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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).