Certified LEED expert explains the common building applications where ozone-depleting chlorofluorocarbons (CFCs) are found. Boost your LEED GA exam prep.
Table of Contents
Question
In which of the following common building applications are chlorofluorocarbons (CFCs) found?
A. Fire hydrants
B. Roof-top vents
C. Insulation agents
D. Centrifugal chillers
Answer
D. Centrifugal chillers
Explanation
Chlorofluorocarbons (CFCs) are a type of compound that was widely used in the 20th century in various applications, including as a refrigerant in air conditioning systems such as centrifugal chillers. CFCs are known to deplete the ozone layer when released into the atmosphere, and their use has been phased out in many countries under the Montreal Protocol.
Chlorofluorocarbons (CFCs) were commonly used as refrigerants in centrifugal chillers in HVAC systems of buildings prior to being phased out due to their ozone-depleting properties. The Montreal Protocol, ratified in 1987, mandated the global phase-out of CFC production.
CFCs are not typically found in the other listed building applications:
A. Fire hydrants use water and are not associated with CFCs.
B. Roof-top vents are used for ventilation and exhausting air, but do not contain refrigerants like CFCs.
C. Insulation agents like foam and fiberglass do not use CFCs. Some early foam insulation used CFCs as blowing agents, but these have been replaced by alternatives like HCFCs and HFCs that have lower ozone depletion and global warming potential.
So in summary, centrifugal chillers are the only common building application listed that previously used CFCs as refrigerants before they were phased out. Understanding the environmental impacts of different materials and systems is crucial for LEED professionals to make informed, sustainable design decisions.
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