The most visible part of the Green Campus project is the wind turbine, which has been built in the park right in front of the university.
The Green Campus wind turbine has been erected in the park in front of the university. The turbine is part of the university's smart grid and works as a research and teaching environment.
The 20 kilowatt turbine's tower height is 30 metres and the diameter of the rotor is 12 metres. The wind turbine that was built as a symbol of the Green Campus is located close to the shore in the Tervahaudanpuisto park, the highest spot in the area. The turbine is surrounded on three sides by buildings and a hill and the prevailing wind direction is from the southwest.
Device's value hides its use for teaching, research and demonstration
Having their own wind turbine puts a genuine research tool and real operating conditions at the disposal of researchers. The wind turbine is a modern product development laboratory which is well suited as a tool for research, training and students' work. The turbine models high output, direct drive turbines so it is a good illustration of turbine technology at the megawatt class, operating principles and equipment solutions. Electricity technology in particular is identical with machines with high output.
The energy from the wind turbine is fed to LUT's energy laboratory which enables them to carry multi-faceted research into electricity generation and distribution. Possible areas for development in the turbine are further development of the blades as well as measurement techniques.
New blades that are suitable for lower average wind speeds could improve the wind turbine's capacity factor and by developing measurement techniques for the turbine, more detailed measurement data from the turbine can be obtained.
Optimisation of structures, management of structural vibration, materials technology, maintenance as well as economic manufacture of structures and components are also of interest to researchers and to companies in the wind power sector.
The increasing production of wind power leads to a need to increase knowledge related to maintenance and operating expertise. This expertise is being developed in LUT. Companies located in South Karelia will also benefit from the wind turbine intended for research use.
Technology in brief
- Turbine blade length: 6 m
- Total height of tower and base: c. 36 m
- Construction: reinforced glass fibre horizontal axle three-bladed turbine
- Rated wind speed (optimal): 11 m/s
- Wind speed required for rotation over 3 m/s, will not rotate at all in lighter winds
- When wind speed is over 20 m/s, the turbine is stopped and the nacelle is turned to be at right angles to the wind direction
- When the grid voltage is lost, there is no power failure, the turbine's output is stopped by a protection relay. For safety reasons the protection relay is embedded in the control system that connects the micro generation to the grid.
- The expected noise at the centre of the blades (the axis height) at a height of 30 metres is about 60 dB when the wind speed is 10 m/s, which corresponds to normal traffic noise (c. 55–75 dB)
Highest measured instantaneous power 26 kW
- Aerodynamic efficiency for a 20kW turbine is in the region of 20-30 % (wind kinetic energy converted to mechanical energy)
- Conversion of mechanical energy to electricity in the Green Campus turbine is estimated at 60-80 % depending on the operating point
- Payback time for the Green Campus turbine is not relevant given its intended use and its location in a shadowed area. At an average capacity factor (8%), the pay-back time at zero interest is about 35 years assuming a price of EUR 70 000 and maintenance costs of EUR 100/v. These kinds of figures would be reached by a turbine high in the open on a hill or on the shore in an open landscape.