L8/9 Quizzes Flashcards
HVAC systems are primarily focused on achieving these four goals;
1) Temperature control
2) _ control
3) Air movement
4) Air filtration
Humidity
The target level of relative humidity in building interiors is typically _ %
50
Which of the three thermal load categories involves only heat gain rather than heat flow
Solar radiation
T/F The core of a typical internal load-dominated building is always in cooling mode regardless of the local climate and season
True
In advanced property markets, the most prevalent HVAC system in large buildings is _
Variable air volume (VAV)
The component within an all-water system which is used to condition the air is called a _ _ unit
Fan coil
T/F The compressor within the chilled water plant converts the refrigerant from a low pressure liquid to a high pressure liquid
False
A component of the chilled water plant called a _ _ is commonly located on the roof and cools condensing water for use in the condenser
Cooling tower
Elevators account for approximately _ % of a high-rise buildings energy use
10
T/F A key reason for placing the building services (including elevators) at the East and West facades is to block the glare and heat associated with the afternoon sun
True
What must an elevator system sacrifice if it takes advantage of 2:1 mechanical leverage in its roping and sheave arrangement?
Speed
While selective collective elevator systems target interval times, destination control systems seek to minimise _ time
Travel
Which source of heat flow through a building envelope involves convection?
Air infiltration
Which all-water system can have fan coil units in the same room heating while another is in cooling mode?
4-pipe system
T/F In a chilled water plant, a compressor turns warm return water from the AHU into a high pressure vapour to be condensed
False
