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The Computer Controlled Refrigeration Unit with Open Compressor is arranged in a clear way and represents a typical compression refrigeration system with open compressor: The low pressure saturated refrigerant vapor, coming from the evaporator, is compressed in an open compressor driven by an electric motor though a V-belt. Therefore, its pressure increases, involving a temperature increment too. It causes the transformation of the workingfluid from saturated steam to superheated steam. The number of revolutions of the electric motor is adjustable, allowing the study of the cycle at different degrees of compression. In addition, the electric motor is suspended as a pendulum, having a force sensor to determine the torque. The high pressure superheated steam from the compressor flows inside an air condenser, where the working fluid, in vapor phase, transfers heat to atmospheric air (hot source) whilepassing through the tubes. Therefore, the working fluid undergoes a phase change, to liquid state, through a condensation process. At the outlet of the condenser the cooling liquid passes through an expansion valve , whose function is to control the flow of refrigerant in liquid state