Photovoltaic Systems Engineering

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Photovoltaic Systems Engineering SEC598 Photovoltaic Systems Engineering (SEC501 Solar Engineering and Commercialization, I) Session 02 The Solar Resource August 22, 2018

Session 02 Components The Solar Resource Definitions Solar radiation Tracking the sun Orientation considerations

Learning Outcomes An elementary understanding of the solar resource Recognition of impact of PV system orientations

The Solar Resource – earth’s orbit Messenger & Abtahi, Fig 2.4

The Solar Resource – earth’s orbit

The Solar Resource – The annual motion from the perspective of the celestial sphere d - declination Markvart, Solar Electricity, Fig 2.6

Motion of Sun Diagram – Perspective view of daily motion

Motion of Sun Diagram – Example #1 Arbitrary Latitude zenith latitude Summer Solstice North Pole Equinox 23.5o Winter Solstice 23.5o N S

Motion of Sun Diagram – Example #2 zenith Tropic of Cancer Latitude = 23.5o Summer Solstice Equinox Winter Solstice 23.5o 23.5o North Pole N S

The Solar Resource – altitude and azimuth Markvart, Solar Electricity, Fig 2.7b

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