CBCP CBCP Energy Management & Sustainability 1 — Questions and Answers
Question 1: What is the primary goal of energy commissioning in a new building?
- Reducing construction costs
- Verifying that energy-consuming systems operate as designed to meet energy performance targets (Correct answer)
- Selecting utility providers
- Installing renewable energy systems
Correct answer: Verifying that energy-consuming systems operate as designed to meet energy performance targets
Energy commissioning ensures building systems operate efficiently and as designed, achieving the intended energy performance benchmarks.
Question 2: ASHRAE Standard 90.1 is primarily referenced in US building commissioning for which purpose?
- Ventilation and indoor air quality requirements
- Energy efficiency requirements for buildings except low-rise residential (Correct answer)
- Fire and life safety codes
- Water efficiency standards
Correct answer: Energy efficiency requirements for buildings except low-rise residential
ASHRAE 90.1 sets the energy efficiency minimum requirements for commercial buildings and is the basis for most US energy codes.
Question 3: What is an 'Energy Use Intensity (EUI)' metric used for in building commissioning?
- Measuring outdoor air quality index
- Quantifying a building's annual energy consumption per square foot to benchmark performance (Correct answer)
- Calculating the peak electrical demand charge
- Determining the HVAC system tonnage
Correct answer: Quantifying a building's annual energy consumption per square foot to benchmark performance
EUI normalizes energy consumption by building area (kBtu/sq ft/yr), enabling fair comparison to similar buildings and performance targets.
Question 4: During retro-commissioning of an existing building, a commissioning agent discovers that the AHU is running at full speed 24/7 even when the building is unoccupied. What is the recommended corrective action?
- Replace the AHU with a larger unit
- Implement an occupancy-based scheduling sequence and add a VFD if not present (Correct answer)
- Increase the cooling setpoint by 5°F
- Install additional ductwork
Correct answer: Implement an occupancy-based scheduling sequence and add a VFD if not present
Implementing occupancy-based schedules and VFD control dramatically reduces energy waste during unoccupied periods.
Question 5: What does LEED's 'Enhanced Commissioning' credit require beyond fundamental commissioning?
- A third-party commissioning authority independent of the design team, with additional scopes including envelope and lighting systems (Correct answer)
- Installing solar panels on the roof
- Achieving a 50% energy reduction below ASHRAE 90.1
- Conducting annual occupant satisfaction surveys
Correct answer: A third-party commissioning authority independent of the design team, with additional scopes including envelope and lighting systems
LEED Enhanced Commissioning requires an independent CxA engaged early in design and expands scope to include building envelope, lighting controls, and renewable energy systems.
Question 6: What is the function of a Variable Frequency Drive (VFD) in energy management of a pumping system?
- Converting AC power to DC for controls
- Varying motor speed to match actual load, reducing energy consumption compared to constant-speed operation (Correct answer)
- Providing emergency backup power to pumps
- Monitoring water quality parameters
Correct answer: Varying motor speed to match actual load, reducing energy consumption compared to constant-speed operation
A VFD reduces pump speed to match actual system demand, saving energy since pump power decreases with the cube of speed reduction.
CBCP CBCP Energy Management & Sustainability 1
What is the primary goal of energy commissioning in a new building?