Practice Test Geeks(CEA) Certified Energy Analyst Practice Test
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Lighting & HVAC Energy Analysis Flashcards

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

Read the first 7 Lighting & HVAC Energy Analysis flashcards as text

  1. A building energy model shows an annual cooling load of 500,000 ton-hours. If the chiller plant average efficiency is 0.65 kW/ton, what is the annual chiller electricity consumption?

    Answer: 325,000 kWh

    Annual energy = 500,000 ton-hr × 0.65 kW/ton = 325,000 kWh.

  2. What is the primary advantage of a thermal energy storage (TES) system in a commercial building?

    Answer: It shifts cooling energy use to off-peak hours to reduce demand charges

    TES systems generate cooling during off-peak hours and store it, reducing peak demand charges and taking advantage of lower off-peak electricity rates.

  3. According to ASHRAE 90.1, what automatic controls are required for exterior lighting in commercial buildings?

    Answer: Both time-of-day scheduling and photosensor (daylighting) controls

    ASHRAE 90.1 requires exterior lighting to be controlled by both a time-of-day schedule and a photosensor to ensure lights extinguish during daylight hours.

  4. Which of the following best describes 'infiltration' in the context of building HVAC energy loads?

    Answer: Uncontrolled air leakage through envelope gaps and cracks

    Infiltration is unintentional air leakage into or out of a building through gaps in the envelope, adding heating or cooling load depending on outdoor conditions.

  5. A photoelectric dimming system reduces lighting to 40% of full output when daylight is sufficient. The connected load is 10 kW and the system dims for 1,500 hours per year. How many kWh are saved annually compared to full-output operation?

    Answer: 9,000 kWh

    At 40% output, 60% of energy is saved; 10 kW × 0.60 × 1,500 hr = 9,000 kWh saved annually.

  6. What is 'chiller sequencing' and why is it important for energy efficiency?

    Answer: Staging multiple chillers on/off to match load and keep each unit near peak efficiency

    Chiller sequencing stages units so each chiller operates near full load where COP is highest, avoiding inefficient part-load operation of multiple chillers simultaneously.

  7. Which measure best reduces heating energy use in a VAV reheat system serving a large office building?

    Answer: Implementing supply air temperature reset based on outdoor air temperature

    Supply air temperature reset raises the supply air temperature during mild weather, reducing reheat energy and delivering less over-cooled air to terminal units.