Device utilizing underground superficial layer soil temperature for tracking solar declination angles and adjusting method

Abstract

The invention provides a device utilizing underground superficial layer soil temperature for tracking solar declination angles and an adjusting method. According to the invention, the device is driven to track the solar declination angles by utilizing the change rule of the underground superficial layer soil temperature, so that tracking precision is improved and tracking cost is reduced. Inner pressure intensity caused by thermal expansion and cold contraction of a thermal expansion fluid medium subjected to the effect of underground superficial layer soil temperature change drives a piston of a hydraulic pressure cylinder to move in a reciprocating manner. The piston rod pushes a rotary support to track the change of the solar declination angles. Besides, an interference-type temperature compensation adjusting device or an automatic temperature adjustment adjusting device used for compensating the phase difference between the underground superficial layer soil temperature and the solar declination angle change rule are added in the tracking device. According to the adjusting method, the inclination angle of a solar power receiver is reduced during periods around the summer solstice and the winter solstice for achieving the compensation of errors due to delay caused by winter low temperature. Moreover, no manual adjustment is required for the automatic temperature compensation adjusting device and comparatively high-precision tracking can be ensured all the year.

Description

technical field [0001] The invention belongs to solar energy utilization technology. Background technique [0002] The direct sunlight incident light at a certain point on the earth is changing at any time. In order to utilize the direct solar radiant energy as much as possible, the solar energy utilization device is required to be equipped with a device capable of tracking the position of the sun. Most solar tracking devices are mainly electric drive devices. Such devices have high tracking accuracy, but consume energy during the tracking process, and the operation and maintenance costs are high. The present invention realizes the use of regular changes in underground shallow soil temperature to track changes in the sun's declination angle. The tracking device does not consume energy and has low cost , easy to maintain, has high application prospects and market value. [0003] The literature about the device and adjustment method for tracking the sun's declination angle by...

AI Technical Summary

Problems solved by technology

This technology obviously has the following problems: 1. The altitude angle of the sun changes all the time from sunrise to sunset, from only a few degrees at sunrise to 70 or 80 degrees at noon and decreases with the increase of latitude. And then back to the altitude angle of a few degrees at sunset, the range of change is large, the speed of change is fast, and it varies with the seasons, so the tracking of the sun's altitude angle requires fast response, and the temperature of the fluid in the expansion tank changes Due to the influence and limitation of the thermal resistance of heat transfer and the thermal inertia of the device itself, the rate of temperature change is slow, and it is difficult for the active device driven by the temperature change of the fluid in the expansion tank to track the change rate of the solar altitude angle in time, resulting in a large tracking error

[0004] 2. The change consistency between the sun altitude angle and the ambient temperature is poor

The change of ambient temperature has a short cycle in one day, a medium-term cycle in two periods of strong convective weather changes, a long cycle in a year, and a short cycle in the environment temperature and solar altitude angle. The difference in characteristics; in the middle period, after each strong cooling weather, even within a few days, the ambient temperature will rise rapidly with the fine weather, and the ambient temperature changes greatly in the preceding and following days, while the sun The change law of the altitude angle is basically unchanged; in the long period, the average temperature in summer is very high, while the average temperature in

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