Absorption refrigeration cycle was used before vapor-compression refrigeration became popular, especially in factories for cooling and making ice. When electric compressors came into the picture, vapor-compression systems took over because they could cool more effectively. They also used cheaper refrigerants and were safer. Nevertheless, absorption refrigeration still has its place in situations when low noise

Household refrigerators and most refrigeration appliances operate using a vapor-compression refrigeration cycle that consists of main components: (1) compressor, (2) condenser, (3) expansion valve, and (4) evaporator. This closed-loop cycle continuously circulates the refrigerant, transferring heat from the inside of the refrigerator to the outside. Additional components may be present depending on the refrigerator design

Air conditioning filters purify the air from pollutants, odors, dust, and bacteria. The materials used in filters, their functions, and the degree of purification vary depending on where your air conditioner is located and what kind of air quality you want to achieve. For example, in residential buildings, filters purify the air from dust and