EMP Energy Efficiency & Conservation Techniques 2

Question 1

A facility manager installs occupancy sensors in conference rooms that were previously lit 24/7. The rooms are occupied only 30% of the time. What is the approximate energy savings percentage for lighting in those rooms?

Accepted Answer

70%

Answer

Sensors eliminate lighting during the 70% of time rooms are unoccupied, saving approximately 70% of lighting energy.

Question 2

Which metric is used to measure the energy efficiency of a chiller system?

Accepted Answer

Coefficient of Performance (COP)

Answer

COP measures the ratio of cooling output to electrical energy input for chiller systems.

Question 3

An energy manager wants to reduce peak demand charges. Which strategy is MOST effective for demand-side management?

Accepted Answer

Load shifting using thermal energy storage

Answer

Thermal energy storage shifts cooling loads to off-peak hours, directly reducing peak demand charges.

Question 4

What is the purpose of a Variable Frequency Drive (VFD) installed on a pump motor?

Accepted Answer

To match motor speed to actual load requirements, reducing energy waste

Answer

VFDs adjust motor speed to match actual demand, reducing energy consumption significantly at partial loads.

Question 5

A building's air handling unit operates at constant volume. Converting it to variable air volume (VAV) typically reduces fan energy by what percentage range?

Accepted Answer

30–60%

Answer

VAV systems reduce fan energy by 30–60% because fan power varies with the cube of airflow volume.

(EMP) Energy Management Professional Practice Test

(EMP) Energy Management Professional Practice Test

EMP Energy Efficiency & Conservation Techniques 2