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    A study on microwave assisted drying characteristics of red pepper
    (ACADEMIC JOURNALS, 2011) Yelmen, Bekir; Ustuner, Tamer; Ustuner, Menderes
    The method of drying red pepper by means of a combination of convectional oven plus microwave was investigated in this study. Red pepper was dried using hot air, microwave and a combination of microwave plus hot air. Therefore, some factors such as drying time, ratio of drying, changes in color, drying using microwave power settings above levels of energy consumption, drying by microwave power and hot air drying, only hot air drying, etc. were inspected for red pepper during relevant study. The models of Wang and Singh; Page; Improved Page; Henderson and Pabis; Newton; Logaritmical; Diffusion Approach; Verma; Exponential with Two-Terms; Simplified Fick Diffusion; Midilli; and Kucuk were compared so that moisture content for drying times of products could be determined in a given time by means of a laboratory dryer with microwave feature. The performances of aforesaid models were compared according to the determination coefficient (R-2), standard error of estimate (SEE) and residual sum of squares (RSS). It was found that the models of Midilli and Kucuk expressed the drying attitude of products better than the others.
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    Determining the potential of solar energy and benefiting from this potential using photovoltaic system in Turkey
    (SILA SCIENCE, 2011) Yelmen, Bekir; Ustuner, Tamer; Ustuner, Menderes
    Today, renewable energy sources which are important substitutes for fossil-based energy sources can be converted into electrical energy using some effective recycle processes. Although Turkey is a country with rather high potential for solar energy, it has yet facilities well below of required practicability levels when it is compared to the instances in the world. In this study, the potential for solar energy in Turkey was identified; it was investigated how that potential was assessed; and the methods and ways to obtain electrical energy from photovoltaic systems using the aforesaid potential in the cities located on referenced latitudes of Turkey. As a conclusion, it was determined that the potential for electrical energy which could be obtained from solar energy was higher in our cities located on Southern latitudes than in other cities.