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A simple and direct numerical technique is proposed to determine the optimal heat energy targets in heat pinch analysis. The technique is based on a geometrical approach, i.e., utilization of the horizontal shift between the cold composite curve (CC) and the stationary hot CC. The stream and target temperatures of the streams are a subset of an ordered set to form the overall temperature range . If the temperature subinterval in the overlap region of the CCs is equal to the minimum temperature differential T min , simple formulas that utilize the enthalpy flow values can be used to determine the corresponding horizontal shift (bias) B between the CCs. In the overlap range, Bs are determined at all points on one CC and other points on the other CC using T min to form the set . The maximum value of Bs in set , B\*, is used to determine the optimal heat energy targets. If the temperature subinterval in the overlap range is not equal to T min , the conventional temperature shift of the CCs is employed first and the resulting stream and target temperatures of the streams are set . In this case the same algebraic formulas are applicable. Heat pinch locations at end points or on a paralle

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Author

A.I.A. Salama

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0098-1354)

Published

2006

Language

EN

Field

Engineering (Physical Sciences)