Results 181 to 190 of about 3,406,342 (222)

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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Efficiency and Exergy Efficiency of a Heat Engine with the Maximum Power

Russian Journal of Physical Chemistry A, 2020
The exergy efficiency was evaluated based on the Alikhanov–Novikov maximum power principle. An expression for the efficiency of a heat engine related to the mechanism of heat transfer from the heat source to the generator was obtained. The exergy losses were compared for several industrial thermal power plants described in the literature.
L. I. Kheifets, V. L. Zelenko
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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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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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Impact of water depth on thermal efficiency, exergy efficiency, and exergy losses of finned acrylic solar still: an experimental study

Environmental Science and Pollution Research, 2021
This paper presents a complete exergy analysis and exergy destruction of a finned acrylic solar still (SS) at 1, 2, and 3 cm salt water depth (Wd). The coefficients of heat transfer of salt water-glass have been computed for evaporative, convective, and radiant heat transfer.
Mohammed El Hadi, Attia, Saravanan, Kaliyaperumal, Gunasekar, Thangamuthu, Ilango, Rengaraju, Suman, Mann, Santhakumar, Jayakumar, Suma Christal Mary, Sundararajan   +6 more
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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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Regional and global exergy and energy efficiencies

Energy, 1996
We 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 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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Exergy-Based Efficiency and Renewability Assessment of Biofuel Production

Environmental Science & Technology, 2005
This study presents an efficiency and renewability analysis of the production of three biofuels: rapeseed methyl ester (RME), soybean methyl ester (SME) and corn-based ethanol (EtOH). The overall production chains have been taken into account: not only the agricultural crop production and the industrial conversion into biofuel, but also production of ...
J, Dewulf, H, Van Langenhove, B, Van De Velde   +2 more
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Through exergy approach to more efficient processes

2000
This paper compares three different types of a turbine-converter-expander combination with respect to the exergetic efficiency. Converter stands for a combustion chamber, a Solid Oxide Fuel Cell and a reactor in which a chemical process is carried out. The exergy losses for the first examples are 22%. The exergy losses for the other two examples can be
PLOUMEN, P., JANSSEN, F.j.j.g.
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