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Sinha R.,Kathmandu Alternative Power and Energy Group Ltd. KAPEG | Acharya P.,Kathmandu Alternative Power and Energy Group Ltd. KAPEG | Freere P.,Monash University | Sharma R.,Technical University of Denmark | And 2 more authors.
Wind Engineering | Year: 2010

The paper describes the selection of Nepalese timber for development of small wind turbine blades on the basis of locally based low cost timbers, along with the selection of coatings to protect the timber from weathering. The selection criterion of timber includes timber mechanical properties, weathering effect on coatings, price, growth and availability of the timber. Mechanical properties such as Young's modulus of elasticity, breaking strength, breaking strain and Brinell's hardness of selected Nepalese timbers are presented. The effects of weathering on timbers without coating, and with different coatings, are analysed on the basis of the change in weight of the timber due to the effect of humidity and rainfall over a period of nineteen months. Degradation of different coatings of timber are compared.


Mishnaevsky L.,Technical University of Denmark | Freere P.,Kathmandu Alternative Power and Energy Group Ltd. KAPEG | Sinha R.,Kathmandu Alternative Power and Energy Group Ltd. KAPEG | Acharya P.,Kathmandu Alternative Power and Energy Group Ltd. KAPEG | And 2 more authors.
Renewable Energy | Year: 2011

The low cost wind turbines with timber blades represent a good solution for the decentralized energy production in off-grid regions of developing countries. This paper summarizes the results of investigations on the mechanical testing and choice of timber for wind blades, testing of different coatings and blades as well as installation and practical experience with wooden wind turbines in Nepal. The recommendations on the optimal choice of Nepali timber and coatings for low cost wind blades are summarized. The timber wood blades were designed and tested. On the basis of the recommendations, the wind turbines with timber (lakuri) wind blades were produced, and tested. The turbines with timber wind blades were installed on several locations around Nepal, and their usability was studied. It was demonstrated that the appropriate choice of timber and coatings ensures necessary reliability of the blades and turbines. It was further demonstrated that the low cost wind turbines with timber blades represent a promising and viable option for the decentralized energy production in developing countries, which also opens new areas for businesses. © 2011 Elsevier Ltd.

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