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Exac > 3m Coordinate Eng. Systems > Flashcards

3m Coordinate Eng. Systems Flashcards

1
Q

M01 - 2 types of sprinkler systems:

A

Wet: Water under sufficient pressure to provide immediate and continuous discharge via sprinkler heads automatically.

Dry: Pipes filled with air which releases via sprinkler heads making way for water into pipes (good if exposed to cold)
(sub categories:
deluge: open heads at all time, flow ctrl by smoke, fire, flame sensing device
pre-action: valve ctrl by more sensitive system; where valuables could be destroyed by water like museums)

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2
Q

M02 - 3 types of standpipes:

A

Chop 11.25
Wet: Contain water under pressure & fitted with fire hoses.
Dry: Contain no water, used by Fire Dept to connect to a hydrant or pumper truck.
Siamese: Installed close to ground & main entry. Fire Dept connects to in order to supply sprinkler system.

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3
Q

M03 - What heating & cooling systems will have minimal initial costs? (2 qualities & corresponding systems)

A

1 - simplest air system:
SINGLE DUCT/CONSTANT AIR

2 - or NO ductwork:
THROUGH WALL & PKG TERMINAL UNITS

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4
Q

M05 - What is the typical pressure of a public service pipe? (psi)

A

Chop 11.23

50psi

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5
Q

M04 - What heating & coolings systems will min. maintenance requirements? (1 quality & corresponding systems)

A 
Simple systems w few moving parts in occupied spaces:
• VAV
• SINGLE DUCT / CONSTANT AIR VOL.
• HYDRONIC CONVECTORS
• Closed loop heat-pump
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6
Q

M06 - What mech. systems min. floor space required or maximizes floor to floor height? (2 qualities & 3 corresponding systems)

A 
1 - Local system w no ductwork or piping
• THROUGHWALL & PKG UNITS
2 - or min. size of ducts:
• INDUCTION
• HYDRONIC CONVECTORS
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7
Q

M07 - What mech. systems min. system noise? (1 quality and 2 corresponding systems)

A

Low air velocity:
• ANY ALL AIR SYSTEMS EXCEPT INDUCTION
• HYDRONIC CONVECTORS

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8
Q

M08 - What mech. systems min. visual obstructions? (1 quality & corresponding systems)

A

System w min. hardware in occupied spaces of building:
• ANY ALL AIR SYSTEMS
• Induction heating

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9
Q

M09 - What mech. systems will have minimal operating costs? (2 qualities & 4 corresponding systems)

A

1 - systems that convert fuel to heating & cooling energy w max efficiency:
• VAV
• SINGLE DUCT/CONSTANT AIR
• HYDRONIC CONVECTORS
2 - or system that draws on ambient heat of surrounding environment:
•CLOSED LOOP HEAT PUMP

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10
Q

M10 - What mech. systems will help avoid having a chimney in a building? (1 quality & 3 corresponding systems)

A

Electrically powered systems:
• ELECTRIC BOILER
• THROUGH WALL & PKG. UNITS
• CLOSED LOOP HEAT PUMPS

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11
Q

M11 -What material is best for a water supply pipe, and why? (4 reasons)

A 
Chop 11.24
Copper
pros: 
-high corrosion resistance
-good for potable water
-low hydronic friction
-small outside diameter
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12
Q

M12 - What HVAC mech. systems provide max. control over air quality & air velocity? (1 quality & 9 corresponding systems)

A 
All air heat systems:
• VAV
• VAV REHEAT
• VAV INDUCTION
• DUAL DUCT VAV
• CAV REHEAT
• MULTIZONE
• AIR-WATER INDUCTION
• FAN-COIL TERMINALS
• THROUGH WALL & PKG TERMINAL UNITS
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13
Q

M13 - What HVAC mech. systems are most likely to be used in an apartment? (4)

A

1 - Fan Coil
2 - Closed Loop
3 - Hydronic Convectors
4 - Pkg Term. Units or through wall units

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14
Q

M14 - What HVAC mech. systems are most likely to be used in an arena? (3)

A

1 - VAV*
2 - Single duct, CAV (constant air volume)*
3 - Fan Coil Terminals

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15
Q

M15 - What HVAC mech. systems are most likely to be used in a Auditoriums, Theatres? (3)

A

1 - VAV
2 - Single duct, CAV (constant air volume)
3 - Multizone

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16
Q

M16 - What HVAC mech. systems are most likely to be used in a Factories? (6)

A

1 - VAV*
2 - VAV Reheat
~3 - Single duct, CAV (constant air volume)*
4 - Multizone*
5 - Fan-Coil Terminals
~6 - Hydronic Convectors
(odd similarity to hospitals ~ indicate differences)

17
Q

M17 - What mech. systems are most likely to be used in a Hospitals? (6)

A 
1 - VAV
2 - VAV Reheat
~3 - Dual Duct, VAV 
~4 - CAV Reheat
5 - Multizone
6 - Fan-Coil Terminals
(odd similarity to hospitals ~ indicate differences)
18
Q

M18 - What mech. systems are most likely to be used in a Hotels/motels/dorms? (4)

A

1 - VAV*
2 - Fan Coil Terminals
3 - Closed Loop Heat Pumps
4 - PKG Terminal Units or through wall

19
Q

M18 - What mech. systems are most likely to be used in a Laboratories? (5)

A 
1 - VAV
2 - VAV Reheat
3 - Dual Duct, VAV 
4 - Single duct, CAV (constant air volume)
5 - CAV Reheat
20
Q

M19 - What mech. systems are most likely to be used in a Libraries? (2)

A

1 - VAV

2 - Multizone

21
Q

M20 - What mech. systems are most likely to be used in a nursing home? (3)

A

1 - VAV
2 - Fan-Coil Terminals
3 - Pkg Terminal Units or Through Wall

22
Q

M21 - What mech. systems are most likely to be used in an office? (4)

A

1 - VAV*
2 - VAV induction
3 - Multizone*
4 - Hydronic Convector

23
Q

M22 - What mech. systems are most likely to be used in a place of worship? (3)

A

1 - VAV
2 - Single duct, CAV (constant air volume)
3 - Hydronic Convectors

24
Q

M23 - What HVAC mech. systems are most likely to be used in a school? (3)

A

1 - VAV*
2 - VAV Reheat
3 - Fan-Coil Terminals

25
Q

M24 - What HVAC mech. systems are most likely to be used in a shopping center? (2)

A

1 - VAV*

2 - Multizone*

26
Q

M25 - What HVAC mech. systems are most likely to be used in a store? (2)

A

1 - VAV*

2 - Multizone*

27
Q

M26 - Describe a central system and it’s advantages. (5)

A

Heat is supplied or extracted by large equipment in one or more large mech rooms.

1 + generally quieter
2 + more energy efficient
3 + offer better IAQ (indoor air quality)
4 + lasts longer
5 + more convenient to service
28
Q

M27 Describe a local system and it’s advantages. (3)

A

Independent self-contained pieces of heating /cooling equipment located throughout build., one or more per room.

1 + cheaper to buy + install
2 + occupy less space in the building overall
(no mech room or ductwork)
3 + great for buildings with many small spaces which rqr individual temp. control

29
Q

True or false?

Not all plumbing fixtures require a trap.

A

False. all plumbing fixtures require a trap.

30
Q

What is a water hammer and how to avoid it?

A

Water-hammer: Concussion and banging noise can occur when a large volume of moving water is stopped abruptly.
To avoid: Air chambers are installed at fixture branches to prevent water hammer. The trap air elastically compresses and expands to equalize the pressure and flow of water in the system.

31
Q

Which pipes are larger? Those of the supplying system or of the sanitary system?

A

Sanitary system, they rely on gravity for its discharge. It is not a pressured system

32
Q

True or False? Electric heating allows control over the humidity.

A

False.

33
Q

Which one is not control by the HVAC system:

  1. Air circulation velocity
  2. Thermal equilibrium between the interior and the exterior
  3. Relative humidity
  4. Indoor Air Quality
  5. Ambient temperature
A
  1. Thermal equilibrium between the interior and the exterior
34
Q

What’s the difference between ERV and HRV?

A

ERV recuperate humidity on top of heat. HRV is only heat.

35
Q

What are the pros & cons of Variable air volume single duct? (4/3)

A 
\+Low operating cost
\+Good local ctrl
\+quiet
\+Low maintenance
-high cost
-space consuming
-many trades involved
36
Q

What are the pros & cons of VAV Dual duct? (4/2)

A 
\+ctrl of temperature
\+Ctrl of velocity
\+Quiet
\+Reduce duct size because of high velocity systems
-high capital cost
-High operation cost
37
Q

When to use a upfeed or downfeed systems

A

upfeed when building is <6storeys.

downfeed when building is > 6storeys. gravity to help provide appropriate pressure throughout the building

Exac (22 decks)

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