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A Comparison of the Environmental Impact of Solar Power Generation Using Multicrystalline Silicon and Thin Film of Amorphous Silicon Solar Cells: Case Study in Thailand

Khaenson W., Maneewan S., Punlek C.

Journal of Ecological Engineering

2017

Vol. 18, nr 4

1--14

This paper studies the environmental impact of two different forms of solar power generation in Thailand – that of multicrystalline silicon solar cells, and that of thin film amorphous silicon solar cells. It takes as its study two of the largest solar cell power plants of their kind in Thailand; a multicrystalline silicon plant in the north (generating 90 MW) and a thin film amorphous silicon plant in the centre (generating 55 MW). The Life Cycle Assessment tool (LCA) was used to assess the environmental impact of each stage of the process, from the manufacture of the cells, through to their transportation, installation and eventual recycling. The functional unit of the study was the generation of 1 kWh of power transmitted and distributed by the Electricity Generating Authority of Thailand (EGAT) and Provincial Electricity Authority (PEA). The environmental impact results were calculated in terms of eco-points (Pt) per functional unit of 1 kWh. The characterised data for 1 kWh of solar power generation was then compared with data for 1 kWh of combined cycle and thermal power generation (both in Thailand), using the same set of characterisation factors. After analyzing the results, both forms of solar power energy generation were found to impact upon the studied categories of Human Health, Ecosystem Quality and Resource Depletion, whilst also highlighting the importance of the solar cell module recycling process in decreasing the overall environmental impact. When the two solar cell technologies were compared, the overall impact of the multicrystalline silicon solar cell was found to be higher than that of the thin film amorphous silicon solar cell. Furthermore, when assessing the overall impact against non-renewable power generating technologies such as combined cycle and thermal power generation, the thin film amorphous silicon solar cells were found to have the lowest environmental impact of all technologies studied.

Current-mode variable current gain first-order allpass filter employing CFTAs

Iamarejin A., Suwanjan P., Jaikla W., Maneewan S.

Przegląd Elektrotechniczny

2013

R. 89, nr 2a

238--241

In this study, a current-mode first order allpass filter using current follower transconductance amplifiers (CFTAs) is proposed. The features of the circuit are that: the pole frequency, phase response and current gain can be electronically controlled via the input bias current: the circuit description is very simple, consisting of 2 CFTAs, 1 resistor and 1 grounded capacitor, without any component matching requirements. Consequently, the proposed circuit is very appropriate to further develop into an integrated circuit. Low input and high output impedances of the proposed configuration enable the circuit to be cascaded in current-mode without additional current buffers. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation.

W artykule przedstawiono przesuwnik fazowy prądowy pierwszego rzędu, wykorzystujący wzmacniacz CFTA. Do właściwości układu należy możliwość kontroli częstotliwości biegunowej, odpowiedzi fazowej i wzmocnienia prądowego przy pomocy wejściowego prądu stałego. Obwód składa się z dwóch układów CFTA, rezystora i uziemionego kondensatora. Przedstawione wyniki symulacyjne z programu PSpice potwierdzają skuteczność działania układu.