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HVAC Systems_FA23 > [L10]_HVAC Systems Configurations > Flashcards

[L10]_HVAC Systems Configurations Flashcards

1
Q

IND405

List three (3) advantages of using a DOAS system in HVAC?

[L10]

A
  1. Improved indoor air quality
  2. Reduced energy consumption
  3. Better humidity control

[L10]

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2
Q

IND405

What is the purpose of a mixing box in HVAC systems?

[L10]

A

A mixing box is used in HVAC systems to mix outdoor and indoor air for ventilation purposes. This helps to maintain indoor air quality while minimizing energy consumption.

[L10]

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3
Q

IND405

How do multi-zone control systems work in HVAC?

[L10]

A

When heaters or monitors are put in each zone or room, the temperature can be changed. Ventilating zones or rooms with shutters or valves. Changing the amount of heating or cooling based on demand by using fans or motors with different speeds.

[L10]

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4
Q

IND405

What is the role of water distribution units in chilled water systems?

[L10]

A

Water distribution units in chilled water systems are used to distribute chilled water from a central chiller plant to various zones of a building for cooling purposes.

[L10]

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5
Q

IND405

What is the purpose of an economizer in HVAC systems?

[L10]

A

When circumstances allow, HVAC systems use outside air for cooling via an economizer. Instead of using mechanical cooling systems, opening dampers or vents lets outside air cool the structure.

[L10]

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6
Q

IND405

What is the difference between a fan coil unit and a chilled beam in HVAC?

[L10]

A

Fan coil units and chilled beams heat and cool HVAC systems differently. Fan coil units utilize air, whereas chilled beams use water. Chilled beams utilize less energy than fan coil systems because they require less airflow. Due to reduced airflow, they cost more to install.

[L10]

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7
Q

IND405

What is ASHRAE Standard 62?

[L10]

A

ASHRAE Standard 62 sets air quality standards for commercial buildings. Airflow, filtration, and humidity control are recommended.

[L10]

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8
Q

IND405

What is a Heat Pump?

[L10]

A

Heat pumps are used to heat. In heating mode, it moves heat from the air outside or the ground into the room, and in cooling mode, it moves heat from the room into the air outside.

[L10]

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9
Q

IND405

What is a ductless mini-split system in HVAC?

[L10]

A

Ductless mini-splits HVAC systems heat and cool rooms using several indoor units. Refrigerant lines link inner and exterior units. Controlling each inner device independently provides you more options and saves energy.

[L10]

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10
Q

IND405

What is a humidistat in HVAC?

[L10]

A

Humidistats measure the amount of moisture in the air inside. It works like a timer for humidity. Humidistats can turn on or off humidifiers and dehumidifiers to keep the air inside comfy and healthy.

[L10]

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11
Q

IND405

What is the definition of Air-Conditioning according to Willis Carrier?

[L10]

A

Willis Carrier defined air conditioning as controlling humidity, temperature, cleanliness, and air movement and circulation.

[L10]

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12
Q

IND405

What are the five (5) criteria that must always be met in selecting an HVAC system?

[L10]

A
  1. Humidity
  2. Temperature
  3. Purity
  4. Air-motion
  5. Ventilation

[L10]

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13
Q

IND405

What is a CRAC unit in HVAC?

[L10]

A

CRAC units are HVAC systems developed for data centers and other mission-critical buildings that need precise temperature and humidity management.

[L10]

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14
Q

IND405

How does a CRAC unit work?

[L10]

A

It draws hot air from the room, cools it using refrigerant, and distributes the cooled air through ducts or vents. CRAC units include complex controls and sensors to monitor and regulate temperature, humidity, ventilation, and other environmental conditions vital to sensitive electronic equipment.

[L10]

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15
Q

IND405

What are four (4) advantages of a centralized heating and cooling system in HVAC?

[L10]

A
  1. Primary cooling and heating may be provided regardless of equipment and system operating outside the central plant.
  2. Larger but fewer pieces of equipment lower facility operating and maintenance costs.
  3. Centralized service reduces barriers.
  4. Energy-efficient design, recovery, thermal storage, and management can be easier and cheaper to execute.

[L10]

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16
Q

IND405

What are four (4) disadvantages of a centralized heating and cooling system in HVAC?

[L10]

A
  1. Equipment shortages can delay manufacturing and delivery.
  2. Complex equipment requires a more skilled operator than dispersed equipment.
  3. The building equipment needs a central position.
  4. Equipment room height minimum may be required.

[L10]

17
Q

IND405

Explain a dual duct system in HVAC?

[L10]

A

Dual-duct HVAC devices condition a space using two air ducts. Each duct’s cool-to-warm ratio controls air temperature. Large corporate buildings with diverse climates employ dual duct systems. Single-fan dual-duct units are non-reheating.

[L10]

18
Q

IND405

What is a reheat system in HVAC?

[L10]

A

A reheat system is an HVAC system that uses a heating coil to raise the temperature of air that has been cooled by a cooling coil.

[L10]

19
Q

IND405

What types of buildings typically use Reheat Systems?

[L10]

A

Reheat systems are typically used in buildings where precise temperature control is required, such as hospitals, laboratories, and data centers.

[L10]

20
Q

IND405

What is the recommended DOAS coil face FPM?

[L10]

A

The DOAS coils should be sized for 400-FPM maximum velocity, have broad fin spacing (8
fins per inch maximum), and have flat plate fins for easy fouling inspection and cleaning

[L10]

21
Q

IND405

List four (4) Heating Only Equipment options.

[L10]

A
  1. Baseboard Radiation
  2. Finned Tube Radiators
  3. Radiant Floor
  4. Unit Heaters (Cabinets)

[L10]

22
Q

IND405

List four (4) Heating & Cooling Equipment options.

[L10]

A
  1. Fan-Coil Unit
  2. Water Srouce Heat Pump
  3. Radiant Panels
  4. Hot/Chilled Induction Beams

[L10]

23
Q

IND405

How are fan coil unit condensate drains typically connected?

[L10]

A

Condensate drain risers are factory-installed in floor-toceiling, chase-enclosed units.

[L10]

24
Q

IND405

Describe what a two-pipe change over system is?

[L10]

A

A two-pipe changeover system uses the same pipes for heating and cooling, and the FCUs must be manually switched between modes.

[L10]

25
Q

IND405

Explain how a four-pipe system works?

[L10]

A

Four-pipe distribution systems send hot and cold water to fan coil units (FCUs) through various pipes. FCUs can automatically heat and cool all seasons using a four-pipe distribution system.

[L10]

26
Q

IND405

What is a Heat Pump?

[L10]

A

Heat pumps are used to heat. In heating mode, it moves heat from the air outside or the ground into the room, and in cooling mode, it moves heat from the room into the air outside.

[L10]

HVAC Systems_FA23 (11 decks)

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