Title: Unit 3 Quiz
Course: ELTR 2334 Solar Photovoltaic Technology > Section: ELTR 2334 Solar Photovoltaic Technology

Q: What is the quantitative (mathematical) difference between the Sun’s altitude (elevation) angle and an optimum solar-PV array tilt angle, at that optimum moment in time?

Q: Look at the Cartesian sun map for 40^o N Latitude.

On January (or November) 21^st at solar noon, what would be the optimum array tilt angle for a solar-PV array?

Q: Look at the Cartesian sun map for 40^o N Latitude.

A solar-PV array is facing toward 15^o W azimuth, with an array tilt of 65^o.   This array orientation is optimized for the date of ________________________, at the time of ______________________.

Q: Look at the Solar Pathfinder^TM chart for 37^o – 43^o N Latitude.

During the month of March, what percentage of a clear day’s total, possible irradiation is available between the hours of 10am and 2pm?  _______________ %.

Q: Look at the Solar Pathfinder^TM chart for 37^o – 43^o N Latitude.

Approximately how many more hours of sunlight are available in June than in December? (Because of the poor picture quality, use the morning half of the day and multiply x 2)

Q: If a potential, specific location for a solar-PV array is too badly shaded by a tree sitting directly to the south, there are two possible directions the array can be moved to reduce the shading problem.  These two directions are ________________ and/or _______________.

Q: For a fixed, solar-PV array facing due south, there are two factors that cause the array output to diminish as the sun moves from its noon position to its 5pm position.  These two factors are ___________________________________________, and _________________________.

Q: From a geometric or mathematical perspective, the difference between the Earth’s Ecliptic Plane and its Equatorial Plane = __________ ^o, and is known as the Earth’s solar ____________________.

Q: Explain, simply, the difference between solar irradiance and solar irradiation.  Irradiance is a measure of solar _______________________________, while irradiation is a measure of solar ______________________.

Q: Look at the picture, below, and the Cartesian sun map for 40^o N Latitude.

Find the sun’s elevation at 9am and 3pm, on December 21^st and then calculate the minimum distance between these adjacent, sawtooth, rack-mounted PV arrays (show your calculation).  d = ___________________.