What Determines the Cross Sectional Flow Area in Air Ducts?

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SUMMARY

The Cross Sectional Flow Area of an air duct is determined by multiplying its width and height. In the discussed case, the air duct has dimensions of 65mm by 150mm, resulting in a flow area of 9750mm². It is clarified that only the width and height are necessary to calculate the cross-sectional area, making the length irrelevant for this specific calculation. The discussion emphasizes the importance of understanding the definition of "cross sectional flow area" in the context of duct design.

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  • Understanding of basic geometry principles
  • Familiarity with air duct dimensions and measurements
  • Knowledge of airflow concepts in HVAC systems
  • Ability to perform unit conversions (e.g., mm² to m²)
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HVAC engineers, mechanical engineers, and anyone involved in air duct design and airflow optimization will benefit from this discussion.

toofatcoolz
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I was ask to find the Cross Sectional Flow Area of a air duct given this question : The air duct is a vertically mounted duct of 65mm by 150mm cross-section and approx. 1.2m long.

My working is like this: 65 x 150 = 9750mm2

I just wanted to clarify if my working is right.

Another question i would like to ask, to find Cross Sectional Flow Area, I thought u needed to know the length, width and height? Is it possible to find Cross Sectional Flow Area given just only the length and width?

Hope you guys can help me on it thanks
 
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