Question

1. r - 1234yf is a preferred refrigerant over r - 134a because:

r - 1234yf is highly flammable
r - 1234yf has a high gwp
r - 1234yf depletes the ozone layer
r - 1234yf has a low gwp

Explanation:

• GWP stands for Global Warming Potential. A lower GWP means less contribution to global warming.
• R - 1234yf is a more environmentally - friendly refrigerant compared to R - 134a in terms of global warming impact.
• R - 1234yf is not highly flammable (it has a low flammability rating).
• R - 1234yf does not deplete the ozone layer (unlike some older refrigerants like CFCs), but the key differentiator from R - 134a in the context of the options given is its GWP. R - 134a has a relatively high GWP, while R - 1234yf has a low GWP.

Answer:

R - 1234yf has a low GWP