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Universität Wien (2005)

Einfluss des Aerosols auf die diffuse Himmelsstrahlung

Sauerzopf, Hannes

Titre : Einfluss des Aerosols auf die diffuse Himmelsstrahlung

The aerosol’s influence on diffuse sky radiation

Auteur : Sauerzopf, Hannes

Akad. Grad : Dr. rer. nat. Wien, Univ., Diss., 2005

Université de soutenance : Universität Wien | Fakultät für Naturwissenschaften und Mathematik | Institut für Experimentalphysik

Résumé
The steadily increasing consumption of energy causes a lot of problems. The demand for energy goes hand in hand with the decrease of fossils fuels. Many scenarios predict a dry up of the oil stock in the next fifty to one hundred years. So this will force the scientists to focus their activities on the development of producing alter-native energy. One possibility is solar power because with good conditions of solar radiation about 1366Wm-2 of solar energy can be achieved. Thus both direct sunlight and diffuse sky radi-ance is used to produce solar energy. The sun’s rays cannot pass the atmosphere unhindered. The sunlight interacts with the molecules of the air. The blue colour of the sky and red sunsets are results of the scatter-ing properties of the molecules. Aerosols also contribute to the scattering of the sunlight. Aerosols are solid, air borne particles of the size of 0,1 to 50µm. The origins of these par-ticles differ. Natural sources like volcanic dust, sea salt minerals, desert sand and the influence of hu-man beings who have been burning fossil fuels have increased concentration of aerosols in the atmosphere. High concentrations of aerosols can be found in urban regions. These aerosols decrease the penetration of the sunlight through the atmosphere. Solar energy is used directly at the user’s location for heating and the production of elec-tricity because of the problems, caused by the transport of the energy produced in central power plants. The influence of aerosols is predominant in urban regions. In this theses the influences on diffuse sky radiation is examined and an estimation of power loss for decentralized solar power station is given using a radiation transfer pro-gram named SBDART (described in chapter 4) and the results are discussed in chapters 5 and 6. The input parameters for SBDART derive from measurements carried out directly in urban regions. The advantage of this method is that instead of global parameters local influ-ences have an effect on the model calculations. The results of the measurements are shown partially in chapter 3.2. The data have been collected using improved methods of measurement and the resulting advantages of these developments are described in chapter 8.

Mots clé : Strahlungstransfer / SBDART / Aerosol / diffuse Himmelsstrahlung / Sonnenernergie — radiative transfer / SBDART / aerosols / diffuse sky radiation / solar energy

Présentation : Österreichische Dissertationsdatenbank

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