Humidification REAL

Question 1

Humidification

Answer 1

*Heat and Mass Transfer:
-Liquid to Vapor

*Increase humidity of air, Cool liquid water

Question 2

Dehumidification

Answer 2

*Opposite of humidification
*Condensing out the water vapor from the air to decrease its humidity.

Question 3

Cooling Water:
Humidification
Dehumidification

Answer 3

*Humidification
uses hot liquid

*Dehumidification
Uses cold liquid

Question 4

Humidification Process:
Sensible heating / cooling

Answer 4

Constant humidity

Question 5

Humidification Process:
Adiabatic

Answer 5

Constant wet bulb temperature

Question 6

Humidification Process:
Heating and Humidifying

Answer 6

Increased humidity and absolute humidity

Question 7

Psychrometry

Answer 7

Systematized knowledge of the properties of air and water.

Question 8

Humidity

Answer 8

S=Pa/Pb = Pa/ (P-Pa)

Question 9

Relative Humidity

Answer 9

%RH=Pa*100%/Pa,sat

Question 10

Percentage Humidity

Answer 10

%H = H/H,max
=100%*(Pa/P-Pa) / (Pa,sat/P-Pa,sat)

Question 11

Dew Point

Answer 11

Temperature at which the VAPOR just starts to CONDENSE

Question 12

Bubble Point

Answer 12

Temperature at which the LIQUID just starts to BOIL

Question 13

Humid Volume

Answer 13

Volume gas / Mass Dry Gas

Question 14

Humid Heat

Answer 14

Heat energy necessary to increase the temperature of a unit mass of gas plus whatever vapor it may contain by 1°C or 1°F.

Question 15

Adiabatic Saturation Temperature

Answer 15

Temperature if the gas were saturated in an adiabatic process

Question 16

Wet-Bulb Temperature

Answer 16

Temperature of air with small amount of water contacted with continuous amount of gas

Question 17

Dry-Bulb Temperature

Answer 17

Actual gas (air) temperature as measured by a dry-bulb thermometer

Question 18

Psychrometric charts

Answer 18

Plots of humidity, temperature, enthalpy, and other useful parameters of a gas-vapor mixture

Question 19

What happens in a Spray Chamber?

Answer 19

*Water sprayed into air
*Evaporation of some water cools down the remaining water

Question 20

What happens in a Cooling Tower?

Answer 20

*Distributor distributes water on top
*Air fed on bottom

Question 21

COOLING TOWER TYPES:
Natural Draft

Answer 21

*Uses natural convection
*BUOYANCY: Differences in air density create specific patterns of movement.
*IN: Cold Dry Air
Hot Water
*OUT: Warm Wet Air
Cooled Water

Question 22

COOLING TOWER TYPES:
Induced Draft

Answer 22

*FANS IN WARM OUTLET
*Use mechanical means (fans, etc.) to move air through the tower.
*Warm air inducted OUT of tower = no chance of recirculation

Question 23

COOLING TOWER TYPES:
Forced Draft

Answer 23

*FANS IN COLD INLET
*Take in cold dry air at high velocities
*Used in indoor facilities

Question 24

Demister

Answer 24

Eliminate water droplets and mist from escaping the cooling tower

Question 25

The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is ___

Answer 25

spray chamber