Duration
26h Th, 26h Pr, 4h Proj.
Number of credits
| Master of Science (MSc) in Electromechanical Engineering | 5 crédits | |||
| Master of Science (MSc) in Mechanical Engineering (EMSHIP+, Erasmus Mundus) | 5 crédits |
Lecturer
Language(s) of instruction
French language
Organisation and examination
Teaching in the first semester, review in January
Schedule
Units courses prerequisite and corequisite
Prerequisite or corequisite units are presented within each program
Learning unit contents
The lecture describes the different techniques of cooling and low-temperature heating. The lecture presents the conventional techniques (such as vapor compression refrigeration cycles), but also more innovative techniques that are still under R&D (such as solar cooling or micro-CHP). The lecture gives a detailed description of thermal systems (and components) used through the different cooling and low-temperature heating techniques. In parallel, the lecture presents the modeling and simulation methods of thermal systems and components. The modeling approach is pragmatic: the degree of complexity of the models is adapted to the available information and to the required accuracy according to envisioned applications. This lecture also highlights the "system" approach: it aims at investigating how components of a thermal system interact and how the behavior of the system can be simulated in different working conditions and regimes.
Le lecture will introduce the following thermal systems and components:
- Volumetric machines in compressor and expander modes: piston, screw, vanes, root, rolling piston and scroll machines
- Heat exchangers: air heating, cooling, drying and humidification equipments, evaporators and condensers, cooling towers, sensible and latent thermal storage systems
- Vapor compression refrigeration machines: chillers, room air-conditioners, heat pump systems, two-stage and cascade machines
- Fuel oil, gas and pellet boilers
- Tritherm machines: absorption and ejector machines
- Small and micro-CHP systems: internal combustion engines, Stirling, fuel cells, steam engines, ORC
- Solar collectors: flat-plate and evacuated tube collectors
Learning outcomes of the learning unit
At the end of the lecture, the Student will have a very good knowledge of the different cooling and low-temperature heating techniques. He will be able to explain how thermal components and systems used for heating and cooling work. He will be able to compare these thermal components and systems in terms of operating conditions (order of magnitude of temperatures, pressures, flow rates, thermal, mechanical and electrical powers), of achieved performance (efficiency, effectiveness, coefficient of performance) in nominal and part load regimes and of technical maturity. Also, the Student will be able to model the thermal systems and components introduced in the frame of the lecture and to apply the modeling techniques to other thermal systems that he may encounter in the course of his career of energy engineer.
Prerequisite knowledge and skills
This lecture is in the prolongation of MECA0002-1 (Applied thermodynamics and introduction to thermal machines). It aims at understanding the behavior and modeling thermal machines that operate according to different thermodynamic cycles. The lecture will stress the different irreversibilities (finite temperature heat transfer and pressure losses in heat exchanger, friction in machinery, etc.) that prevent the thermal machine from operating according to theoretical cycles.
Planned learning activities and teaching methods
The lecture will consist in 12 sessions of 4 hours. Each session will comprise a 2 hours lecture followed by a 2 hours session of exercises on computers. The exercises are given at the beginning of the sessions and are solved by means of EES software (Engineering Equations Solver). The instructor and the student solve together the exercises. The solution is displayed on a screen by means of a projector. At the end of the session, the solutions are sent to the student by email. The lecture is also illustrated through 1 session of laboratory that gives the opportunity to the students to improve the analysis of the performance of real machines and systems. The laboratory sessions will be defined as function of the ongoing research projects at the thermodynamic laboratory. They may deal with the study of a compressor, a boiler, a heat pump, a room air-conditioner, etc. Before the date of the exam, the student will have to provide a report describing the test bench, the achieved measurements, their analysis, the simulation model of the thermal machines developed by the student and its experimental validation.
Mode of delivery (face-to-face ; distance-learning)
Face-to-face
Recommended or required readings
The class material consists in a text book that is revised every year and is distributed to the students chapter by chapter (printed and/or pdf versions) before the lectures.
Assessment methods and criteria
The exam consists in one question of theory (3 points) and two exercises (7 points per exercise). The theoretical question is prepared on a sheet and is defended orally. The two exercises are solved on a computer (by means of EES software) and will be defended orally. Students are not allowed to access the textbook of the lecture to solve the exercises. The report about the laboratory session will account for 3 points. The second session exam is organized in an identical way as during the first session.
Work placement(s)
Organizational remarks
Contacts
Prof. Vincent Lemort Tel: 04/366 48 01 vincent.lemort@ulg.ac.be