Coursecode: wb4427
Coursename: Refrigeration Technology and Applications

ECTS creditpoints: 4

Faculty of Mechanical, Maritime and Materials Engineering

Lecturer(s): Infante Ferreira, dr.ir. C.A.

Tel.: 015-27 84894

Catalog data:
Refrigeration Technology and Applications. Characteristics of refrigeration systems. Compressors, condensers, expansion devices, evaporators, absorbers, generators. Matching of components of compression refrigeration / heat pump systems. Managing frozen foods: safety in the cold chain, freezing and storing of frozen food products.

Course year: MSc 1st jaar
Period: 2A, 2B
Hours p/w: 2
Other hours:
Assessment: oral
Assessm.period(s): By app.
(see academic calendar)

Prerequisites: wb1126, wb1224, wb4304, wb4300B, wb4302, wb4410A

Follow up:  first assignment

Detailed description of topics:

·         Compressors: function, types and models, thermodynamics, pistoncompressors, screwcompressors, other rotating compressors, centrifugal compressors, simulation models, selection criteria.

·         Condensers: function, types and models, heat transfer (general), heat transfer with condensation of pure gas, condensation in presence of other gases, special types of surfaces, heat transfer at the cooling water side, air cooled condensers, plate-fin condensers, economical optimization.

·         Expansion devices: function, types and models, dynamics of the thermostatic expansion valve, models, selection criteria.

·         Evaporators: function, types and models, heat transfer, aircoolers, combined heat- and mass transfer at the air-side of the aircooler, heat transfer between two-phase flow of refrigerant and internal evaporator surface.

·         Absorption chillers and heat pumps: function, types and models, physical transport phenomena in liquid films, heat and mass transfer in a liquid film.

·         Matching of components of compression refrigeration system: introduction, graphical methods, analytical methods, connection of models, dynamic behaviour.

·         Managing frozen foods: safety in the cold chain, freezing and storing of frozen foods products.

Course material:

·         Cerepnalkowski, I.:"Modern refrigerating machines", Elsevier science publishers, Amsterdam, 1991

·         Herold, K.E. et al. "Absorption chillers and heat pumps", CRC Press Inc., New York, 1996

·         A.C. Cleland, “Food refrigeration processes, analysis, design and simulation". Elsevier Applied Science, London/New York, 1990..

·         C.J. Kennedy, “Managing frozen foods”, CRC Press Inc., New York, 2000.

References from literature:

Remarks (specific information about assesment, entry requirements, etc.):

Goals:
The student must be able to:

1. model an industrial refrigeration process including the application (e.g. freezing of food products)

2. analyze the application process in terms of throughput en specific requirements and convert this information into refrigeration plant requirements

3. optimize the refrigeration plant taking relevant aspects into account including system lay-out, refrigerant, energetic performance and environmental impact

4. understand, reproduce and apply heat and mass transfer models in relation to the components used in refrigeration systems (e.g. condensers, evaporators, secondary fluid heat exchangers, absorbers and generators)

5. understand, reproduce and apply selection criteria for expansion devices and compressors including thermodynamic performance associated with type and part-load behavior

6. design the main components of the system taking recent technological developments, relevant heat (and mass) transfer phenomena and component interaction into account

7. evaluate the differences between the main industrial refrigeration plant alternatives (based on vapor compression or vapor absorption)

Design content:
Roughly 80% of this course is dedicated to the discussion of sizing methods for the various components.

Percentage of design: 80%