HAKKINDA

  • ISSN: 2149-4916
  • E-ISSN: 2149-9373
  • Yayın Periyodu:
    Nisan - Ağustos - Aralık
  • Editör:İsmail ŞAHİN
  • Yıl: 2015
  • Cilt: 1
  • No: 1

COMPARISON OF THERMAL PERFORMANCES OF FIXED AND TRACKING SOLAR COLLECTORS WITH COMPUTATIONAL FLUID DYNAMICS

Selçuk KEÇEL, 

Solar collectors, one of the important areas of use for solar power, are based on the principle of heating water flowing through piping systems with solar radiation. Collectors are mostly fixed with various constructions on roofs of buildings, which provide hot water. Efficiency differences between fixed systems and tracking systems are generally compared over efficiencies of photovoltaic systems. As a different this study, the thermal analysis of solar collector systems to be installed on two systems, one being fixed and the other tracking system, with a surface area of 10m2, was made with Computational Fluid Dynamics Analyses (CFD). This study examines the operating efficiency of collectors equipped with eight 12mm diameter pipes located in connection to the main pipe of 2*25mm diameter on two models, which embody a 930*1930mm aluminum pipe. In the models, the flow rate of solar collectors was measured 20/60kg/h, inlet temperature of the water flowing through collectors was 40°C and outlet temperature was 50-70°C. Throughout the modeling process completed in two stages, solar charts were generated by obtaining temperature and radiation values on the surface of two systems located on the building roof for the city of Ankara between 08.00 and 18.00 on June 21 in the first stage. In the second stage, time dependent thermal analyses were made for eight collectors in total, which can be placed on a fixed and mobile system with a surface area of 10m2. These analyses allowed for the evaluation of efficiency, surface temperature, and tracking angle values of the collectors on an hourly basis on the fixed and mobile system. Therefore, the information flow will be provided to users to meet the requirements considering cost factors for the systems to be installed.

Anahtar Kelime: Efficieny of collector,  Solar Maps,  Computational Fluid Dynamics

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