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Build my nuts in your face > environmental comfort > Flashcards

environmental comfort Flashcards

1
Q

variables that affect comfort in building?

A

-room temp
- airflow
- humidity
- radiation
- indoor air quality

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2
Q

what temps does body feel most comfortable?

A
  • winter: 22.2 - 25.5
  • summer: 22.2 - 24.4
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3
Q

what is humidity?

A
  • moisture in the air
  • high humidity less heat absorbed from body
  • low humidity more heat absorbed from body
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4
Q

airflow?

A
  • rate of air motion
  • increased air flow increases heat evaporation from body keeping it cool
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5
Q

radiation?

A
  • heat flows from hot to cold surface
  • comfort can be increases by directing warm air towards cold surfaces, why most heating elements are located under windows
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6
Q

HVAC designed for?

A
  • thermal conditioning
  • adequate count of outdoor air
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7
Q

two types of humidity?

A
  • absolute humidity
  • relative humidity
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8
Q

dry air?

A

no water vapour

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9
Q

moist air?

A

some water vapour

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10
Q

saturated air?

A

max amount of water vapour

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11
Q

how is relative humidity measured?

A

hydrometer

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12
Q

how to dehumidify air?

A

cool it

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13
Q

what is the dew point (DPT)

A

temp of air/water vapour mixture when fully saturated

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14
Q

frost point temp?

A

when dew point is below freezing creating frost instead of dew

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15
Q

condensation?

A

process of removing liquid from air

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16
Q

effect of temp on humidity

A
  • moisture holding capacity
  • warm air holds more than cold air
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17
Q

dry bulb temp (DBT)

A

temp of the mixture of air and moisture at rest, measured with thermometer

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18
Q

wet-bulb temp?

A
  • by comparing the dry and wet bulb temperatures we can determine the temp and humidity of air
19
Q

specific volume?

A

ratio of unit volume of air per weight of dry air

20
Q

enthalpy

A

quantity of heat contained in air under specific conditions

21
Q

psychrometric chart

A

graphical representation of thermodynamic properties of moist air

22
Q

what is relative humidity

A

ratio of actual water to max amount of water at the same temp and pressure

23
Q

what two ways does air contain thermal energy

A
  • temperature
  • water vapour
24
Q

sensible heat?

A

heat is associated with temp change

25
Q

temperature is a measurement of what

A

sensible heat

26
Q

what are all the material states

A
  • solid
  • liquid
    -gas
27
Q

latent heat?

A

release or storage of heat associated with change in phase of substance

28
Q

water vapour is measurement of what?

A

also latent heat

29
Q

heating cooling is change of what

A

change od sensible heat

30
Q

humidification and dehumidification is change of what

A

is a change of latent heat

31
Q

sensible heating (cooling)

A

when temp of air water mixture is raised, but moisture remains the same

32
Q

cooling and dehumidification

A

lowering temp and humidity ratio

33
Q

evaporating cooling

A

sensible heat converts to latent heat in the added vapour

34
Q

heating and humidification

A
35
Q

desiccant dehumidification

A

chemical or physical absorption of water vapour to dehumidify air

36
Q

what fluids does the HVAC system carry to transport heat and cold

A
  • air
  • water
  • steam
  • refrigereant
37
Q

what is heat measured in

A

british thermal units (BTU)

38
Q

what is 1 btu

A

the heat to raise 1lb of water 1F

39
Q

heating loads?

A

how much heat is lost and must be made up

40
Q

cooling loads?

A

how much heat must be removed

41
Q

what is critical condition design

A
  • outside weather
  • solar effects
  • inside temp
  • humidity
  • status of building operations
42
Q

critical deasign for heating occurs when

A

with super cold weather

43
Q

critical design for cooling is when

A

with super hot conditions

44
Q

what does the amount of ventillation depend on?

A
  • type of occupancy
  • number of occupants

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