Regarding R-134a, which statement is true?

Regarding R-134a, which statement is true?

• A. R-134a has nonzero ODP and very low GWP.
• B. R-134a has zero ODP and a relatively high GWP.
• C. R-134a has zero GWP and zero ODP.
• D. ODP and GWP are not used in evaluating refrigerants.

Answer: (B)

ODP and GWP are two environmental metrics used to evaluate refrigerants. ODP measures the potential to deplete the ozone layer, while GWP compares how much heat a substance traps in the atmosphere relative to CO2 over a specific time (usually 100 years). R-134a has zero ozone depletion potential because it contains no chlorine, so it won’t break down the ozone layer like chlorine‑bearing refrigerants. But it has a relatively high global warming potential, meaning a release of this refrigerant has a strong warming effect compared with CO2 (its GWP is about 1,400 over 100 years). So the true characterization is that it has zero ODP and a relatively high GWP. This combination is why newer refrigerants are sought that maintain zero ODP but have much lower GWP.

ODP and GWP are two environmental metrics used to evaluate refrigerants. ODP measures the potential to deplete the ozone layer, while GWP compares how much heat a substance traps in the atmosphere relative to CO2 over a specific time (usually 100 years).

R-134a has zero ozone depletion potential because it contains no chlorine, so it won’t break down the ozone layer like chlorine‑bearing refrigerants. But it has a relatively high global warming potential, meaning a release of this refrigerant has a strong warming effect compared with CO2 (its GWP is about 1,400 over 100 years). So the true characterization is that it has zero ODP and a relatively high GWP. This combination is why newer refrigerants are sought that maintain zero ODP but have much lower GWP.