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A phenomenological equation of exergy transfer, which indicates the relation between exergy flux, exergy resistance and exergy driving forces, is derived by applying non-equilibrium thermodynamics to second law analysis, and simultaneously the expressions of the coefficients of exergy transfer are obtained. The results show that exergy transfers in different forms interact on each other. This study...
This paper presents the energy and exergy analyses for a delayed coking unit in a Chinese refinery using the three-link energy structural model. According to the results of energy-use analysis and evaluation, the potentials of energy-use and improvements for energy-savings as well as detail procedures are suggested. The proposed improvements are expected to remarkably lower the energy consumption...
The control volume method has been widely used to describe the rate of exergy destruction due to process irreversibility in a laminar fluid flow stream. In this work, we demonstrate that when the approach is applied to turbulent flows, and the fluid properties are based on averaged values, some information may be lost. We have applied the Reynolds time average method to the set of equations of exergy...
Based on a three-link model, this paper presents a multi-objective retrofit optimization algorithm that simultaneously takes into account capacity expansions and uses of energy. This approach was successfully applied to retrofit an aromatic fractionation unit. Compared to the original system, the capacity of the retrofitted system increased by 28% and the energy consumption decreased by 81.4%. The...
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