Can renewable energy power the world?
Can renewable energy power the world?

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Can renewable energy power the world?

Week 2: Solar energy for heating and daylighting

Introduction

This week you will look at some of the methods employed to gather and use the Sun’s thermal (i.e. heat) energy. You will also look briefly at the role of the Sun’s light in reducing the need for artificial lighting in buildings.

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Transcript

Hello. This week we look at the use of the Sun’s energy in buildings for space heating, water heating and lighting. Only a small proportion of the Sun’s energy is intercepted by the Earth 150 million kilometres away. But it’s sufficient to keep the temperature of the planet suitable for life.

We also look at the variations and the amounts of solar energy intercepted in different seasons and regions of the globe. And we look at the design of buildings to make maximum use of solar energy for space heating and lighting passively without the need for special collectors and this building gives a very good example.

We then look at active solar collectors such as the rooftop solar water heaters that are common in many parts of the world. We go on to examine heat pumps which use electricity to raise to a useful temperature the ambience of energy that’s available from the air, from the ground or from water.

Finally, we look at concentrating solar power systems or CSP for short in which the Sun’s rays are concentrated using mirrors or lenses to generate high temperature steam that’s used to power electricity generators.

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