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Renewable Energy Resources

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S. CO and
Description Marks
No. KL

1. Define solar constant. What is its standard value? 2 CO2, K2

2. What is surface azimuth angle?
2 CO2, K1

3. On what factors does the collector efficiency of a 2 CO2, K3
solar flat plate collector depend?
4. Describe the difference between the Direct 2 CO2, K2
radiation and
Diffuse radiation.
How can solar energy be converted into electrical 2 CO2, K3
5. energy. Give a diagram showing the elements of
such a plant.
Describe the various methods of solar radiation 7 CO2, K5
measurement. How can we measure all (direct,
6. diffuse and global) radiations with the help of
Pyranometer? With the help of a neat diagram
explain the zenith angle and altitude angle in respect
of solar radiation analysis.
Distinguish between global radiation and diffuse 7 CO2, K5
7. radiation.
Describe the procedure for evaluating the
performance of a solar collector.
Classify different types of solar thermal collector and 7 CO2, K3

8. show the constructional details of a flat plate
collector. What are its main advantages?


9. Discuss the principle of a concentrating solar 7 CO2, K3
collector. How
it differs with flat plate collector?
How collector coating can be used to improve the 7 CO2, K4
10 performance of collector with reference to the flat
. plate collector? What is the concentrating ratio for
focusing collector?
11 Define Solar Air Heater with neat sketch and also 7 CO2, K2
. write its
Application?
12 Classify various energy storage systems. Describe 7 CO2, K2
. steam storage system for solar thermal energy.

, 13. Define Solar Air conditioning and Refrigeration 7 CO2, K2
System.
14. What is meant by solar pond? Describe the working 7 CO2, K3
of solar
power plant.

CO-Course Outcomes mapped with respective
question KL- Bloom's Knowledge Level
(K1,K2,K3,K4,K5,K6)
K1 – RememberK2 – UnderstandK3 – ApplyK4 – AnalyzeK5 – EvaluateK6– Create

, [Solution ref.: Assignment No. – 2]

Q.1- Define solar constant. What is its standard value?

A-1- Solar constant, the total radiation energy received from the Sun per unit of time per unit
of area on a theoretical surface perpendicular to the Sun’s rays and at Earth’s mean distance
from the Sun. The value of the constant is approximately 1.366 kilowatts per square metre.

Q.2- What is surface azimuth angle?

A-2- The solar azimuth angle is the azimuth angle of the Sun's position. This horizontal
coordinate defines the Sun's relative direction along the local horizon, whereas the solar zenith
angle defines the Sun's apparent altitude

i. It is defined as the horizontal angle between the projection of the normal to the horizontal
surface and the North-South line.

ii. Initially when the edge of the surface is aligned with East West line =0. When the edge of
the surface aligns with the edge of horizontal plane, PM’ rotates through 90∘
iii. In case we rotate the surface in the opposite direction, angle changes in the opposite
direction the value of V are ± 180∘




Q.3- On what factors does the collector efficiency of a solar flat plate collector depend?

A-3- The main parameters affecting the performance of solar collector are area, absorber
absorptivity and emissivity, emissivity of glass cover, temperature of absorber plate, collector
tilt angle and number of glass covers.


Q.4- Describe the difference between the Direct radiation and Diffuse radiation.

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