کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7937592 | 1513099 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Variability of measured Global Horizontal Irradiation throughout Qatar
ترجمه فارسی عنوان
تغییر اندازه گیری افقی در قطر
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کلمات کلیدی
ارزیابی منابع خورشیدی، شاخص شفافیت، تنوع خورشیدی فصلی، توزیع فرکانس،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
This paper presents a study of up to six years of ground measurements of Global Horizontal Irradiation (GHI), the total solar radiation arriving on a horizontal surface, collected by 12 automatic weather stations throughout Qatar. The year-to-year and monthly variations of daily GHI are calculated for each station; the average found is 5.80Â kWh/m2/day, a total of 2116Â kWh/m2/year. Spatially, the monthly averages through the country vary with a relative standard deviation of up to 4% with respect to the country averages; in general, higher GHI is found in the south and north regions of Qatar, except at the northern tip of the country, and lower values are found mainly in the central latitudes, close to the industrial areas. Frequency distributions of daily GHI present two peaks, which are found to correspond to two distinct periods of the year: one from March to September, with most frequent GHI values around 7Â kWh/m2/day, and one from October to February, centred around 4.5Â kWh/m2/day. A similar study can be advisable for other areas with comparable climate or topographies, since these two solar seasons might also be present and, if found, should be considered in the design and implementation of photovoltaic-based systems. Finally, the monthly clearness index (ratio of ground-level GHI to top-of-the-atmosphere GHI) is presented for each location and for Qatar as a whole from ground measurements and compared to longer-term satellite-based values. The annual average of clearness index for Qatar from ground measurements is 0.64, indicative of clear-sky conditions most of the year. GHI is the fuel of photovoltaic systems, so its study is fundamental for such applications, and also provides a reference for the derivation of solar radiation data from models or satellite observations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy - Volume 119, September 2015, Pages 169-178
Journal: Solar Energy - Volume 119, September 2015, Pages 169-178
نویسندگان
D. Perez-Astudillo, D. Bachour,