Environmental Protection Agency (EPA) MVAC Certification

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Which refrigerant has an Ozone Depletion Potential (ODP) value of 1?

CFC-12
CFC-11
HCFC-22
R-134a

The correct answer is: CFC-11

The refrigerant with an Ozone Depletion Potential (ODP) value of 1 is CFC-11. This value indicates that CFC-11 has the same ozone depletion potential as the reference compound used for measuring ozone depletion, which is trichlorofluoromethane. CFCs, such as CFC-11, contain chlorine atoms that, when released into the atmosphere, can break down ozone molecules, thereby contributing to ozone layer depletion. The significance of slightly differing ODP values among various substances reflects their chemical composition and how effectively they can destroy ozone in the stratosphere. For instance, while CFC-12 also has notable environmental impacts, it is assigned a different ODP. Meanwhile, HCFC-22 and R-134a are designed to have lower ODPs compared to CFCs, with HCFC-22 having a value of 0.05 and R-134a having a value of 0. This highlights the transition in refrigerant technology aimed at reducing substances that harm the ozone layer. Understanding ODP values is crucial for compliance with environmental regulations, as the use of substances with high ODPs is being phased out to protect the ozone layer.