Category: SOLAR ENERGY 3

The chimney

A chimney relies on an energy source to heat air which rises via a buoy­ancy effect. The analysis is relatively simple and requires use of the Bernoulli equation which comes from the fluid mechanics literature. The Bernoulli equation is valid along the path that a fluid (in our case Solar Energy, An Introduction, First Edition, […]

The solar chimney and tower

The Sun can supply radiation to a photovoltaic device, as described in the previous chapter, to provide electricity for residential or indus­trial use. This technology is quite effective and useful. Here, heating of air with solar radiation in a chimney is initially considered to draw it through a building for a cooling effect. This is […]

Current-voltage relation

Before discussing the current-voltage relation, a discussion is given to clarify why a photovoltaic device is operated under forward bias again, knowing the details discussed above. At first forward bias operation seems contradictory; reference to Fig. 6.8 shows that when the excited electron is formed in the n-doped region the resulting hole is swept over […]

The photovoltaic device

A brief introduction to the physics dictating how a photovoltaic device or solar cell works is presented. This is truly a cursory introduction as we skirt around the details of semiconductor physics, yet, is a required exercise. The reader can then appreciate that a typical photovoltaic device is made from a p-n junction, defined below, […]

Generation of heat

Heat generation comes about by the material absorbing radiation for use in solar thermal applications. In this case, rather than producing electricity as would occur in a photovoltaic device, the electron and hole recombine to form heat. Heat is produced by the electrons losing energy to the surrounding crystalline matrix by inducing lattice vibrations to […]