Energy and life cost analysis of a wet wall solar still with various pump working conditions
Environmental Progress & Sustainable Energy, 2016
In this study, a basin type solar still is investigated whose enclosure walls are soaked with a p... more In this study, a basin type solar still is investigated whose enclosure walls are soaked with a periodic injection. The equipment was tested under the climatic conditions in Semnan, Iran. Two enclosures were manufactured for this purpose. One of them enjoyed a pump to soak the enclosure walls, while the other one was a conventional system with no such pump. In active chamber, effects of pump's working and off durations were investigated before being compared with those of a passive one. The results showed that the efficiency could be enhanced 7% and the rate of output fresh water could be increased ∼75% with the wet walls. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 532–538, 2017
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Papers by Ali Heydary
Thus, 2D unsteady compressible flow around a pitching airfoil is analyzed by means of coarse grid CFD (CGCFD) method and spring
dynamic grids network. At first to validate the code for moving boundary cases, the predicted lift coefficient of pitching airfoil is compared
with experiments. Simultaneously, the CGCFD results are compared with the RANS simulation. Then UFSI is added to the pitching
airfoil. The effects of unsteady parameters such as the inflation amplitude and phase difference between pitching and inflation is investigated
on lift and pressure coefficients of pitching airfoil. According to the results, UFSI, with zero degree phase difference between
pitching and inflation, help to postpone the dynamic stall.
of attack, oscillation amplitude, reduced frequency, and pitching axis position, on the
aerodynamic coefficients of a pitching airfoil are studied. This investigation is implemented
for high Reynolds number
flows around a dynamic stall condition. The employed numerical
method is a Coarse Grid CFD (CGCFD) method, in which the Euler equations are solved
using a coarse grid with no slip boundary conditions, and a compressible surface vorticity
confinement technique. The required computational time for this method is signifficantly
lower compared to that of the full Navier-Stokes equations with a simple one-equation
turbulence model. In addition, a multi zone adaptive spring grid network is applied to
simulate the moving boundary, which further reduces the computational time. Using
the described numerical setup separates the current work from the others. The obtained
numerical predictions are in very good agreement with experimental data for the high
Reynolds number
ow. It is found that moving the pitching axis position to the right or
left outside, and distancing it from the trailing edge or leading edge, has an inverse effect
on aerodynamic characteristics. Furthermore, increasing reduced frequency results in a
reduction in the lift hysteresis loop slope, and in the maximum lift and drag coefficients.