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Heat Transfer Research
Fator do impacto: 0.404 FI de cinco anos: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018021203
pages 1-16

ANALYSES OF ENTRANSY DISSIPATION RATIO AND ENTROPY GENERATION RATIO FOR GAS POWER CYCLES UNDER VARIOUS CONDITIONS: EDEG SOFTWARE

Ankur Geete
Mechanical Engineering Department, Sushila Devi Bansal College of Technology, Indore, Madhya Pradesh, 453331, India

RESUMO

Gas power plants are based on a gas power cycle with two constant pressure processes and two isentropic processes. In this paper, a thermodynamic analysis of a gas power plant is made. Entransy dissipation analysis and entropy generation analysis are made under various operating conditions, that is: at different specific heats of fluids, different numbers of transfer units, and different isentropic efficiencies for the turbine and compressor. In this work, the entransy dissipation-entropy generation (EDEG) software has been developed which is used to analyze the effectiveness, entransy dissipation, entropy generation, entransy dissipation ratio, and entropy generation ratio for the cycle under different operating conditions. The EDEG software is also used to generate different performance characteristic curves of various parameters. These curves help to identify that optimum conditions at which both entropy generation and entransy dissipation are minimum. The conclusions of this research work are: (a) when Cp is 0.5 kJ/kg K, the effectiveness for hot and cold fluids is maximum and equal to 0.973 and 0.970, respectively, and the entransy dissipation ratio is 1.836 which is also maximum; (b) when Ch and Cc are 5.0 and 4.0 kJ/kg K, respectively, the effectiveness for hot and cold fluids is maximum and equal to 0.967 and 0.962, respectively, but EGr and EDr are minimum — 0.84 and 0.961, respectively; (c) when NTUs for hot and cold fluids are 5, the effectiveness for hot and cold fluids is maximum and equal to 0.982 and 0.976, respectively, and (d) when ηcom and ηtur are 75% and 85%, respectively, the EGr and EDr are maximum and equal to 1.217 and 1.817, respectively.


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