1. Fundamentals of Heat Transfer CM 162 Prof. Brad Hyatt

2. What is heat transfer? Theory used to explain how heat moves between objects Theory used to estimated heat loss in building’s interior

3. Modes of Heat Transfer

4. Modes of Heat Transfer Conduction

5. Modes of Heat Transfer Conduction Convection

6. Modes of Heat Transfer Conduction Convection Radiation

7. Conduction

8. Conduction Movement of heat between two substances in contact with each other Most efficient mode of heat transfer Calculate using Fourier’s law of conduction

9. Conduction

10. Convection

11. Convection Motion of heated or cooled mass Transfer between a surface and a moving fluid Liquid Gas Or transfer between one region in fluid to another

12. Convection

13. Convection Natural Convection As fluid is heated, it expands Thus “heat rises” naturally Forced Convection Cooled liquid is forced across warm substance in order to remove heat Often by fan or pump

14. Radiation

15. Radiation Movement of electromagnetic waves Whenever 2 substances of different temperatures in view of each other … radiation occurs Does not require a medium (i.e., fluid or solid contact)

16. Radiation

17. Summary 3 Modes of Heat Transfer: Conduction Convection Radiation