Results 161 to 170 of about 2,012 (205)

Center-Oriented Aiming Strategy for Heliostat With Spinning-Elevation Tracking Method

Journal of Solar Energy Engineering, 2022
Abstract Spinning-elevation (SE) tracking system produces a decent image on the receiver surface; however, it is subjected to large variations in tracking speed. In this research, a graphical ray tracing (GRT) model for center-oriented spinning-elevation (COSE) tracking method is developed to evaluate tracking angles. Instead of a target,
Sainath A. Waghmare, Bhalchandra P. Puranik   +1 more
openaire   +1 more source

Field oriented control of stepper motors for a mini heliostat tracking

2021 IEEE 1st International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering MI-STA, 2021
Solar tower power plant has become the most promising concentrated solar power technology for the production of thermal and electrical energy because of its advantages including high improvement rate, possibility of small scale, hybridization, cogeneration.
Marie Pascaline SARR, Mouhamadou Falilou NDIAYE, Biram DIENG, Ababacar THIAM   +3 more
openaire   +1 more source

Optical Analysis of a Heliostat Array With Linked Tracking

Journal of Solar Energy Engineering, 2013
The optical performance of a novel solar concentrator consisting of a 400 spherical heliostat array and a linked two-axis tracking system is analyzed using the Monte Carlo ray-tracing technique. The optical efficiency and concentration ratio are compared for four different heliostat linkage configurations, including linkages of 1 × 1, 1 × 2, 2 × 2, 4 × 
M. T. Dunham, R. Kasetty, A. Mathur, W. Lipiński   +3 more
openaire   +1 more source

Theoretical derivation of heliostat tracking errors distribution

Solar Energy, 2008
The tracking error probability distribution is derived on a pure theoretical basis. Methods of integral geometry and geometrical probabilities are used to this purpose. The distribution performs reasonably well when compared with measurements from a small database.
openaire   +1 more source

Run-time detection and correction of heliostat tracking errors

Renewable Energy, 2017
This paper investigates the effect of tracking errors in heliostats used in solar tower power plants and proposes an approach based on low-cost distributed electronics capable of limiting their impact. An analysis carried out through a parallel model sets the specifications for design of a closed-loop solar tracker based on a low-cost six-axis digital ...
CHIESI, MATTEO, FRANCHI SCARSELLI, ELEONORA, GUERRIERI, ROBERTO   +2 more
openaire   +2 more sources

Shape Optimized Heliostats for Kinematic Sun Tracking

2014
Sun tracking heliostat mirrors are key components of many solar power systems. They must track the Sun’s position in the sky using a spatial 3-D robotic mount. In addition, their ideal shape is a section of a spatial paraboloid that changes as a function of time and the mirrors’ positions in the system.
Li Meng, Zheng You, Steven Dubowsky
openaire   +1 more source

Tracking formulas and strategies for a receiver oriented dual-axis tracking toroidal heliostat

Solar Energy, 2010
Abstract A 4 m × 4 m toroidal heliostat with receiver oriented dual-axis tracking, also called spinning-elevation tracking, was developed as an auxiliary heat source for a hydrogen production system. A series of spinning-elevation tracking formulas have been derived for this heliostat.
Minghuan Guo, Zhifeng Wang, Wenfeng Liang, Xiliang Zhang, Chuncheng Zang, Zhenwu Lu, Xiudong Wei   +6 more
openaire   +1 more source

A direct-drive, linear actuator for a heliostat tracking system

2017 20th International Conference on Electrical Machines and Systems (ICEMS), 2017
A linear actuator suitable for sun tracking applications, heliostats, was investigated. First, a benchmark actuator was modelled using Finite Element (FE) analysis and then a prototype was constructed. The electromagnetic force on the mover was simulated and was found to be in excellent agreement with experiment.
Ning Zhang, Mike Collins, Howard Lovatt
openaire   +1 more source

Research on Tracking Precision of the Heliostat

2008
The tracking precision and manufacture cost of the heliostats is obviously crucial to the system efficiency and its investment scale in a tower power plant. An open loop control system according to astronomic formula of high precision was proposed in this paper.
Wenfeng Liang, Zhifeng Wang
openaire   +1 more source

General Sun Tracking Formula for Heliostats With Arbitrarily Oriented Axes

Journal of Solar Energy Engineering, 2005
Abstract The most general form of solar tracking formulae of an arbitrarily oriented heliostat toward an arbitrarily located target on the Earth is presented. With this complete solution, the used azimuth-elevation, spinning-elevation tracking formula, etc., are the special cases of it.
Y. T. Chen, B. H. Lim, C. S. Lim
openaire   +1 more source