Certified Energy Auditor Certification Certified Energy Auditor Energy Audit Data Analysis Questions and Answers 2

Question 1

When performing a regression analysis on building energy consumption, which variable is most commonly used as the independent variable?

Accepted Answer

Heating degree days

Answer

Heating degree days are the standard independent variable in energy regression analysis because they directly correlate with weather-driven energy consumption.

Question 2

What does a Coefficient of Determination (R-squared) value of 0.92 indicate in an energy baseline model?

Accepted Answer

92% of energy variance is explained by the model

Answer

An R-squared value of 0.92 means the regression model explains 92% of the variability in the energy consumption data.

Question 3

During an energy audit, you discover that a building's Energy Use Intensity (EUI) is 120 kBtu per square foot per year. Compared to the CBECS median for office buildings, this value is:

Accepted Answer

Above average, indicating potential for improvement

Answer

The CBECS median EUI for US office buildings is approximately 80-90 kBtu/sf/yr, so 120 kBtu/sf/yr is above average and suggests energy savings opportunities.

Question 4

Which statistical method is most appropriate for identifying abnormal energy consumption patterns in interval meter data?

Accepted Answer

CUSUM analysis

Answer

Cumulative Sum (CUSUM) analysis is specifically designed to detect shifts and trends in energy consumption data over time.

Question 5

When normalizing energy data for weather, what is the primary purpose of using a change-point model instead of a simple linear regression?

Accepted Answer

To account for different heating and cooling energy relationships

Answer

Change-point models capture the distinct relationships between energy use and temperature for heating and cooling modes, which a single linear regression cannot accurately represent.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Certified Energy Auditor Energy Audit Data Analysis Questions and Answers 2