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AEE Certified Energy Manager (CEM) Sample Questions:

1. Which of the following statements regarding refrigerants is NOT correct?
5ELECT THE CORRECT ANSWER

A) R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
B) R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact
C) R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
D) R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact
E) R-407C is a blended Hydro Fluoro Carbon or near Azeotropic mixture, and can be used as a replacement for R-22 in commercial applications

2. What type of heat exchanger is commonly built into AHU's or large RTU's, can be used to recover heat from exhaust air, and may cause cross-contamination between heat exchange fluids?
Select the Correct Answer

A) Heat pipe
B) Dessiccant heat wheel
C) Run-around coil
D) Heat pump
E) Plate and frame

3. A 1OO-kW packaged engine-generate combined heat and power (CHP) system has the specifications listed below. The CHP equipment operates fully loaded for 8.000 h/yr. What is the annual fuel cost for the ChP equipment?
CMP equipment specifications: Electrical output 100kw Electrical efficiency: 25% Thermal recovery efficiency: 50*6 Total CMP efficiency: 75% Additional information: Fuel cost: S3.S0/GJ Electricity cost S0.06/kWh Previous water heating efficiency:
8046 Mot water usage: 75,700 liters/day (21 *C temperature rise)
[The question from the previous image, which was about calculating the annual cost of heat loss through a wall, but had a discrepancy between the calculated cost and the provided answer choices]

A) $28,900/yr
B) $43,776/yr
C) $58,300/yr
D) $52,222/yr
E) $32,668/yr

4. 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) No
B) Yes

5. In a typical compressed air system, energy can be saved by which of the following actions?

A) Reducing the air distribution pipe size
B) Reducing the capacity of the compressed air receiver tanks
C) Decreasing supply air pressure
D) Move the inlet air filter to a warmer location
E) Raising the air pressure

Solutions: