3 (and in all the related figures during the “Pulp and paper manufacturing” to “Automotive production” sections) is the most necessary by the person system with no heat integration. Based on what a plant at present does with its waste heat, the demand could possibly be slightly reduced. Based on https://waste-heat-recovery10976.digitollblog.com/31108577/not-known-factual-statements-about-waste-heat-recovery