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Off-grid street lamp design.
Hampl, Petr ; Karásek, David (oponent) ; Křenek, Ladislav (vedoucí práce)
The problem area of the project depicts the issue of actual transformation of energy resources and supply worldwide with the focus on renewable resources of energy. The stress is primarily laid on values of an object designated for public spaces. The author’s assignment was to design a lighting unit independent of an external power supply. The aim of the new design is to rethink the way in which technologies utilizing solar and wind power are commonly used, and to suggest a solution that brings new features, benefits and values for the user and society. Generally the author brings forward design that reflects actual global threats and opportunities. The result is a design of a street lamp that combines a wind turbine with a solar cell module in order to gain electrical energy which is stored in an accumulator and afterwards supplied to a luminaire. The lamp is designed with special consideration of aesthetics and ergonomics. The designed solution brings financial benefits in terms of saving the nonrenewable resources and possible money savings for the investor. Furthermore, the off-grid street lamp has a lower negative impact on the environment and demonstrates technologies utilizing solar and wind power in a friendly and unintrusive way.
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Chalcopyrite Solar Cells
Škvarenina, Ľubomír
Thin-film chalcopyrite based Cu(In;Ga)Se2 solar cells with a metal wrap through interconnection were investigated by non-destructive methods in our research. The primary focus of this investigation was a detection and a localization of microstructural defects in this type of Cu(In;Ga)Se2 solar cells. A combination of a visible and near infrared electroluminescence with a lock-in thermography was used for these purposes. Mainly the electroluminescence was a very sensitive tool for an indication of pre-breakdown sites influenced by a trap-assisted tunneling or stress-induced leakage currents. A strong correlation between electroluminescence maps and lock-in thermograms was obtained after a local breakdown accompanied by a creation of permanent defect.
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Dark J–V Characteristics Model Of
Chalcopyrite-Based Solar Cells
Škvarenina, L’ubomír
An equivalent circuit model of the current parasitic pathways is proposed to describe a behaviour of dark current density–voltage characteristics of chalcopyrite-based solar cells in order to understand a shunting behaviour between the ZnO:Al/i-ZnO/CdS/Cu(In;Ga)Se2/MoSe2/Mo/Ti/TiN layers. The model fitting with a parameter extraction is evaluated for the sample before and after an appearance of a permanent breakdown to prove an accurate response of the proposed model to an ohmic and non-ohmic component shift.
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Off-grid street lamp design.
Hampl, Petr ; Karásek, David (oponent) ; Křenek, Ladislav (vedoucí práce)
The problem area of the project depicts the issue of actual transformation of energy resources and supply worldwide with the focus on renewable resources of energy. The stress is primarily laid on values of an object designated for public spaces. The author’s assignment was to design a lighting unit independent of an external power supply. The aim of the new design is to rethink the way in which technologies utilizing solar and wind power are commonly used, and to suggest a solution that brings new features, benefits and values for the user and society. Generally the author brings forward design that reflects actual global threats and opportunities. The result is a design of a street lamp that combines a wind turbine with a solar cell module in order to gain electrical energy which is stored in an accumulator and afterwards supplied to a luminaire. The lamp is designed with special consideration of aesthetics and ergonomics. The designed solution brings financial benefits in terms of saving the nonrenewable resources and possible money savings for the investor. Furthermore, the off-grid street lamp has a lower negative impact on the environment and demonstrates technologies utilizing solar and wind power in a friendly and unintrusive way.
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