Certified Energy Auditor Certification Energy Audit Data Analysis 3

Question 1

Which data visualization method is most appropriate for identifying energy consumption anomalies over a continuous 12-month period?

Accepted Answer

Time-series line graph of daily or monthly consumption

Answer

A time-series line graph reveals trends, anomalies, and seasonal patterns in energy data across a continuous time period.

Question 2

An auditor calculates a simple payback period of 4.2 years for a lighting retrofit. If the facility's minimum acceptable payback threshold is 3 years, what should the auditor recommend?

Accepted Answer

Present the project with a note that it does not meet the facility's financial criteria without further optimization

Answer

The auditor should present the measure honestly, noting it misses the threshold, and may suggest modifications (e.g., rebates, phased implementation) to improve the economics.

Question 3

When using interval meter data (15-minute readings) for demand analysis, what is the auditor primarily trying to identify?

Accepted Answer

Peak demand events and their coincidence with rate penalty periods

Answer

Interval data allows auditors to pinpoint exactly when peak demand occurs, enabling strategies to shift or curtail loads during utility peak pricing windows.

Question 4

A change-point model identifies a 'balance point temperature' of 58°F for a commercial building. What does this value represent?

Accepted Answer

The outdoor temperature below which heating energy consumption begins to increase

Answer

The balance point (change point) is the outdoor temperature at which the building transitions from free-cooling/heating mode to active conditioning, marking the start of weather-dependent energy use.

Question 5

What is the significance of a negative net present value (NPV) for an energy conservation measure?

Accepted Answer

The discounted future savings do not outweigh the initial investment cost

Answer

A negative NPV means the present value of all future energy savings, discounted at the chosen rate, is less than the upfront cost—the investment destroys value at that discount rate.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Energy Audit Data Analysis 3