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CNAA / Theses / 2010 / June /

Research concerning seedless grapes drying process with application of superhigh frequency currents

Author: Netreba Natalia
Degree:doctor of engineering
Speciality: 05.18.12 - Food industry processes and equipment
Scientific advisers: Galina Dicusar
Andrei Lupaşco
doctor habilitat, professor, Technical University of Moldova
Scientific council:


The thesis was presented on the 25 June, 2010
Approved by NCAA on the 6 October, 2010


Adobe PDF document3.70 Mb / in romanian
Adobe PDF document3.71 Mb / in russian


drying, seedless grapes, convection, microwaves, impulse, quality, engineering.


Structure of work: 154 pages (from which 125 pages of the basic text) including 25 figures, 16 tables, introduction, 4 chapters, conclusions and recommendations, 189 references, 5 applications. The obtained results are published in the 19 scientific works, including the patent for invention affirmed in the Republic of Moldova. Research area: processes and devices of food manufactures, fruits drying.

The main objective: elaboration of the grapes drying process with application of the superhigh frequency currents. Research tasks: study of the kinetics and elaboration of the mathematical model of drying process; investigation of the influence of the combined drying process on the quality of obtained dried grapes; elaboration of schemes of installations for drying process of grapes by the combined method.

Methodology of scientific research: the modern theory of the internal heat- and mass-transfer in damp solids with use of internal source of the heat is used. The modern methods of determination of physical, chemical and quality indices of grapes are used.

Scientific novelty: application perceptiveness of the combined drying process of seedless grades – convection + superhigh frequency currents is scientific proved. There were established the optimal technological conditions of drying process of grapes with high quality indices.

Theoretical value: mathematical model of the combined drying process of seedless grapes is obtained. Practical value: schemes of drying apparatus for grapes are offered. The obtained mathematical model allows to automate drying process. It was obtained the positive decision on the patent for invention for suggested drying process.

Implementation of scientific results: technology of obtaining of dried seedless grapes with application of SHF currents by method of the combined drying process is tested at the enterprise Podgoreni SRL (Certificate Nr 01 from October 25, 2008).