Investigation on heat recovery strategies from low temperature food processing plants: Energy analysis and system comparison

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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, Trondheim

Håkon Selvnes

Norwegian University of Science and Technology NTNU

Email: marcel.u.ahrens@ntnu.no

Department of Energy and Process Engineering

Norway, Trondheim

Leon Henke

Norwegian University of Science and Technology NTNU

Email: marcel.u.ahrens@ntnu.no

Department of Energy and Process Engineering

Norway, Trondheim

Michael 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, Trondheim

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Supplementary files

Supplementary Files
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2. Figure 1. Simplified representation of the evaluated scenarios with increasing system integration from (a) to (d).

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3. Fig. 2. Overview of parameters used for the simulations with values for Scenario 4 and demand case (200%).

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4. Fig. 3. Summarized results for the investigated scenarios with the different demand cases.

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5. Fig. 4. Relative change in cooling, heating and total power consumption (electrical) for the investigated.

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6. Fig. 5. Relative change in cooling, heating and total COP for the investigated scenarios and demand cases.

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7. Fig. 6. Relative reduction in GHG emissions for the investigated sites for all scenarios and demand cases.

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