CCP Building Envelope & Energy Audit 2

Question 1

During a thermographic scan of a building envelope, which temperature differential between interior and exterior is generally considered the minimum for reliable results?

Accepted Answer

10°F (5.6°C)

Answer

A minimum 10°F (5.6°C) temperature differential is generally required for infrared thermography to reliably detect thermal anomalies in building envelopes.

Question 2

A blower door test on a commercial building reveals an air leakage rate of 0.40 CFM75/ft² of envelope area. How does this compare to ASHRAE 90.1 maximum allowances?

Accepted Answer

It exceeds ASHRAE 90.1 limits

Answer

ASHRAE 90.1 requires commercial envelope air leakage no greater than 0.40 CFM75/ft² for continuous air barriers, so this reading is at or near the limit depending on exact test conditions.

Question 3

What is the primary purpose of a 'tracer gas' test in building envelope commissioning?

Accepted Answer

Quantifying infiltration rates and identifying leakage pathways

Answer

Tracer gas tests inject a non-toxic gas (such as SF6 or CO2) and measure its decay to quantify air infiltration rates and locate leakage pathways in the building envelope.

Question 4

When conducting an energy audit for a facility with a large chiller plant, which metric is most useful for benchmarking chiller efficiency?

Accepted Answer

kW/ton

Answer

kW/ton is the standard metric for benchmarking chiller plant efficiency, representing electrical input per ton of cooling produced, with lower values indicating better performance.

Question 5

In a Level II energy audit, a commissioning professional identifies that a roof assembly has a measured U-value of 0.065 Btu/h·ft²·°F. The design specified U-0.048. What is the most likely cause?

Accepted Answer

Thermal bridging through metal fasteners or framing

Answer

Thermal bridging through metal fasteners, clips, or structural framing significantly increases effective U-value beyond the nominal insulation value, commonly explaining discrepancies between design and measured performance.

(CCP) Certified Commissioning Professional Practice Test

(CCP) Certified Commissioning Professional Practice Test

CCP Building Envelope & Energy Audit 2