ICC Energy and Sustainability Professionals 4

Question 1

A commercial building's Lighting Power Density (LPD) is expressed in which units?

Accepted Answer

Watts per square foot (W/ft²)

Answer

LPD is the installed lighting power divided by the floor area, expressed in watts per square foot, and is the primary metric used in energy codes to regulate lighting efficiency.

Question 2

What is the function of a demand-controlled ventilation (DCV) system in a commercial building?

Accepted Answer

Reduce outdoor air intake during periods of low occupancy based on CO2 sensing

Answer

DCV systems use CO2 sensors as a surrogate for occupancy to reduce outdoor airflow when spaces are partially occupied, saving both heating and cooling energy.

Question 3

Under IECC 2021 commercial requirements, which of the following systems requires an economizer unless a specific exception applies?

Accepted Answer

HVAC units serving spaces greater than 54,000 Btu/h cooling capacity in most climate zones

Answer

IECC 2021 Section C403.5 requires air economizers on cooling equipment above approximately 54,000 Btu/h (4.5 tons) in most climate zones to utilize free cooling from outdoor air.

Question 4

Which rating system is maintained by the U.S. Green Building Council and is commonly used alongside ICC codes for sustainable building certification?

Accepted Answer

LEED (Leadership in Energy and Environmental Design)

Answer

LEED, developed by the USGBC, is the most widely used green building rating system in the US and often complements IECC energy code compliance.

Question 5

In the context of IECC residential blower door testing, what is the maximum allowable air changes per hour at 50 Pascals (ACH50) for Climate Zone 3?

Accepted Answer

3 ACH50

Answer

IECC 2021 Table R402.4.1.2 sets a maximum of 3 ACH50 for Climate Zones 3 through 8 for homes verified by blower door testing.

(ICC) International Code Council Certified Professionals Practice Test

(ICC) International Code Council Certified Professionals Practice Test

ICC Energy and Sustainability Professionals 4