Certified Energy Auditor Certification Building Envelope and Lighting 4

Question 1

Which factor most significantly reduces the effective R-value of a fiberglass batt insulation in a stud wall assembly?

Accepted Answer

Thermal bridging through wood studs

Answer

Wood studs have a much lower R-value than cavity insulation, and thermal bridging through studs typically reduces a wall's effective R-value by 15-25% compared to the cavity R-value alone.

Question 2

An energy auditor finds that a facility's T8 fluorescent lamps operate at 3,000 hours per year and consume 32W each. If replaced with 18W LED tubes producing equal lumens, what is the annual kWh savings per lamp?

Accepted Answer

42 kWh

Answer

Power reduction = 32W - 18W = 14W; annual savings = 14W × 3,000 hrs ÷ 1,000 = 42 kWh per lamp per year.

Question 3

What is the primary function of a low-emissivity (low-e) coating on window glass?

Accepted Answer

Reflect long-wave infrared radiation to reduce radiant heat transfer

Answer

Low-e coatings reflect long-wave infrared radiation, significantly reducing radiant heat transfer between the glazing surface and building interior, improving window U-factor.

Question 4

A daylight harvesting control system dims electric lights in response to:

Accepted Answer

Available natural daylight measured by a photosensor

Answer

Daylight harvesting systems use photosensors to measure ambient light levels and automatically dim electric lighting to maintain target illuminance while maximizing use of natural daylight.

Question 5

What does the fenestration-to-wall ratio (FWR) describe in building energy analysis?

Accepted Answer

The percentage of gross exterior wall area that is glazed

Answer

Fenestration-to-wall ratio (FWR) is the ratio of total glazed area to gross above-grade exterior wall area, a key metric in energy codes that limits heat gain/loss through windows.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Building Envelope and Lighting 4