Certified Energy Auditor Certification Certified Energy Auditor Building Envelope and Lighting Questions and Answers 2 — Questions and Answers
Question 1: What is the primary purpose of conducting a blower door test during a building envelope assessment?
- To measure the building's air infiltration rate (Correct answer)
- To test the HVAC system's airflow capacity
- To determine the insulation R-value of walls
- To evaluate window solar heat gain coefficients
Correct answer: To measure the building's air infiltration rate
A blower door test pressurizes or depressurizes a building to quantify the total air leakage rate through the envelope.
Question 2: Which lighting metric measures the total luminous flux emitted per watt of electrical power consumed?
- Color Rendering Index (CRI)
- Luminous efficacy (Correct answer)
- Foot-candle level
- Correlated Color Temperature (CCT)
Correct answer: Luminous efficacy
Luminous efficacy, expressed in lumens per watt, indicates how efficiently a light source converts electrical energy into visible light.
Question 3: An energy auditor finds that a commercial building's window-to-wall ratio exceeds 40%. What is the most likely energy impact?
- Reduced heating loads due to increased solar gain
- Increased both heating and cooling loads from thermal losses and solar gains (Correct answer)
- Decreased lighting energy use that fully offsets envelope losses
- No significant impact if windows are double-paned
Correct answer: Increased both heating and cooling loads from thermal losses and solar gains
Excessive glazing area increases conductive heat loss in winter and solar heat gain in summer, raising both heating and cooling energy consumption.
Question 4: What does the term 'thermal bridging' refer to in building envelope analysis?
- Heat transfer through insulation gaps caused by structural elements with higher conductivity (Correct answer)
- The use of thermal mass to store and release heat
- Air leakage through unsealed penetrations in the building shell
- Radiant heat transfer between adjacent roof surfaces
Correct answer: Heat transfer through insulation gaps caused by structural elements with higher conductivity
Thermal bridging occurs when highly conductive materials such as steel studs or concrete slabs bypass insulation layers, creating localized paths for heat flow.
Question 5: Which lighting control strategy is most effective for reducing energy use in a daylit open-plan office?
- Time-clock scheduling with fixed on/off times
- Continuous dimming with photosensor controls (Correct answer)
- Manual switches at each workstation
- Occupancy sensors only at building entries
Correct answer: Continuous dimming with photosensor controls
Continuous dimming with photosensors automatically adjusts electric lighting output based on available daylight, providing the greatest energy savings in daylit spaces.
Question 6: When evaluating roof insulation during an energy audit, which factor most significantly affects heat flow through a low-slope commercial roof assembly?
- The color of the interior ceiling finish
- The thermal resistance (R-value) of the insulation layer (Correct answer)
- The thickness of the roof decking material
- The type of fasteners used for the membrane
Correct answer: The thermal resistance (R-value) of the insulation layer
The R-value of the insulation layer is the dominant factor controlling conductive heat transfer through the roof assembly.
Certified Energy Auditor Certification Certified Energy Auditor Building Envelope and Lighting Questions and Answers 2
What is the primary purpose of conducting a blower door test during a building envelope assessment?