29 Questions
Which angle is defined as the angular position of the Sun at solar noon with respect to the plane of the equator?
Declination Angle
What is the angular distance between a point on any meridian and the prime meridian at Greenwich?
Longitude
What is the range of values for the Declination Angle according to the provided text?
-23.45° ≤ δ ≤ 23.45°
Which angle is known as the angle between Sun’s ray and its projection on a horizontal surface?
Inclination Angle
At what value is the Inclination Angle equal to at sunrise and sunset based on the text?
$0°$
What does the Zenith Angle represent?
Angle between Sun’s ray and horizontal plane's perpendicular
What is the key advantage of a passive thermosiphon solar water heater over an active solar water heating system?
It requires less equipment and is easier to install
What is the main disadvantage of a passive thermosiphon solar water heater compared to an active system?
It is less efficient at heating water
Which of the following is NOT a characteristic of an active solar water heating system?
Requires a large storage tank
What is the purpose of the on-off controller in an active solar water heating system?
To turn the pump on and off based on the temperature difference
How do active solar water heating systems typically differ from passive thermosiphon systems in terms of water heating capacity?
Active systems can heat a larger volume of water
Which type of building or facility is BEST suited for an active solar water heating system?
Factories, hospitals, hotels, and offices
What is the approximate distance between the Sun and the Earth?
$1.5 \times 10^8$ km
What is the typical range of solar radiation flux available on the Earth's surface?
Rarely exceeds 1 kW/m^2
What is the main challenge in utilizing solar energy?
The real challenge is of an economic nature
What is the term used to refer to the incident solar energy per unit area on a surface over a day?
Insolation
What is the symbol used to represent solar irradiance?
G
What is the typical diameter range of the evacuated tubes used in evacuated tube collectors?
1" (25 mm) to 3" (75 mm)
What type of glass are the evacuated tubes typically made of?
Borosilicate or soda lime glass
What is the primary function of the selective coating on the fins inside the evacuated tubes?
To transfer heat to the fluid circulating through the pipe
What is the typical operating temperature range of a concentrating solar collector?
100 - 400C or above
What is the primary mechanism by which the heat is transferred from the evacuated tubes to the manifold in the header tank?
Convection within the heat transfer fluid in the heat pipe
What is the primary purpose of the evacuated space between the inner and outer glass tubes in an evacuated tube collector?
To reduce heat loss from the inner tube
What is the primary purpose of the supporting structure in a cylindrical parabolic collector?
To facilitate the movement and orientation of the reflecting surface
Which statement about the heat transfer fluid used in cylindrical parabolic collectors is true?
They are called thermic fluids and are organic heat transfer liquids.
What is the primary function of a Compound Parabolic Concentrator (CPC)?
To efficiently collect and concentrate distant light sources
What is the typical reflecting surface material used in cylindrical parabolic collectors?
Curved back silvered glass
Which statement about the production of cylindrical parabolic collectors is true?
There are very few manufacturers worldwide, and the production volume is low.
What is the typical acceptance angle range for Compound Parabolic Concentrators (CPCs)?
25° to 45°
Learn about the fundamentals of solar energy, including the distance of the sun from Earth, the speed at which solar energy reaches the planet, and the vast potential of solar power as a clean and abundant energy source.
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