Results 241 to 250 of about 4,653,935 (318)

Exergy efficiency and conversion of chemical reactions

Energy Conversion and Management, 1998
An exergy analysis of the ammonia oxidation in nitrous oxide has been performed using alternatively the conventional second law efficiency and the more recently proposed intrinsic exergy efficiency. It is shown that the second law efficiency does not account for the conversion effect on the overall performance of a chemical system while the intrinsic ...
M. Sorin, J.-C. Bonhivers, J. Paris
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Comparing hydraulic and polytropic efficiencies with exergy efficiency

Exergy, An International Journal, 2001
Abstract This paper uses the hydraulic and polytropic efficiency concepts in a domain wider than that of their original definition. A generalized Bernoulli equation taken from previous papers is also considered. The aim is to find a general statement yielding hydraulic efficiency values ranging from one to zero, and a relative dissipative term ...
Giacomo Bisio, Giuseppe Rubatto
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Energy efficiency, no: It's exergy efficiency!

International Journal of Hydrogen Energy, 2007
Elevated energy efficiencies seem politically beyond dispute as measures against anthropogenic climate change. Energy efficiencies, however elevated they become, remain within the applied energy system, though. The paper draws attention to the exergo-thermodynamical system change of splitting up energy into exergy and anergy where exergy is the maximum
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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, 2010
In 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, S Farahat, H Ajam, A Behzadmehr   +3 more
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Exergy cascade release pathways and exergy efficiency analysis for typical indirect coal combustion processes

Combustion theory and modelling, 2019
Indirect coal combustion can solve some problems such as low efficiency and air pollution during traditional coal combustion, this research investigates energy release characteristics of indirect combustion and aims to achieve maximum energy utilisation.
Qiuhui Yan, Tiantian Lu, Jieren Luo, Yanwan Hou, Xiaohong Nan   +4 more
semanticscholar   +1 more source

Exergy-efficient management of energy districts

Proceeding of the 11th World Congress on Intelligent Control and Automation, 2014
Sustainable 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, Yan, Bing, Luh, Peter B., Bragin, Mikhail A., BIANCO, NICOLA, Graditi, Giorgio, Mongibello, Luigi, Naso, Vincenzo   +7 more
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Energy and exergy efficiencies for society

Journal of the Energy Institute, 2008
AbstractExergy 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, 2011
Efficiency 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, Laura, Talens Peiró, Gara, Villalba Méndez   +2 more
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Eco-efficiency of control configurations using Exergy

Proceedings of 2012 UKACC International Conference on Control, 2012
For 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, 2000
Exergy 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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