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Worksheetsdehumidification review
Total questions: 25
Worksheet time: 13mins
? Is defined as removal of moisture vapor from air to lower it dew point.
Dehumidification
Vapor absorption
Heat induction
None
The four elements of corrosion cell are
Anode, cathode
Metallic pathway, and electrolyte
All
None
Steel exposed to high humidity, high levels of atmospheric pollution, such as industrial areas, sea coast will corrode
15 to 20x faster
2 to 5x faster
10 to 15x faster
Triple the rate
Warm air can contain or hold more? Then cold air.
Moisture
Heat
Dew point
All
Heating air does not change moisture content but help it ability to hold ? Moisture vapor
More
Less
None
Hall
When air is cold it ability to hold moisture is reduce thus higher
Relative humidity
Dew point
Both
The temperature to which the air has been cooled enough to be saturated and capable of producing dew is called the?
Dew low
Dew high
Dew point
None
Most coatings cannot be applied when relative humidity is greater then ?
85%
90 %
95%
80%
Solvent entrapment that causes blistering or peeling of coating is caused by
High Relative humidity
Low relative humidity
50 % relative humidity
85% relative humidity
Solvent can not evaporate at 100% relative humidity because
100% relative humidity can not hold any more evaporation
Solvent does not evaporate
False question
At 50 % or below relative humidity corrosion virtually
Ceases
Doubles
Triples
None
The air next to the steel is called the
None
Substrate atmospheric
Steel air
Boundary layer
Two ways to reduce the boundary layer
Increase surface temp and reduce moisture by dehumidification
Ventilation and heat
Reduce surface temp and cool air
Increase surface temp and heat air
Radiant heat is one method to
Heat surfaces
Remove mill scale
Increase relative humidity
All
Gas burning direct heaters can be unsafe and may be counter productive due to
Produces moisture
Bad smell
Improper heat methods
All
Refrigeration dehumidification is
Common and economical
Unused due to condition
All
None
How refrigeration dehumidification works
Ambient air circulates over a system of refrigeration coils, coils set to temp lower then dew point, air chills and reaches saturation, condensation occurs, condensation is collected and removed, dry heat add to air flow after cool to adjust humidity
Air is cooled then pumped into heating room
None
All
Refrigeration dehumidification is effective
Warm and high moisture
Cold and high dew point
Above 0 degrees
None
? Are substances that naturally have a high affinity for water
Desiccants
Salts
Dehumidification
All
Common liquid desiccant is
Sulfuric acid
Hydrogen peroxide
Both
None
Liquid desiccant are called
Absorbent desiccant
Adsorbent desiccant
None
All
Solid desiccant are called
Absorbent desiccant
Adsorbent desiccant
Both
None
Rotating bed with silica gel, in drum or wheel rotated 10 to 12 revolutions per hr, use in dehumidification process
Rotary honeycomb dehumidifier
Rotary
Both
None
Dehumidification equipment commonly used for
Tank lining
Offshore platforms
Marine
Bridges
Dehumidification equipment can be helpful
Tropical climates
High temperatures
High moisture
All
