To leach and explain system modelling in a Thermal-Fluid application is a challenge: learning how one component or even the surrounding conditions can influence the performance of the rest of the components of the system and the system itself is not all easy task. However a suitable educational implementation may help students gain a deeper understanding not only of the system itself bill of the existing interrelation between the Thermal-Fluid fields: Thermodynamics, Heat Transfer and Fluid Mechanics. In this study a refrigerating cycle simulator is used. The simulator is' prepared in such a way that the interrelation between each component, the system and the surroundings call be analysed by the students. This case study is found to be very useful due of its ability to study system performance. A three-step educational implementation, the simulator being the third step, has been used and found to he enriching both for students and instructors.