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

DCV uses CO2 sensors as a proxy for occupancy to modulate outdoor air intake, preventing energy waste from over-ventilating lightly occupied spaces.

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

Reviewing BAS trend data against design assumptions identifies whether operational deviations (schedules, setpoints, equipment runtime) explain the gap.

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

M&V quantifies actual energy savings from conservation measures by comparing measured baseline and post-implementation energy consumption.

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 Guideline 14 provides protocols for measuring and verifying energy and water savings from efficiency projects.

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

An energy audit evaluates existing building systems to identify operational deficiencies and capital improvements that reduce energy consumption.

CBCP - Certified Building Commissioning Professional Practice Test

CBCP - Certified Building Commissioning Professional Practice Test

CBCP CBCP Energy Management & Sustainability 2