Preventive maintenance of MEP Equipment

Why CHW Always Connects on the Bottom Side of AHU

This video tutorial explains the reasoning behind why chilled water (CHW) is always connected on the bottom side of an Air Handling Unit (AHU).

Video Presentation

Explanation

Connecting the chilled water (CHW) on the bottom side of an AHU is a common practice in HVAC design due to several reasons:

Gravity-Assisted Flow: Ensures proper drainage and air removal from the coil.
Air Venting: Facilitates the venting of air bubbles which tend to rise to the top.
Improved Heat Transfer: Maximizes the efficiency of heat exchange between the air and water.

Advantages

The advantages of connecting CHW on the bottom side of AHU include:

Enhanced system efficiency.
Reduction in air pockets and improved water circulation.
Increased lifespan of the AHU due to optimized operation.

Applications

This practice is applied in various HVAC systems including:

Commercial buildings.
Industrial facilities.
Residential complexes.

Conclusion

Connecting CHW on the bottom side of an AHU is a crucial design consideration that improves efficiency, facilitates maintenance, and enhances overall system performance.

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