Flood Restoration Psychrometrics and Humidity Control

Question 1

In psychrometrics, which measurement expresses the actual amount of moisture in the air regardless of temperature?

Accepted Answer

Grains per pound (GPP)

Answer

Grains per pound (GPP) is an absolute measure of water vapor in air, unlike relative humidity which changes value as temperature changes.

Question 2

Relative humidity (RH) is best defined as:

Accepted Answer

The ratio of actual moisture in air to the maximum it can hold at that temperature

Answer

RH expresses moisture content as a percentage of the air's maximum water-holding capacity at a specific temperature.

Question 3

As indoor temperature increases during structural drying, what happens to the air's capacity to hold moisture?

Accepted Answer

It increases, allowing more moisture to evaporate from materials

Answer

Warmer air can hold significantly more water vapor, which is why raising room temperature accelerates the evaporation and drying process.

Question 4

The dew point temperature is defined as:

Accepted Answer

The temperature at which air must be cooled to reach 100% saturation and condensation begins

Answer

The dew point is the temperature at which air becomes fully saturated (100% RH) and water vapor begins to condense into liquid.

Question 5

A refrigerant dehumidifier removes moisture from air by:

Accepted Answer

Cooling the air below its dew point to condense moisture onto cold coils, then reheating it

Answer

Refrigerant dehumidifiers cool incoming air below the dew point so moisture condenses on evaporator coils, then the now-drier air is reheated before being exhausted back into the space.

Flood Restoration Practice Test

Flood Restoration Practice Test

Flood Restoration Psychrometrics and Humidity Control