Purified drinking water is the basic need of human beings. Purification of water assisted by freely available solar energy can be the best alternative compared with other water purification techniques available in the market today which consume nonrenewable energy. Distillation, which is the most ancient method, is being used for water purification. The device in which solar thermal energy converts brackish water into pure drinkable form is known as a solar still. Present article reports an extensive study of numerous designs of solar stills. The article also includes a review of effect of each parameter that influences the water productivity that is, pure water.Considerations of thermodynamics, heat transfer, and mass transfer are also explained in brief. The reviews of various kinds of analysis namely, theoretical, experimental, computational, cost, and water quality have been reported.
Objectives: To design a blade profile suitable for a micro-capacity wind turbines. To analyze the performance of a new blade profile in terms of lift to drag ratio using simulation software such as QBlade and ANSYS Fluent CFD. Methods: A new airfoil for a micro capacity horizontal axis wind turbine is designed using QBlade software. A 3D model of the airfoil is prepared using CATIA. 2D and 3D CFD simulations of this airfoil are carried out using ANSYS Fluent and the simulation results are compared with those obtained from QBlade. Findings: It is found that QBlade results for the lift to drag ratio fairly match with the experimental results at all values of angles of attack (0 • to 20 • ). 3D CFD results also fairly match with experimental results at lower values of angles of attack (0 • to 3 • ). The optimum value of lift to drag ratio is obtained for the angle of attack of 3 • -4 • . 3D CFD simulation under predicts lift to drag ratio at higher angles of attack as compared to the experimental values. Novelty: The study reports simulation results for an airfoil blade profile of a micro-capacity wind turbine using both QBlade and ANSYS Fluent CFD (both 2D and 3D). The simulation results fairly match with the available experimental results.
Objectives:To perform computational studies on different combinations of plate fin arrays of different shapes for studying their performance in natural convection heat transfer. To compare the heat transfer performance of uniform notched fins with hybrid notched fins and also performance of normal notched fins with inverted notched fins. Methods: SolidWorks Flow Simulation software is used for the present computational studies. Three types of vertical plate fin arrays viz. plain rectangular fin, rectangular fin with square notch and rectangular fin with semi-circular notch are used with their seven combinations. These fin array combinations are: plain rectangular, rectangular square notched, rectangular semi-circular notched, rectangular inverted square notched, rectangular inverted semi-circular notched, hybrid rectangular square-semi-circular notched and hybrid rectangular inverted square-semi-circular notched. Findings: The highest average heat transfer coefficient of 7.82 W/m 2 K is found to be for inverted hybrid square-semicircular notched fin array. This value of heat transfer coefficient is about 8% higher than compared to that with plain rectangular plate fin array (7.25 W/m 2 K) subjected to same operating conditions. Average heat transfer coefficients for inverted plate fin array combinations are high as compared with the non-inverted combinations. Also, hybrid plate fin arrays, whether inverted or not, show higher heat transfer coefficient values as compared with uniform notched fin arrays. Novelty : Seven types of plate fin array combinations are studied computationally. SolidWorks Flow Simulation software is used very effectively for this 3D CFD analysis. The behaviour of fluid i.e. air during natural convection flow is studied using air flow velocity trajectories. Surface contours are effectively used for studying variation in surface temperature and heat transfer coefficient at all locations of fin arrays.
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