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    An Experimental Study on Solar Energy Storage
    (Urednistvo Casopisa Strojartvo, 2007) Can, Ahmet; Karacavus, Berrin; Buyruk, Ertan
    Using solar energy for heating of buildings or Supplying hot water when needed by storing solar energy under ground was investigated experimentally. For this aim, a heating system was built to store solar energy in cylindrical water tank placed under ground via solar collector. In the present study it is obtained that energy saving was seen remarkably in Edirne in Turkey (41 degrees 39 ' 54 '' N) by storing solar energy to use it at other time considering that it would balance difference between consuming and generating energies. During the experimental study, temperature of heat storage unit and surrounding under ground were Measured. In the season of heat storage, efficiency of heat storage unit of cylindrical tank was obtained as 86-96% and it was determined that 89-100%, of total heat was obtained from the sun.
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    Numerical Study of Heat Transfer Characteristics of Extended Surfaces
    (Urednistvo Casopisa Strojartvo, 2007) Kaya, Derya; Buyruk, Ertan; Can, Ahmet; Fertelli, Ahmet
    In the present Study, effects on beat transfer of different type of extended surface placed oil a flat plate oil two dimensional rectangular cross-sections are investigated with conjugated heat transfer approach. Surface and air inlet temperature were fixed for the condition of turbulent flow. Effect of Reynolds number on heat transfer coefficient was investigated for triangular rib g geometry. Three type of extended surface geometries were used which are circular, rectangular and triangular in the present study. For these geometries, temperature Contours and local Nusselt number were obtained for Re = 500. Triangular extended geometry with groove was also investigated and temperature contour and local Nusselt number were shown.