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THERMAL SCIENCE
International Scientific Journal
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RESEARCH ON THE DRYING CHARACTERISTICS OF WHITE RADISH SLICES BASED ON A DUAL-SOURCE HEAT PUMP-LOW-TEMPERATURE REGENERATION DESICCANT WHEEL SYSTEM
ABSTRACT
This study proposes a dual-source heat pump-desiccant wheel drying (HP-DWD) system that integrates low-temperature regeneration to overcome the limitations of conventional open- and closed-loop systems. Drying experiments on white radish slices were conducted at temperatures of 35- 45 °C, air velocities of 1-3 m/s, and slice thicknesses of 3-7 mm. At 45°C, HP-DWD reduced drying time by 20% and energy consumption by 8.1% compared to heat pump drying (HPD), while rehydration capacity improved by 6%. Exergy efficiency increased by 21.24%, owing to reduced compressor and condenser losses. The Page model accurately described the drying kinetics (R² = 0.994). These results demonstrate the system's potential for energy-efficient, high-quality drying of heat-sensitive agricultural products.
KEYWORDS
PAPER SUBMITTED: 2026-05-25
PAPER REVISED: 2026-06-28
PAPER ACCEPTED: 2026-07-03
PUBLISHED ONLINE: 2026-08-08
DOI REFERENCE: https://doi.org/10.2298/TSCI260525160Y
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© 2026 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International licence