Exergy Analysis and Exergo-Economic Optimization of Industrial Processes

This study presents four analysis at unit 4 Kamojang geothermal power plant are exergy analysis at current condition, exergy efficiency optimization, economic optimization, and exergoeconomic optimization with wellhead valve pressure as a variable. Calculations are conducted by using the MATLAB. Thermodynamics characteristic of geothermal fluid assumed as water characteristic which get from REFPROP. Wellhead pressure operational condition 10 bar has exergy efficiency 31.91%. Exergy efficiency optimization has wellhead valve pressure 5.06 bar, exergy efficiency 47.3%, and system cost US$ 3,957,100. Economic optimization has well pressure 11 bar, exergy efficiency 22.13%, and system cost US$ 2,242,200. Exergoeconomic optimization has 15 optimum condition. Exergoeconomic optimization aims to analyze the optimum wellhead valve pressure for maximum exergy efficiency and minimum cost of power plant system.

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Hybrid Optimization Methodology (Exergy/Pinch) and Application on a Simple Process

Energies ◽

10.3390/en12173324 ◽

2019 ◽

Vol 12 (17) ◽

pp. 3324 ◽

Cited By ~ 1

Author(s):

Bou Malham ◽

Zoughaib ◽

Tinoco ◽

Schuhler

Keyword(s):

Process Design ◽

Exergy Analysis ◽

Operating Conditions ◽

Hybrid Optimization ◽

Industrial Processes ◽

Pinch Analysis ◽

Optimal Operating ◽

And Topology ◽

Optimization Methodology

In the light of the alarming impending energy scene, energy efficiency and exergy efficiency are unmistakably gathering momentum. Among efficient process design methodologies, literature suggests pinch analysis and exergy analysis as two powerful thermodynamic methods, each showing certain drawbacks, however. In this perspective, this article puts forward a methodology that couples pinch and exergy analysis in a way to surpass their individual limitations in the aim of generating optimal operating conditions and topology for industrial processes. Using new optimizing exergy‐based criteria, exergy analysis is used not only to assess the exergy but also to guide the potential improvements in industrial processes structure and operating conditions. And while pinch analysis considers only heat integration to satisfy existent needs, the proposed methodology allows including other forms of recoverable exergy and explores new synergy pathways through conversion systems. A simple case study is proposed to demonstrate the applicability and efficiency of the proposed method.

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Application of energy and exergy analysis to increase efficiency of a hot water gas fired boiler

Chemical Industry and Chemical Engineering Quarterly ◽

10.2298/ciceq130716033t ◽

2014 ◽

Vol 20 (4) ◽

pp. 511-521 ◽

Cited By ~ 6

Author(s):

Milena Todorovic ◽

Dragoljub Zivkovic ◽

Marko Mancic ◽

Gradimir Ilic

Keyword(s):

Exergy Analysis ◽

Energy Analysis ◽

Hot Water ◽

Engineering Practice ◽

Economic Optimization ◽

Energy And Exergy ◽

Energy And Exergy Analysis ◽

Reliable Solution ◽

Control Volumes ◽

Functional Components

In engineering practice exergy can be used for technical and economic optimization of energy conversion processes. The problem of increasing energy consumption suggests that heating plants, i.e. hot water boilers, as energy suppliers for household heating should be subjected to exergy and energy analysis. Heating plants are typically designed to meet energy demands, without the distinguished difference between quality and quantity of the produced heat. In this paper, the energy and exergy analysis of a gas fired hot water boiler is conducted. Energy analysis gives only quantitative results, while exergy analysis provides an insight into the actually available useful energy with respect to the system environment. In this paper, a hot water boiler was decomposed into control volumes with respect to its functional components. Energy and exergy of the created physical model of the hot water boiler is performed and destruction of exergy and energy loss in each of the components is calculated. The paper describes the current state of energy and exergy efficiency of the hot water boiler. The obtained results are analyzed and used to investigate possibilities for improvement of availability and reliability of the boiler. A comparison between the actual and the proposed more reliable solution is made.

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