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HVAC Systems_FA23 > [L9]_Air Conditioning Systems > Flashcards

[L9]_Air Conditioning Systems Flashcards

1
Q

IND405

What is the Minimum Efficiency Reporting Value (MERV)?

[L8]

A

A measure of how well an HVAC filter captures particles.

[L8]

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2
Q

IND405

True or False: High volume ventilation systems require large air-handling and duct distribution systems.

A

True.

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3
Q

IND405

What is the purpose of a chiller in an HVAC system?

A

To cool water which absorbed heat from indoor space that is used then after to cool the same indoor spaces.

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4
Q

IND405

List three (3) factors to consider when selecting an appropriate Air-Conditioning system for a building?

A
  1. Building size and layout
  2. Climate and weather conditions in the area
  3. Energy efficiency goals and budget constraints
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5
Q

IND405

True or False: The higher the SEER rating on an air conditioning unit, the more energy efficient it is.

A

True.

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6
Q

IND405

What does VAV stand for in HVAC terminology?

A

Variable Air Volume System

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7
Q

IND405

List four (4) common types of Air-Conditioning systems?

A
  1. Split systems
  2. Packaged systems
  3. Central systems
  4. Window units
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8
Q

IND405

What are the five (5) most common types of HVAC filters?

A
  1. Fiberglass filters
  2. Pleated filters
  3. Electrostatic Filters
  4. HEPA Filters
  5. Activated carbon filters
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9
Q

IND405

What is the function of a ductless mini-split system?

A

A ductless mini-split system provides heating and cooling to individual rooms or zones without using ductwork.

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10
Q

IND405

What is the purpose of an air diffuser in an HVAC system?

A

An air diffuser distributes conditioned air throughout a room or space.

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11
Q

IND405

True or False: A rooftop unit (RTU) is only used for commercial buildings.

A

False. RTUs can be used for both residential and commercial buildings.

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12
Q

IND405

What does SEER stand for in relation to Air-Conditioning units?

A

SEER stands for Seasonal Energy Efficiency Ratio.

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13
Q

IND405

What is the function of a humidifier in an HVAC system?

A

A humidifier adds moisture to dry indoor air during winter months when heating systems can cause low humidity levels.

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14
Q

IND405

Name the four (4) most common refrigerants which have been used in HVAC systems.

A
  1. R-22 (Freon)
  2. R-410A (Puron)
  3. R-134a
  4. R32
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15
Q

IND405

What is the purpose of a compressor in an HVAC system?

A

A compressor compresses refrigerant gas to increase its temperature and pressure, allowing it to absorb heat from indoor spaces.

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16
Q

IND405

What is the difference between a single-stage and a two-stage furnace?

A

A single-stage furnace has only one heating output level, while a two-stage furnace has two heating output levels for greater efficiency.

17
Q

IND405

True or False: A geothermal heat pump uses the earth’s natural heat to provide heating and cooling.

A

True.

18
Q

IND405

Describe the function of an evaporator coil in an HVAC system?

A

An evaporator coil absorbs heat from indoor air as refrigerant flows through it, cooling the air before it is distributed throughout a space.

19
Q

IND405

List the four (4) common types of ductwork used in HVAC systems?

A
  1. Galvanized sheet metal
  2. Fiberglass
  3. Flexible
  4. Stainless Steel
20
Q

IND405

What is the function of a condenser coil in an HVAC system?

A

A condenser coil releases heat absorbed from indoor spaces into outdoor air as refrigerant flows through it.

21
Q

IND405

List three (3) common types of commercial HVAC systems.

A
  1. Packaged Rooftop Units (RTUs)
  2. Variable Refrigerant Flow (VRF) systems
  3. Chiller Systems
22
Q

IND405

Explain the purpose of zoning in an HVAC system?

A

Zoning allows for different areas or rooms within a building to have individual temperature control for greater comfort and energy efficiency.

23
Q

IND405

What is the difference between a humidistat and a thermostat in an HVAC system?

