AFE Energy Management & Sustainability 2

Question 1

A facilities engineer wants to benchmark a building's energy performance. Which metric is most commonly used for this purpose in the US?

Accepted Answer

Energy Use Intensity (EUI)

Answer

Energy Use Intensity (EUI) measures energy consumption per square foot per year and is the standard US benchmarking metric used by ENERGY STAR Portfolio Manager.

Question 2

Which of the following best describes a 'demand charge' on a commercial utility bill?

Accepted Answer

A charge based on the highest 15- or 30-minute peak power demand recorded

Answer

Demand charges are billed based on the peak power draw (kW) recorded during the billing period, typically measured in 15- or 30-minute intervals.

Question 3

In an HVAC system, what does the term 'economizer cycle' refer to?

Accepted Answer

Using outdoor air for free cooling when conditions allow

Answer

An economizer cycle uses cool outdoor air to provide free cooling to the building, reducing or eliminating mechanical refrigeration when outdoor conditions are favorable.

Question 4

A facility manager is evaluating two lighting retrofit options. Option A has a simple payback of 2 years; Option B has a simple payback of 4 years but a higher NPV over 10 years. Which statement is most accurate?

Accepted Answer

Option B may be the better long-term investment despite the longer payback

Answer

Simple payback ignores the time value of money and post-payback savings, so a higher NPV over the project life makes Option B potentially superior for long-term financial performance.

Question 5

What is the primary purpose of an energy audit's 'baseline' energy model?

Accepted Answer

To establish current energy consumption patterns for comparing ECM savings

Answer

The baseline model represents existing energy use so that the projected savings from energy conservation measures (ECMs) can be calculated as a measurable difference.

(AFE) Association for Facilities Engineering Certification Practice Test

(AFE) Association for Facilities Engineering Certification Practice Test

AFE Energy Management & Sustainability 2