What are common types of refrigerants used in refrigeration systems?

The selection of refrigerants for refrigeration systems primarily revolves around the effectiveness, safety, and environmental impact associated with their use. The correct answer includes common types of refrigerants such as CFCs (chlorofluorocarbons), HCFCs (hydrochlorofluorocarbons), HFCs (hydrofluorocarbons), and natural refrigerants like ammonia and carbon dioxide.

CFCs were traditionally used due to their effectiveness in heat transfer, but their use has diminished due to their harmful impact on the ozone layer. HCFCs were introduced as a transitional solution with reduced ozone depletion potential, although they also have contributed to greenhouse gas emissions. HFCs became the primary alternative due to their lower ozone-depleting properties, but concerns about global warming potential have led to the search for more eco-friendly options.

Natural refrigerants such as ammonia, carbon dioxide, and hydrocarbons are gaining popularity due to their minimal environmental impact and energy efficiency. These substances are often favored in modern systems due to their sustainability and lower global warming impact compared to synthetic refrigerants.

The other options, while they contain various substances, do not accurately represent common refrigerants used in industry. For example, ammonia is indeed a refriger