Transcript Heat Exchanger

Heat Exchanger
Chapter 7 Part 1
Categories
• Regenerators
• Open-type
• Closed type also called recuperator
Heat Exchange in
Recuperator
• Shell and Tube
• Plate or cross flow
• Spiral
Shell and Tube
Concentric Tube
Parallel Flow
Counter Flow
Multi-Tube
Increase Contact Surface
Cross Flow
Advantages: Increased Surface Area
Baffles increase convective heat transfer coefficient
Disadvantage: Harder to clean
Differential heat expansion
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
Differential Thermal Expansion
compensation
Disadvantages:
Cost
Maximum Pressure
Maximum Temperatures
Cannot be use for volatile fluids
U-Tube
U-Tube
Advantages: Allows thermal expansion
Shell easy to clean
cost
Disadvantage:
Fouling
Tube side hard to clean
Plate Heat Exchangers
Plate Heat Exchangers
Plate Heat Exchanger
Advantages:
Large global heat transfer coefficient
Reduces fouling
Easy to clean
Compact
A/V >700 m2/m3
Disadvantages:
Limited to low temperature and pressure (joints)
Welded joints improve temperature and pressure resistance
Cannot be used with ionized fluids
None standard
Spiral Heat Exchanger
Spiral Heat Exchanger
Advantages:
Large global heat transfer coefficient
No fouling
Easy to clean
Compact
A/V >700 m2/m3
Can be used with ionized fluids
Disadvantages:
Maximum pressure 350 psi
expansive
None standard
Table