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AEE Certified Energy Manager (CEM) Sample Questions:

1. A cooling tower delivers 29°C water to a central chilled water plant. The cooling tower is capable of delivering water to the chilled-water plant with a 6°C approach temperature to the ambient wet bulb temperature. Using this information, what type of control strategy would you recommend be added to the cooling tower operation to save additional energy?

A) Chiller demand limiting
B) Static-pressure reset
C) Condenser-water temperature reset
D) Chilled-water temperature reset

2. When comparing two similar facilities, you see that the facility with newer, higher-efficiency equipment has a higher energy-use index [EUI] (kJ/m²-yr). What might be the cause?

A) The facility with the higher efficiency equipment should have a higher EUI
B) The facility with the higher EUI is in need of commissioning
C) The facility with the higher EUI requires a supervisory control and data acquisition (SCADA) system
D) The facility with the lower EUI is in need of commissioning
E) The facility with the lower EUI requires a performance contract

3. An air-conditioning system at full load is rated at 70-kW (thermal cooling) and has a coefficient of performance (COP) of 4.1. What is the electrical load at full load?

A) 70.0 kW
B) 35.0 kW
C) 46.7 kW
D) 17.1 kW
E) 23.3 kW

4. The International Performance Measurement and Verification Protocol (IPMVP) has how many categories (method options) to determine the performance of an energy- or water-consuming system?

A) 2 Options
B) 4 Options
C) 5 Options
D) 6 Options
E) 3 Options

5. A gas-fired boiler is operating with 31.9% excess air. A feedwater economizer is used to reduce the stack temperature rise from 310°C to 160°C. Using the natural gas combustion efficiency tables in your workbook, find the energy savings from the economizer as a percentage of historical fuel consumption.

A) 7.1%
B) 9.3%
C) 5.8%
D) 3.1%
E) 1.2%

Solutions: