Building Systems

Question 1

varies the quantity of air; One duct leads in and one or more lead out and is attached to registers mounted in the ceiling; cannot heat one zone while cooling another; low initial cost and low energy use

Answer 1

VAV (variable air volume) box (AAS)

Question 2

4 parts of cooling systems

Answer 2

evaporator, compressor, condenser, expansion valve

Question 3

A one-zone system. A separate supply duct and air-handling unit are required for each zone. This system is used for small or medium-sized buildings with few zones.

Answer 3

single-duct system with constant air volume (CAV) (AAS)

Question 4

System has terminal reheat boxes that reheat previously cooled air. The zone with the greatest cooling load determines how much air is cooled for the entire building.

Answer 4

terminal reheat system (CAV) (AAS)

Question 5

Terminal reheat box also controls air volume. Varying the volume of the supply air manages the temperature. The reheat function is used only when some space needs heating while the others all need cooling.

Answer 5

Terminal reheat system (VAV) (AAS)

Question 6

Every zone receives air at the required temperature through a separate duct. Custom-mixes hot and cold air for each zone—thermostats in each zone control motorized dampers in the air-handling unit.

Answer 6

multizone system (AAS)

Question 7

mixes hot and cold air to achieve the required air temperature. Mixing boxes are located throughout the building instead of a central unit. There is no limit to the number of zones possible. Two sets of large supply ducts are necessary. Costly, not energy efficient and require more building space.

Answer 7

double-duct system (AAS)

Question 8

4 parts of water-based cooling systems

Answer 8

cooling towers, condenser water pumps, reservoirs of cooling fluid, make-up water pumps

Question 9

most appropriate when large amount of ventilation is unnecessary or windows can be opened

Answer 9

all-water system

Question 10

Consists of a fan and a coil in which water circulates. These units are often in cabinets placed under windows. The fan blows room air across coils through which either hot or cold water circulates. Thermostatic valves regulate the flow of water through the coils.

Answer 10

fan-coil system (AWS)

Question 11

Each zone is heated or cooled by a separate water-to-air heat pump with this system. This system is most appropriate where simultaneous heating of some zones and cooling of others is required.

Answer 11

water-loop heat-pump system (AWS)

Question 12

Usually located under windows. They use water for heating or cooling and neutralize heat gain or loss through the building envelope. A small amount of high-velocity air provides ventilation and air movement.

Answer 12

induction system (CS)

Question 13

This type of system cools the ceiling. It cools large areas and distributes the cooled air throughout the space.

Answer 13

radiant panels with supplementary air (CS)

Question 14

There is an all-air system for ventilation and cooling of the interior areas. Fan coil units around the building perimeter neutralize heat gain or loss.

Answer 14

fan-coil with supplementary air (CS)

Question 15

Cool by convection. Can be recessed in a suspended ceiling or hang free. They can also incorporate lighting, sensors, and sprinklers.

Answer 15

Active chilled beams (CS)

Question 16

How are duct sizes labeled?

Answer 16

W x H

Question 17

Space required for air handler

Answer 17

minimum 2’x2’ or 2’x4’ access panel located directly below or adjacent to the unit

Question 18

4 causes of poor IAQ

Answer 18

contaminants from indoor & outdoor sources, biological contaminants, and poor ventilation

Question 19

If health symptoms can’t be traced to a particular source but disappear after the occupant leaves the building.

Answer 19

sick building syndrome

Question 20

If health symptoms are linked to a particular building contaminant. In this case, symptoms don’t resolve after leaving the building, as with Legionnaires’ disease.

Answer 20

building related illness

Question 21

This condition is caused by exposure to chemical contaminants. Long-term sensitivity may recur with each exposure to the chemical.

Answer 21

multiple chemical sensitivity

Question 22

In cooler climates, the HVAC system can employ ___________ to capture exhausted heated air and return that energy to augment the building’s heating system.

Answer 22

energy recovery vents

Question 23

An ___ can be subdivided into as many individually controlled areas as needed.

Answer 23

all-air

Question 24

Which of the following is an air distribution system in which supply air originates at floor level and rises to return air grilles in the ceiling?

Answer 24

displacement ventilation

Question 25

Preferred for projects with poor quality makeup water or in areas with higher water costs. These systems need access to fresh air, resulting in more space to house them. The main disadvantages are the bulky ductwork and the considerable fan power required.

Answer 25

All-air systems

Question 26

This increases the complexity of the mechanical systems but decreases the size of the equipment. Air is supplied for ventilation.

Answer 26

combination system

Question 27

Work purely by natural convection. Can only cool. Takes more of them to cool an area because of the slow motion of natural convection.

Answer 27

passive chilled beams (AWS)