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| MECA0046-1 | Heat exchangers
- Heat exchangers networks and rational use of energy
- Fundamental and constructive aspects
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| Duration : | Heat exchangers networks and rational use of energy : 15h Th, 15h Pr
Fundamental and constructive aspects : 15h Th, 15h Pr
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| Credits/ECTS : |
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| Holder(s) : | Heat exchangers networks and rational use of energy : Georges Heyen
Fundamental and constructive aspects : Philippe Ngendakumana
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| Coordinator : | Philippe Ngendakumana |
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| Language : | French language |
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| Course contents : | //
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| The first part of the course deals with exergy analysis and its application to various mechanisms of heat transfer.
The second section of the course addresses the analysis of energy supply and demand for chemical processes, and its representation in the form of composite curves.
This leads to a third chapter, where the pinch design method for heat exchanger networks is developed.
Finally we discuss the selection of utilities and energy carriers and their integration in a site wide energy system. |
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| Performance of heat exchangers in steady-state and transient regimes. Heat exchangers logarithmic mean temperature difference (LMTD), effectiveness and number of heat transfer units. Types of heat exchangers studied: double-pipe, finned tubes, plate-fin, shell and tube, plates, fixed and rotating regenerators, serpentine and tank, heat pipes, radiant heat exchangers, heat recovery steam generator (HRSG), cooling towers, tanks for ice stocking and destocking.
Design criteria : heat duty, pressure drop, manufacturing facility, fouling and cleaning, fluids types (corrosion, temperature, pressure and possible leakages) |
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| Course objective : |
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| This course aims to develop skills in performance analysis of heat exchanger networks, as well as in sysnthesis and design of energy systems.
After completing the course, a student should be able to evaluate the exergetic afficiency of a system involving thermal engines, chemical reactors (e.g. combustion chambers) and heat exchangers.
Based on the efficiency of all unit operations, he should be able to troubleshoot a design and identify components which should be retrofitted in order to increase the overall efficiency of the process.
The student shoul also be able to draw composite curves to represent the energy supply and demand of a process, and to interpret them. He should be able to identify on that basis the expected efficiency of several energy saving technologies : combustion air preheat , oxygen enrichment, limitation of excess air, change of pressure level in condensers and boilers, selection of heat pumps or alternate recfrigeration cycles, integration of heat and power cycles.
Finally, starting with composite curves, he should be able to design an efficient heat exchanger network (matching streams that have to exchange heat, and deciding the amount of heat transfer), the goal being to maximize the energy recovery and to reduce the energy requirement of a process. |
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| The course is aimed at giving to the students the fundamental notions needed for solving the rating and sizing (design) problems (overall heat transfer coefficient as well as the pressure drops in the two streams) of different types of heat exchangers. |
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| Prerequisites : |
| | Heat exchangers networks and rational use of energy |
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| Introduction to applied thermodynamics
Basic notions about heat exchangers, combustion, engine cycles and refrigeration |
| | Fundamental and constructive aspects |
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| Course MECA002-0 "Thermodynamique appliquée et introduction aux machines thermiques"
Course MECA019-0 "Transferts de chaleur" |
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| Workshops : |
| | Heat exchangers networks and rational use of energy |
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| Two individual assignments :
- evaluation of the exergy efficiency of a process, knowing the flowsheet and stream properties
- design of a heat exchanger network allowing to maximize the energy recovery of a process, knowing its energy requirement (power required and temperature level) |
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| Practical exercises are solved and homeworks are proposed. Two test benches available in the laboratory are used to train the students and a visit of an industrial plant is organised. |
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| Organization : |
| | Heat exchangers networks and rational use of energy |
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| 5 x 3 hrs courses
2 individual applications, graded on the basis of a written report. |
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| The course consists in oral presentations illustrated by practical cases. It is given during the first semester. |
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| Written notes : |
| | Heat exchangers networks and rational use of energy |
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| Course notes available for photocopy
Copy of all presentations
Some concepts are illustrated by spreadsheets available on the department intranet. |
| | Fundamental and constructive aspects |
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| The course contents is extracted from :
- Kays W. M. and London A. L. Compact Heat Exchangers, 3rd Edition, MacGraw-Hill 1984.
- Hewitt G. F., ShireS G. L. and Bott T. R.. Process Heat Transfer, CRC Press Inc. and Begel house, USA 1994.
- Bontemps A. et al. Technologie des échangeurs thermiques. Techniques de l'Ingénieur. Paris, 1998.
- KAKAC S. and LIU H. Heat exchangers : Selection, rating and thermal design. 2nd edityion, CRC Press Inc, USA 2002.
- Shah R. K. and Sekulic D. P. Fundamentals of heat exchanger design. John Wiley & Sons, New Jersey (USA), 2003. |
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| Assessment : |
| | Heat exchangers networks and rational use of energy |
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| Grade of 2 written reports
Oral examination (after written preparation) |
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| A personnal work (choosen among a precirculated list of themes) has to be performed and presented to the other students. That work counts for 75% of the global mark and the reports of laboratory work for 25%. |
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| Contacts : |
| | Heat exchangers networks and rational use of energy |
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| Georges Heyen
Institut de Chimie B6, room R68
Phone : 04 366 3521
FAX : 04 366 3525
Email : G.Heyen@ulg.ac.be |
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| Philippe NGENDAKUMANA
THERMOTECHNICS Building B49
Phone : +32(0)3664803
E-mail : pngendakumana@ulg.ac.be |
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| Remarks : |
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