Course code LauZ4206

Credit points 2

Drying and Storage of Grains

Total Hours in Course80

Number of hours for lectures8

Number of hours for seminars and practical classes16

Number of hours for laboratory classes8

Independent study hours48

Date of course confirmation22.11.2011

Responsible UnitInstitute of Agricultural Machinery

Course developer

author prof.

Jānis Palabinskis

Dr. sc. ing.

Course abstract

Grain mass simultaneously is a biologically live object, hygroscope and pouring material. Dryer’s exploitation regimes. Grain storing: technologies, regimes. Control devices for drying and storing technologies and processes. Aerodynamic resistance of a grain layer. Energy consumption for carrying out 1 kg water and conditions determining its amount. Grain conveyers.

Learning outcomes and their assessment

After studying the course, the student:
1. Will be able to explain the issues of grain drying and storage, properties of the material to be dried and how the equipment used for drying will work. Homework
2. Will be able to evaluate the properties of grain as a drying object, processing peculiarities and to choose the applicable technical solutions. There will be 2 laboratory works, a report and defense of the work. Control work.
3. Will be able to evaluate the acquired knowledge, will enable to conduct grain drying and storage competently, and independently make decisions on optimal grain realization. There will be 2 laboratory works, a report and defense of the work. Control work.

Course Content(Calendar)

1. Properties of grain – 2h. Test: properties of grain.
2. Grain pretreatment – 2h.
3. Grain cleaning and sorting – 4h.
4. Grain cleaning and sorting machines – 3h. Test: cleaning and sorting of grain.
5. Grain drying. Drying techniques – 3h
6. Active ventilation of grain – 2h.
7. Grain active ventilation equipment – 4h.
8. Control work: Drying of grain with active ventilation.
9. Drying of grains in heaters – 2h.
10. Control of the drying process – 2h.
11. Measurement of air velocity in grain layer – 2h.
12. Energy of grain drying – 2h. Test: drying of grains in heaters.
13. Grain conveyor – 2h
14. Grain warehouses and equipment – 2h.
15. Test: grain transport and storage equipment.
16. Examination

Requirements for awarding credit points

Exam. All laboratory work was done, written tests were successfully completed and home work was defended.
16. Examination

Description of the organization and tasks of students’ independent work

Preparation for tests, using the literature given in the study program and consulting with the lecturer.

Criteria for Evaluating Learning Outcomes

The assessment of the study course exam depends on the cumulative assessment of the course tests.
A student can obtain a successful assessment of test work and homework if at least 50% of the test questions are answered correctly and the homework is successfully defended.
The exam grade is calculated as the arithmetic mean of the passing tests.

Compulsory reading

1. Shlomo Navarro, Ronald T. Noyes. The Mechanics and Physics of Modern Grain Aeration Management. Oklahoma, 2001., 672p..
2. A. Āboltiņš, J. Palabinskis Graudu kaltēšana un uzglabāšana. - Jelgava: LLU, 2007. - 74,; il.
3. Padomi graudu kaltēšanā. SIA “Preiss”, 1997. – 49 lpp.
4. E-studiju materiāli:, e-studijas, TF.

Further reading

1. CIGR handbook of agricultural engineering. – 1999. – Vol.3: Plant production engineering. – 1999. – 632 p..
2. Labību noliktavu kaitēkļi un to apkarošanas iespējas, Linda Būcēna, VAAD, 09.03.2017, Ķekava. – 31 lpp.
3. Graudu pirmapstrāde un uzglabāšana. Lauksaimniecības žurnāla „AgroTops” bibliotēka 2013. - 50 lpp.

Periodicals and other sources

1. Agro Tops un Saimnieks/ Lauksaimniecības mēnešraksti: Rīga.
2. Landtechnik / Fachzeitschrift für Agrartechnik und ländliches Bauen.: Darmstadt.


Elective course for the study programs of Agricultural Engineering of the Technical Faculty “Agricultural Machinery”, “Food Industry Equipment”, “Agricultural Energy”, for undergraduate students of the Faculty of Agriculture.