Assessment of locally manufactured small wind turbines in the NTUA labs and current research and development on open source renewable energy technologies
The assessment of open source technologies by the Rural Electrification Research Group (part of SmartRUE) of the NTUA is described. This includes laboratory experimental results on locally manufactured axial flux generators for determining their efficiency and power production, while hand curved wooden blades are tested in a wind tunnel for measuring the aerodynamic efficiency of the rotor. Field tests on a typical battery charging wind energy system using a locally manufactured small wind turbine are included, obtained from the coastal small wind turbine test site of NTUA in Rafina. The power curve and the efficiency of the complete system are presented along with and estimation of the annual energy production for different mean wind speeds. The operation of the furling system is documented with a variation of tests for different weights of the tail vane. During the field tests, the operation and maintenance of the wind turbine are also monitored while its robustness is evaluated.
Further open source hardware research and development for rural applications that has been conducted at the NTUA is described. Research fields include different magnetic materials for small wind turbines and the open design of pico-hydro turbines for rural electrification applications.