Daneshyar model

Various prediction methods for calculating the mean monthly solar radiation parameters are examined. A suitable method is proposed for predicting the mean monthly values of direct, diffuse, and total solar radiation at different locations in Iran.

solar energydiffuse solar radiationcalculation methodsexperimental datadirect solar radiation

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Initial contribute: 2021-09-06

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Quoted from:Daneshyar M . Solar radiation statistics for Iran[J]. Solar Energy, 1978, 21:4(4):345-349.

https://www.sci-hub.ren/10.1016/0038-092x(78)90013-0

Various prediction methods for calculating the mean monthly solar radiation parameters are examined. A suitable method is proposed for predicting the mean monthly values of direct, diffuse, and total solar radiation at different locations in Iran. This method is based on the assumption that the direct and diffuse components of solar radiation are primarily functions of solar zenith angle and cloud cover. 

In this method the instantaneous values of direct and diffuse components of solar radiation were first calculated and then used in order to compute the mean monthly radiation parameters. 

 

Following Paltridge and Proctor’s work, Daneshyar proposed his method by defifining new coeffificients for diffuse radiation adjusted for the climate conditions of Tehran, Iran :

The hourly beam and diffuse radiation is calculated from following equations:

\( 𝐼_𝑏=3.42286[1−exp⁡(−0.075(90−𝜃))] \)

\( 𝐼_𝑑=0.00515+0.00758(90−𝜃)+0.43677CF \)

 

The mean monthly total radiation in (MJ/m 2day) estimated, using time steps of 15 min, is:
\( 𝐻=(1−CF)∫_"sunrise " ^"sunset " 𝐼_b (𝜃)cos⁡𝜃𝑑𝑡+∫_"sunrise " ^"sunset " 𝐼_d (𝜃)𝑑𝑡 \)

 

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M.DANESHYAR (2021). Daneshyar model, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/f5886696-b76e-482e-a90d-f691a5a1aa8d
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Initial contribute : 2021-09-06

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