Table 3 Monthly and annual OTA for Faisalabad calculated by utilizing all models.
Month | Daily Global Horizontal Irradiance (Hg) | Daily Diffuse Horizontal Irradiance (Hd) | Ambient Temp (°C) | Isotropic Models | Anisotropic Models | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Liu-Jordan | Badescu | Hay-Davies | HDKR | ||||||||
HT | OTA | HT | OTA | HT | OTA | HT | OTA | ||||
1 | 2.25 | 1.3 | 12.2 | 2.7 | 42 | 2.59 | 35 | 3.14 | 50 | 3.17 | 52 |
2 | 3.35 | 1.89 | 16.1 | 3.78 | 35 | 3.66 | 28 | 4.2 | 43 | 4.23 | 44 |
3 | 4.22 | 2.39 | 21.9 | 4.49 | 25 | 4.41 | 18 | 4.75 | 31 | 4.77 | 33 |
4 | 5.29 | 2.96 | 27 | 5.42 | 16 | 5.38 | 11 | 5.55 | 20 | 5.55 | 21 |
5 | 5.87 | 3.19 | 32.8 | 5.91 | 9 | 5.9 | 6 | 5.96 | 11 | 5.96 | 12 |
6 | 5.89 | 3.56 | 32.8 | 5.91 | 5 | 5.9 | 4 | 5.92 | 7 | 5.92 | 7 |
7 | 5.5 | 3.33 | 31.4 | 5.52 | 7 | 5.51 | 4 | 5.55 | 9 | 5.55 | 9 |
8 | 5.39 | 3.21 | 30.7 | 5.47 | 12 | 5.44 | 8 | 5.55 | 16 | 5.55 | 17 |
9 | 4.95 | 2.61 | 29 | 5.21 | 23 | 5.14 | 17 | 5.45 | 28 | 5.46 | 29 |
10 | 3.75 | 2.25 | 25.8 | 4.11 | 30 | 4.01 | 22 | 4.48 | 38 | 4.51 | 40 |
11 | 2.56 | 1.65 | 19.2 | 2.9 | 37 | 2.79 | 28 | 3.29 | 46 | 3.33 | 48 |
12 | 2.18 | 1.29 | 14 | 2.66 | 44 | 2.54 | 36 | 3.12 | 52 | 3.15 | 54 |
Year | 4.27 | 2.46 | 24.4 | 4.51 | 23.75 | 4.43 | 18.08 | 4.75 | 29.25 | 4.77 | 30.5 |
