Evaluation of the magnetic field effect on stepped solar still efficiency
Subject Areas : Fluid Mechanicshamidreza goshayeshi 1 , kimya samadi 2 , vahid nejati 3 , Reza Saleh 4 , Isaa Chaer 5
1 - Department of mechanical engineering, mashhad branch, azad university. mashhad,iran
2 - Department of Mechanics, Faculty of engineering, Islamic azad university,Mashhad,Iran
3 - دانشگاه آزاد اسلامی مشهد
4 - Associate Professor, Mashhad Branch, Islamic Azad University, IRAN
5 - 2The School of Built Environment and Architecture, London South Bank University, SE1 0AA, London, United Kingdom
Keywords: Solar Still, Magnetic Field, Solenoid, Computational fluid dynamics method, efficiency, NI,
Abstract :
This study focuses on improving the performance of a stepped solar still by investigating the effect of a magnetic field applied by a solenoid using a numerical solution method and experimental work. The calculations and experimental work in this study are based on a stepped solar still with seven steps. The effects of the applied magnetic field generated by the solenoid are investigated in terms of flow streamlines, contour plots of x-velocity and y-velocity, both in ignoring and considering the influence of magnetic field intensity. Two different combinations of NI (N is the number of solenoid turns, and I is the electric current intensity) are examined with values of 2.5 × 105and 10 × 105.In experimental work to increase the daily production rate of fresh water, the stepped solar still has been tested and optimized in various configurations including 1) Simple configuration, 2) utilizing a solenoid with turns of 275 3) utilizing a solenoid with turns of 1000.In computational fluid dynamics method, for the applied magnetic field with NI = 10 × 105,it has been observed that the evaporation rate reaches its maximum value in all stages of the solar desalination water slide, resulting in an increased water evaporation rate in the solar still. The evaporation rate has approximately reached the maximum value of 1.02 × 10−1 (kg/s) in all parts of the solar still. In experimental work the solar still's efficiency from 55.2% in mode 1 has reached 72.9%,74.3%.
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