• Procesna tehnika i zaštita životne sredine, Semester 3, position 5
• Inženjerska grafika i mehatronika, Semester 3, position 5

Students will be introduced to technical bases of materials drying process. The goal of this course is a review of the dryers basic constructions. Through this course students acquire skills and knowledge to recognize problems that occur in complex drying processes.

Successful completion of the study program student acquires specific skills in function of quality performance of professional activities. It is anticipated that students acquire knowledge on specific technical solutions in the fields of drying materials, as well as being able to analyze complex technical solutions.

The definition of the drying process, classification, application and importance of processes and equipment for drying, the definition of basic parameters, measuring of mass moisture content. Statics of the drying process, Kinetics of the drying process, Kinetics of convective drying of wet materials. The curves of drying kinetics, Experimental determination and aproach. The drying speed curves, Design of dryers, General settings in the design of drying, basic requirements for drying, dryers constructions and selection of accessories for drying; choice of drying agent and the heat carrier, Balancing processes, Material and energy balance of dryer, Theoretical and real drying, Graphical presentation of process in a dryer, Heat balance calculaton of dryers, Heat balance calculation of dryers using the "enthalpy-composition" and "enthalpy-temperature" diagrams; hot air and diluted exhaust gas drying and convective dryers efficiency, Types and classification of dryers constructions, Auxiliary dryers equipment, Techno-economic indicators of dryers operation.

Basic terms and parameters, Basic calculations in the drying processes, The calculation of basic characteristics of wet air, Calculation of material and energy balance, Calculation of material and energy balance of theoretical and real dryer in hot air and diluted exhaust gas drying processes (drying agent flow, heat consumption, the coefficient of heat transfer, consumption of heated steam, plant efficiency) Calculation of material and energy balance of theoretical and real dryier during the process of air preheating as a drying agent, as well as drying agent recirculating, Selection and dimensioning of dryers, Determination of drying thermograms (convective drying kinetics) in static-layer, Determination of moisture adsorption of silica gel, Determining the proportion of moisture in the exhaust flue gas ducts, Development of technical documentation, Preparation for development of technical documentation, Development of technical, (constructional) documentation: Selection and sizing dryers, equipment specifications and graphic documentation.

There are no requirements to attend courses, in terms of the previously passed courses.

Obradović M, Jovović A, Karan M, Đurić S, Radić D, Stanojević M, Todorović D, Karličić N, Kuburović M: Dryers – Theory and practice, Union of Mechanical and Electrotechnical Engineers and Technicians of Serbia (SMEITS) and University of Belgrade, Faculty of Mechanical Engineering, 2019. (ISBN 978-86-81505-95-3) Laboratory facility / installation / machine (LFI): Laboratory dryer with auxiliary equipment, Laboratory measurement system (LMS), Equipment for determining proportion of moisture in the air, Equipment for determining proportion of moisture in the flue and waste gases.

Total assigned hours: 45

New material: 12
Elaboration and examples (recapitulation): 6

Auditory exercises: 11
Laboratory exercises: 3
Calculation tasks: 4
Seminar paper: 0
Project: 0
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 4
Review and grading of seminar papers: 0
Review and grading of the project: 0
Test: 0
Test: 0
Final exam: 5

Activity during lectures: 10
Test/test: 0
Laboratory practice: 20
Calculation tasks: 0
Seminar paper: 0
Project: 0
Final exam: 70
Requirement for taking the exam (required number of points): 20

Обрадовић М. и др: Сушаре - Теорија и задаци, Машински факултет у Београду и СМЕИТС, 2019.; Владимир Валент: Сушење у процесној индустрији, Технолошко-металуршки факултет, Београд, 2001.; Димитрије Вороњец, Ђорђе Козић: Влажан ваздух - термодинамичке особине и примена, СМЕИТС, Београд, 2002.; Радивоје Топић: Основе пројектовања, прорачуна и конструисања сушара, Научна књига, Београд, 1989.; Robert E. Treybal: Mass-transfer operations, third edition, McGraw-Hill International book company, 1981.