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The Computer Controlled Flow Boiling Demonstration Unit, "TFEC", has as main component an experimental tube made of two glass concentric tubes. In these tubes two fluids flow crosscurrent: refrigerant, which flows by convection and in an ascendant way through the internal tube, and hot water, which flows in a descendant way through the external tube. This unit has been designed for using SES36 refrigerant gas, free of CFC´s, compatible with the Environment. The main circuit will be where the different stages of the two-phase flow will be visualised by student. Basically, this second circuit is composed of: The electric power consumed by the resistance is controlled, from the computer, by PID over the bath temperature. The heat transfer can be valued because there are two temperature sensors in the refrigerant liquid, in the input and in the output of the concentric tubes. Finally the condensing chamber has a security valve. It also can be used if we want to carry out the refrigerant charge operation. This Computer Controlled Unit is supplied with the EDIBON Computer Control System (SCADA), and includes: The unit itself + a Control Interface Box + a Data Acquisition Board + Co