CEA Building Systems & Energy Efficiency 4

Question 1

Which type of lighting control provides the greatest energy savings in private offices?

Accepted Answer

Daylight harvesting with continuous dimming

Answer

Daylight harvesting with continuous dimming reduces electric light output in proportion to available daylight, providing savings throughout occupied hours rather than only when spaces are unoccupied.

Question 2

A chilled water system is being converted from a constant-flow to a variable primary flow system. The primary benefit is:

Accepted Answer

Reduced pump energy through variable speed operation

Answer

Variable primary flow eliminates the need for a primary/secondary decoupler and allows pump speeds to vary with load, drastically reducing pump energy via the affinity cube law.

Question 3

What is the Solar Heat Gain Coefficient (SHGC) of a window?

Accepted Answer

The fraction of incident solar radiation transmitted through the window as heat

Answer

SHGC represents the fraction of incident solar energy (both direct transmission and absorbed/re-emitted) that enters the building as heat; lower SHGC reduces cooling loads.

Question 4

An energy audit reveals that a compressed air system has a leak rate of 25%. What is the best first step to reduce this waste?

Accepted Answer

Conduct a leak detection survey and repair leaks

Answer

Leak detection (using ultrasonic detectors or soap solution) and prompt repair is the highest-priority, lowest-cost measure for compressed air systems, typically with paybacks under one year.

Question 5

In energy modeling, what is the purpose of a 'baseline' building model under ASHRAE 90.1 Appendix G?

Accepted Answer

To establish a code-compliant reference against which proposed design savings are measured

Answer

The Appendix G baseline model represents a code-minimum building and is used to calculate the percentage energy cost savings of the proposed design for programs like LEED.

(CEA) Certified Energy Analyst Practice Test

(CEA) Certified Energy Analyst Practice Test

CEA Building Systems & Energy Efficiency 4