A

A humidistat measures and controls the humidity level in a space, while a thermostat measures and controls the temperature.

24
Q

IND405

What are common types of commercial refrigeration systems for food storage?

A
  1. Walk-in coolers/freezers
  2. Reach-in refrigerators/freezers
  3. Display refrigeration cases
25
Q

IND405

What is the function of a damper in an HVAC system?

A

A damper regulates airflow by opening or closing to control the amount of conditioned air that enters a space.

26
Q

IND405

What is the purpose of a backup heating source in an HVAC system?

A

A backup heating source provides heat when the primary heating source (such as a heat pump) cannot keep up with demand due to extreme temperatures or other factors.

27
Q

IND405

What is the function of a reversing valve in an HVAC system?

A

A reversing valve switches the direction that refrigerant flows through an HVAC system to allow for both heating and cooling modes.

28
Q

IND405

What is the function of a filter drier in an HVAC system?

A

A filter drier removes moisture and contaminants from refrigerant to prevent damage to other components in the HVAC system.

29
Q

IND405

True or False: A heat recovery ventilator (HRV) can improve indoor air quality by exchanging stale indoor air with fresh outdoor air.

A

True.

30
Q

IND405

What is the purpose of insulation in an HVAC system?

A

Insulation helps to prevent heat loss or gain through ductwork or other components, improving energy efficiency.

31
Q

IND405

What is the function of a pressure switch in an HVAC system?

A

A pressure switch monitors pressure levels within an HVAC system and can shut off the system if levels become too high or too low.

32
Q

IND405

List four (4) common types of commercial boilers.

A
  1. Firetube Boilers
  2. Watertube Boilers
  3. Condensing Boilers
  4. Electric Boilers
33
Q

IND405

What is the purpose of a UV air purifier in an HVAC system?

A

A UV air purifier uses ultraviolet light to kill bacteria, viruses, and other microorganisms in indoor air for improved indoor air quality.

34
Q

IND405

List three (3) common types of commercial humidifiers.

A
  1. Steam humidifiers
  2. Evaporative humidifiers
  3. Ultrasonic humidifiers
35
Q

IND405

List three (3) common types of commercial dehumidifiers.

A
  1. Refrigerant dehumidifiers
  2. Desiccant dehumidifiers
  3. Ventilating dehumidifiers
36
Q

IND405

How does a geothermal HVAC system work, and what are some benefits of using this type of system for heating and cooling?

A

The ground’s constant temperature powers geothermal HVAC systems. Underground pipelines transfer ground heat in winter and return it in summer. It uses no fossil fuels or greenhouse emissions and works effectively. Geothermal HVAC systems reduce energy expenditures, carbon emissions, and indoor air pollution.

37
Q

IND405

What is the role of air balancing in an HVAC system, and how can it improve energy efficiency and indoor air quality?

A

Air balancing adjusts an HVAC system’s airflow to heat or cool each room properly. This saves energy in locations that don’t need as much heating or cooling and improves air quality by allowing in adequate air. Dampers, variable-speed fans, and filtering devices balance air.

38
Q

IND405

What are some common maintenance tasks for an HVAC system, and how often should they be performed?

[L8]

A

Check the air filters, coils, refrigerant level, ducting, lubricants, and electrical connections. These chores improve efficiency. Usage, environment, and device age dictate maintenance frequency. Change air filters monthly. Depending on usage, coils should be cleaned once or twice a year. Licensed technicians should check refrigerant levels annually. Check the ductwork every five to ten years or as needed for repairs or improvements.

[L8]

39
Q

IND405

What is a demand-controlled ventilation (DCV) system, and how can it improve indoor air quality and energy efficiency in commercial buildings?

[L8]

A

DCV systems regulate outside air intake depending on consumption or IAQ data. Sensors adjust airflow depending on CO2 and room occupancy. DCV systems save energy and clean corporate buildings whichprovide fresh air as required, improving IAQ.

[L8]

HVAC Systems_FA23 (11 decks)

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