Question

The most commonly used method for the design of duct size is the

Answer 1

Answer:

STATIC REGAIN METHOD is most commonly used method for the design of duct size.

Explanation:

• This method is the most accurate but take lots of time for calculation.
• basically the trunk duct is selected for minimal duct velocity, and each take-off or outlet supply is regulated at take-off point with a damper.

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Answer 2

Answer:

Equal friction method - Where a constant Head Loss is taken and duct sizes are taken considering this constant loss throughout the ducting. Most commonly used method because of easier calculation.

Velocity Reduction Method - Here duct sizing is done by varying the velocity in the main and branch ducts.

Static regain method - Here the total frictional drop and fitting pressure drop is calculated for the ducts, and the line with the biggest pressure drop is taken. This method is the most accurate but take lots of time for calculation.