FREE Certified Energy Auditor HVAC Systems Efficiency Questions and Answers

Question 1

Which HVAC system component typically offers the most significant energy savings potential through proper sizing and maintenance, impacting both heating and cooling efficiency?

Accepted Answer

Ductwork sealing and insulation

Answer

Air Handling Unit (AHU) fan motor

Answer

Thermostat controls

Answer

Refrigerant charging levels

Question 2

A facility manager is evaluating an existing constant-volume HVAC system for efficiency upgrades. The system serves zones with highly variable loads throughout the day. Which of the following strategies would likely yield the most substantial energy savings?

Accepted Answer

Upgrading to a variable frequency drive (VFD) for the supply fan.

Answer

Replacing standard MERV 8 filters with high-efficiency MERV 13 filters.

Answer

Increasing the chilled water supply temperature by 2°F.

Answer

Implementing a scheduled preventive maintenance program for coil cleaning.

Question 3

What is the primary benefit of implementing demand-controlled ventilation (DCV) in an HVAC system serving spaces with fluctuating occupancy?

Accepted Answer

Optimized outside air intake, leading to reduced heating and cooling loads.

Answer

Reduced compressor cycling and extended equipment life.

Answer

Increased indoor humidity control and comfort.

Answer

Lower static pressure requirements for the ductwork.

Question 4

When assessing the efficiency of a chiller, what metric is most commonly used to indicate its energy performance?

Accepted Answer

Integrated Part Load Value (IPLV)

Answer

Seasonal Energy Efficiency Ratio (SEER)

Answer

Energy Efficiency Ratio (EER)

Answer

Coefficient of Performance (COP)

Question 5

Which of the following would be the most effective strategy to improve the energy efficiency of an existing hydronic heating system without replacing major equipment?

Accepted Answer

Implementing boiler stack economizers.

Answer

Increasing the system's supply water temperature.

Answer

Reducing the pump head by adding more control valves.

Answer

Decreasing the flow rate through heat exchangers.

Question 6

A facility is experiencing high HVAC energy consumption. During an initial walkthrough, the energy auditor notices that several return air registers are partially blocked by furniture, and some supply air diffusers are dirty. Which efficiency principle is primarily being compromised?

Accepted Answer

Proper airflow and distribution.

Answer

Optimal refrigerant superheat/subcooling.

Answer

Effective heat transfer across coils.

Answer

Accurate temperature setpoint control.