scholarly journals Monthly average daily global and diffuse solar radiation based on sunshine duration and clearness index for Brasov, Romania

2014 ◽  
Vol 6 (5) ◽  
pp. 053106 ◽  
Author(s):  
Daniel Tudor Cotfas ◽  
Petru Adrian Cotfas ◽  
Eleni Kaplani ◽  
Cornel Samoila
Keyword(s):  
Solar Radiation ◽  
Sunshine Duration ◽  
Clearness Index ◽  
Diffuse Solar Radiation ◽  
Monthly Average

Estimation of Diffuse Solar Radiation from Clearness Index for Multan, Southern Punjab, Pakistan

2016 ◽  
Vol 12 ◽  
pp. 441-444
Author(s):  
M. Tanweer ◽  
◽  
Firoz Ahmad ◽  
Zaheer Uddin ◽  
Saif Rehman ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Clearness Index ◽  
Diffuse Solar Radiation

Frequency Distributions for Hourly and Daily Clearness Indices

2001 ◽  
Vol 124 (1) ◽  
pp. 28-33 ◽  
Author(s):  
Manuel Iban˜ez ◽  
William A. Beckman ◽  
Sanford A. Klein
Keyword(s):  
Solar Radiation ◽  
Recent Literature ◽  
Weather Data ◽  
Clearness Index ◽  
Frequency Distributions ◽  
Monthly Average ◽  
Daily Frequency ◽  
Better Than ◽  
Exponential Probability

The clearness index for hourly and daily radiation is an important parameter in describing solar radiation. Liu and Jordan demonstrated that the monthly average daily clearness index could be used to predict the long-term distribution of daily solar radiation in a month. This paper reviews recent literature on the prediction of hourly and daily frequency distributions and cumulative frequency distributions of clearness indices. Ten years of measured weather data for six cities in the U.S. are used to investigate the nature of the hourly and daily frequency distributions. A second set of ten years of data for six cities is used to verify the predictions. A bi-exponential probability density function is proposed that fits the observed bimodal nature of the data better than existing models. A case is made for the function being universal.

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