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AEE Certified Energy Manager (CEM) Sample Questions:

1. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 1,191 m³
B) 1,356 m³
C) 766 m³
D) 2,618 m³
E) 4,180 m³

2. A facility has a monthly peak power demand of 1,000 kW and an average power factor of 80%. The facility pays a demand charge of $7.50/kVA-month. What is the additional cost per month because the power factor is less than 100%?

A) $187/month
B) $1,875/month
C) $0/month
D) $2,244/month
E) $3,370/month

3. A facility has the thermal cooling load profile shown in the table below. The utility rate traffic has an no-peak time-of-use period that begins at 10:00 a.m ends at 7:00 p.m. What chiller capacity (output) is required for a load-leveling operating strategy?

[Question from the previous image, which was about chiller capacity for load leveling, but the table was missing]

A) 8.0 GJ/h
B) 5.0 GJ/h
C) 4.0 GJ/h
D) 7.0 GJ/h

4. What type of heat transfer is reduced by adding insulation to the inside surface of a wall?

A) Convection
B) Radiation
C) Conduction

5. What is a common cause of poor power quality?

A) Natural gas turbine power generation by utilities
B) Partially loaded induction motors
C) Synchronous motors
D) Electronic equipment, such as personal computers
E) Incandescent lighting

Solutions: