Practice Test Geeks(CEA) Certified Energy Analyst Practice Test
← All CEA Flashcard Decks

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 facility manager wants to reduce lighting energy use by installing occupancy sensors in private offices. What percentage energy savings is typically achievable in private office spaces?

    Answer: 40–50%

    Occupancy sensors in private offices typically reduce lighting energy by 40–50% because offices are frequently unoccupied during the workday.

  2. Which HVAC system type uses a single refrigerant circuit to serve multiple indoor units, allowing individual zone control?

    Answer: Variable refrigerant flow (VRF) system

    VRF systems use one refrigerant circuit connected to multiple indoor fan-coil units, enabling independent zone temperature control.

  3. What does a Lighting Power Density (LPD) value measure?

    Answer: Watts of lighting power per square foot of floor area

    LPD is expressed in watts per square foot (W/ft²) and is the primary metric used by ASHRAE 90.1 to regulate interior lighting energy use.

  4. In HVAC energy analysis, what is the significance of the 'bin method'?

    Answer: It groups outdoor temperature hours into bins to estimate annual energy consumption

    The bin method divides annual outdoor temperature data into temperature bins, then calculates energy use at each bin to estimate total annual HVAC energy consumption.

  5. A T8 fluorescent lamp operates at 32 watts. An equivalent LED tube replacement operates at 18 watts. What is the percentage wattage reduction?

    Answer: 44%

    The reduction is (32−18) ÷ 32 = 14 ÷ 32 ≈ 43.75%, which rounds to approximately 44%.

  6. Which metric best describes the overall efficiency of a chiller plant including cooling tower, condenser pump, and chilled water pump energy?

    Answer: kW/ton

    kW/ton (kilowatts per ton of cooling) is the standard metric for evaluating chiller plant efficiency, encompassing all plant auxiliaries.

  7. What is 'daylighting' in the context of building energy analysis?

    Answer: Using natural light to offset electric lighting energy consumption

    Daylighting uses sunlight entering through windows or skylights to reduce electric lighting loads, often paired with daylight-responsive dimming controls.