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9.3.3 Maximum Energy Recovery
A design with no heat transfer across the pinch gives the maxi- mum recovery (MER) possible For a specified value of AT,,,, this term implies that the maximum energy of the hot streams is transferred to (recovered by) the cold streams so that the utility loads are minimized.
Since the number of heat exchangers required is always less than or equal to the number of heat exchangers in a maximum energy recovery (MER) network (Section it is convenient to develop initially a HEN charac- terized by maximum energy recovery for a specified value at the pinch and then modify the HEN design, if necessary, to increase its cost effective- ness.
MER Design.
The design of a HEN for maximum energy recovery should be considered in two parts: First, a network for the streams above the pinch is designed and then another for the streams below the pinch.
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