Analysis of solar radiation factors in Huidong County, Liangshan Yi Autonomous Prefecture, Sichuan Province

The main factors affecting solar radiation are: latitude; Weather conditions; Altitude; Length of sunshine.

1. Latitude: The lower the latitude, the stronger the solar radiation.

2. Weather conditions: there are many cloudy days and less solar radiation in the eastern part of China; Northwest China is inland, with less precipitation, more sunny days and more solar radiation.

3. Altitude: high altitude, thin air, good atmospheric transparency and strong solar radiation.

4. Sunshine length: long sunshine time and strong solar radiation.

5. Others

(1) Atmospheric transparency: If there is a lot of floating dust in the air, the solar radiation intensity is weak.

Terrain:

(2) Slope direction: sunny slopes yield more; The shady slope becomes less. Leeward slope may get more solar radiation because of less precipitation, while windward slope may get less solar radiation because of more precipitation.

(3) Slope:

A hillside facing the sun

A, with the increase of slope, the obtained solar radiation first increases and then decreases;

B, when the sun's rays are perpendicular to the slope, the obtained solar radiation reaches the maximum value, which is the critical value.

C, the slope at the critical value is equal to the latitude difference, which is complementary to the noon sun height angle.

Shadow slope: when the shadow slope is parallel to the sun's rays, the solar radiation obtained by the shadow slope is zero.

Spatial distribution law of total solar radiation in China: it gradually increases from the southeast coast to the northwest inland, with high value appearing in the Qinghai-Tibet Plateau and low value appearing in the Sichuan Basin.

(4) the degree of occlusion of the object

For example, herbs or shrubs under trees receive less solar radiation, and apples covered with green leaves receive less solar radiation.