Certified Energy Auditor Certification Certified Energy Auditor Certification-FREE Certified Energy Auditor Certification 1 — Questions and Answers
Question 1: According to ASHRAE Standard 211, which level of energy audit involves detailed engineering analysis of capital-intensive modifications and computer energy modeling?
- Level I – Walk-Through Analysis
- Level II – Energy Survey and Analysis
- Level III – Detailed Analysis of Capital-Intensive Modifications (Correct answer)
- Level IV – Continuous Commissioning
Correct answer: Level III – Detailed Analysis of Capital-Intensive Modifications
ASHRAE Standard 211 defines three audit levels. Level III is the most comprehensive, involving detailed engineering calculations, computer energy modeling, and investment-grade analysis specifically for capital-intensive measures.
Question 2: What does the Annual Fuel Utilization Efficiency (AFUE) rating measure in a heating system?
- The ratio of cooling output to electrical energy input over a season
- The percentage of fuel energy converted to usable heat over a typical heating season (Correct answer)
- The peak heating output capacity relative to installed burner size
- The number of heating degree days a system can reliably serve
Correct answer: The percentage of fuel energy converted to usable heat over a typical heating season
AFUE expresses as a percentage how much of the fuel's energy content is converted into usable space heat over an entire heating season, accounting for startup, shutdown, and off-cycle losses. A 95% AFUE furnace wastes only 5% of its fuel.
Question 3: What is the primary purpose of a duct blaster (duct pressurization) test during an energy audit?
- To measure the static pressure drop across air filters
- To quantify air leakage from the HVAC duct system to unconditioned spaces (Correct answer)
- To verify airflow balance between supply and return registers
- To determine the heating capacity of the air handler
Correct answer: To quantify air leakage from the HVAC duct system to unconditioned spaces
A duct blaster pressurizes the duct system to a standard pressure (typically 25 Pa) and measures the airflow needed to maintain that pressure, revealing how much conditioned air leaks into unconditioned spaces like attics or crawlspaces — a major source of energy waste.
Question 4: Which metric is used to evaluate the seasonal cooling efficiency of a central air conditioning system?
- COP – Coefficient of Performance
- AFUE – Annual Fuel Utilization Efficiency
- SEER – Seasonal Energy Efficiency Ratio (Correct answer)
- EER – Energy Efficiency Ratio
Correct answer: SEER – Seasonal Energy Efficiency Ratio
SEER (Seasonal Energy Efficiency Ratio) measures total cooling output in BTUs over a typical cooling season divided by total electrical energy consumed in watt-hours. It accounts for varying load conditions, unlike the single-condition EER rating.
Question 5: In energy auditing, heating degree days (HDD) data is primarily used to:
- Calculate the thermal resistance required for wall insulation
- Normalize and compare building energy consumption across different climate years (Correct answer)
- Determine the minimum outdoor design temperature for equipment sizing
- Estimate solar heat gain through south-facing windows
Correct answer: Normalize and compare building energy consumption across different climate years
Heating degree days quantify how cold a location is over time. Auditors use HDD to normalize utility bills across years with different weather, enabling fair comparison of pre- and post-retrofit energy consumption independent of climate variation.
Question 6: When calculating the simple payback period for an energy efficiency measure, which formula is correct?
- Annual Energy Savings ÷ Initial Installed Cost
- Initial Installed Cost ÷ Annual Energy Savings (Correct answer)
- (Initial Cost – Incentives) × Discount Rate
- Lifetime Energy Savings ÷ (Initial Cost + Maintenance Cost)
Correct answer: Initial Installed Cost ÷ Annual Energy Savings
Simple payback period equals the initial installed cost divided by the annual energy cost savings. It tells the auditor how many years it takes for cumulative savings to equal the upfront investment, though it does not account for the time value of money.
Certified Energy Auditor Certification Certified Energy Auditor Certification-FREE Certified Energy Auditor Certification 1
According to ASHRAE Standard 211, which level of energy audit involves detailed engineering analysis of capital-intensive modifications and computer energy modeling?