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3rd Year > Commercial Hvac Systems > Flashcards

Commercial Hvac Systems Flashcards

1
Q

Two types of Hvac systems are

A

CAV
VAV

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2
Q

CAV systems are small and serve single thermo zone name variations

A

CAV with reheat coil
CAV multizone
CAV primary secondary system

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3
Q

What are the too Main style VAV systems 

A

Regular VAV
True vAV

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4
Q

How do you explain the two styles of VAV

A

Regular system does not change speed of fans

VAV system has fan capacity control and D humidification

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5
Q

What reduce energy consumption by and Vav system.?????????????
Check your book for correct

A

In modern systems of verbal fan capacity control reduces the energy

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6
Q

VAV systems also allow for smaller sizing of fans and heating and cooling equipment true or false

A

True

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7
Q

What temperature is delivered at constant vav system 

A

55 f
13 c

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8
Q

What happens when minimal airflow is reached for zones

A

Reheat coil or baseboard heater is activated

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9
Q

How could a constant volume system best be described in relationship to airflow and temperature

A

Constant air volume will supply constant airflow but the air temperature is varied to meet the thermal loads of occupied space

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10
Q

Provide some applications for constant air volume system

A

Restaurants apartments libraries plants schools

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11
Q

What are some system variations for constant air volume

A

CAV with heat reheat coil
Multi zones
Primary secondary

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12
Q

Why are constant air volume systems often the system of choice

A

They are the system of choice for small buildings because of simplicity low-cost and reliable

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13
Q

What are two main styles of VAV systems

A

Regular VAV system
True VAV system

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14
Q

What reduces consumption in VAV system

A

In modern systems fan are variable which reduces energy

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15
Q

How do you the two styles of VAV systems differ

A

Regular system does not change speed but uses dampers to control the air quality
True VAV systems can reduce fan capacity and dehumidification

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16
Q

How many inlets are in a single Supply VA box

A

One

17
Q

How does a single duct VAV system differ from a dual duct VAV system

A

The single VAV is designed with volume control damper
Dual system has two separate supply air ducts and airflow maybe 50% less in cooling

18
Q

Where do the two airstreams mix and a dual duct VAV system

A

The two airstreams mix in the mixing box serving the thermal zone

19
Q

How does the air volume vary in a bypass system

A

Volume in the bypass varies air in the space by cycling unwanted conditioned air back to the central air unit without allowing it to pass through the occupied space

20
Q

What type of air system is usually paired with most gas-fired make up air units

A

Make up air system

21
Q

Name three applications for direct fired make up air unit

A

Commercial kitchen auditoriums airports

22
Q

Flue gases from combustion or discharge outdoors through in a indirect fired and make up air units true or false

A

False

23
Q

Must the exhaust air and make up air systems be interlocked

A

Yes

24
Q

What controls the amount of air and his temperature delivered to each multi zone system

A

Each system has two dampers cold deck hot deck and is controlled by thermostat from occupied space

25
Q

Where are induction reheat systems often found

A

Under windows where they can be offset a cold draft in winter months

26
Q

Why do you most buildings exhaust air systems require make up our system

A

Because large volumes of air are being removed It needs to be replaced so It don’t create negative pressures

27
Q

Two types of gas-fired make up air units

A

Direct gas fired
Indirect gas fired

28
Q

How do two types of MUA systems differ

A

Direct gas Fired has burner directly in the make up airstream and products of combustion become part of the make up air
Indirect gas fire has a sealed combustion which all products of combustion are centred into the environment

29
Q

List four Types of VAV system

A

Single duct
Dual duct
Bypass
True VAV

30
Q

Single duct VAV systems adjust volume of air entering the space true or false

A

True

31
Q

A true VAV system varies………To control the temperature in the space

A

Air volume

32
Q

A direct fired make up air unit can utilize return air is called

A

Recirculation direct fired make up air unit

3rd Year (12 decks)

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