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Variation over Time of the Perez Calibration Algorithm for Ground-Based Spectrometer

100%
Chin S., Boyou N., Yusoff R., Hamid A., Dayou F.
Acta Physica Polonica A
|
2016
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vol. 130
|
issue 1
160-162
EN
A spectrometer is likely to perform as expected over a period of time if calibrated with suitable method. This paper aims to study the variation of the Perez calibration algorithm over time for a spectrometer. The study was carried out for six months from July to August 2012 and January-April 2013. The measurements were recorded for every minute interval from 8.30 a.m. to 4.30 p.m. in three locations in Kota Kinabalu, Sabah, Malaysia. Monthly calibration constants for eight wavelengths were determined for the Perez model using improved Langley method. When only wavelengths which are close to 500 nm (460, 500, 540, 580, and 620 nm) were engaged, the variations over time of the Perez calibration constants were consistent over time (F=1.381, p= 0.273). This is similar to the previous finding on the Du Mortier algorithm.
2
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Utilization of The Collector Two Colored Rainbow System in Istanbul

80%
Er Z.
Acta Physica Polonica A
|
2015
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vol. 128
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issue 2B
B-300-B-302
EN
Solar heating is known as one of the cleanest and cost-effective technologies that inherently reduces cost of energy and dependency on imported fuels while being applied and used in commercial and product applications in the industry. The modus operandi of this study introduces a procedure that was coined as "Two Colored Rainbow" which is used to represent two different applications using by solar tracer, rather than the direct application of solar thermal system. Two rainbow system traps the heat from the sun (solar radiation) and transfer the heat to water or to air for use as thermal energy by the aid of solar panels that the system is coupled with solar tracer. The vacuum tube and flat type collectors were used as an experimental portion of this study while the effective utilization of solar energy on a daily basis has been identified by the algorithm that has been developed in C# to determine how many percentage of an hotel's energy in Istanbul which serves up to five hundred guest capacity need could be compensated by providing optimum size and quantity of solar collectors.
3
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A Study of Importance of Solar Calculations for "Two Colored Rainbow System" in Istanbul

80%
Er Z.
Acta Physica Polonica A
|
2015
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vol. 128
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issue 2B
B-477-B-478
EN
The sun radiation is the largest renewable energy source on the planet which can be used in technology by means of thermal, photovoltaic and concentrated solar power systems. In this study, two types of solar collectors, called the "Two Colored Rainbow System", were used as a source for water heating at the Faculty of Science and Letters, at Istanbul Technical University. The performance of solar water heating system was experimentally investigated. In the experimental study, the temperature of hot water storage tank versus time of the day was investigated. The average daily solar radiation at a location is often sufficient for a basic system analysis. The radiation of sun varies according to the location, date, time and conditions of climate. The change of sun radiation was computed using a determined set of parameters. This study was aimed to offer optimization of design parameters taking into account possible interferences during the operation of the system. Additionally, hourly solar radiation on tilted surfaces is measured in Istanbul. Data of solar radiation intensity were also collected using a standard solarimeter (pyrometer) via a data logger.
4
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Effect of Spectral Irradiance Distribution on the Performance of Solar Cells

70%
Guechi A., Chegaar M., Merabet A.
Acta Physica Polonica A
|
2011
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vol. 120
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issue 6A
A-43-A-46
EN
In this paper, the global and diffuse solar radiation incident on solar cells is simulated using a spectral model SMARTS2, for varying atmospheric conditions on the site of Setif. The effect of changes in total intensity and spectral distribution on the short circuit current and efficiency of different kinds of thin film solar cells (CdTe, nc-Si:H and copper indium gallium selenide, CIGS) is examined. The results show a reduction in the short circuit current due to increasing turbidity. It is 18.82%, 27.06% and 26.80% under global radiation and for CdTe, nanocrystalline silicon (nc-Si:H), and CIGS solar cells, respectively. However it increases under diffuse radiation. Increasing water vapor in the atmosphere leads to a reduction in the short circuit current of 3.15%, 2.38%, and 2.45%, respectively, for CdTe, nc-Si:H, and CIGS cells under global radiation and it is not influenced under diffuse radiation. The performance of the solar cells is notably reduced, both in terms of efficiency and open circuit voltage, with increasing air mass.
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