The Heat Recovery Pinch and Its Significance

Figure 16-16a shows composite curves for a multi-stream problem, which is noted at the pinch. As illustrated earlier, the correct setting for the composite curves is determined by an economic minimum temperature difference ΔTmin between the curves. If the correct economic ΔTmin is known, this fixes the relative position of the composite curves and hence the energy target. The ΔTmin for the composite curves and its location have important implications for the design if the energy target is to be achieved in the design of a heat exchanger network. The ΔTmin is normally observed at only one point between the hot and cold composite curves, which is referred to as the heat recovery pinch.
The trade-off between ...

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