LOW COST AUTOMATIC SUN PATH TRACKING SYSTEM

Solar tracking systems used are to increase the efficiency of the solar cells have attracted the attention of researchers recently due to the fact that the attention has been directed to the renewable energy sources. Solar tracking systems are of two types, Maximum Power Point Tracking (MPPT) and sun path tracking. Both types are studied briefly in this paper and a simple low cost sun path tracking system is designed using simple commercially available component. Measurements have been made for comparison between fixed and tracking system. The results have shown that the tracking system is effective in the sense of relatively high output power increase and low cost

Desenvolvimento de um sistema de seguimento solar para aplicação em medição de aerossóis atmosféricos

Os aerossóis são pequenas partículas no estado sólido ou líquido, suspensas na atmosfera, exercendo uma influência importante sobre o clima e o ambiente. Assim afetam o clima: através da difusão, transmissão e absorção tanto da radiação proveniente do Sol como da radiação térmica proveniente da superfície terrestre; através da intensificação ou moderação do efeito dos gases de estufa; agindo como núcleos formadores de nuvens, influenciando consequentemente o ciclo de vida destas e do ciclo hidrológico do planeta Terra. Uma consequência da presença deste tipo de partículas, suspensas em grande quantidade na atmosfera, reside na degradação da qualidade do ar. […]Aerosols are small particles in the solid or liquid state, suspended in the atmosphere, exerting a significant influence on the climate and in the environment. Thus they affect the climate: through the dispersion, transmission and absorption of both radiation from the Sun and from the thermal radiation from the Earth’s surface; through intensification or moderation of the greenhouse effect; acting as cloud forming nuclei, consequently influencing their life cycle and the hydrological cycle of planet Earth. A consequence of the presence of this type of particles, suspended in great quantity in the atmosphere, resides in the degradation of the quality of the air. […