külmikmaterjalidena
Külmikmaterjalidena, also known as refrigerants, are substances used in refrigeration and air conditioning systems to absorb heat from a space and transfer it elsewhere. They undergo a phase change from liquid to gas and back again, a process that facilitates cooling. Historically, early refrigerants included ammonia, sulfur dioxide, and methyl chloride. However, these substances posed safety risks due to their toxicity or flammability.
The development of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) in the mid-20th century offered safer alternatives. These
Current refrigerants are largely categorized as hydrofluorocarbons (HFCs), which do not deplete the ozone layer but