"infeasible solution reduced gradient less than tolerance" ; "A free variable exceeds the range, current value 3.24E+10, current upper bound 1E+10".

21 December 2012 0 9K Report

I have a number of hot and cold process streams with utility streams. The aim was to synthesis the heat exchanger network for minimum total annual cost. I was using GAMS to solve the MINLP equations generated and the above listed error messages were returned. I need assistance from anyone.

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