635-3036/01 – Heat Exchangers (VT)
| Gurantor department | Department of Thermal Engineering | Credits | 6 |
| Subject guarantor | doc. Ing. Marek Velička, Ph.D. | Subject version guarantor | doc. Ing. Marek Velička, Ph.D. |
| Study level | undergraduate or graduate | Requirement | Compulsory |
| Year | 1 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 2019/2020 | Year of cancellation | |
| Intended for the faculties | FMT | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
Student will be able:
- 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
- to design the basic parameters of the heat exchanger for specific operating conditions
Teaching methods
Lectures
Tutorials
Summary
Meaning of heat exchangers. Recuperators: the temperature of the medium along the heat exchange surface, the mean temperature gradient, the overall heat transfer coefficient, the heat output, the temperature of the heat exchange surface, the thermal efficiency of the parallel-flow and the counter-flow, the hydraulic calculation. Metal, ceramic, plastic and plate recuperators. Heat pipes. Regenerators.
Compulsory literature:
Recommended literature:
Additional study materials
Way of continuous check of knowledge in the course of semester
Written test and oral exam.
E-learning
Other requirements
Basic knowledge of heat transfer and mechanics of fluids.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
• Classification of heat exchangers. The importance of heat exchangers, energy saving, fuel savings, the degree of recuperation, increasing combustion temperature, increase performance aggregate.
• Thermal calculation of recuperator. The differential equation for the relationship between medium temperature and the size heat transfer surface. Solving equations for various cases 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.
• Overall heat transfer coefficient for the ceramic and metal recuperators. 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-flow and counter-flow 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 recuperators. Operating conditions.
• Plastic recuperators: material, overall heat transfer coefficient, pressure loss, advantages, failings.
• Plate recuperators: types, overall heat transfer coefficient, advantages, failings.
• 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 losses. Types of regenerators.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction