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Synthesis of heat exchanger networks with minimum number of units for pinched problems

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Abstract

An algorithmic-evolutionary synthesis procedure is studied for generating the maximum energy recovery (MER) and minimum number of units (MNU) networks with the goal of achieving the global optimum network under pinch points. For pinched problems, sufficient conditions are proposed for determining the minimum number of units. These sufficient conditions, together with heuristic matching rules, are used to generate an initial feasible composite MNU/MER network. A split-merge network structure is introduced in order not to violate the prescribed minimum approach temperature. This initial network is successively evolved to obtain improved networks by limited heat load redistribution resulting from the pinch point. The properties and limitations of the constructions and procedures are established and the effectiveness of the heuristic procedure is illustrated with literature test problems.

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Abbreviations

AP:

sub-problem above the pinch point

BP:

sub-problem below the pinch point

c:

heat capacity flow rate [kW/°C]

C:

cooling requirement [kW]

H:

heating requirement [kW]

HC:

heat content of stream [kW]

N:

number of streams

n:

number of streams

Q:

amount of heat exchanged [kW]

S:

steam

T:

temperature [°C]

T*:

pinch temperature [°C]

W:

cooling water

x:

split ratio [kW/°C]

ΔTm :

minimum allowable temperature approach [°C]

AP:

sub-problem above the pinch point

c:

cold stream

h:

hot stream

HE:

heat exchanger

i:

inlet condition

sp:

split stream

t:

target condition

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Authors and Affiliations

  1. Automation Research Center, Pohang Institute of Science and Technology, P.O. Box 125, 790-600, Pohang, Korea

    In-Beum Lee

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  1. In-Beum Lee
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Lee, IB. Synthesis of heat exchanger networks with minimum number of units for pinched problems. Korean J. Chem. Eng. 9, 117–127 (1992). https://doi.org/10.1007/BF02705128

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  • DOI: https://doi.org/10.1007/BF02705128

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