Solar Insolation and Photovoltaic Power Relationship Quiz
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Questions and Answers

What is the solar declination?

The angle formed between the plane of the equator and a line drawn from the center of the sun to the center of the earth.

When is the declination angle equal to 0 degrees?

Only at the spring and fall equinoxes.

Define altitude angle in relation to the sun's position.

The altitude angle is the angle between the sun and the local horizon directly beneath the sun.

How is azimuth angle defined with respect to the sun?

<p>The azimuth angle is positive in the morning with the sun in the east and negative in the afternoon with the sun in the west.</p> Signup and view all the answers

What does the seasonal variation of the declination angle refer to?

<p>It refers to the change in the angle between the equator and a line drawn from the center of the Earth to the center of the sun throughout the year.</p> Signup and view all the answers

What is the term used to describe the sun's apparent location in the sky east or west of true south?

<p>Azimuth</p> Signup and view all the answers

What does the altitude angle of the sun define?

<p>The height of the sun</p> Signup and view all the answers

How does the azimuth angle of the sun define its position in the horizon?

<p>By indicating the off-south position</p> Signup and view all the answers

What phenomenon causes the length of the day and night to vary depending on the time of the year and the location's latitude?

<p>The rotation of the earth about its axis</p> Signup and view all the answers

When does the shortest solar day typically occur for places in the northern hemisphere?

<p>Around December 21 (winter solstice)</p> Signup and view all the answers

Define solar declination.

<p>Solar declination is the angle of the sun relative to the Earth's equator.</p> Signup and view all the answers

Explain the seasonal variation of declination angle.

<p>The seasonal variation of declination angle is caused by the Earth's tilt on its axis, resulting in the sun's angle changing over the course of a year.</p> Signup and view all the answers

What is the altitude angle in the context of solar energy?

<p>The altitude angle is the angle between the sun and the horizontal plane.</p> Signup and view all the answers

Define azimuth angle as related to solar position calculation.

<p>Azimuth angle is the compass direction from which the sunlight is coming at any specific point on the Earth's surface.</p> Signup and view all the answers

How is solar insolation calculated using solar irradiance and time?

<p>Solar insolation is calculated by multiplying the average solar irradiance by the time period during which the irradiance is received.</p> Signup and view all the answers

Define solar declination.

<p>Solar declination is the angle between the rays of the sun and the plane of the earth's equator.</p> Signup and view all the answers

Explain the seasonal variation of declination angle.

<p>The declination angle varies throughout the year due to the tilt of the Earth's axis, causing the sun to be directly overhead different latitudes at different times of the year.</p> Signup and view all the answers

What is altitude angle in relation to solar radiation?

<p>Altitude angle is the angle between the sun and the horizontal plane measured at a specific location on Earth.</p> Signup and view all the answers

Define azimuth angle in the context of solar position calculation.

<p>Azimuth angle is the compass direction from which the sunlight is coming at a specific location on Earth.</p> Signup and view all the answers

How is solar position calculated based on altitude and azimuth angles?

<p>Solar position can be calculated by combining altitude and azimuth angles with the time of day and geographic coordinates of a location.</p> Signup and view all the answers

What is the significance of the solar window in the context of solar energy?

<p>It is the area in the sky between the sun path of the winter and summer solstices for specific hours with high insolation.</p> Signup and view all the answers

What is the relationship between the tilt angle of a PV module and the latitude?

<p>The highest average insolation on a PV module is achieved when the tilt angle is equal to the latitude.</p> Signup and view all the answers

Explain the significance of solstices and equinoxes in relation to solar energy generation.

<p>Solstices and equinoxes mark important dates in the solar calendar, affecting the sun's path and intensity throughout the year.</p> Signup and view all the answers

How does the distance between the Earth and the Sun vary throughout the year?

<p>The Earth's distance from the Sun varies due to its elliptical orbit, with the closest point (perihelion) around January 3 and the farthest point (aphelion) around July 4.</p> Signup and view all the answers

What causes the seasonal variation in the solar declination angle?

<p>The tilt of the Earth's axis of rotation and its revolution around the Sun cause the seasonal variation in the solar declination angle.</p> Signup and view all the answers

Define solar declination.

<p>The angle between the rays of the sun and the plane of the earth's equator.</p> Signup and view all the answers

Explain the seasonal variation of declination angle.

<p>The declination angle varies seasonally due to the tilt of the Earth's axis, causing changes in the intensity of solar radiation received at different latitudes.</p> Signup and view all the answers

What is the altitude angle in relation to solar position calculation?

<p>The altitude angle is the angle between the sun and the horizontal plane at the observer's location.</p> Signup and view all the answers

Define azimuth angle in the context of solar position calculation.

<p>The azimuth angle is the compass direction from which the sunlight is coming at any specific point on the earth's surface.</p> Signup and view all the answers

How is solar position calculated using solar declination, altitude angle, and azimuth angle?

<p>Solar position is calculated by considering the solar declination, altitude angle, and azimuth angle to determine the sun's precise location in the sky at a specific time and place.</p> Signup and view all the answers

Explain the concept of solar declination.

<p>Solar declination is the angle between the rays of the sun and the plane of the Earth's equator.</p> Signup and view all the answers

How does the seasonal variation of the declination angle impact solar radiation?

<p>Seasonal variation of the declination angle affects the intensity of solar radiation received at different latitudes.</p> Signup and view all the answers

Define altitude angle in relation to solar radiation.

<p>Altitude angle is the angle between the sun and the horizontal plane at a specific location on Earth.</p> Signup and view all the answers

Explain how the azimuth angle is defined with respect to the sun.

<p>Azimuth angle is the compass direction from a specific location on Earth to the position of the sun in the sky.</p> Signup and view all the answers

How is solar position calculated using solar radiation components?

<p>Solar position is calculated by considering the components of direct, diffuse, and reflected solar radiation.</p> Signup and view all the answers

What is the formula to calculate global solar radiation?

<p>Global solar radiation (Eg) is calculated as the sum of direct radiation (Ed) and diffuse radiation (Ef).</p> Signup and view all the answers

Describe the concept of air mass (AM) in solar radiation.

<p>Air mass (AM) is the ratio of the path length of solar radiation through the Earth's atmosphere to the shortest possible path.</p> Signup and view all the answers

How does the amount of solar radiation reaching the Earth's surface vary with the air mass value?

<p>The amount of solar radiation reaching the Earth's surface decreases as the air mass value increases.</p> Signup and view all the answers

Explain the significance of the sun's altitude in solar energy generation.

<p>The sun's altitude determines the angle at which solar radiation strikes the Earth's surface, impacting energy absorption.</p> Signup and view all the answers

How do atmospheric filters like the atmosphere and oceans affect solar radiation?

<p>Atmospheric filters like the atmosphere and oceans selectively absorb or scatter certain wavelengths of solar radiation.</p> Signup and view all the answers

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