Course detail

Electrical Heat Technology

FEKT-MPA-ELTAcad. year: 2022/2023

Opening part of the subject is devoted to the calorimetry and the heat transfer. Student deepens his knowledge in this theory and uses these knowledges for solving problems in numerical exercises. 

The main part is focused on the individual type of electric heatings. It's resistant heating, electric arc heating, inductive, dielectric and microwave heating. 

Modern conceptions are represented by the plasma, laser, electron and infrared heating. 

Student gets to know the physical nature and theory of individual heatings and the basic electrothermal applications in the industrial area.

The higher attention is devoted to the resistance crucible furnace and its design and electric arc furnace and settings of optimal parameters of furnace working.

Language of instruction

English

Number of ECTS credits

5

Mode of study

Not applicable.

Guarantor

doc. Ing. Ilona Lázničková, Ph.D.

Department

Department of Electrical Power Engineering (UEEN)

Learning outcomes of the course unit

The graduate of the course should be able to:
- define and describe the basic quantities of electrothermal technology, heat transport, calorimetry and calculate them,
- design and calculate the basic parameters of heating elements in a resistance crucible furnace,
- list the different types of electrothermal heating and explain their physical nature,
- list and describe the technical applications of electrothermal heaters.
 

Prerequisites

The subject knowledge on the Bachelor´s degree level is requested.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Teaching methods include lectures, numerical exercises and laboratories.

Course is taking advantage of e-learning (Moodle) system.

Assesment methods and criteria linked to learning outcomes

During the semester, the student can get a maximum of 30 points - credit test (max. 10 pts.), individual work (max. 12 pts.), laboratory protocols (max. 8 pts.).
Credit: To receive credit, a student must obtain a minimum of 50% of the points from each scored activity.
The exam (max. 70 points) - only writen exam, the student must obtain a minimum of 30 points.
The requirements for successful completion of the course are set annually by the subject guarantor.


Course curriculum

Lectures:
1. Basic terms, units, analogy between electric and temperature field, calorimetry, calculations.
2. Heat transfer, conduction, convection, radiation, compound cases of heat transfer, calculations.
3. Measuring of temperature in electrothermal technology. mechanical and electrical thermometers.
4. Electrical heating elements, materials of electrical heating elements, calculation of basic parameters of heating elements.
5. Resistance heating, direct and indirect heating. Electrical rasistance furnaces.
6. Design of resistance crucible furnace for melting of aluminium.
7. Electric arc heating, direct arc, alternating arc, stabilization of arc, static and dynamic characteristics of arc.
8. Electric arc furnace, connection to net, furnace transformer, short path, choke coil, electrodes, circle diagram of electrical arc furnace.
9. Plasma heting, plasma, basic processes in plasma, plasma heater, melting plasma furnace.
10. Induction heating, induction crucible and canal furnace, screening, pinch efect.
11. Induction heating, basic theory electromagnetig field, Poyinting radiant vector.
12. Dielectric heating, polarisation, loss number, microwave heating, magnetron.
13. Special electrothermal hetings - laser heating, electron heating, infrared heating, resonator, electron gun.

Numerical exercies:
Calorimetry, heat transfer and design of resistance crucible furnace are solved in concrete problems.

Laboratory exercises: 4 laboratory tasks

Work placements

Not applicable.

Aims

The aim of the course is to introduce students to the theory of basic and special types of electrothermal heaters and their technical applications. 

 

Specification of controlled education, way of implementation and compensation for absences

The content and forms of instruction in the evaluated course are specified by a regulation issued by the lecturer responsible for the course and updated for every academic year.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Goňo R., Hradílek Z., Král V.: Power Plants (part 3) Electro-Thermal Technology, VŠB - Technical University of Ostrava, Ostrava 2015. (EN)

Recommended reading

Not applicable.

Elearning

eLearning: currently opened course

Classification of course in study plans

  • Programme MPA-EEN Master's 1 year of study, summer semester, compulsory

Type of course unit

 

Lecture

26 hod., optionally

Teacher / Lecturer

doc. Ing. Ilona Lázničková, Ph.D.

Syllabus

Introduction to heating theory, calculation
Temperature measurement
Materials for heating cells, construction of heating elements
Design of electrical heating cells for industry use
Indirect and direct heating aplication
Theory of electrical arc, electric-arc furnaces
Inductive nad microwawe aplications
Dielectrical heat, IR heatin in technical practice
Plasmatic heating, arc and resistant welding
Electron heating devices, lasers aplication
Building heating, direct and storage heating
Heating pump and cogeneration, economical evaluation of electrical heating
Ecological aspects of electrical heating equipments

Fundamentals seminar

10 hod., compulsory

Teacher / Lecturer

doc. Ing. Ilona Lázničková, Ph.D.

Syllabus

Basic terms and heating quantities.
Heating transfer - conduction, convection, radiation.
Design and calculation of heating elements.
Design of resistance crucible furnace.
Room heating, calculation of heating losses.

Laboratory exercise

16 hod., compulsory

Teacher / Lecturer

doc. Ing. Ilona Lázničková, Ph.D.
Ing. Tomáš Černý

Syllabus

Measurement of temperature sensors
Properties of heating element Maxim and Oacley
Mesurement of characteristic quantities of resistant materials
Measurement of heating conductivity

Elearning

eLearning: currently opened course