Szukana fraza: [Abstrakt = "Occurring in the literature isotropic, anisotropic or pseudoisotropic mathematical models allow to determine the power density of solar radiation basing on the different, often not very detailed or even incomplete measurement sequences. Complex measurement stand and difficulties in conducting experiments at any latitude make it necessary to estimate that value and the accuracy of the results determines the validity of their application in different geographical locations. The aim of the study is to analyze the effectiveness of the Hargreaves – Samani model in estimating global solar radiation for the local climatic conditions \(Poznań, 52°25’ N, 16°56’ E\). The input data in the model are the maximum and minimum daily air temperature obtained from the meteorological station located in the city of Poznań. The analyzed model describes the value of the RMS and MBE error at the level of 12,54 % and – 7,85 % which indicates the possibility of its use for selected periods of the year."]

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