SUN RADIATION

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The figure shows how to calculate the radiation incident on a titled surface (S module ) given either the solar radiation measured on horizontal surface (S horiz ) or the solar radiation measured perpendicular to the sun (S incident ). The equations: S horizontal = S incident sinα S module = S incident sin (α + β) where α is the elevation angle (α = 90-ϕ+∂ ) latitude + declination angle β is the tilt angle of the module measured from the horizontal. Therefore: S module S = horizontal sinα MAGISTER TEKNIK ELEKTRO sin( α + β ) 0 ⎡360 ⎤ δ = 23. 45 sin⎢ ( 284 + d) ⎥ ⎣365 ⎦
USING VECTOR TO CALCULATE SOLAR DIRECTION As the number of tilts and orientations become more complicated it is often easier to convert the solar directions of azimuth and elevation to vectors. S module = S incident cosγ = S incident S.N MAGISTER TEKNIK ELEKTRO
Page 1 and 2: SUN RADIATION MAGISTER TEKNIK ELEKT
Page 3 and 4: Light may be viewed as consisting o
Page 5 and 6: The solar radiation intensity, H 0
Page 7 and 8: SOLAR RADIATION OUTSIDE THE EARTH M
Page 9 and 10: SOLAR RADIATION ON THE EARTH’S EA
Page 11 and 12: EFFECT OF AIR MASS The Air Mass qua
Page 13 and 14: SOLAR TIME LOCAL SOLAR TIME (LST) &
Page 15 and 16: TIME CORRECTION FACTOR TC = 4( LSTM
Page 17 and 18: ELEVATION ANGLE To calculate the su
Page 19: SOLAR RADIATION ON TILTED SURFACE T

SUN RADIATION

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