Investigation on heat recovery strategies from low temperature food processing plants: Energy analysis and system comparison
- Authors: Ahrens M.1, Selvnes H.1, Henke L.1, Bantle M.2, Hafner A.1
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Affiliations:
- Norwegian University of Science and Technology NTNU
- SINTEF Energy Research
- Issue: Vol 113, No 1 (2024)
- Pages: 41-53
- Section: Original Study Articles
- URL: https://freezetech.ru/0023-124X/article/view/636197
- DOI: https://doi.org/10.17816/RF636197
- ID: 636197
Cite item
Abstract
Industrial food processing plants often have significant thermal requirements at both low and high temperatures. These plants can produce a variety of products including frozen, chilled and grilled/steamed foodstuff, creating thermal demands at several temperature levels. Rapid freezing of the foodstuff at temperatures below -40 °C is required to preserve a high-quality product while steaming/grilling of foodstuff require heat above 100 °C. Heat recovery from the low-temperature refrigeration system provides an interesting opportunity to reduce the overall energy consumption of the plant. This paper presents different strategies to achieve heat recovery from a CO2/NH3 cascade refrigeration system. The low stage of the cascade features pumpcirculated CO2 circuits at -40 °C and -5 °C evaporation levels, while the high temperature stage consists of an ammonia circuit. For this investigation, a case is defined based on requirements for temperature level and heat quantity from the industry. Subsequently, different strategies for the integration and control of the energy systems are examined. Finally, the strategies are compared with selected key parameters and the results are presented.
This article is a translation of the article by Ahrens MU, Selvnes H, Henke L, Bantle M, Hafner A. Investigation on heat recovery strategies from low temperature food processing plants: Energy analysis and system comparison. In: Proceedings of the 9th IIR Conference on the Ammonia and CO2 Refrigeration Technologies. Ohrid: IIF/IIR, 2021. DOI: 10.18462/iir.nh3-co2.2021.0034 Published with the permission of the copyright holder.
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About the authors
Marcel U. Ahrens
Norwegian University of Science and Technology NTNU
Author for correspondence.
Email: marcel.u.ahrens@ntnu.no
Department of Energy and Process Engineering
Norway, TrondheimHåkon Selvnes
Norwegian University of Science and Technology NTNU
Email: marcel.u.ahrens@ntnu.no
Department of Energy and Process Engineering
Norway, TrondheimLeon Henke
Norwegian University of Science and Technology NTNU
Email: marcel.u.ahrens@ntnu.no
Department of Energy and Process Engineering
Norway, TrondheimMichael Bantle
SINTEF Energy Research
Email: michael.bantle@sintef.no
Norway, Trondheim
Armin Hafner
Norwegian University of Science and Technology NTNU
Email: marcel.u.ahrens@ntnu.no
Department of Energy and Process Engineering
Norway, TrondheimReferences
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