Ductwork Systems for Mechanical Ventilation Quiz

What is the most common method used for designing commercial HVAC systems?

• Velocity reduction

• Pressure drop

• Static regain

• Equal friction

What is the first thing to do when designing a ventilation system for a building?

• Select the material for the ducts

• Sketch out the ductwork route

• Calculate the heating and cooling loads

• Size the system for peak demand

What is the specific heat capacity of air used as standard in the example?

• 0.83 m³/kg

• 1.026 kJ/kg/K

• 101.325 kPa

• 8°C

What is the density of air in kilograms per meter cubed?

• 3.6

• 0.45

• 0.83

• 1.2

Which shape of ductwork is the most energy efficient?

• Rectangular

• Flat oval

• Round

• Square

What is the main disadvantage of using rectangular ducts compared to round ducts?

• More friction

• More weight

• Limited space

• Higher cost

What is the main factor that determines the pressure drop over a 10-meter distance for ducts made from different materials?

• Duct diameter

• Material roughness

• Velocity

• Volume flow rate

Which type of bend causes a large amount of recirculation regions and increases static pressure?

• Long radius bend

• 180-degree bend

• 45-degree bend

• Right angle bend

What is the name of the software for fluid flow simulation that is used to optimize ductwork design?

• SimScale

• AutoCAD

• ANSYS

• SolidWorks

What is the maximum velocity specified for the main duct section A to limit noise?

• 3 m/s

• 6 m/s

• 4 m/s

• 5 m/s