This course aims to extend students’ theoretical and technological background in thermal radiation heat transfer and multimode heat transfer applications including solar thermal systems, condensation/boiling, food refrigeration, electronics cooling and human thermoregulation.

1. Thermal radiation: Spectrum of electromagnetic radiation, Blackbody radiation, Planck’s spectral distribution and Stefan‐Boltzmann law, Definitions of power and intensity of radiation, Properties of Nonblack surfaces, Spectrum of solar radiation.
2. Thermal radiation heat transfer: View factor, Radiation exchange in enclosures composed of a) black surfaces, b) diffuse‐gray surfaces, c) nondiffuse‐nongray surfaces, Radiation shields.
3. Multimode heat transfer: Heat transfer by radiation combined with conduction and convection.
4. Solar thermal systems: Detailed design of solar collectors, Storage of thermal energy, Sizing solar systems (f‐Chart method), Economics, Operation and control, Case studies.
5. Food cooling and freezing.
6. Condensation and boiling heat transfer: Types of boiling, Pool boiling, Nukiyama’s boiling curve, Nucleate boiling, Film boiling, Free and forced convection boiling, Condensation modes, Film condensation (laminar and turbulent) in vertical and horizontal surfaces, Dropwise condensation.

Suggested Literature

• Fundamentals of Heat and Mass transfer, F. Incropera, D.P. Dewitt, T.L. Bergman, A.S. Lavine, John Wiley & Sons, 2006.
• Thermal Radiation Heat Transfer, R. Siegel, J.R. Howell, McGraw Hill, 1981.
•  Heat and Mass Transfer – Fundamentals & Applications,, Y.A. Cengel, A.J. Ghajar, McGraw-Hill Education, 6th ed., 2020.
• Convective Heat Transfer, L.C. Burmeister, John Wiley @ Sons, 1983.
• Solar Engineering of Thermal Processes, J.A. Duffie, W.A. Beckman, John Wiley & Sons, 1991.
• Solar-Thermal Energy, J.R. Howell, R.B. Bannerot, G.C. Vliet, McGraw Hill, 1982-

Greek

Lectures, Practical Exercises