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Psychrometrics and Humidity Control Flashcards

7 cards from real Flood Restoration practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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

    Answer: Grains per pound (GPP)

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

  2. Relative humidity (RH) is best defined as:

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

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

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

    Answer: It increases, allowing more moisture to evaporate from materials

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

  4. The dew point temperature is defined as:

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

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

  5. A refrigerant dehumidifier removes moisture from air by:

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

    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.

  6. According to IICRC S500 guidelines, what relative humidity level should be maintained in the structure to inhibit secondary mold growth during drying?

    Answer: Below 60% RH

    Maintaining indoor RH below 60% deprives mold spores of the moisture they need to germinate and colonize building materials.

  7. Psychrometric charts are primarily used in flood restoration to:

    Answer: Determine the relationship between temperature, relative humidity, dew point, and grains per pound

    Psychrometric charts graphically display the interdependencies of dry bulb temperature, wet bulb temperature, relative humidity, dew point, and absolute moisture content.