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Design of a CO2 heat pump drier with dynamic modelling tools Michael JOKIEL(a), Michael BANTLE(a), Christian KOPP(a), Ingrid C. CLAUSSEN(a), Ignat TOLSTOREBROV(b) (a) Department of Energy Processes, SINTEF Energy Research, NO-7465 Trondheim, Norway, Michael.Jokiel@Sintef.no (b) Norwegian University of Science and Technology, Department of Energy and Process Technology, 7465 Trondheim, Norway ABSTRACT 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 pump- assisted 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. Keywords: Heat pump, Modelica, simulation, convective drying, CO2, food drying 1 INTRODUCTION The process of drying is widely-used in all kind of industries and is a very energy consuming process. It is estimated that about 12 % of the total energy used in industries is used by drying processes (Strumillo et al. 2014), whereas the major amounts are demanded by the food and paper industries. Figure 1: Scheme of a heat pump driven convective drying processPDF Image | Design of a CO2 heat pump drier with dynamic modelling tools
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