Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Hans Bernhoff"'
Publikováno v:
Wind Energy, Vol 25, Iss 5, Pp 897-913 (2022)
Abstract This paper presents the influence of the strut and the tower on the aerodynamic force of the blade for the vertical axis wind turbine (VAWT). It has been known that struts degrade the performance of VAWTs due to the inherent drag losses. In
Externí odkaz:
https://doaj.org/article/96b1f3633fe1404e86fb988cb7b11ef3
Publikováno v:
Högre Utbildning, Vol 10, Iss 1, Pp 57-62 (2020)
In this paper we discuss and present results from the pedagogical development of an advanced-level undergraduate electrical engineering course at Uppsala University, where a new laboratory experiment was implemented. The implementation of the laborat
Externí odkaz:
https://doaj.org/article/c25d6fc6425f4226ab7b86d1f89169c7
Publikováno v:
Energies, Vol 15, Iss 7, p 2361 (2022)
This paper compares three different numerical models to evaluate their accuracy for predicting the performance of an H-rotor vertical-axis wind turbine (VAWT) considering the influence of struts. The strut of VAWTs is one factor that makes the flow f
Externí odkaz:
https://doaj.org/article/c8dba6ffcf3b41a6b0e23f649d20fcbb
Publikováno v:
Energies, Vol 13, Iss 8, p 1874 (2020)
This work presents a numerical study of the aerodynamic performance and the resulting flow field of two novel Savonius wind turbines with twisted blades. The novelty relies on the blade manufacturing process which is characterized by a ‘twisted cut
Externí odkaz:
https://doaj.org/article/3f12f925f9a046b3b36dcadf40008417
Publikováno v:
Energies, Vol 8, Iss 10, Pp 10636-10663 (2015)
A review of flywheel energy storage technology was made, with a special focus on the progress in automotive applications. We found that there are at least 26 university research groups and 27 companies contributing to flywheel technology development.
Externí odkaz:
https://doaj.org/article/486637af582a47f9b3f6b38db96cc6b4
Publikováno v:
Energies, Vol 8, Iss 8, Pp 8482-8496 (2015)
The knowledge of unsteady forces is necessary when designing vertical axis wind turbines (VAWTs). Measurement data for turbines operating at an open site are still very limited. The data obtained from wind tunnels or towing tanks can be used, but hav
Externí odkaz:
https://doaj.org/article/dda0fa341a634882817ff4f6e0ebd77b
Autor:
Morgan Rossander, Eduard Dyachuk, Senad Apelfröjd, Kristian Trolin, Anders Goude, Hans Bernhoff, Sandra Eriksson
Publikováno v:
Energies, Vol 8, Iss 6, Pp 5973-5996 (2015)
Unique blade force measurements on an open site straight-bladed vertical axis wind turbine have been performed. This paper presents a method for measuring the tangential and normal forces on a 12-kW vertical axis wind turbine prototype with a three-b
Externí odkaz:
https://doaj.org/article/edb64f9fb6c14144b3066f9e38695c05
Autor:
Hans Bernhoff, Johan Lundin, Juan de Santiago, Janaína Gonçalves de Oliveira, Johan Abrahamsson
Publikováno v:
Energies, Vol 5, Iss 8, Pp 2794-2817 (2012)
This paper presents experimental results on an innovative electric driveline employing a kinetic energy storage device as energy buffer. A conceptual division of losses in the system was created, separating the complete system into three parts accord
Externí odkaz:
https://doaj.org/article/a7e7a4c95a014e67a2bac14713ffac18
Publikováno v:
Energies, Vol 10, Iss 3, p 316 (2017)
A hollow cylinder flywheel rotor with a novel outer rotor switched reluctance machine (SRM) mounted on the interior rim is presented, with measurements, numerical analysis and analytical models. Practical experiences from the construction process are
Externí odkaz:
https://doaj.org/article/b52c253bf40c4cf7a6362e70543f4105
Publikováno v:
Energies, Vol 9, Iss 7, p 570 (2016)
This paper presents a review of over a decade of research on Vertical Axis Wind Turbines (VAWTs) conducted at Uppsala University. The paper presents, among others, an overview of the 200 kW VAWT located in Falkenberg, Sweden, as well as a description
Externí odkaz:
https://doaj.org/article/ab3f308d273242f2ad6b41dd926ede90