1. Heat Exchanger Chapter 7 Part 1

2. Categories Regenerators Open-type Closed type also called recuperator

3. Heat Exchange in Recuperator Shell and Tube Plate or cross flow Spiral

4. Shell and Tube

5. Concentric Tube Parallel Flow Counter Flow

6. Increase Contact Surface Multi-Tube

7. Cross Flow Advantages:Increased Surface Area Baffles increase convective heat transfer coefficient Disadvantage:Harder to clean Differential heat expansion

12. Double Pass Advantages:Increased Surface Area Baffles increase convective heat transfer coefficient Longer contact time per unit volume Disadvantage:Harder to clean Differential heat expansion

14. Differential Thermal Expansion compensation Disadvantages:Cost Maximum Pressure Maximum Temperatures Cannot be use for volatile fluids

16. U-Tube

17. Advantages:Allows thermal expansion Shell easy to clean cost Disadvantage:Fouling Tube side hard to clean

18. Plate Heat Exchangers

20. Plate Heat Exchanger Advantages:Large global heat transfer coefficient Reduces fouling Easy to clean CompactA/V >700 m 2 /m 3 Disadvantages: Limited to low temperature and pressure (joints) Welded joints improve temperature and pressure resistance Cannot be used with ionized fluids None standard

21. Spiral Heat Exchanger

22. Advantages:Large global heat transfer coefficient No fouling Easy to clean CompactA/V >700 m 2 /m 3 Can be used with ionized fluids Disadvantages: Maximum pressure 350 psi expansive None standard Table