THIS CHAPTER INTRODUCES SOLAR radiation. Solar radiation is a
universal energy source supplied by sunshine to all life on Earth. This
chapter describes the concepts of irradiance, irradiation, direct versus dif-
fuse radiation, peak sun hours, and insolation. You will also learn about
the nature of light.
This chapter also investigates the relationship between the sun and the
Earth. This relationship is something that everyone experiences daily,
without fully understanding it. Major topics discussed in this chapter
include the angle of the sun, day length measurements, the scattering of
radiation, and absorption. Lastly, you will learn how these factors affect
PV design and installation.
Our Solar Resource
2
Topics & Concepts
This chapter covers the following topics and concepts:
What is solar radiation
The nature of light
The relationship between the sun and the Earth
21
chapter

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