Chilled Water Coil Selection Guide for AHU Systems
Learn how to select the right chilled water coil for Air Handling Units (AHUs) in commercial HVAC systems including offices, hospitals, malls, and industries.
What is a Chilled Water Coil?
A chilled water coil is a key heat exchange component used in AHU systems to cool air using chilled water supplied from a central chiller plant.
It plays a critical role in maintaining indoor temperature, humidity control, and energy efficiency in commercial HVAC systems.
Key Factors for Coil Selection
Cooling Load Requirement
Coil capacity must match sensible and latent heat loads of the building.
Airflow (CFM/CMH)
Proper airflow ensures uniform cooling and prevents coil freezing or inefficiency.
Coil Material
Copper tubes with aluminum fins are widely used for better heat transfer and durability.
Fin Spacing
Fin density impacts pressure drop, dust accumulation, and cooling performance.
Types of Chilled Water Coils
- 1 Row Cooling Coil
- 2 Row Cooling Coil
- 3–6 Row High Efficiency Coil
- Face and Bypass Coil Arrangement
Common Coil Selection Mistakes
- Undersized coil leading to poor cooling performance
- Ignoring humidity control requirements
- Wrong fin spacing selection
- Improper chilled water temperature design
Conclusion
Proper chilled water coil selection ensures energy efficiency, better cooling performance, and longer AHU lifespan in commercial HVAC systems.