Which of the following is considered to be the long-term refrigerant?

The classification of refrigerants into long-term options often considers their environmental impact, stability, and regulatory status. HFCs, or hydrofluorocarbons, have been recognized for their effectiveness as refrigerants and are regarded as more environmentally friendly compared to older refrigerants like CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). HFCs do not deplete the ozone layer, which is a significant advantage in terms of sustainability.

While they do have a global warming potential, advances in technology and regulations are driving the development of low-GWP (Global Warming Potential) alternatives within the HFC category, making them a suitable option for long-term use. In addition, many systems have been designed to effectively utilize HFCs, contributing to their acceptance and continued use in the industry.

Ammonia, while also considered a refrigerant, is primarily used in industrial refrigeration systems and poses safety risks such as toxicity and flammability, which limits its application in more widespread scenarios compared to HFCs.

Thus, HFCs are seen as a viable long-term refrigerant option given their current regulatory status and industry adoption, providing stability and efficiency in various applications.