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TRG-TRC014-EN 83
Questions for Period 1
1 Given a space sensible load of 30,000 Btu/hr [8,793 W], a space dry-bulb
temperature of 78°F[25.6°C], and a primary air dry-bulb temperature of
58°F [14.4°C]:
a What supply airflow is required to balance this load?
Assume the space sensible load is reduced to 18,000 Btu/hr [5,276 W]:
b For a constant volume system, what primary air temperature is required
to balance this new load?
c For a VAV system, what supply airflow is required to balance this
new load?
2 Because the VAV system supplies constant temperature air, how is
refrigeration energy savings realized at part load?
3 List three building characteristics that favor the application of VAV systems
in the building.
Questions for Period 2
4 Which type of single-duct VAV terminal unit allows for constant supply
airflow to the space?
5 Explain why fan-powered VAV terminal units can use air from the ceiling
plenum to provide the “first stage” of heating.
6 Explain the concept of pressure-independent control.
7 What is the principle employed by the linear slot diffuser to distribute air
within the space?
Questions for Period 3
8 When the heat loss exceeds 450 Btu/hr per linear foot [430 W/m per linear
meter] of exterior wall, what type of perimeter heating is generally
recommended?
9 Is the supply fan in a changeover/bypass system constant volume or
variable volume?
Questions for Period 4
10 How do inlet vanes cause the capacity of a fan to change?
Quiz