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Energy and Exergy Efficiencies
2012Energy and exergy efficiencies are considered to be useful for the assessment of energy conversion systems and for improved performance. By considering both of these efficiencies, the quality and quantity of the energy used to achieve a given objective is properly accounted for, and the degree to which efficient and effective use of energy resources is
Mehmet Kanoğlu +2 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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Efficiency and Exergy Efficiency of a Heat Engine with the Maximum Power
Russian Journal of Physical Chemistry A, 2020The 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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Comparing hydraulic and polytropic efficiencies with exergy efficiency
Exergy, An International Journal, 2001Abstract 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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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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Energy efficiency, no: It's exergy efficiency!
International Journal of Hydrogen Energy, 2007Elevated 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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A more general exergy function and its application to the definition of exergy efficiency
Energy, 2015Abstract An availability function which includes the usual functions exergy and flow exergy as special cases is defined and called exergy. The new definition of exergy is based on the concept of pressure energy, namely the work that must be done on a stationary external pressure field to build inside it the region of space occupied by the system ...
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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 +6 more
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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 +6 more
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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-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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