WorksheetsDuctwork Systems for Mechanical Ventilation Quiz
Total questions: 1
Worksheet time: 10mins
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
What is the pressure drop per meter for the main duct section A?
0.55 pascals/m
0.45 pascals/m
0.75 pascals/m
0.65 pascals/m
What is the coefficient for the 90-degree bend between ducts J and L?
0.15
0.11
0.08
0.20
What is the dynamic loss caused by the 90-degree bend between ducts J and L?
0.718 pascals
0.825 pascals
1.046 pascals
0.932 pascals
What is the maximum velocity specified for the main duct section C to limit noise?
5 m/s
2 m/s
3 m/s
4 m/s
What is the pressure drop per meter for the main duct section C?
0.55 pascals/m
0.65 pascals/m
0.75 pascals/m
0.85 pascals/m
