Aux 2 Unit 11 Quiz 1

Correct Answer:
B) To cool the air by circulating chilled water that transfers heat from the air to a refrigerant-cooled chiller

Explanation:
An indirect expansion system uses chilled water as an intermediate medium. The refrigerant cools the water in a chiller, and the chilled water is circulated to air handling units where it cools the air.

Correct Answer:
B) To cool the condenser water before it enters the condenser

Explanation:
In water-cooled chillers, the cooling tower is used to remove heat from the condenser water after it absorbs heat from the refrigerant, ensuring effective heat rejection.

Correct Answer:
C) Chiller

Explanation:
The chiller is the component that cools the water by using refrigerant. The chilled water is then circulated through the system to absorb heat from the air in the air handling units.

Correct Answer:
C) Chilled water

Explanation:
Chilled water is the intermediate medium that circulates between the chiller and the air handling unit, absorbing heat from the air in the AHU and carrying it to the chiller.

Correct Answer:
B) In the chiller's evaporator

Explanation:
The phase change from liquid to vapor occurs in the evaporator of the chiller, where the refrigerant absorbs heat from the chilled water, cooling the water in the process.

Correct Answer:
C) It circulates chilled water to absorb heat from the air and distribute cooled air

Explanation:
The air handling unit (AHU) takes chilled water from the chiller, uses it to cool the air that passes through, and then distributes the cooled air into the space.

Correct Answer:
C) It allows for centralized cooling and better temperature control across large spaces

Explanation:
Indirect expansion systems are suitable for large installations because they can centralize the cooling process, distribute chilled water to different zones, and provide efficient temperature control.

Correct Answer:
C) Expansion valve

Explanation:
The expansion valve regulates the flow and reduces the pressure of the refrigerant as it enters the evaporator, allowing it to absorb heat efficiently and change phase.