153078 20251017144554.0 doi 10.1002/we.2450 sideral 116910 ART-2020-116910 eng Lacal-Arántegui, Roberto Technology effects in repowering wind turbines 2020 Access copy available to the general public Unrestricted This research investigates, analyses, and quantifies the technological effects of wind turbine repowering (ie, where old turbines are removed and new turbines are installed at the same or a very close location, including the enhanced performance in energy production). In these cases, it is assumed that both old and new turbines are subject to the same wind regime, other than because of technological elements, such as hub height, and thus it is possible to isolate the effects of new technology from the effect of changing local wind conditions. This research is based on the analysis of empirical data on repowering turbines in Denmark and Germany, and on historical production data available for the Danish component of the data set. Technological innovations are expected to enable new wind turbines to capture more energy at the repowering site, mostly through larger rotors and higher hub heights, and this is what this study has analysed. The results show that new turbines in repowering projects are twice as high, have three times the rotor diameter, nine times the swept area, six times the nominal power, and nine times as much electricity as the old turbines. However, the most significant improvement is probably the increase of capacity factor of 7.1% on a per-turbine basis, or 9.7% on a per-production basis. info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 2.73 2020 ENGINEERING, MECHANICAL 54 / 133 = 0.406 2020 Q2 T2 ENERGY & FUELS 78 / 114 = 0.684 2020 Q3 T3 0.742 2020 Renewable Energy, Sustainability and the Environment 2020 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Uihlein, Andreas Yusta, José María Universidad de Zaragoza (orcid)0000-0003-3174-9703 5009 535 Universidad de Zaragoza Dpto. Ingeniería Eléctrica Área Ingeniería Eléctrica 23, 3 (2020), 660-675 Wind energ. WIND ENERGY 1095-4244 4168523 http://zaguan.unizar.es/record/153078/files/texto_completo.pdf Versión publicada 1912934 http://zaguan.unizar.es/record/153078/files/texto_completo.jpg?subformat=icon icon Versión publicada https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076726403&doi=10.1002%2fwe.2450&partnerID=40&md5=a8f6f2bbab38db5ef04e567cfa705b27 Texto completo de la revista oai:zaguan.unizar.es:153078 articulos driver 2025-10-17-14:12:44 ARTICLE