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HVAC Systems_FA23 > [L11]_Unitary and Room Air Conditioners and Heat Pumps > Flashcards

[L11]_Unitary and Room Air Conditioners and Heat Pumps 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

What is the purpose of a desiccant wheel in an Energy Recovery Ventilation system?

[L11]

A

To remove moisture from the incoming fresh air.

[L11]

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14
Q

IND405

Which type of HVAC system uses a central boiler or chiller to provide heating or cooling to multiple zones through a network of pipes?

[L11]

A

Hydronic Systems use a central boiler or chiller to provide heating or cooling to multiple zones through a network of pipes.

[L11]

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15
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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16
Q

IND405

Explain the difference between an ERV and a HRV?

[L11]

A

An Energy Recovery Ventilation (ERV) system is designed to recover both heat and moisture from the exhaust air and transfer it to the incoming fresh air, while a Heat Recovery Ventilation (HRV) system is designed to recover heat dry-bulb temperature only.

[L11]

17
Q

IND405

What are some common materials used for common piping in HVAC systems?

[L11]

A

Copper and aluminum are two common materials used for common piping in HVAC systems.

[L11]

18
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]

19
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]

20
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]

21
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]

22
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]

23
Q

IND405

What is an air separator in an HVAC system?

[L11]

A

An air separator is a device that removes air from the water circulating in a hydronic heating or cooling system.

[L11]

24
Q

IND405

Why is it important to remove air from the water circulating in a hydronic HVAC system?

[L11]

A

It is important to remove air from the water circulating in a hydronic HVAC system because air can cause problems such as reduced heat transfer, increased energy consumption, and noise.

[L11]

25
Q

IND405

What are some common types of air separators used in HVAC systems?

[L11]

A

Some common types of air separators used in HVAC systems include tangential flow, coalescing, and microbubble.

[L11]

HVAC Systems_FA23 (11 decks)

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