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AEE Certified Energy Manager (CEM) Sample Questions:

1. A facility has the thermal cooling load profile shown in the table below. The utility rate tariff has an on-peak time-of-use billing period that begins at 10:00 a.m. and ends at 7:00 p.m. Calculate the storage capacity required for a load-shifting operating strategy, to make sure that no thermal cooling Is generated by the chiller during the on-peak utility rate period.

A) 72 GJ
B) 66 GJ
C) 48 GJ
D) 84 GJ

2. A building is conditioned by an air-conditioning and heating system. What technology can directly prevent simultaneous heating and cooling of the space?

A) Indoor air quality sensors
B) Variable air volume control
C) Derivative control
D) Setback thermostat
E) Air handling unit

3. The temperature in an unconditioned mechanical room is found to typically be around 23°C warmer than ambient air. If the air intake of an air compressor located in the mechanical room is routed through a nearby wall so that ambient air is fed directly to the air compressor's intake, what impact can be expected on the air compressor's energy requirement?

A) Decrease energy use by 3.8%
B) Increase energy use by 7.6%
C) Increase energy use by 3.8%
D) No measureable change in energy use
E) Decrease energy use by 7.6%

4. Which of the following best describes a thermally-light building?

A) A building filled with manufacturing and process equipment
B) An underground storage facility
C) A single-story office building where the load on the heating and cooling system is proportional to the outside air (ambient) temperature
D) A computer data center housing multiple internet server racks

5. Using the lumen method, calculate the number of luminaires (fixtures) required to light a room to 200 lux.
Each luminaire has 2 fluorescent lamps, 3,000 lumens per lamp. The room is 20 meters by 30 meters. The total light loss factor (LLF) is 0.70 and the luminaire coefficient of utilization (CU) is 0.80.

A) 48 luminaires
B) 24 luminaires
C) 36 luminaires
D) 12 luminaires
E) 60 luminaires

Solutions: