Discover where chlorofluorocarbons (CFCs) are commonly found in building applications. Prepare for the LEED Green Associate certification exam with this detailed explanation.
Table of Contents
Question
In which of the following common building applications are chlorofluorocarbons (CFCs) found?
A. Insulation agents
B. Fire hydrants
C. Centrifugal chillers
D. Roof-top vents
Answer
C. Centrifugal chillers
Explanation
Chlorofluorocarbons (CFCs) were commonly used as refrigerants in centrifugal chillers before they were phased out due to their harmful impact on the ozone layer. Centrifugal chillers are large-capacity refrigeration machines that use the vapor compression cycle to cool water or brine, which is then circulated to provide air conditioning in buildings.
CFCs were favored for their stability, non-toxicity, and non-flammability. However, the Montreal Protocol, an international treaty designed to protect the ozone layer, mandated the phase-out of CFCs due to their ozone-depleting properties. As a result, alternative refrigerants such as hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs) have replaced CFCs in most centrifugal chillers.
The other options are incorrect:
A. Insulation agents: CFCs were not commonly used as insulation agents in buildings.
B. Fire hydrants: CFCs have no relation to fire hydrants, which are used for fire suppression.
D. Roof-top vents: CFCs are not associated with roof-top vents, which are used for ventilation and exhaust purposes.
USGBC LEED Green Associate certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the USGBC LEED Green Associate exam and earn USGBC LEED Green Associate certification.