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Lecture

Heat Transfer Processes

In course

CH-334: Unit operation and process technology

L'étudiant sera en mesure de : -Identifier et définir les principales opérations unitaires. -Analyser et optimiser une opération unitaire selon les contraintes. - Proposer des améliorations techniques, économiques et durables. ...

Description

This lecture covers the fundamentals of heat transfer processes, including convection, conduction, and radiation. It discusses correlations for heat transfer coefficients, types of exchangers, evaporators, and condensers. The instructor explains the principles behind heat transfer in various systems and equipment.

Instructor

Thierry Meyer

Thierry Meyer received in 1986 a diploma degree (MSc) in chemical engineering from the Swiss Federal Institute of Technology at Lausanne (EPFL). He was awarded in 1989 a PhD at EPFL for his thesis on micromixing in highly viscous polymeric media. He joined the Institute of Chemical Engineering from 1989 till 1993 as senior scientist in the field of polymerization reactions. In 1994 he joined Ciba-Geigy SA in the pigment division as successively development chemist, head of development a.i. and finally production manager for high performance pigments. Returning to the Institute of Chemical Engineering at EPFL in Lausanne by the end of 1998, he was nominated maître denseignement et de recherche (MER) for leading a new research group in the field of polymers and supercritical fluids, and teaching to chemists, chemical engineers and material sciences, disciplines as process development, introduction to chemical engineering, polymer and organic chemistry at master and bachelor program. In 2005 he owned the responsibility of the Occupational Health and Safety of the school of basic sciences on top of his research activities dealing with risk management and supercritical fluids. He is presently teaching introduction to chemical engineering at bachelor level, risk management at master level and specific courses on safety and engineering risk management in continuing education. He acts also as consultant and expert in risk assessment and chemical engineering matters by the ICC (International Chamber of Commerce) of the World Business Organization, by several consultancy companies and by major and SMEs chemical industries. Thierry Meyer is currently member of several international associations of the European Federation of Chemical Engineering, American institution of chemical engineering, American chemical society and senior member of the American Institute of Chemical Engineers. He was elected chairman of the European Working Party on Polymer Reaction Engineering from 2001 till 2006. He his currently the Swiss academic member of the European Working Party on Loss Prevention and Safety Promotion as well as of the European Working Party on Education. He is member of several editorial boards: Chemical Engineering Research and Design, Macromolecular Reaction Engineering, Chemical Engineering and Technology, Journal of Chemical Health and Safety.

Official source

Ontological neighbourhood

Mechanical engineering

Thermal engineering: Air conditioning

Related concepts (32)

Heat transfer coefficient

In thermodynamics, the heat transfer coefficient or film coefficient, or film effectiveness, is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ΔT ). It is used in calculating the heat transfer, typically by convection or phase transition between a fluid and a solid. The heat transfer coefficient has SI units in watts per square meter per kelvin (W/m2/K).

Heat

In thermodynamics, heat is the thermal energy transferred between systems due to a temperature difference. In colloquial use, heat sometimes refers to thermal energy itself. An example of formal vs. informal usage may be obtained from the right-hand photo, in which the metal bar is "conducting heat" from its hot end to its cold end, but if the metal bar is considered a thermodynamic system, then the energy flowing within the metal bar is called internal energy, not heat.

Convection (heat transfer)

Convection (or convective heat transfer) is the transfer of heat from one place to another due to the movement of fluid. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow). Convection is usually the dominant form of heat transfer in liquids and gases. Note that this definition of convection is only applicable in Heat transfer and thermodynamic contexts.

Heat transfer

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy (heat) between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes. Engineers also consider the transfer of mass of differing chemical species (mass transfer in the form of advection), either cold or hot, to achieve heat transfer.

Condenser (heat transfer)

In systems involving heat transfer, a condenser is a heat exchanger used to condense a gaseous substance into a liquid state through cooling. In so doing, the latent heat is released by the substance and transferred to the surrounding environment. Condensers are used for efficient heat rejection in many industrial systems. Condensers can be made according to numerous designs, and come in many sizes ranging from rather small (hand-held) to very large (industrial-scale units used in plant processes).

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