Energy targeting composite curves

Figure 6.7 The composite curves set the energy target and the location of the pinch.

In other words, to achieve the energy target set by the composite curves, the designer must not transfer heat across the pinch by... 

This shifting technique can be used to develop a strategy to calculate the energy targets without having to construct composite curves ... 

Although the composite curves can be used to set energy targets, they are not a suitable tool for the selection of utilities. The grand composite curve is a more appropriate tool for understanding the interface between the process and the utility system. It is also, as is shown in later chapters, a useful tool for study of the interaction between heat-integrated reactors and separators and the rest of the process. 

Figure 14.9 The composite curves after process modifications shows a much reduced energy target. (From Smith and Linnhoff, Trans. IChemE, ChERD, 66 195, 1988 reproduced by permission of the Institution of Chemical Engineers )...

Having decided that no exchanger should have a temperature difference smaller than ATmi, two rules were deduced. If the energy target set by the composite curves (or the problem table algorithm) is to be achieved, there must be no heat transfer across the pinch by... 

Pinch analysis exploits thermodynamics to allow energy systems to be targeted. These targets allow scoping and screening of different options. Composite curves can be used to provide insights into where... 

Several software including Aspen HxNet and Honeywell UniSim ExchangerNet can be applied to build composite curves and conduct energy targeting and total cost targeting to determine ATmir apt. 

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