首页|Flow oscillation effects on the performance of a stepped solar still
Flow oscillation effects on the performance of a stepped solar still
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The rapid development of freshwater resources from renewable energy sources plays an important role in satisfying the modern life requirements. When it comes to the solar energy, one of the major issues is how to improve the performance and productivity of solar stills. In this respect, more attention is paid to the solar pump oscillating flow impact on the performance and how turbulence affects the freshwater productivity. This work investigates the impact of flow oscillation frequency, non-circular jets and porosity on the solar still productivity and expresses the functional form which relates the productivity, Prandtl number; Reynolds number and the solar intensity. An innovative design comprising a pyramid stepped solar still and a solar pump is combined with solar concentrators. It was found that the flow oscillation caused water depth fluctuation thus minimizing the thermal inertia, while metallic porous structures enhanced the evaporation rates. The water jet inertia affected the turbulence largest scale. Employing a flow oscillation frequency of 1.4 Hz increased the turbulent kinetic energy to 12.5 m~2/s~2. The freshwater productivity reached 7.2 L/m~2.day at an optimum porosity of 0.6. A squared water jet was found to be superior whereby the productivity became 8.4 L/m~2 day. A copper helical absorber with a pitch/coil diameter ratio of 0.5 and a black paint maximized the productivity to 10.8 L/m~2 day.
Flow oscillationstepped solar still
A. E. Hussin、M. M. Kamal、W. A. Aboelsoud、A. M. Hamed
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Mechanical Power Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt
NETL
NSTL
Sage
