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HVAC - Chillers, Refrigerant, Compressors and Heating Systems


Quiz Questions

1.Air-conditioning system types in commercial buildings are broken down into three broad categories for the purposes of this study: Central, Packaged, Individual AC and uncooled.
True
False
2. Central systems are defined as those in which the cooling is generated in a chiller and
distributed to air-handling units or fan-coil units with a chilled water system.
True
False
3.Packaged systems include rooftop units or split systems which have direct-expansion cooling coils, with heat rejection remote from the cooled space.
True
False
4.Individual AC systems involve self-contained packaged cooling units, which are mounted in windows or on an external wall such that cooling occurs indoors and heat rejection occurs outdoors.
True
False
5.Figure 3-1 is the schematic of:
A Central system with a water-cooled chiller.
A Packaged System
6.Heating system types can be classified fairly well by the heating equipment type. The heating equipment used in commercial buildings includes the following types.

  • District Heating
  • Boilers (Oil and Gas)
  • Furnaces (Oil, Gas, and Electric)
  • Packaged HVAC Unit Furnaces (Gas and Electric)
  • Packaged Heat Pumps
  • Unit Heaters
  • Packaged Terminal Heat Pumps
  • Individual Space Heaters
True
False
7.Major recent trends in heating equipment include the following:

  • Continuing development of heat pumps
  • Continued reduction in equipment size and development of modular heating equipment
  • Efficiency improvements in combustion equipment leading to development of condensing equipment
  • Development of radiant heating equipment
  • Modulating and low-input heating equipment
  • Improved emissions control
True
False
8.Central Chiller is a type of cooling equipment that is centrally located and that produces chilled water in order to cool air. The chilled water is then distributed throughout the building by use of pipes. These systems are also commonly known as "chillers." The two major categories of chillers are “water-cooled” and “air-cooled”. “Water-cooled” chillers use water to transport away the heat rejected in their condensers. The water (called “condenser water”) is cooled in a cooling tower. “Air-cooled” chillers have condensers which are cooled with ambient air.
True
False
9.Boiler is a type of space-heating equipment consisting of a vessel or tank where heat
produced from the combustion of such fuels as natural gas, fuel oil, or coal is used to
generate hot water or steam. Many buildings have their own boilers, while other buildings have steam or hot water piped in from a central plant.
True
False
10.District Chilled Water is water chilled outside of a building in a central plant and piped into the building as an energy source for cooling. Chilled water may be purchased from a utility or provided by a central physical plant in a separate building that is part of the same multi-building facility (for example, a hospital complex or university).
True
False
11.The building type with the highest HVAC energy use is the office category. Next in importance are the Mercantile & Service and Public Building categories. All three of these building types have a medium amount of energy usage intensity (85 to 115 kBtu/sqft/year for total HVAC primary energy intensity),
True
False
12.Building types such as Education, Warehouse/Storage, and Lodging have relatively low HVAC energy use intensity.
True
False