The reversed Carnot cycle is used in refrigerators and heat pumps. It operates between two specified temperatures and achieves the highest theoretical coefficient of performance. The cycle involves four processes: 1) isentropic compression of the refrigerant using a compressor to the maximum temperature T2. 2) Isothermal condensation of the refrigerant using a condenser at T2. 3) Isentropic expansion of the refrigerant using an expansion device to the minimum temperature T1. 4) Isothermal absorption of heat from the substance using an evaporator at T1, providing the refrigeration effect.