Waste Heat Recovery in the Energy-Saving Technology of Stretch Film Production
Krzysztof Górnicki (),
Paweł Obstawski and
Krzysztof Tomczuk
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Krzysztof Górnicki: Institute of Mechanical Engineering, Warsaw University of Life Sciences—SGGW, 164 Nowoursynowska Str., 02-787 Warsaw, Poland
Paweł Obstawski: Institute of Mechanical Engineering, Warsaw University of Life Sciences—SGGW, 164 Nowoursynowska Str., 02-787 Warsaw, Poland
Krzysztof Tomczuk: Institute of Mechanical Engineering, Warsaw University of Life Sciences—SGGW, 164 Nowoursynowska Str., 02-787 Warsaw, Poland
Energies, 2025, vol. 18, issue 15, 1-19
Abstract:
The stretch film production is highly energy intensive. The components of the technological line are powered by electrical energy, and the heat is used to change the physical state of the raw material (granules). The raw material is poured into FCR (the first calender roller). To solidify the liquid raw material, the calendar must be cooled. The low-temperature heat, treated as waste heat, has dissipated in the atmosphere. Technological innovations were proposed: (a) the raw material comprises raw material (primary) and up to 80% recyclate (waste originating mainly from agriculture), (b) the use of low-temperature waste heat (the cooling of FCR in the process of foil stretch production). A heat recovery line based on two compressor heat pumps (HP, hydraulically coupled) was designed. The waste heat (by low-temperature HP) was transformed into high-temperature heat (by high-temperature HP) and used to prepare the raw material. The proposed technological line enables the management of difficult-to-manage post-production waste (i.e., agriculture and other economic sectors). It reduces energy consumption and raw materials from non-renewable sources (CO 2 and other greenhouse gas emissions are reducing). It implements a closed-loop economy based on renewable energy sources (according to the European Green Deal).
Keywords: technological process; stretch film; recyclate; refrigerant; heat pump (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:18:y:2025:i:15:p:3957-:d:1709087
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