Building Envelope and Lighting Flashcards
7 cards from real Certified Energy Auditor Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Building Envelope and Lighting flashcards as text
Which window property describes the fraction of incident solar radiation that passes through the glazing system as heat?
Answer: Solar heat gain coefficient (SHGC)
Solar heat gain coefficient (SHGC) measures the fraction of solar radiation admitted through a window as heat gain, on a scale of 0 to 1.
A building's thermal mass is most beneficial in which climate condition?
Answer: Hot-dry climates with large diurnal temperature swings
Thermal mass is most effective in hot-dry climates where large day-night temperature swings allow the mass to absorb heat during the day and release it during cooler nights.
What is the primary purpose of a vapor retarder in a wall assembly?
Answer: Control the diffusion of water vapor to prevent condensation within the assembly
A vapor retarder limits water vapor diffusion through the building envelope, preventing condensation within the wall assembly that can cause mold and structural damage.
In lighting energy audits, what does the term 'lamp lumen depreciation' (LLD) describe?
Answer: The decrease in lamp light output over its operating life
Lamp lumen depreciation (LLD) is the gradual reduction in light output that occurs as a lamp ages over its operating life, used in lighting design calculations.
Which insulation material has the highest R-value per inch?
Answer: Closed-cell spray polyurethane foam
Closed-cell spray polyurethane foam provides approximately R-6 to R-7 per inch, the highest thermal resistance per inch of common insulation materials.
An energy auditor measures a lighting system's efficacy at 85 lumens per watt. This metric quantifies:
Answer: The ratio of visible light output to total electrical power consumed
Luminous efficacy (lumens per watt) measures how efficiently a light source converts electrical energy into visible light output.
What does a blower door test primarily measure in a building energy audit?
Answer: Overall building air leakage rate
A blower door test depressurizes the building to measure the overall air leakage rate, typically expressed as ACH50 or CFM50.