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Empirical Models for the Correlation of Metrological Data for Tikrit-TuzKhurmato and Kirkuk-IRAQ

نموذج رياضي تصحيحي لمعطيات الظروف الميترولوجيا لمناطق تكريت,طوز خورماتو وكركوك العراق.

Fayadh M. Abed Al-Dulaimy Ghazi-Yousif Mohammed Al-Shahery

Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية
ISSN: 1813162X 23127589 Year: 2012 Volume: 19 Issue: 1 Pages: 1-13
Publisher: Tikrit University جامعة تكريت

Abstract

Measurements of metrological data of maximum, minimum ambient temperature, humidity and sunshine duration for a period of 23 years during the period of 1977-2000, at Tikrit (34. 35°N, 43.37°E), TuzKurmato (34.88°N, 44.64°E), and Kirkuk (35.30°N, 44. 21°E) were used to establish an Angstrom type correlation equations for direct global solar radiation. The diffuse radiation was estimated by using Klien and Page Models. This calculation appears to be sufficient to discriminate each station from the others due to it’s local characteristic of the sites. The overall results shown for TuzKurmato, the received radiation on the plane surface is higher than Tikrit and Kirkuk while the diffuse radiation reversely behaved as for Tiktit is the highest. The developed model can be used for estimating global solar radiation on horizontal surfaces. The monthly average total solar radiation was estimated. The value of correlation coefficient (r) and value of Root Mean Square Error (RMSE), Mean Bias Error (MBE) and Mean Percentage Error (MPE) were determined for each equation

Keywords

Solar global radiation --- Hargreaves equation --- temperature --- relative sunshine duration