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Heat exchangers with or without phase transition and simultaneous heat and mass transfer


At the end of this module, the student will have understood and be able to explain (main concepts) :
- the different types of heat exchangers, condenser, evaporators and other contactors carrying out both heat and mass transfer (cooling tower, humidification-dehumidification process, air-conditioning systems, drying equipment,...)
- the mass and heat transfer mechanisms in this equipment
- the notion of efficiency
- film-wise and drop-wise condensation, the characteristics of the condensation of single or mixed vapours with or without incondensable compounds
- the different mechanisms of boiling
- the concept of local coefficient and overall heat transfer coefficient
- the concept of simultaneous mass/heat transfer and its application to engineering especially for handling the system Air/Water/Steam
The student will be able to:
- select the adequate technology of the heat exchanger depending on the process requirement
- establish mass and energy balances for the heat exchanger (continuous or batch, with or without phase change)
- establish simultaneous mass and energy balances
- design exchangers of all types: determine the local and overall transfer coefficient, evaluate its performance and its variation with a change of operating conditions
- use software such as ASPEN HTFS to design the heat exchanger
- design unit operations involving simultaneous transfers, such as cooling towers, dehumidification towers, air-conditioners, dryers.
- provide basic elements useful for the design of furnaces

Needed prerequisite

Thermal transfers and reactors.
Fluid properties and mass transfer.

Form of assessment

The evaluation of outcome prior learning is made as a continuous training during the semester. According ot the teaching, the assessment will be different: as a written exam, an oral exam, a record, a written report, peers review...