Trane TRG-TRC014-EN manual Quiz, Questions for Period

Quiz

Questions for Period 1

1Given 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?

2Because the VAV system supplies constant temperature air, how is refrigeration energy savings realized at part load?

3List three building characteristics that favor the application of VAV systems in the building.

Questions for Period 2

4Which type of single-duct VAV terminal unit allows for constant supply airflow to the space?

5Explain why fan-powered VAV terminal units can use air from the ceiling plenum to provide the “first stage” of heating.

6Explain the concept of pressure-independent control.

7What is the principle employed by the linear slot diffuser to distribute air within the space?

Questions for Period 3

8When 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?

9Is the supply fan in a changeover/bypass system constant volume or variable volume?

Questions for Period 4

10How do inlet vanes cause the capacity of a fan to change?

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