instructions to tenderers



trainer for the theoretical and practical study of the generation of electricity by means of wind power. It must be possible to change the flow of the air that reaches the wind turbine and to experiment its operation at no load and load conditions. It must be composed of a wind tunnel with the following components: a single-phase industrial fan with electronic speed regulator; a 12 V, 40 W wind turbine, with a mechanism for a change with respect to the source of the wind; an anemometer; a voltmeter; an ammeter; a power supply, 0÷230 V, 4 A, with instruments for reading wind speed, voltage and current, a potentiometer for controlling the fan simulating the wind and a lamp representing a resistive load. Analogue output from each instrument: 0‐ 10 V; a variable resistive load. Motor and fan: the wind tunnel must be supplied with a fan commanded by a motor. The motor must be coaxial to the fan or external. The fan must be positioned upstream from the test chamber in an area with a high section in order to reduce the necessary power to supply. This must also be put as far away as possible from the entry to the test chamber according to the route that the fluid must take. Flow laminator: it must allow the compensation of the lack of transversal uniformity of the flow that can be traced to the fan vanes. Aerogenerator: it must be mounted in the detection area of the wind tunnel. It must have the following features: Blade diameter = 510mm Average output voltage = 12 V DC. (0-36V max.) Minimum air speed = 3 m/s (10.8 Km/h). Rated speed = 12 m/s (43.2 Km/h). Average electric power = 40 W. The aerogenerator must be installed on a mechanism that shall consent to change the position within the 0 - 30º range with respect to the front of the flow of air, thus simulating the orientation of the vanes for aerodynamic purposes. Anemometer: half-ball instrument to be applied to a metal support in order to detect wind speed at the sides of the fan, aerogenerator outlets and at the fan. This instrument must supply electric voltage, whose value shall be directly proportional to wind speed, applied to the digital instrument with scale in km/h positioned on the power supplier. Output voltage: 0-5V dc. In the aerogenerator support column there must be a safety fuse, which only shall intervene in the event of extreme emergency, such as serious malfunctioning of the generator itself. The trainer must be provided also with a power supply and control 0÷230 V - 4 A, that must include the following elements on the front panel : Voltmeter Ammeter Speedometer Bushes for external command of the inverter Inverter knob for manual fan command Variable resistive load Load light Light switch Analogue signals output bushes Page 1 of 2

Bush for earth connection of the fan motor Fan motor power supply bush And on the rear panel it shall include the following elements: Switch Power supply socket With this trainer it must be possible to perform the following exercises: Identification of the construction parts Starting the training device Definition of wind speed with external anemometer Definition of the wind speed with internal anemometer Detection of the aerogenerator voltage and current Relationship of the aerogenerator with the wind front Practical tests in open environment Electrical connections shall be performed through 2 mm terminal and 4 mm safety connections. Dimensions: 1830 x 600 x 1350 mm. Complete with operation/experiment manual concerning: - Wind as energy resource - Theory of wind turbines and control systems - Elements of the wind turbines - Types of wind turbines - Measurement Systems of the Wind - Wind generation systems. Page 2 of 2