635-0818/01 – Heat Exchangers (VT)
Gurantor department | Department of Thermal Engineering | Credits | 6 |
Subject guarantor | prof. Ing. Miroslav Příhoda, CSc. | Subject version guarantor | prof. Ing. Miroslav Příhoda, CSc. |
Study level | undergraduate or graduate | Requirement | Choice-compulsory |
Year | 2 | Semester | winter |
| | Study language | Czech |
Year of introduction | 2004/2005 | Year of cancellation | 2020/2021 |
Intended for the faculties | FMT | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
- to categorize heat exchangers
- to solve power and hydraulic losses or recuperators and regenerators
- to illustrate ways of usage of thermal efficiency in determination of heat transfer surface of recuperator
- to determine conditions of application of recuperative and regenerative heat exchangers
Teaching methods
Lectures
Individual consultations
Tutorials
Project work
Summary
Significance of heat exchangers. Recuperators: temperature profile across the
exchanger heat transfer area, mean temperature difference, heat transfer
coefficient, heat transfer rate, temperature of heat transfer surface, heat
transfer effectiveness of parallel flow and counter-flow, hydraulic
calculation. Metal and ceramic recuperator types. Heat pipes: working fluids,
temperature distributions, heat transfer rate. Regenerators: Thermal
calculation. Heat transfer quantity. Heat transfer coefficient. Hydraulic
calculation. Regenerator types.
Compulsory literature:
LIENHARD IV, J. H., LIENHARD V, J. H. A Heat Transfer Textbook, 4th edition - chapter 3. http://web.mit.edu/lienhard/www/ahtt.html
Recommended literature:
Way of continuous check of knowledge in the course of semester
written test
E-learning
http://katedry.fmmi.vsb.cz/635/;
There is a continuous expansion of e-learning elements into teaching.
Other requirements
Elaboration of the program.
Prerequisities
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Lectures:
Significance of heat exchangers, energy savings, fuel savings, the degree of recovery, increasing combustion temperature, performance engine.
Recuperators - thermal and hydraulic calculation. Derivation of differential equations for the relationship between medium temperature and size heat transfer surface.
Solving this equation for various cases of boundary conditions.
Dependence of temperature difference between the hot and cold streams on the size of the heat transfer surface. Calculation of the mean temperature difference.
Heat transfer coefficient for the ceramic and metal heat exchangers. Influence of heat transfer coefficients on the overall heat transfer coefficient
Heat rate of recuperator. Temperature heat transfer surfaces in the consideration or neglecting the thermal resistance of heat transfer surfaces, a criteria expression.
The definition of heat exchanger effectiveness. Determination of heat exchanger effectiveness for the parallel and counterflow cases for different ratios between total heat capacities.
Hydraulic calculation. Pressure loss by friction, local, geometric. Pressure losses resulting from non-isothermal flow mediums.
Types of metal and ceramic heat exchangers.
Operating conditions of metal heat exchangers. Heat pipes: the working fluid, process temperature and radial heat flow.
Regenerators - Thermal calculation. The amount of heat transmitted. The coefficient of heat transfer. Hydraulic calculation. Pressure loss.
Types of regenerators.
Tutorials:
Heat rate of heat exchanger.
Heat transfer of coefficient by convection and radiation, wall temperature heat exchanger.
Determination of the basic dimensions of heat exchanger.
Heat exchanger effectiveness, fuel utilization factor, recovery factor.
Calculation of heat transfer surfaces of heat exchanger.
Hydraulic calculation and pressure loss of heat exchanger.
The balance equation of the regenerator, types of trellis.
Excursion to the Department of Thermal Engineering Laboratories, familiarization with various types of heat exchangers.
The calculation program to obtain basic parameters of the heat exchanger for the parallel and counterflow cases.
Credit.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction