CBCP CBCP Energy Management & Sustainability 2

Question 1

What is 'demand-controlled ventilation (DCV)' and why is it significant in energy commissioning?

Accepted Answer

Adjusting outdoor air supply based on actual CO2 levels to reduce over-ventilation energy waste

Answer

Ventilation controlled by occupant manual switches

Answer

Emergency ventilation triggered by smoke detectors

Answer

Controlling ventilation based on outdoor temperature only

Question 2

An energy model predicts a building will use 45 kBtu/sq ft/yr, but post-occupancy metering shows 72 kBtu/sq ft/yr. What is the first step in a commissioning investigation?

Accepted Answer

Review BAS trend data and compare actual operating schedules and setpoints against design assumptions

Answer

Replace all HVAC equipment immediately

Answer

Increase insulation on all exterior walls

Answer

Install more energy meters

Question 3

What is 'measurement and verification (M&V)' in the context of energy commissioning?

Accepted Answer

A systematic process of measuring and analyzing energy data to confirm that energy conservation measures achieve their predicted savings

Answer

Verifying electrical panel labels match circuit schedules

Answer

Calibrating water flow meters only

Answer

Testing fire alarm notification appliances

Question 4

Which ASHRAE standard provides guidance on measurement and verification of energy and water savings in buildings?

Accepted Answer

ASHRAE Guideline 14

Answer

ASHRAE 55

Answer

ASHRAE 62.1

Answer

ASHRAE 90.1

Question 5

What is the purpose of a 'building energy audit' conducted during retro-commissioning?

Accepted Answer

Systematically identifying energy waste, inefficiencies, and opportunities for improvement in existing building systems

Answer

Reviewing the building's financial statements

Answer

Auditing safety compliance records

Answer

Reviewing contractor submittals

Question 6

In a chilled water system, what commissioning check helps verify that the chiller is operating at or near its design efficiency (kW/ton)?

Accepted Answer

Verifying entering and leaving chilled water temperatures, flow rate, and compressor power draw to calculate actual efficiency

Answer

Measuring chilled water pipe insulation thickness

Answer

Checking condenser water chemical treatment logs

Answer

Testing expansion valve superheat settings