Design of the Solar Automatic Tracker of Polar Axis Type

Abstract

This paper mainly aims at the special requirement of the solar energys application in tunnel direct lighting engineering, where the light receiver is fixed. Therefore, it has given a new automatic tracking method of polar axis type, which can effectively make the concentrator to realize the function of tracking the sun automatically with high precision and fixed-point output. Based on expounding the working principle of the automatic tracker with polar axis, meanwhile combining with the obliquely installed concentrator load, it talks about the detailed design and explanation of mechanical structure, characteristics and implementation of the suns hour angle and declination angle tracking mechanism.

Simulation and Experimental Study on the Optical Performance of a Fixed-Focus Fresnel Lens Solar Concentrator Using Polar-Axis Tracking

“…On the basis of guaranteeing the tracking accuracy, the tracking with the polar-axis biaxial linkage converts the sun's elliptical moving trajectory to the solar azimuth spinning on the east-west single tilt axis and the declination angle pitching in the north-south direction. The sun declination angle of the FFFSC is changing due to the yearly change of the sun's path [21]. Based on the rotation behavior of the Earth, the Fresnel lens rotates around the polar-axis from east to west every day by the earth rotation angular velocity.…”