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Entropy, Volume 7, Issue 3 (September 2005), Pages 172-198

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Editorial

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Open AccessEditorial The FIS2005 Conference in Paris
Entropy 2005, 7(3), 188-189; doi:10.3390/e7030188
Received: 15 July 2005 / Accepted: 19 July 2005 / Published: 19 July 2005
Cited by 1 | PDF Full-text (67 KB)

Research

Jump to: Editorial

Open AccessArticle Exergy Analysis and Second Law Efficiency of a Regenerative Brayton Cycle with Isothermal Heat Addition
Entropy 2005, 7(3), 172-187; doi:10.3390/e7030172
Received: 6 June 2005 / Accepted: 3 July 2005 / Published: 5 July 2005
Cited by 10 | PDF Full-text (134 KB)
Abstract
The effect of two heat additions, rather than one, in a gas turbine engine is analyzed from the second law of thermodynamics point of view. A regenerative Brayton cycle model is used for this study, and compared with other models of Brayton [...] Read more.
The effect of two heat additions, rather than one, in a gas turbine engine is analyzed from the second law of thermodynamics point of view. A regenerative Brayton cycle model is used for this study, and compared with other models of Brayton cycle. All fluid friction losses in the compressor and turbine are quantified by an isentropic efficiency term. The effect of pressure ratio, turbine inlet temperature, ambient temperature, altitude, and altitude with variable ambient temperature on irreversibility "exergy destroyed" and second law efficiency was investigated and compared for all models. The results are given graphically with the appropriate discussion and conclusion. Full article
Open AccessArticle Entropy, Fluctuation Magnified and Internal Interactions
Entropy 2005, 7(3), 190-198; doi:10.3390/e7030190
Received: 22 November 2004 / Accepted: 20 May 2005 / Published: 28 August 2005
Cited by 8 | PDF Full-text (69 KB)
Abstract
Since fluctuations can be magnified due to internal interactions under a certain condition, the equal-probability does not hold. The entropy would be defined as S(t)=-k Σr Pr(t) ln Pr(t). From this or S=k ln Ω in [...] Read more.
Since fluctuations can be magnified due to internal interactions under a certain condition, the equal-probability does not hold. The entropy would be defined as S(t)=-k Σr Pr(t) ln Pr(t). From this or S=k ln Ω in an internal condensed process, possible decrease of entropy is calculated. Internal interactions, which bring about inapplicability of the statistical independence, cause possibly decreases of entropy in an isolated system. This possibility is researched for attractive process, internal energy, system entropy and nonlinear interactions, etc. An isolated system may form a self-organized structure probably. Full article

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