E3S Web of Conferences (Jan 2021)

Investigating the kinetics at low temperature heat pump drying and conventional drying of osmotic dehydrated blueberries

  • Hristo Hristov,
  • Svetoslav Aleksandrov,
  • Todorka Petrova,
  • Milena Ruskova,
  • Velitchka Gotcheva,
  • Penov Nikolay

DOI
https://doi.org/10.1051/e3sconf/202132701015
Journal volume & issue
Vol. 327
p. 01015

Abstract

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The possibilities for low-temperature heat pump and conventional drying of blueberries during preliminary osmotic dehydration was studied. A full factor experiment of type 22+3 was performed. The kinetics of the process during variation of the main mode parameters: inlet temperature and thickness of the drying layer (load on the scaffolding) was studied. The curves of the drying process U = f (τ) and the curves of the drying speed dU / dτ = f (U) were constructed. The influence of the regime parameters on the drying time was established. Regression models of the drying coefficient during the second period of drying were presented.