3 (As well as in all the very similar figures within the “Pulp and paper production” to “Automotive producing” sections) is the maximum essential by the person method without heat integration. Determined by what a plant at present does with its waste heat, the desire might be a bit lower. https://industrialheatpumps65318.tkzblog.com/31175799/5-simple-statements-about-waste-heat-recovery-explained