Sait Racm Hvac 313 3Rd: Psychrometrics Test (2023)

Front 1

Dry bulb temperature

Back 1

Temperature of the air as measured by an ordinary thermometer.

Front 2

Wet bulb temperature

Back 2

Temperature of the air as measured by an ordinary thermometer who’s glass ball is covered by a wet cloth

Front 3

Relative humidity

Back 3

The actual amount of moisture in the air compared to the total Maxximum moisture that the air could hold

Front 4

Grains of moisture

Back 4

The unit of measurement used to determine the amount of moisture in the air

7000 grains = 1 pound of water

Front 5

Psychrometric lines: dry-bulb lines

Back 5

Back (Definition)

Front 6

Psychrometric lines: wet-bulb lines

Back 6

Evaporative coolers follow these lines

Front 7

Psychrometric lines: dew point lines

Back 7

Back (Definition)

Front 8

Psychrometric lines: relative humidity lines

Back 8

Back (Definition)

Front 9

Psychrometric lines:

Grains of moisture scale

Back 9

Back (Definition)

Front 10

Psychrometric lines:

Specific volume lines

Back 10

Back (Definition)

Front 11

Psychrometric process lines:

Evaporative cooling

Back 11

Back (Definition)

Front 12

Psychrometric process lines:

Cooling and dehumidification

Back 12

Back (Definition)

Front 13

Psychrometric process lines:

Sensible cooling

Back 13

Back (Definition)

Front 14

Psychrometric process lines:

Dehumidifying/humidifying

Back 14

Back (Definition)

Front 15

Psychrometric process lines:

Chemical hydration

Back 15

Back (Definition)

Front 16

Psychrometric process lines:

Sensible heating

Back 16

Back (Definition)

Front 17

Psychrometric process lines:

Heating and humidifying

Back 17

Back (Definition)

Front 18

Standard air definition

Back 18

13.33 ft^3/lb spec. Vol.

70F dry bulb

29.99 HG absolute

14.69 psia

Front 19

How to use the sensible heat factor?

Back 19

(1)draw a line extending from your process line through the sensible heat factor

(2)If the factor is 0.72 then

72% sensible

28% latent

Front 20

Find capacity using standard air?

Back 20

Q(total)=4.5 x cfm x delta(h)

Front 21

Solve for capacity using mass flow rate?

Back 21

m (lbs / hr) = CFM x 1/(spec. Vol.) x 60 (min/hr)

Q(total) Btu/hr = m (lbs/hr) x delta h (Btu/lb)

Front 22

Bypass factor equation?

Back 22

(Dry temp Leaving- coil temp) / (Dry temp entering-coil temp)

Front 23

What is the barometric pressure of the carrier psychrometric chart?

Back 23

29.921 in HG (sea level)

(Look in the top left corner)

Front 24

Q(s)=1.08 x CFM x delta (T)

Is the same equation as

Q= M x C x Delta(T)

Back 24

True

Front 25

What is more dense?

wet air or dry air?

Back 25

Dry air.

Clouds float in the sky