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AEE Certified Energy Manager (CEM) Sample Questions:

1. A steam trap with a 6-mm orifice in an 0.8-MPa steam system has failed open. The steam system is pressurized 8.760 hours/yr. The steam cost is $15.00 /GJ. Using the table below, what is the annual cost of the vented steam through the failed steam trap? ignore any condensate return issues.

[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) $10,000/yr
B) $5,000/yr
C) $20,000/yr
D) $30,000/yr
E) $40,000/yr

2. Which of the following best describes a dead band in controls?

A) The delay in response of a system to a controlled change
B) The difference between a sensor variable and its set point
C) A value that has been assigned to a controlled variable
D) A system which changes the output of a controller based on how fast a variable is moving from or to a set point
E) A range around a set point with no change in state even though there is a change in sensor input

3. An energy-saving project costs $540,000. The project will have maintenance costs of $25,000 per year. The energy savings from the project are $160,000 per year. What is the simple payback of the project?

A) 4.0 years
B) 2.0 years
C) 3.0 years
D) 5.0 years

4. You are using a performance contract to finance the added cost of using more-efficient equipment in the construction of a new building. Which of the following International Performance Measurement and Verification Protocol (IPMVP) options would you use to verify annual energy savings?

A) Option C - Whole facility measurement
B) Option B - Retrofit isolation: all parameter measurement
C) Option D - Calibrated simulation
D) Option A - Retrofit isolation: key parameter measurement
E) Option E - Stipulated savings

5. A facility has the thermal cooling load profile shown in the table below. The utility rate tariff has an on-peak time-of-use billing period that begins at 10:00 a.m. and ends at 7:00 p.m. Calculate the storage capacity required for a load-shifting operating strategy, to make sure that no thermal cooling Is generated by the chiller during the on-peak utility rate period.

A) 84 GJ
B) 66 GJ
C) 48 GJ
D) 72 GJ

Solutions: