Simulation of solar drying of grapes using an integrated heat and mass transfer model

Inês N. Ramos, Teresa R. S. Brandão, Cristina L. M. Silva*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

A mathematical model was developed to simulate solar drying of grapes, integrating heat and mass transfer models solved by an explicit finite differences method, considering changing boundary conditions. The model simultaneously incorporated shrinkage of the product, changes in effective moisture diffusivity and dependence of thermal properties on water content and temperature. Field experiments were carried out in a mixed mode solar dryer located in the North of Portugal, with pre-blanched grapes. A good prediction of experimental solar drying curves was attained. The mathematical model can be applied for simulating solar drying of different foods, once known their specific thermo-physical properties. Simulations obtained with the developed model can be valuable for predicting accurate drying times and consequently to design, control and optimise the production of dried foods.
Original languageEnglish
Pages (from-to)896-902
Number of pages7
JournalRenewable Energy
Volume81
DOIs
Publication statusPublished - 1 Sep 2015

Keywords

  • Grapes
  • Heat transfer
  • Mass transfer
  • Raisins
  • Simulation
  • Solar drying

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