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11 Direct Radiation on the Horizontal Plane is Converted into Direct Radiation on the Inclined Plane

Author: Source: Datetime: 2016-12-22 12:07:12

Direct Radiation on the Horizontal Plane is Converted into Direct Radiation on the Inclined Plane

The introduction of the slope coefficient Rb has

12
The direct irradiance on the slope
4
Rb can be obtained by substituting the known latitude Φ, the inclination angle β, the declination angle б and the time angle ω into the following formula to obtain IDθ

5
The diffuse irradiance on the inclined plane is obtained by the equation Idθ = IdHcos2 (β/ 2), and the direct irradiance on the inclined surface is obtained from the formula (1-9). So the slope on the surface with the average solar radiation ratio is
6
The total solar radiation on the slope is

7
Where, ρis the ground reflectivity, the engineering calculation to take the average of 0.2, with snow cover the ground when taken 0,7. Table 1-5 shows the results calculated by the above method in the Beijing area.

Table 1-5 Calculated results of total solar radiation on slopes in Beijing area

8

4

4569

8186

0.56

0.32

1.05

0.714

0.283

0.0234

1.02

4660

5

5409

9372

0.58

0.31

0.85

0.583

0.274

0.88

4760

6

5357

9849

0.54

0.34

0.80

0.528

0.30

0.85

4553

7

4522

9581

0.47

0.38

0.90

0.558

0.335

0.85

3844

8

4222

8583

0.49

0.38

0.90

0.558

0.335

0.92

3844

9

3937

7023

0.56

0.32

1.20

0.816

0.283

1.12

4409

10

3089

5260

0.58

0.31

1.60

1.104

0.274

1.40

4329


Note: Kj/(m2d)
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