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AEE Certified Energy Manager (CEM) Sample Questions:

1. A refrigerant-to-water heat exchanger can be added to air-conditioning equipment to heat water using the waste heat in the vapor compression refrigerant cycle. Where is this type of heat exchanger located in the refrigerant loop?

A) After the condenser coil, before the thermal expansion valve
B) After the expansion valve, before the evaporator coil
C) After the evaporator coil, before the compressor
D) After the compressor, before the condenser coil

2. Which of the following is/are benefits of commissioning?

A) Ensures staff know how to operate a system as intended
B) Ensures a system is designed to operate as intended
C) Ensures staff know how to maintain a system as intended
D) Ensures a system is installed to operate as intended
E) All of the above

3. A facility replaces a natural gas heating system rated at 10,000 kJ/h and 80% efficiency with an electric heat pump rated at 10,000 kJ/h and a coefficient of performance (COP) of 2.3. Will this project also reduce the annual energy utilization index (EUI) for the facility?

A) No
B) Yes

4. 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) 2,618 m³
C) 766 m³
D) 4,180 m³
E) 1,356 m³

5. Exhaust gases from an industrial furnace flow through a heat-recovery steam generator, which generates medium-pressure steam. This steam is used in a steam turbine to generate shaft power driving a fan. Which type of combined heat and power (CHP) cycle does this process describe?

A) Combined cycle
B) Topping cycle
C) This cycle is not a combined heat and power system
D) Bottoming cycle

Solutions: