123--Design without a Pinch and with Multiple Pinches

doi:10.1615/hedhme.a.000123

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Introduction It's an article capital costs in, cogeneration in, composite curves design methods in,

The Pinch Design Method It's an article pinches,

Design without a Pinch and with Multiple Pinches It's an article

problem table algorithm in, without pinch or with multiple pinches,

heat pumping in, maximum energy recovery, pinch principle, utility selection in,

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Index

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A B C D E F G H I J K L M N O P

Introduction It's an article capital costs in, cogeneration in, composite curves design methods in,

The Pinch Design Method It's an article pinches,

Design without a Pinch and with Multiple Pinches It's an article

problem table algorithm in, without pinch or with multiple pinches,

heat pumping in, maximum energy recovery, pinch principle, utility selection in,

Q R S T U V W X Y Z

P Pinch analysis, for heat exchanger network design, design methods in, pinches,

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Design without a Pinch and with Multiple Pinches

DOI 10.1615/hedhme.a.000123

1.7.4 Design Without a Pinch and With Multiple Pinches

B. Linnhoff, R. Smith

A. Introduction

So far only problems with on Pinch and two utilities (one hot, one cold) have been considered. We shall now look at problems with no Pinches or several Pinches, and with more than two utilities.

B. Problems without a Pinch

Consider the Composite Curves in Figure 1a. They are set for ΔT_min = 20 K. As ΔT_min is reduced, utilities decrease as expected. However, when ΔT_min = 14 K is reached, the curves line up at the hot end and the process no longer needs utility, Figure 1b.

In Figure 1c ΔT_min below 14 K no longer saves utilities. Instead, cold utility is simply switched from one end of the problem to the other.

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