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Primary exergy efficiency—Effect of system efficiency environment to benefits of exergy savings
Energy and Buildings, 2016Abstract Improving energetic performance is a key factor in making societies more sustainable. One way to analyze energetic performance is to use methods based on the second law of thermodynamics. Exergy analysis is such a method. With exergy analysis thermodynamic losses of the studied system can be found.
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Efficiencies of exergy transductions
Applied Energy, 1980Abstract Exergy is conserved in thermodynamically reversible heat engines and heat pumps. Using a reversible heat engine to stimulate a reversible heat pump, available power and exergy may be exchanged, the total amount of exergy being conserved. For such a combined system, either more heat may be released at a lower temperature or energy may be ...
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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
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Exergy efficiency and conversion of chemical reactions
Energy Conversion and Management, 1998An 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 ...
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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 ...
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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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