Presents the fundamentals of thermophotovoltaic(TPV) energy conversion suitable for an upper undergraduate or first year graduate course. This textbook. Fundamentals of. THERMOPHOTOVOLTAIC. ENERGY. CONVERSION. Donald L. Chubb. NASA Glenn Research Center. Brookpark Road, MS Fundamentals of Thermophotovoltaic Energy Conversion von Donald Chubb ( ISBN ) online kaufen | Sofort-Download –

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Haben Sie eine Frage zum Produkt? Since TPV is a direct energy conversion process, the only moving parts in convesion system are fans or pumps that may be used for cooling the PV cells. The greater magnitudes for the planar emitter occur because thermal conduction exists for the planar emitter but does not exist for the cylindrical emitter.

So far only the thermophotovolfaic relation for plane waves and resulting relationships between the wave vector, kindex of refraction, n, and dielectric constant H r have been discussed. In the range 0.

In that case F0—OT is given by an approximate algebraic expression problem 1. Consider a surface that is emitting into a vacuum as shown in Figure 1. In the one-dimensional model it is assumed that the intensities are uniform over the surface area, A. The absorptance does not reach. These programs are contained on a CD-Rom disk included with the book. The Fresnel formulae relate the refracted and reflected fields to the incident field.

Thus the term diffuse means that reflectivity, reflectance, tranmissivity, transmittance, as well as, emittance and absorptance are independent of angle.

The 38 Chapter 1 spatial dependence of intensity is governed by a differential equation known as the equation of transfer or radiation transfer equation.

This compares to the opposite, undesirable result of small reflectance for the long thermophoovoltaic of the filter in Figure 4. An imaginary part to fumdamentals index of refraction accounts for absorption of radiation. Therefore, for a diffuse-gray surface the following applies.

These results are shown in Figure 4. The reflection coefficient rp given in equation 1. By adding a selective emitter or thermal emitter plus filter, the solar spectrum, which corresponds approximately to a K gray body emitter, can be shifted to match the bandgap energy of the PV cells.

### Fundamentals of Thermophotovoltaic Energy Conversion – PDF Free Download

Bitte geben Sie Daten ein: A fortuitous advantage of using alumina as the antireflective film is that it also can act as a barrier between the atmosphere and the tungsten emitter. The spatial and time variations all G enter in the exponential term. Also appearing in equation 3.

It is assumed that i is independent of the azimuthal angle, I. An Introduction to Quantum Physics. Now consider the thermkphotovoltaic where media 1 in Figure 1.

The intensity is the time average of the Poynting vector and is given by equation 1. Broman, Process in Photovoltaics: With the capability of hour-a-day operation, STPV is viable for electric utility use. Combustion driven TPV has many potential commercial applications.

These values of nsR and nsI are representative of platinum in the near infrared region of the spectrum [20]. For a planar emitter it is the substrate temperature. A numerical solution procedure is presented in Appendix B. Durability will be determined by the chemical stability and evaporation rate of the emitter material at high temperature.

Thus, in a medium with negligible scattering the two extinction coefficients are related by the following expression. Interference of plane waves can be demonstrated in the following manner. Thus, the P integrations in equation 3.

### Fundamentals of Thermophotovoltaic Energy Conversion

Under these conditions, the following result is obtained from equation 2. In other words, on the incident side of the interface, it is the sum of the incident wave and reflected wave electric fields.

In Chapter 4, where interference filters are discussed, the theory for an antireflection film is presented. In that case however, the G definition for k given by equation 1.

Although there appears to be unlimited potential TPV applications, whether or not they are feasible, will depend upon their cost. This is a rather large absorption coefficient for a non-conducting material.

## Fundamentals of Thermophotovoltaic Energy Conversion

I owe special thanks to two people: For up d 0. Fuhdamentals matrix equation [equation 4. This page intentionally left blank Chapter 4 Optical Filters for Thermophotovoltaics As pointed out in Chapter 2, spectral control is a major factor in attaining high efficiency for a TPV energy converter.

Therefore, the boundary conditions on E and H are the following. It is the sum of the absorption coefficient, a, and the scattering coefficient, Vs.