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Cooling and Environmental Control Flashcards

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

Read the first 7 Cooling and Environmental Control flashcards as text

  1. What is the main advantage of a waterside economizer over an airside economizer in a data center?

    Answer: It does not introduce outside contaminants into the data center

    Waterside economizers cool water via a cooling tower or dry cooler and then use that water in the chiller loop, keeping outside air out of the IT space.

  2. A data center manager notices the return air temperature to the CRAC units is unusually low. What does this most likely indicate?

    Answer: Excessive cold air bypass (short-cycling)

    Low return air temperature indicates cold supply air is bypassing IT equipment and returning directly to the cooling unit without absorbing heat.

  3. In immersion cooling for data centers, what fluid is typically used to submerge IT equipment?

    Answer: Dielectric fluid

    Dielectric (electrically non-conductive) fluids are used in immersion cooling so the liquid can safely contact live electronic components.

  4. What is the effect of raising the cold aisle temperature set point from 65°F to 75°F in a modern data center with ASHRAE A1-rated equipment?

    Answer: Chiller efficiency improves, reducing energy consumption

    A higher cold aisle set point allows chillers to operate at warmer chilled water temperatures, which significantly improves chiller COP and saves energy.

  5. Which organization publishes the widely adopted thermal guidelines (A1–A4 classes) for data center IT equipment?

    Answer: ASHRAE

    ASHRAE's Technical Committee 9.9 publishes the thermal guidelines, including the A1–A4 equipment classes used globally.

  6. What is the primary risk of allowing relative humidity to drop below 20% in a data center?

    Answer: Increased electrostatic discharge (ESD) risk

    Very low humidity increases static charge buildup, raising the risk of electrostatic discharge that can damage sensitive electronic components.

  7. A data center operator wants to maximize free cooling hours annually. Which geographic or site factor has the greatest influence?

    Answer: Local climate and annual dry-bulb temperature distribution

    The local climate's dry-bulb temperature distribution determines how many hours per year outdoor conditions are cool enough to support economizer operation.