Results 181 to 190 of about 2,721 (226)

Exergy of partially coherent thermal radiation

Energy, 2012
Abstract Exergy of electromagnetic radiation has been studied by a number of researchers for well over four decades in order to estimate the maximum conversion efficiencies of thermal radiation. As these researchers primarily dealt with solar and blackbody radiation, which have a low degree of coherence, they did not consider the partial coherence ...
S. Wijewardane, Yogi Goswami
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Exergy concepts for thermal plant

International Journal of Heat and Fluid Flow, 1980
Abstract In this work the concepts applicable to a method of thermodynamic analysis known as exergy analysis are defined and discussed. Expressions are obtained for exergy components of a steady stream of matter and the relationship between the exergy of a steady stream of matter and that of a closed system is derived.
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Finite time generalization of thermal exergy

Energy Conversion and Management, 1998
Abstract An extended exergy allowing some inevitable dissipative properties (e.g. those occurring in boundary layers) can be formulated for finite rate transitions, which lead a system not in equilibrium with the environment (or “dead state”) to equilibrium with it in a finite time. This exergy is a function of the end states and the process duration
Stanislaw Sieniutycz, Michael R. von Spakovsky   +1 more
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Exergy in the Thermal Systems Analysis

1999
Exergy analysis has been developed as a result of application of the second law of thermodynamics to the investigation of the thermodynamic imperfection of industrial thermal processes. Precursors of exergy analysis were Gouy [1] and Stodola [7].
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Storage of Thermal Energy and Exergy

2017
This chapter refers to thermal energy storage (TES) systems based on fully mixed and stratified liquid storage tanks. The performance indicator adopted here is the minimum exergy destruction. All relevant irreversibility sources are considered. Every operation regime has an optimum charging time, which increases by decreasing the hot gas inlet ...
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Exergy conservation in parallel thermal insulation systems

International Journal of Heat and Mass Transfer, 1983
Abstract This paper is a Second-Law study of thermal insulation systems consisting of two 1-dim. insulations in parallel. It is shown that the parallel-insulation model applies to power and refrigeration systems exposed to large absolute temperature ratios.
W. Schultz, A. Bejan
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Fundamentals of Exergy Analysis and Exergy-Aided Thermal Systems Design

1999
A close reading of the early literature of the second law of thermodynamics originating from the time of Carnot shows that second law reasoning in today’s engineering sense - -optimal conversion of inputs to end use - - was present from the beginning. Interest in this theme occasionally flickered in the interim, but it was kept alive and now forms the ...
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The exergy of stratified thermal energy storages

Fuel and Energy Abstracts, 2001
The performance of energy and exergy analyses of TES systems incorporating thermal stratification are described, along with the resulting insights and benefits. Six temperature-distribution models for stratified TESs are considered (linear, stepped, continuous-linear, general-linear, basic three-zone and general three-zone) which facilitate the ...
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THERMAL STORAGE AND EXERGY ANALYSIS: THE IMPACT OF STRATIFICATION

Transactions of the Canadian Society for Mechanical Engineering, 1999
The importance and usefulness of second-law analysis for evaluating and comparing thermal energy storage (TES) systems in meaningful ways is discussed. Some of the main thermodynamic factors to be considered in evaluating TES performance are identified and described, including determining important analysis quantities, obtaining appropriate measures ...
M.A. Rosen, I. Dincer
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Exergy criteria of performance for thermal plant

International Journal of Heat and Fluid Flow, 1980
Abstract In this work the concept of exergy is used to define criteria of performance of thermal plant. Different criteria are defined for plants with useful outputs expressible in terms of exergy and those without. General methods for formulating criteria of performance for specific thermal plants are outlined and a number of examples of application
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