Humidification REAL Flashcards

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1
Q

Humidification

A

*Heat and Mass Transfer:
-Liquid to Vapor

*Increase humidity of air, Cool liquid water

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2
Q

Dehumidification

A

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

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3
Q

Cooling Water:
Humidification
Dehumidification

A

*Humidification
uses hot liquid

*Dehumidification
Uses cold liquid

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4
Q

Humidification Process:
Sensible heating / cooling

A

Constant humidity

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5
Q

Humidification Process:
Adiabatic

A

Constant wet bulb temperature

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6
Q

Humidification Process:
Heating and Humidifying

A

Increased humidity and absolute humidity

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7
Q

Psychrometry

A

Systematized knowledge of the properties of air and water.

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8
Q

Humidity

A

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

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9
Q

Relative Humidity

A

%RH=Pa*100%/Pa,sat

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10
Q

Percentage Humidity

A

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

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11
Q

Dew Point

A

Temperature at which the VAPOR just starts to CONDENSE

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12
Q

Bubble Point

A

Temperature at which the LIQUID just starts to BOIL

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13
Q

Humid Volume

A

Volume gas / Mass Dry Gas

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14
Q

Humid Heat

A

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.

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15
Q

Adiabatic Saturation Temperature

A

Temperature if the gas were saturated in an adiabatic process

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16
Q

Wet-Bulb Temperature

A

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

17
Q

Dry-Bulb Temperature

A

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

18
Q

Psychrometric charts

A

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

19
Q

What happens in a Spray Chamber?

A

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

20
Q

What happens in a Cooling Tower?

A

*Distributor distributes water on top
*Air fed on bottom

21
Q

COOLING TOWER TYPES:
Natural Draft

A

*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

22
Q

COOLING TOWER TYPES:
Induced Draft

A

*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

23
Q

COOLING TOWER TYPES:
Forced Draft

A

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

24
Q

Demister

A

Eliminate water droplets and mist from escaping the cooling tower

25
Q

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

A

spray chamber