New Approach for Design and Optimization of Refrigeration Systems
Volume Title: 1
Authors
1School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
2Associate Professor, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
3Professor, Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
4Assistant Professor, Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
Abstract
In this study, a new approach for design and optimization of refrigeration systems was developed using both Combined Pinch and Exergy Analysis (CPEA) technique and mathematical programming. In this regard, new diagrams of Omega Composite Curves (OCC) and Omega Grand Composite Curve (OGCC) were applied for thermal exergy analysis of heat exchanger network. Also, Ω-H diagram was used to compute all the thermal, mechanical, and chemical exergy losses within the process. As a result, using OCC, OGCC and Ω–H diagrams, the exergy losses of all unit operations in processes was calculated. Then, the diagrams were combined with mathematical programming to propose a new systematic procedure for design and optimization of sub-ambient processes. A case study of natural gas liquefaction process was used to demonstrate the application of the proposed procedure. In this case study optimization of the LNG process resulted in 24.9% lower shaft work consumption.
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