“…The Composite Curves are applied to study the sub-ambient heat exchangers in the air separation unit and compression unit, seeking for the Heat Integration between them. Becker et al (2010) studied the infl uence of restricted matches imposed by the industrial constraints upon heat recovery and optimal energy conversion in industrial processes given by Pinch Analysis. Intermediate heat transfer systems are integrated so that restricted heat exchanges become possible and heat recovery penalties, created by those constraints, can be reduced.…”