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A free piece of educational software for heat exchanger network design based on the pinch method is presented.
The efficiencies obtained with the operating line method are higher than those calculated with the pinch method, when both are applied to a dominant power load case.
The first one is the pinch method (Townsend and Linnhoff, 1983,A.I.Ch.E. J.29, 742 771) which is based on the pinch properties.
Two novel thermodynamically sound shortcut methods, the feed pinch method (FPM) and the feed angle method (FAM), are proposed to resolve the limitations of existing methods.
For energy integration analysis, the pinch method was used to evaluate the best heat and power integration options of available heat generated in the process.
The pinch method is able to calculate the amount of thermal energy that can be interchanged between different internal process streams (=integrated heat) without the need of providing external heating or cooling media.
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"We teach all forms of hand-building -- slab, coil, pinch methods -- wheel work and clay sculpture in depth," he said.
Pinch methods account for conceptual principles driven by an overall understanding of the problem.
In the water pinch approach, similar to heat pinch methods, the total range of contaminant concentration in the data is divided into intervals.
The pre-benchmarking characterizes the current energy efficiency of the process by three techniques: energy and exergy content indicators, comparison to the current industrial practice and establishing targets for minimum energy and water requirements determined by the Thermal Pinch and Water Pinch methods.
Hence, for optimization of shaft work, an exergy-pinch method should be used.
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