURA +7 more
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Energy and exergy efficiencies for society
Journal of the Energy Institute, 2008AbstractExergy is defined as the maximum amount of work and exergy concept gives an effective way by using the conservation of energy principle. This concept is used to evaluate energy use of societies. In this respect, energy and exergy efficiencies are defined to evaluate sector efficiencies in societies.
Ü. Çamdali, M. Tunç
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Exergy Efficiency in Industry: Where Do We Stand?
Environmental Science & Technology, 2011Efficiency is a term generally used to determine how well a system performs. However, efficiency can have different meanings and, unaccompanied by a formal definition or taken out of context, can lead to serious misconceptions. In many official publications, efficiency is calculated as the ratio of useful output to energy input.
Robert U, Ayres +2 more
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Eco-efficiency of control configurations using Exergy
Proceedings of 2012 UKACC International Conference on Control, 2012For general multi-input multi-output (MIMO) processes, thermodynamic properties like exergy have been previously used for the development of eco-efficiency analysis tools e.g. Relative Exergy Array (REA) [1, 2], and Exergy Eco-efficiency Factor (EEF) [3]. The REA is easy to use, compares several control scheme candidates for single units and ranks them
M. T. Munir, W. Yu, B. R. Young
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On Intrinsic Exergy Efficiency and Heat Pumps
Chemical Engineering Research and Design, 2000Exergy analysis provides an assessment of the degree of thermodynamic perfection of a process. Several exergy efficiency definitions have been proposed among which is the intrinsic efficiency which is based on the concept of transiting exergy. This method of analysis has been applied to absorption heat pumps and the results are presented.
J. Labidi, E. Boulet, J. Paris
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Regional and global exergy and energy efficiencies
Energy, 1996We present estimates of global energy efficiency by applying second-law (exergy) analysis to regional and global energy balances. We use a uniform analysis of national and regional energy balances and aggregate these balances first for three main economic regions and subsequently into world totals. The procedure involves assessment of energy and exergy
Nakicenovic, N., Gilli, P.V., Kurz, R.
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Exergy efficiency graphs for thermal power plants
Energy, 2015Despite the strong support for exergy in thermodynamics, the industry still relies on energy based power plant efficiencies. The paper exposes errors with energy based efficiencies and improves the graphical representation of plants efficiencies. Among others, energy efficiencies cannot recognised that Combined Heat and Power (CHP) plant may be less ...
J. Taillon, R.E. Blanchard
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Efficient cryogenic nitrogen generators: An exergy analysis
Gas Separation & Purification, 1991Abstract Through exergy analysis, inefficiencies were identified in the distillation system for an efficient cryogenic air separation plant producing large-tonnage quantities of nitrogen. Both exergy losses and carefully chosen exergy efficiencies were used for analysing this process.
R. Agrawal, D.W. Woodward
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Exergy efficiency calculation of energy intensive systems
Exergy, An International Journal, 2002Abstract An innovative method for the exergy efficiency calculation of a complex energy-intensive system with arbitrary structures is described in this paper. The method is based on a novel general equation to calculate the total system exergy efficiency, and on an exergy flow graph proposed by the authors.
V. Nikulshin, C. Wu, V. Nikulshina
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