Certified Energy Auditor Certification HVAC Systems and Performance 2

Question 1

What does the Energy Efficiency Ratio (EER) measure in a cooling system?

Accepted Answer

BTU of cooling output per watt of electrical input at a fixed condition

Answer

EER is the ratio of cooling capacity in BTU/hr to power input in watts at a single standard test condition (95°F outdoor, 80°F/67°F indoor).

Question 2

In a variable air volume (VAV) system, what component modulates airflow to individual zones?

Accepted Answer

VAV terminal box with damper

Answer

A VAV terminal box contains a damper that modulates to deliver the airflow required to maintain zone setpoint temperature.

Question 3

A chiller's condenser water leaving temperature is 90°F. Lowering it to 85°F will most likely have what effect on chiller efficiency?

Accepted Answer

Efficiency improves because condenser pressure drops

Answer

Reducing condenser water temperature lowers condensing pressure, reducing compressor work and improving chiller kW/ton.

Question 4

Which ASHRAE Standard defines energy efficiency requirements for commercial HVAC equipment?

Accepted Answer

ASHRAE 90.1

Answer

ASHRAE 90.1, 'Energy Standard for Buildings Except Low-Rise Residential Buildings,' sets minimum efficiency requirements for HVAC, lighting, and envelope.

Question 5

What is the primary purpose of a heat recovery ventilator (HRV) in a building?

Accepted Answer

Recover heat from exhaust air to pre-condition incoming fresh air

Answer

An HRV transfers heat from exhaust air to incoming outdoor air, reducing the energy needed to condition fresh ventilation air.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification HVAC Systems and Performance 2