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HVAC Systems_SP25 > [L11]_Refrigeration HVAC Systems > Flashcards

[L11]_Refrigeration HVAC Systems Flashcards

1
Q

IND405

Define what Unitary Air-Conditioning equipment is?

[L11]

A

Unitary air conditioning systems are built on-site and use refrigerant cycle devices that were matched at the factory. Unitary air conditioners give you options for placement, design, heat rejection, and the outside of the unit.

[L11]

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2
Q

IND405

List three (3) different types of heat rejection methods used in Unitary Air-Conditioners?

[L11]

A
  1. Air-cooled
  2. Water-cooled
  3. Evaporative condenser

[L11]

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3
Q

IND405

What are the four (4) common placement options for Unitary Air-Conditioners?

[L11]

A
  1. Floor standing
  2. Wall mounted
  3. Ceiling suspended
  4. Roof mounted

[L11]

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4
Q

IND405

What is a PTAC HVAC systems?

[L11]

A

PTAC stands for Packaged Terminal Air Conditioner and refers to a type of through-the-wall air conditioning unit commonly used in hotels or apartments with individual room controls.

[L11]

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5
Q

IND405

What is the purpose of Water Source Heat Pump Units (WSHP)?

[L11]

A

Water Source Heat Pump Units are made to heat and cool by exchanging heat through water instead of air, which makes them more efficient and less expensive in some situations.

[L11]

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6
Q

IND405

List three (3) advantages of Mini-Split units over traditional unitary air conditioners?

[L11]

A
  1. Quiet operation due to separate indoor units
  2. Improved energy efficiency due to lack of ductwork losses
  3. Ease of installation in retrofit applications where ductwork is not feasible or desirable

[L11]

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7
Q

IND405

What is the difference between a packaged window A/C system and a through-the-wall PTAC unit?

[L11]

A

Packaged window A/C systems are designed to fit into a window opening and cool a single room, while through-the-wall PTAC units are installed through an exterior wall and provide heating and cooling for individual rooms with separate controls.

[L11]

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8
Q

IND405

What is the difference between a Mini-Split unit and a Multi-Split unit?

[L11]

A

Mini-Split and Multi-Split units have one outside unit linked to one or more inside units via refrigerant lines. Mini-Split units are utilized in smaller applications with individual room control, while Multi-Split units are used in bigger applications with many indoor units.

[L11]

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9
Q

IND405

Which type of HVAC system uses water as the heat exchange medium?

[L11]

A

Water-cooled Unitary Air-Conditioner

[L11]

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10
Q

IND405

Which type of HVAC system is commonly used in schools, hospitals, and other large facilities?

[L11]

A

Packaged, WSHP, & ERV Systems

[L11]

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11
Q

IND405

Which type of HVAC system provides individual room control with separate controls for each zone?

[L11]

A

The Through-the-Wall PTAC & PTAHs type of HVAC system provides individual room control with separate controls for each zone.

[L11]

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12
Q

IND405

Which type of HVAC system is typically used in retrofit applications where ductwork is not feasible or desirable?

[L11]

A

Mini-Split Units are typically used in retrofit applications where ductwork is not feasible or desirable.

[L11]

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13
Q

IND405

Which type of HVAC system uses a network of underground pipes to exchange heat with the earth for heating or cooling purposes?

[L11]

A

Geothermal Systems use a network of underground pipes to exchange heat with the earth for heating or cooling purposes.

[L11]

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14
Q

IND405

What is a refrigerant line set in an HVAC system?

[L11]

A

A refrigerant line set is a pair of copper pipes that connect the indoor and outdoor units of an air conditioning or heat pump system.

[L11]

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15
Q

IND405

What is the purpose of a suction line in an HVAC system?

[L11]

A

The suction line is responsible for carrying low-pressure refrigerant vapor from the evaporator to the compressor in an HVAC system.

[L11]

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16
Q

IND405

What is the purpose of refrigerant liquid line in an HVAC system?

[L11]

A

A liquid line is a pipe that carries high-pressure refrigerant liquid from the condenser to the evaporator in an HVAC system.

[L11]

17
Q

IND405

What is the purpose of a liquid line in an HVAC system?

[L11]

A

The purpose of a liquid line is to transport high-pressure refrigerant liquid from the condenser to the evaporator, where it will be converted into low-pressure vapor and used for cooling or heating.

[L11]

18
Q

IND405

Why is it important to have a filter drier installed in an HVAC system’s liquid line?

[L11]

A

It is important to have a filter drier installed in an HVAC system’s liquid line because moisture, acid, and other contaminants can damage the compressor and other components of the system if they are not removed from the refrigerant.

[L11]

19
Q

IND405

Which of the following refrigerants has the lowest Direct Global Warming Potential (DGWP)?
A. Freon-12
B. R-32
C. R-290 (Propane)
D. Ammonia

[L11]

A

D. Ammonia (0 DGWP)

[L11]

20
Q

IND405

True/False: The production of all HCFCs will be completely banned by 2030 under the phasedown schedule.

[L11]

A

True

[L11]

21
Q

IND405

Match the compressor type with its key characteristic:
1. Rotary Compressor
2. Scroll Compressor

A. Uses interlocking scroll patterns for refrigerant compression.
B. Employs a rotating offset ring inside a cylinder for refrigerant compression.

[L11]

A

1 = B. Uses a rotating offset ring inside a cylinder for refrigerant compression.
2 = A. Uses interlocking scroll patterns for refrigerant compression.

[L11]

22
Q

IND405

True/False: By 2025, the EPA mandates a global warming potential (GWP) limit of 750 for air conditioning refrigerants, requiring the replacement of R-410A.

[L11]

A

True

[L11]

23
Q

IND405

What happens during Stage 4 of the rotary compressor cycle?
A. Low-pressure refrigerant is drawn into the compressor.
B. The refrigerant reaches full compression and is discharged into the hot gas line.
C. The refrigerant begins compressing within the cylinder.
D. The refrigerant gets trapped in interlocking scrolls for progressive compression.

[L11]

A

B. The refrigerant reaches full compression and is discharged into the hot gas line.

[L11]

24
Q

IND405

True/False: Scroll compressors are generally more efficient than rotary compressors because they provide continuous compression without the need for valves to maintain pressure.

[L11]

A

True

[L11]

25
Q

IND405

Which type of compressor is most commonly used in heat pumps with less than 2-Tons of cooling capacity?
A. Scroll Compressor
B. Rotary Compressor
C. Reciprocating Compressor
D. Centrifugal Compressor

[L11]

A

B. Rotary Compressor

[L11]

HVAC Systems_SP25 (12 decks)

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