Günlük toplam güneş ışınımının aylık ortalamasına ilişkin korelasyon faktörü kıyaslama ve yeni model çalışması

Energy demand led to solar energy and installing photovoltaic facilities become the mainstream power supplier today. Solar energy has become a trending topic not only for scientific researches but also for the governments and companies as well. Therefore, there have been conferences, meetings with regard to improvements of solar technology and science behind, meanwhile anaylsing the yearly situation of solar technology in terms of economic, legal and governmental aspects. However, there are some obstacles for investors that can not be ignored. The most important ones are installment costs and legal regulations. This situation force investors to do the right project before installation. Thereto, building solar plants with suitable setup to the correct geographic areas by utilizing information of solar radiation data is the start point of solar energy facility investment projects. In these premises several solar radiation models have been improved in order to estimate the solar radiation at a given location or larger areas. One of the main objective of this thesis is to review the solar radiation models available in the literature and evaluate for the defined regions and related stations in Turkey in order to develop new models. Therefore, this Master of Science Thesis aims to compares the models for several stations in four regions where the total solar radiation range varies by region. Further, thesis also aims to imply the statistical analysis methods in order to detect the most appropriate model. In the first part of this thesis, the improvements in the solar energy field are explained for Turkey and World. Besides, the current status of solar energy installed capacities are explained with numbers due to the yearly reports that published around the world by governments and solar energy related societies. Furthermore, literature reviewed in this thesis with regard to the models proposed to determine global solar radiation datas for specific or general regions. The studies published for the models, are detailed in the literature part of the first chapter. The investigation for solar plant installations has to be done scientifically for to define the most appropriate facility. Therefore, the physics of solar energy has major role. In this context, in the second chapter this thesis states, theorical knowledge of solar angular and radiation calculations. The descriptions of solar angles are detailed meanwhile the pathway of solar radiation through the atmosphere is explained. Besides the descriptions of physics of solar energy, the related fundamental equations of solar radiation are also defined. The daily extraterrestrial radiation fundamental equations are detailed meanwhile the daily solar radiation on horizontal surface is stated in this chapter that are within the topic of this thesis. Although the hourly fundamental calculations of solar radiation on horizontal and inclined surface are not the topic of this thesis, the global, direct and diffuse solar radiation are also detailed for the knowledge of the physics of solar radiation fundamentals. Further, in the third chapter, experimental study is explained by the description of the region and the global solar radiation calculation by models selected from the literature. The models that are evaluated in the literature are chosen which the studies enlightens as some station(s) within Turkey region. The third chapter summarize briefly the models and the studies that the models are purposed. Furthermore, the chapter defines the field that the thesis evolved. This thesis, includes Turkey region with four different solar radiation ranges which are named under regions. There are 5 stations for each region that are evaluated under the selected models. In the fourth chapter, calculations are detailed and 4 regions each 5 stations illustrated. Each station evaluated for selected models which are grouped by 6 sets of models. On the other hand, models are evaluated for each station of each region, but only Istanbul and one selected station for each region are illustrated by the model results figures. Further, statistical analysis results are shown for regions. By the end of fourth chapter, new models purposed by this Master of Science Thesis is given for selected stations and Istanbul, Turkey according to the measured and calculated data of the monthly average daily global radiation and the monthly average maximum possible daily sunshine duration. In the conclution, the importance of solar energy is stated and the improvements around the world are evaluated by means of report datas. Furthermore, forecasts are given for the improvents of solar energy field. In the following, the models are compared by the statistical analysis results of each selected station. At the end, the purposed models by this thesis are evaluated by the statistical analysis methods.