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

2. A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.

A) 22,750 liters/minute
B) 48,250 liters/minute
C) 16,500 liters/minute
D) 8,250 liters/minute
E) 32,000 liters/minute

3. A heat pump water heater has an annual average coefficient of performance (COP) of 2.1 and heats water from 15°C to 50°C. Hot water use is 100 liters per day, 365 days/yr. The electricity cost is $0.10/kWh. What is the annual water heating cost? (The specific heat of water (C) is 4.2 kJ/kg-°C.)

A) $88.29/year
B) $52.20/year
C) $70.97/year
D) $64.66/year
E) $44.88/year

4. Insulation has a thermal conductivity of 0.04 Watt/(m-°C). What is the R-value for this insulation when it is 5- cm thick?

A) 1.25 (m²-°C)/Watt
B) 20 Watt/(m²-°C)
C) 0.8 (m²-°C)/Watt
D) 20 (m²-°C)/Watt
E) 2.20 Watt/m²

5. A facility owner is considering installing a new chiller. The installed project cost will be $300,000. The annual savings from the energy-saving project will be $45,000 for the 20-year life of the chiller. If an energy- service company requires a minimum 20% return on investment (pre-tax), will the energy-service company agree to finance this project?

A) Yes
B) No

Solutions: