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COSC 326 - MEP II > Exam 1 - HVAC > Flashcards

Exam 1 - HVAC Flashcards

1
Q

What is the instrument that measures sound?

A

Decibel Meter

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2
Q

In order to produce a signal and be heard, a sound must be ____ dB above the current sound power level.

A

10 dB

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3
Q

“The solution to pollution is ____.”

A

Dilution

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4
Q

Odors are usually treated by adding _____ _____ into a space.

A

Outside Air

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5
Q

The most difficult odor to remove from HVAC systems is _______.

A

Tobacco Smoke

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6
Q

“____________” is a result of shutting down ventilation and preventing fresh outside air from entering a space.

A

Sick Building Sydnrome

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7
Q

VOC stands for _____.

A

Volatile Organic Compounds

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8
Q

Sick Building Syndrome affects occupants in which ways?

A

Occupants experience headaches, nausea, or respiratory problems attributed to stressful factors in the working environment.

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9
Q

Most people will report that they are comfortable in an interior building space with __ - ___ degree air temp, at a relative humidity of about ____%.

A
  • 68 to 75 degrees Fahrenheit

- 50%

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10
Q

About how many times does “peak design load” occur in an HVAC system per year?

A

1 time. The rest of the year is at part-load, or “shoulder load”.

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11
Q

What is the “Comfort Region”, in regards to psychometrics?

A

The Comfort Region is the transparent area on a psychometric chart which illustrates what the average person would consider “comfortable”. This can be taken to court to save your ass!

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12
Q

Define IAQ

A

Indoor Air Quality relates to the air experienced by the occupants of the building.

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13
Q

Required CFM for a smoking room.

A

60 CFM

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14
Q

This standard sets the minimum requirements for HVAC filter systems.

A

ASHRAE Standard 52

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15
Q

Construction sites range from ____ dB to _____ dB

A

80 dB to 90 dB

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16
Q

What are the components of “comfort”?

A
  1. Scents/Odors
  2. Temperature/Moisture
  3. Air Quality
  4. Noise/Sound
  5. Light
  6. Air Flow/Velocity
  7. Activity Level
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17
Q

At rest metabolic rate

A

300 Btu/h or 100 watts per person

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18
Q

This component of a cooling system compresses the refrigerant in its gaseous state.

A

Compressor

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19
Q

Condenses refrigerant gas to liquid.

A

Condenser

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20
Q

A device that causes a large pressure drop as the liquid refrigerant flows through it.

A

Expansion Device

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21
Q

Where cooling happens. Converts refrigerant to gas at a much colder temperature and a lower pressure.

A

Evaporator Coil or Evaporator

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22
Q

The maximum (or worst) design conditions.

A

“At Design”

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23
Q

A rule of thumb for calculating the design load for a cooling system.

A

1.0 cfm/sqft

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24
Q

Q = ?
cfm = ?
Delta T = ?

A

Q = Btu/h
cfm = Cubic Feet Per Minute of Air
Delta T = Temperature difference that is driving the load

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25
Q

Estimate the design cooling load for a 60,000 sqft office building. The supplied air is at 55 degrees and the return air is at 80 degrees.

A
  1. Q = 1.1 x cfm x Delta T
  2. cfm = 60,000 x 1.0 cfm/sqft = 60,000 cfm
  3. Delta T = 80 - 55 = 25 degrees
  4. Q = 1.1 x 60,000 x 25 = 1,650,000‬ Btu/hr
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26
Q

1 ton of cooling is equal to a cooling rate of _____ Btu/hr

A

12,000 Btu/hr

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27
Q

12,000 BTUh/ton means that a 6 ton unit would have a cooling capacity of ______ BTU.

A

72,000 BTU

28
Q

Convert 72,000 Btu/hr to Tons

A

(72,000 Btu/hr) x (1 ton/12,000 Btu/hr) = 6 Tons

29
Q

Rule-of-thumb for cooling load and sqft of space

A

500 sqft/ton

30
Q

Rule-of-thumb for cooling load and sqft of space for a residential space

A

1000 sqft/ton (provided that R-30 is in the roof and R-19 is in the walls.

31
Q

At Design Temperatures

A

Supply Air = 55 degrees

Return Air = 80 degrees

32
Q

Energy transfer through fluid motion, in both gasses and liquids.

A

Convection

Ex. Heat “waves” shimmering off of hot pavement

33
Q

Energy transfer because of a material’s property

A

Conduction

Ex. Touching a hot iron or stove

34
Q

Energy transfer through electromagnetic waves (Magic lol)

A

Radiation

Ex. Standing near a campfire

35
Q

The most visible (bright or white) component of an infrared image attributes mostly to the ______ load of the photographed area.

A

Cooling Load

36
Q

The function of Low-E Glass

A

Low-E glass does not re-emit the heat it absorbs.

37
Q

This instrument can measure the Wet Bulb Global Temperature.

A

Heat Stress Meter

38
Q

The higher the WGBT, the more frequently workers should take a rest.
True or False?

A

True, baby boy

39
Q

What causes condensation?

A

Any surface with a temperature cooler than the dew point of the surrounding air will cause condensation to occur on that surface.

Therefore, HVAC systems “dehumidify” an area by operating a heat exchanger surface below the dewpoint of the surrounding air.

40
Q

The movement of energy through the removal of or addition of moisture in the air.

A

“Latent Heat Transfer”

41
Q

The cooling of the air, with no removal or addition of moisture in the air conditioning process.

A

“Sensible Cooling”

Relative humidity still changes during this process.

Ex. Chilled beam system

42
Q

Cooling of the air through the EVAPORATION of water

A

Evaporative cooling

Ex. Humans and their nasty, sticky, sweat. MMMMM so GoOoOOD

43
Q

Why insulate chilled water piping?

A

To prevent condensation

44
Q

Define enthalpy

A

Enthalpy is how much energy is in the air. Temperature and moisture are included.

45
Q

This refrigerant replaced R-22

A

R-410a

46
Q

Typical car refrigerant

A

R-134a

47
Q

Estimated temperature entering an expansion valve

A

105 degrees Fahrenheit

48
Q

Estimated temperature leaving an expansion valve

A

45 degrees Fahrenheit

49
Q

The “killer” of electrical components

A

Heat

50
Q

SEER

A

Seasonal Energy Efficient Ration

A rating for cooling units

51
Q

Ice on an evaporator coil would be a symptom of ______.

A

Low refrigerant

52
Q

Wet Bulb Temperature measures _____, whereas Dry Bulb Temperature measures ______.

A
  • Humidity

- Regular temperature

53
Q

The 0th Law of Thermodynamics

A

“There is no temperature change without the exchange of energy.”

54
Q

A WBGT of 82 or greater would not be good for high activity levels.

True or false

A

True

55
Q

The curve on the Psychometric Chart is known as the _________.

A

Saturation Line

56
Q

Characteristics of Low-E Glass

A
  1. Prevents heat/light transfer

2. Non-reflective

57
Q

A net-zero building, in theory, would ______.

A

Use as much energy as it creates

58
Q

There are ____ branch circuits on a line diagram

A

0

59
Q

A line diagram represents ______.

A

The distribution on power throughout a building

60
Q

IPD

A

Integrated Project Delivery

61
Q

This type of contract requires that every party signs, a split contingency between all parties, and a joint sharing of risks and rewards.

A

IPD

62
Q

Just-In-Time delivery is a characteristic of CPM

True or False

A

False.

Just-In-Time delivery is an element of LPS

63
Q

CPM vs LPS

A

CPM

  • Detailed planning
  • High resource utilization
  • Schedule is forced onto people

LPS

  • Plan incrementally
  • Daily adjustments
  • Journey men know duration of activities
  • Daily Huddles
  • Trust
  • JIT Delivery
64
Q

The number of skilled laborers is in a(n) ______.

A

Decline

This affects self-perform the most.

65
Q

The two acronyms addressing methods of labor risk management are _____ and ______.

A
  • TIMMES (Resources)

- DOWNTIME (Waste)

66
Q

An example of modular construction could be _____.

A

The recently built Chinese hospital.

Data centers.

COSC 326 - MEP II (3 decks)

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