Certified Energy Auditor Certification Certified Energy Auditor HVAC Systems and Controls Questions and Answers 2

Question 1

What is the primary advantage of a variable air volume (VAV) system compared to a constant air volume (CAV) system in commercial buildings?

Accepted Answer

Reduced fan energy consumption at partial loads

Answer

VAV systems reduce fan energy by modulating airflow to match actual zone demands, significantly cutting energy use at partial loads.

Question 2

During an energy audit, which measurement is most critical for evaluating the efficiency of a chiller plant?

Accepted Answer

kW per ton of cooling

Answer

The kW/ton metric directly quantifies how much electrical energy the chiller consumes per unit of cooling output, making it the standard efficiency benchmark.

Question 3

What does an economizer cycle on a rooftop HVAC unit accomplish?

Accepted Answer

Uses outdoor air for free cooling when conditions permit

Answer

An economizer cycle introduces outdoor air to provide free cooling when the outside temperature and humidity are favorable, reducing mechanical cooling loads.

Question 4

Which control strategy is most effective for reducing energy consumption in a multi-zone HVAC system experiencing simultaneous heating and cooling?

Accepted Answer

Resetting supply air temperature based on zone demands

Answer

Supply air temperature reset reduces simultaneous heating and cooling by raising the supply air temperature when cooling demand is low, minimizing reheat energy.

Question 5

What is the recommended approach when an energy auditor discovers that building static pressure setpoints are significantly higher than necessary?

Accepted Answer

Lower the static pressure setpoint and verify zone comfort is maintained

Answer

Reducing an unnecessarily high static pressure setpoint directly lowers fan energy consumption while maintaining adequate airflow if comfort conditions are verified.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Certified Energy Auditor HVAC Systems and Controls Questions and Answers 2