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The Computer Controlled Centrifugal Fan Teaching Unit, "HVCC", allows the students to study the operation characteristics of a centrifugal fan. For that purpose, the unit carries out the measurements of flow, speed, temperature, pressure and humidity. Multiple tests related to air flows can be performed with the accessories. The main element of this unit is a computer controlled speed centrifugal fan, which is measured through a speed sensor, and a wattmeter determines the power consumed by the fan. The unit also includes an aspiration duct and a discharge duct, both transparent. Two butterfly valves, placed in the inlet of the aspiration duct and at the outlet of the discharge duct, regulate the air flow. The transparent aspiration duct has an orifice plate to calculate the air flow through a differential pressure sensor. There are other two differential pressure sensors to measure the pressure in the aspiration duct and in the discharge duct. The unit is supplied with a set of three interchangeable turbines to study and analyse the influence of the blades shape: There are also temperature, pressure and humidity measurements to know the inlet air conditions. This Computer C