“…Pinch Analysis) and optimisation based techniques (e.g. mathematical programming) (Ahmad and Hui, 1991;Rodera and Bagajewicz, 1999;Bagajewicz and Rodera, 2000;Kovač Karlj et al, 2002, 2005Goršek et al, 2006). Both approaches have their relative strengths and weakness and a combination of the two can be used either simultaneously or iteratively (Kovač Karlj et al, 2002, 2005Sieniutycz and Je _ zowski, 2009).…”