Dissemination activity type: 
Article
Article type: 
Journal article
Title of article: 
Modelica-based modelling of heat pump-assisted apple drying for varied drying temperatures and bypass ratios
Author(s): 
Full Name: 
Michael Bantle
Country: 
Norway
Full Name: 
Michael Jokiel
Country: 
Norway
Full Name: 
Christian Kopp
Country: 
Norway
Full Name: 
Espen Halvorsen Verpe
Country: 
Norway
Web link: 
Target group(s): 
Training organisations
Agrofood chain
Students
General public
Name of Journal: 
Thermal Science and Engineering Progress
Volume number: 
19
Year: 
2020
Status: 
Accepted
Abstract: 

Drying is an energy and time intensive process in which thermal energy demand is mostly provided by fossil resources. It is important to increase the energy efficiency of drying processes especially in the food processing industry in terms of organic products and sustainability. The potential for using a heat pump with CO2 as a working media to provide heating and cooling in the drying cabinet was investigated for typical food drying temperatures of 50–70 °C and for various ratios of moist air being bypassed.

A dynamic heat pump-assisted dryer model was developed and experimentally validated. The model was created with respect to heat transfer, pressure loss and flow requirements. The simulation results show that a closed loop heat pump-assisted drying process reduces the energy demand by up to 84% compared to open loop drying processes with fossil resources as the energy source. The specific moisture extraction rate for a heat pump dryer is up to four times higher than that of an open loop dryer. However, in the heat pump dryer case the drying time is increased by up to 69%.