Which of the following refrigerants is commonly used in household applications?

The refrigerant commonly used in household applications among the options provided is Chlorofluorocarbon (CFC). CFCs have historically been used in various refrigeration and air conditioning systems due to their effective thermodynamic properties. They are non-flammable and have a high efficiency in heat transfer, making them suitable for domestic refrigerators and air conditioning units.

However, it's important to note that CFCs have been largely phased out due to their harmful effects on the ozone layer. The environmental impact of CFCs led to the development of alternative refrigerants that are more environmentally friendly, such as hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs). These alternatives balance efficiency and environmental safety.

Ammonia is primarily used in industrial refrigeration systems due to its efficiency but is less common in household applications due to its toxicity and the need for specialized handling. Hydrochlorofluorocarbons were used as a transitional option to reduce ozone depletion but are also being phased out in favor of more sustainable refrigerants. Halon is not used in refrigeration systems; it is mainly utilized in fire suppression systems.

Understanding the historical use of CFCs in household refrigeration helps grasp the evolution of refrigerant