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Design of a CO2 heat pump drier with dynamic modelling tools

Jokiel, M.; Bantle, M.; Kopp, C.; Claussen, I.C. and Tolstorebrov, I. (2019) Design of a CO2 heat pump drier with dynamic modelling tools. In: Proceedings of the 25th International Congress of Refrigeration, August 24-30, 2019, Montréal, Québec, Canada.

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Summary

Drying is an energy and time intensive process which thermal energy demand is mostly provided by fossil resources. Especially in the food processing industry it is important to increase the energy efficiency of drying processes in terms of organic products and sustainability. The potential of using a heat pump with R744 (CO2) as a working media to provide the thermal energy was investigated for typical food drying temperature of 50 °C at a relative humidity of 20 %. A dynamic heat pumpassisted dryer model has been developed and validated. The model was created with respect to heat transfer, pressure loss and flow requirements. The simulated results showed that a closed-loop heat pump assisted drying process has the potential to reduce the energy demand by around 80 % compared to conventional open-loop drying processes with fossil resources as energy source. Furthermore, the implementation of a bypass in the air cycle was examined to further enhance the energy efficiency of the system.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Heat pump, Modelica, simulation, convective drying, CO2, food drying, SusOrgPlus
Subjects: Food systems > Processing, packaging and transportation
Food systems > Produce chain management
Research affiliation: European Union > CORE Organic Cofund > SusOrgPlus
Norway > SINTEF
Norway > Other organizations
Related Links:https://projects.au.dk/coreorganiccofund/core-organic-cofund-projects/susorgplus/, https://www.susorgplus.eu/
Deposited By: Von Gersdorff, Gardis J.E.
ID Code:36584
Deposited On:12 Nov 2019 10:03
Last Modified:12 Nov 2019 10:03
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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