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Table 1 Comparison of mean daily global insolation results

From: Community-scale assessment of rooftop-mounted solar energy potential with meteorological, atlas, and GIS data: a case study of Guelph, Ontario (Canada)

Month

Beta (tilt)

NRCan Interactive Maps (2007)

National Atlas of Canada (1984)

Korsun and Stranix (1984)

Modified Liu and Jordan (1963)

Real sky (MJ/m2/day)

Real sky (MJ/m2/day)

Clear sky (MJ/m2/day)

Clear sky (MJ/m2/day)

Real sky (MJ/m2/day)

B + D

B + D

Total

B + D

Total

April

Horizontal (0°)

15 to 18

17 to 18

23.3

32.6

32.6

16.3

16.3

Vertical (90°)

9 to 12

11 to 12

13.6

18.2

21.59

8.89

10.6

June

Horizontal (0°)

21 to 24

22 to 23

30.8

40.7

40.7

21.9

21.9

Vertical (90°)

9 to 12

8 to 9

7.41

11.2

15.3

7.53

9.72

October

Horizontal (0°)

9 to 12

9 to 10

12.3

20.2

20.2

9.31

9.31

Vertical (90°)

9 to 12

11 to 12

17.8

24.9

26.9

9.00

9.93

December

Horizontal (0°)

3 to 6

4 to 5

5.44

10.5

10.47

4.43

4.43

Vertical (90°)

6 to 9

7 to 8

14.2

23.7

26.2

6.67

7.76

Annual

Horizontal (0°)

12 to 15

13 to 14

17.8

25.9

25.9

13.5

13.5

Vertical (90°)

9 to 12

10 to 11

13.7

19.9

23.4

8.76

10.53

  1. Horizontal and vertical, south-facing surfaces: β = 0° and β = 90°, γ = 0°, respectively. As obtained from the various data sources and models: interactive maps of the PV potential and solar resource of Canada - NRCan[20], the National Atlas of Canada[40], Korsun and Stranix[34] model, modified Lui and Jordan[35] model; clear and real sky (with insolation data); values for the models indicated as sums of beam and diffuse (B + D).